pgtable.h revision a53c8fab3f87c995c30ac226a03af95361243144
11da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 21da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * S390 version 3a53c8fab3f87c995c30ac226a03af95361243144Heiko Carstens * Copyright IBM Corp. 1999, 2000 41da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Author(s): Hartmut Penner (hp@de.ibm.com) 51da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Ulrich Weigand (weigand@de.ibm.com) 61da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Martin Schwidefsky (schwidefsky@de.ibm.com) 71da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 81da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Derived from "include/asm-i386/pgtable.h" 91da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifndef _ASM_S390_PGTABLE_H 121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define _ASM_S390_PGTABLE_H 131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * The Linux memory management assumes a three-level page table setup. For 161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * s390 31 bit we "fold" the mid level into the top-level page table, so 171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * that we physically have the same two-level page table as the s390 mmu 181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * expects in 31 bit mode. For s390 64 bit we use three of the five levels 191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * the hardware provides (region first and region second tables are not 201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * used). 211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * The "pgd_xxx()" functions are trivial for a folded two-level 231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * setup: the pgd is never bad, and a pmd always exists (as it's folded 241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * into the pgd entry) 251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * This file contains the functions and defines necessary to modify and use 271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * the S390 page table tree. 281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifndef __ASSEMBLY__ 309789db08c020193ae18826c3aa48bd24296f7848Heiko Carstens#include <linux/sched.h> 312dcea57ae19275451a756a2d5bf96b329487b0e0Heiko Carstens#include <linux/mm_types.h> 321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <asm/bug.h> 33b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky#include <asm/page.h> 341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsextern pgd_t swapper_pg_dir[] __attribute__ ((aligned (4096))); 361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsextern void paging_init(void); 372b67fc46061b2171fb8fbb55d1ac717abd533569Heiko Carstensextern void vmem_map_init(void); 3892f842eac7ee321c8a0749aba2513541b4ac226fMartin Schwidefskyextern void fault_init(void); 391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * The S390 doesn't have any external MMU info: the kernel page 421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * tables contain all the necessary information. 431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 444b3073e1c53a256275f1079c0fbfbe85883d9275Russell King#define update_mmu_cache(vma, address, ptep) do { } while (0) 451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 47238ec4efeee4461d5cff2ed3e5a15a3ab850959bMartin Schwidefsky * ZERO_PAGE is a global shared page that is always zero; used 481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * for zero-mapped memory areas etc.. 491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 50238ec4efeee4461d5cff2ed3e5a15a3ab850959bMartin Schwidefsky 51238ec4efeee4461d5cff2ed3e5a15a3ab850959bMartin Schwidefskyextern unsigned long empty_zero_page; 52238ec4efeee4461d5cff2ed3e5a15a3ab850959bMartin Schwidefskyextern unsigned long zero_page_mask; 53238ec4efeee4461d5cff2ed3e5a15a3ab850959bMartin Schwidefsky 54238ec4efeee4461d5cff2ed3e5a15a3ab850959bMartin Schwidefsky#define ZERO_PAGE(vaddr) \ 55238ec4efeee4461d5cff2ed3e5a15a3ab850959bMartin Schwidefsky (virt_to_page((void *)(empty_zero_page + \ 56238ec4efeee4461d5cff2ed3e5a15a3ab850959bMartin Schwidefsky (((unsigned long)(vaddr)) &zero_page_mask)))) 57238ec4efeee4461d5cff2ed3e5a15a3ab850959bMartin Schwidefsky 58238ec4efeee4461d5cff2ed3e5a15a3ab850959bMartin Schwidefsky#define is_zero_pfn is_zero_pfn 59238ec4efeee4461d5cff2ed3e5a15a3ab850959bMartin Schwidefskystatic inline int is_zero_pfn(unsigned long pfn) 60238ec4efeee4461d5cff2ed3e5a15a3ab850959bMartin Schwidefsky{ 61238ec4efeee4461d5cff2ed3e5a15a3ab850959bMartin Schwidefsky extern unsigned long zero_pfn; 62238ec4efeee4461d5cff2ed3e5a15a3ab850959bMartin Schwidefsky unsigned long offset_from_zero_pfn = pfn - zero_pfn; 63238ec4efeee4461d5cff2ed3e5a15a3ab850959bMartin Schwidefsky return offset_from_zero_pfn <= (zero_page_mask >> PAGE_SHIFT); 64238ec4efeee4461d5cff2ed3e5a15a3ab850959bMartin Schwidefsky} 65238ec4efeee4461d5cff2ed3e5a15a3ab850959bMartin Schwidefsky 66238ec4efeee4461d5cff2ed3e5a15a3ab850959bMartin Schwidefsky#define my_zero_pfn(addr) page_to_pfn(ZERO_PAGE(addr)) 67238ec4efeee4461d5cff2ed3e5a15a3ab850959bMartin Schwidefsky 681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif /* !__ASSEMBLY__ */ 691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * PMD_SHIFT determines the size of the area a second-level page 721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * table can map 731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * PGDIR_SHIFT determines what a third-level page table entry can map 741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 75f4815ac6c935b8e441fe12504d62e0e8ff7f7ce5Heiko Carstens#ifndef CONFIG_64BIT 76146e4b3c8b92071b18f0b2e6f47165bad4f9e825Martin Schwidefsky# define PMD_SHIFT 20 77146e4b3c8b92071b18f0b2e6f47165bad4f9e825Martin Schwidefsky# define PUD_SHIFT 20 78146e4b3c8b92071b18f0b2e6f47165bad4f9e825Martin Schwidefsky# define PGDIR_SHIFT 20 79f4815ac6c935b8e441fe12504d62e0e8ff7f7ce5Heiko Carstens#else /* CONFIG_64BIT */ 80146e4b3c8b92071b18f0b2e6f47165bad4f9e825Martin Schwidefsky# define PMD_SHIFT 20 81190a1d722a59725706daf832bc8a511ed62f249dMartin Schwidefsky# define PUD_SHIFT 31 825a216a20837c5f5fa1ca4b8ae8991ffd96b08e6fMartin Schwidefsky# define PGDIR_SHIFT 42 83f4815ac6c935b8e441fe12504d62e0e8ff7f7ce5Heiko Carstens#endif /* CONFIG_64BIT */ 841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define PMD_SIZE (1UL << PMD_SHIFT) 861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define PMD_MASK (~(PMD_SIZE-1)) 87190a1d722a59725706daf832bc8a511ed62f249dMartin Schwidefsky#define PUD_SIZE (1UL << PUD_SHIFT) 88190a1d722a59725706daf832bc8a511ed62f249dMartin Schwidefsky#define PUD_MASK (~(PUD_SIZE-1)) 895a216a20837c5f5fa1ca4b8ae8991ffd96b08e6fMartin Schwidefsky#define PGDIR_SIZE (1UL << PGDIR_SHIFT) 905a216a20837c5f5fa1ca4b8ae8991ffd96b08e6fMartin Schwidefsky#define PGDIR_MASK (~(PGDIR_SIZE-1)) 911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * entries per page directory level: the S390 is two-level, so 941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * we don't really have any PMD directory physically. 951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * for S390 segment-table entries are combined to one PGD 961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * that leads to 1024 pte per pgd 971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 98146e4b3c8b92071b18f0b2e6f47165bad4f9e825Martin Schwidefsky#define PTRS_PER_PTE 256 99f4815ac6c935b8e441fe12504d62e0e8ff7f7ce5Heiko Carstens#ifndef CONFIG_64BIT 100146e4b3c8b92071b18f0b2e6f47165bad4f9e825Martin Schwidefsky#define PTRS_PER_PMD 1 1015a216a20837c5f5fa1ca4b8ae8991ffd96b08e6fMartin Schwidefsky#define PTRS_PER_PUD 1 102f4815ac6c935b8e441fe12504d62e0e8ff7f7ce5Heiko Carstens#else /* CONFIG_64BIT */ 103146e4b3c8b92071b18f0b2e6f47165bad4f9e825Martin Schwidefsky#define PTRS_PER_PMD 2048 1045a216a20837c5f5fa1ca4b8ae8991ffd96b08e6fMartin Schwidefsky#define PTRS_PER_PUD 2048 105f4815ac6c935b8e441fe12504d62e0e8ff7f7ce5Heiko Carstens#endif /* CONFIG_64BIT */ 106146e4b3c8b92071b18f0b2e6f47165bad4f9e825Martin Schwidefsky#define PTRS_PER_PGD 2048 1071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 108d455a3696c72283923e6870e9e4fe1daa861d7cdHugh Dickins#define FIRST_USER_ADDRESS 0 109d455a3696c72283923e6870e9e4fe1daa861d7cdHugh Dickins 1101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define pte_ERROR(e) \ 1111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds printk("%s:%d: bad pte %p.\n", __FILE__, __LINE__, (void *) pte_val(e)) 1121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define pmd_ERROR(e) \ 1131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds printk("%s:%d: bad pmd %p.\n", __FILE__, __LINE__, (void *) pmd_val(e)) 114190a1d722a59725706daf832bc8a511ed62f249dMartin Schwidefsky#define pud_ERROR(e) \ 115190a1d722a59725706daf832bc8a511ed62f249dMartin Schwidefsky printk("%s:%d: bad pud %p.\n", __FILE__, __LINE__, (void *) pud_val(e)) 1161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define pgd_ERROR(e) \ 1171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds printk("%s:%d: bad pgd %p.\n", __FILE__, __LINE__, (void *) pgd_val(e)) 1181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifndef __ASSEMBLY__ 1201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 1215fd9c6e214547a32d3da6ee4284c79004d667bc8Christian Borntraeger * The vmalloc area will always be on the topmost area of the kernel 1227d3f661e5757e84f1fb2e10093cfa2f7b057bc2fMartin Schwidefsky * mapping. We reserve 96MB (31bit) / 128GB (64bit) for vmalloc, 1235fd9c6e214547a32d3da6ee4284c79004d667bc8Christian Borntraeger * which should be enough for any sane case. 1245fd9c6e214547a32d3da6ee4284c79004d667bc8Christian Borntraeger * By putting vmalloc at the top, we maximise the gap between physical 1255fd9c6e214547a32d3da6ee4284c79004d667bc8Christian Borntraeger * memory and vmalloc to catch misplaced memory accesses. As a side 1265fd9c6e214547a32d3da6ee4284c79004d667bc8Christian Borntraeger * effect, this also makes sure that 64 bit module code cannot be used 1275fd9c6e214547a32d3da6ee4284c79004d667bc8Christian Borntraeger * as system call address. 1288b62bc9642300471737bc3b77b2a4a2ead46dedbHeiko Carstens */ 129239a64255fae8933d95273b5b92545949ca4e743Heiko Carstensextern unsigned long VMALLOC_START; 13014045ebf1e1156d966a796cacad91028e01797e5Martin Schwidefskyextern unsigned long VMALLOC_END; 13114045ebf1e1156d966a796cacad91028e01797e5Martin Schwidefskyextern struct page *vmemmap; 132239a64255fae8933d95273b5b92545949ca4e743Heiko Carstens 13314045ebf1e1156d966a796cacad91028e01797e5Martin Schwidefsky#define VMEM_MAX_PHYS ((unsigned long) vmemmap) 1345fd9c6e214547a32d3da6ee4284c79004d667bc8Christian Borntraeger 1351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 1361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * A 31 bit pagetable entry of S390 has following format: 1371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * | PFRA | | OS | 1381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 0 0IP0 1391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 00000000001111111111222222222233 1401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 01234567890123456789012345678901 1411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 1421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * I Page-Invalid Bit: Page is not available for address-translation 1431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * P Page-Protection Bit: Store access not possible for page 1441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 1451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * A 31 bit segmenttable entry of S390 has following format: 1461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * | P-table origin | |PTL 1471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 0 IC 1481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 00000000001111111111222222222233 1491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 01234567890123456789012345678901 1501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 1511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * I Segment-Invalid Bit: Segment is not available for address-translation 1521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * C Common-Segment Bit: Segment is not private (PoP 3-30) 1531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * PTL Page-Table-Length: Page-table length (PTL+1*16 entries -> up to 256) 1541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 1551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * The 31 bit segmenttable origin of S390 has following format: 1561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 1571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * |S-table origin | | STL | 1581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * X **GPS 1591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 00000000001111111111222222222233 1601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 01234567890123456789012345678901 1611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 1621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * X Space-Switch event: 1631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * G Segment-Invalid Bit: * 1641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * P Private-Space Bit: Segment is not private (PoP 3-30) 1651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * S Storage-Alteration: 1661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * STL Segment-Table-Length: Segment-table length (STL+1*16 entries -> up to 2048) 1671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 1681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * A 64 bit pagetable entry of S390 has following format: 1696a985c6194017de2c062916ad1cd00dee0302c40Christian Borntraeger * | PFRA |0IPC| OS | 1701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 0000000000111111111122222222223333333333444444444455555555556666 1711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 0123456789012345678901234567890123456789012345678901234567890123 1721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 1731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * I Page-Invalid Bit: Page is not available for address-translation 1741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * P Page-Protection Bit: Store access not possible for page 1756a985c6194017de2c062916ad1cd00dee0302c40Christian Borntraeger * C Change-bit override: HW is not required to set change bit 1761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 1771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * A 64 bit segmenttable entry of S390 has following format: 1781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * | P-table origin | TT 1791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 0000000000111111111122222222223333333333444444444455555555556666 1801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 0123456789012345678901234567890123456789012345678901234567890123 1811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 1821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * I Segment-Invalid Bit: Segment is not available for address-translation 1831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * C Common-Segment Bit: Segment is not private (PoP 3-30) 1841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * P Page-Protection Bit: Store access not possible for page 1851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * TT Type 00 1861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 1871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * A 64 bit region table entry of S390 has following format: 1881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * | S-table origin | TF TTTL 1891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 0000000000111111111122222222223333333333444444444455555555556666 1901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 0123456789012345678901234567890123456789012345678901234567890123 1911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 1921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * I Segment-Invalid Bit: Segment is not available for address-translation 1931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * TT Type 01 1941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * TF 195190a1d722a59725706daf832bc8a511ed62f249dMartin Schwidefsky * TL Table length 1961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 1971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * The 64 bit regiontable origin of S390 has following format: 1981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * | region table origon | DTTL 1991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 0000000000111111111122222222223333333333444444444455555555556666 2001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 0123456789012345678901234567890123456789012345678901234567890123 2011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 2021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * X Space-Switch event: 2031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * G Segment-Invalid Bit: 2041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * P Private-Space Bit: 2051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * S Storage-Alteration: 2061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * R Real space 2071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * TL Table-Length: 2081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 2091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * A storage key has the following format: 2101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * | ACC |F|R|C|0| 2111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 0 3 4 5 6 7 2121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * ACC: access key 2131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * F : fetch protection bit 2141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * R : referenced bit 2151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * C : changed bit 2161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 2171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* Hardware bits in the page table entry */ 2196a985c6194017de2c062916ad1cd00dee0302c40Christian Borntraeger#define _PAGE_CO 0x100 /* HW Change-bit override */ 220833774849d50a59f58e9bdfc3d9c88e682b3596dMartin Schwidefsky#define _PAGE_RO 0x200 /* HW read-only bit */ 221833774849d50a59f58e9bdfc3d9c88e682b3596dMartin Schwidefsky#define _PAGE_INVALID 0x400 /* HW invalid bit */ 2223610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky 2233610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky/* Software bits in the page table entry */ 224833774849d50a59f58e9bdfc3d9c88e682b3596dMartin Schwidefsky#define _PAGE_SWT 0x001 /* SW pte type bit t */ 225833774849d50a59f58e9bdfc3d9c88e682b3596dMartin Schwidefsky#define _PAGE_SWX 0x002 /* SW pte type bit x */ 226b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky#define _PAGE_SWC 0x004 /* SW pte changed bit (for KVM) */ 227b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky#define _PAGE_SWR 0x008 /* SW pte referenced bit (for KVM) */ 228b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky#define _PAGE_SPECIAL 0x010 /* SW associated with special page */ 229a08cb629f546d1cecebe955392197f226e58dbe1Nick Piggin#define __HAVE_ARCH_PTE_SPECIAL 2301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 231138c9021ca68d6f8a6fac3418995fee102a3cc22Nick Piggin/* Set of bits not changed in pte_modify */ 232b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky#define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_SPECIAL | _PAGE_SWC | _PAGE_SWR) 233138c9021ca68d6f8a6fac3418995fee102a3cc22Nick Piggin 234833774849d50a59f58e9bdfc3d9c88e682b3596dMartin Schwidefsky/* Six different types of pages. */ 2359282ed929758b82f448a40d3c17319d794970624Gerald Schaefer#define _PAGE_TYPE_EMPTY 0x400 2369282ed929758b82f448a40d3c17319d794970624Gerald Schaefer#define _PAGE_TYPE_NONE 0x401 237833774849d50a59f58e9bdfc3d9c88e682b3596dMartin Schwidefsky#define _PAGE_TYPE_SWAP 0x403 238833774849d50a59f58e9bdfc3d9c88e682b3596dMartin Schwidefsky#define _PAGE_TYPE_FILE 0x601 /* bit 0x002 is used for offset !! */ 2399282ed929758b82f448a40d3c17319d794970624Gerald Schaefer#define _PAGE_TYPE_RO 0x200 2409282ed929758b82f448a40d3c17319d794970624Gerald Schaefer#define _PAGE_TYPE_RW 0x000 2411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 242833774849d50a59f58e9bdfc3d9c88e682b3596dMartin Schwidefsky/* 24353492b1de46a7576170e865062ffcfc93bb5650bGerald Schaefer * Only four types for huge pages, using the invalid bit and protection bit 24453492b1de46a7576170e865062ffcfc93bb5650bGerald Schaefer * of a segment table entry. 24553492b1de46a7576170e865062ffcfc93bb5650bGerald Schaefer */ 24653492b1de46a7576170e865062ffcfc93bb5650bGerald Schaefer#define _HPAGE_TYPE_EMPTY 0x020 /* _SEGMENT_ENTRY_INV */ 24753492b1de46a7576170e865062ffcfc93bb5650bGerald Schaefer#define _HPAGE_TYPE_NONE 0x220 24853492b1de46a7576170e865062ffcfc93bb5650bGerald Schaefer#define _HPAGE_TYPE_RO 0x200 /* _SEGMENT_ENTRY_RO */ 24953492b1de46a7576170e865062ffcfc93bb5650bGerald Schaefer#define _HPAGE_TYPE_RW 0x000 25053492b1de46a7576170e865062ffcfc93bb5650bGerald Schaefer 25153492b1de46a7576170e865062ffcfc93bb5650bGerald Schaefer/* 252833774849d50a59f58e9bdfc3d9c88e682b3596dMartin Schwidefsky * PTE type bits are rather complicated. handle_pte_fault uses pte_present, 253833774849d50a59f58e9bdfc3d9c88e682b3596dMartin Schwidefsky * pte_none and pte_file to find out the pte type WITHOUT holding the page 254833774849d50a59f58e9bdfc3d9c88e682b3596dMartin Schwidefsky * table lock. ptep_clear_flush on the other hand uses ptep_clear_flush to 255833774849d50a59f58e9bdfc3d9c88e682b3596dMartin Schwidefsky * invalidate a given pte. ipte sets the hw invalid bit and clears all tlbs 256833774849d50a59f58e9bdfc3d9c88e682b3596dMartin Schwidefsky * for the page. The page table entry is set to _PAGE_TYPE_EMPTY afterwards. 257833774849d50a59f58e9bdfc3d9c88e682b3596dMartin Schwidefsky * This change is done while holding the lock, but the intermediate step 258833774849d50a59f58e9bdfc3d9c88e682b3596dMartin Schwidefsky * of a previously valid pte with the hw invalid bit set can be observed by 259833774849d50a59f58e9bdfc3d9c88e682b3596dMartin Schwidefsky * handle_pte_fault. That makes it necessary that all valid pte types with 260833774849d50a59f58e9bdfc3d9c88e682b3596dMartin Schwidefsky * the hw invalid bit set must be distinguishable from the four pte types 261833774849d50a59f58e9bdfc3d9c88e682b3596dMartin Schwidefsky * empty, none, swap and file. 262833774849d50a59f58e9bdfc3d9c88e682b3596dMartin Schwidefsky * 263833774849d50a59f58e9bdfc3d9c88e682b3596dMartin Schwidefsky * irxt ipte irxt 264833774849d50a59f58e9bdfc3d9c88e682b3596dMartin Schwidefsky * _PAGE_TYPE_EMPTY 1000 -> 1000 265833774849d50a59f58e9bdfc3d9c88e682b3596dMartin Schwidefsky * _PAGE_TYPE_NONE 1001 -> 1001 266833774849d50a59f58e9bdfc3d9c88e682b3596dMartin Schwidefsky * _PAGE_TYPE_SWAP 1011 -> 1011 267833774849d50a59f58e9bdfc3d9c88e682b3596dMartin Schwidefsky * _PAGE_TYPE_FILE 11?1 -> 11?1 268833774849d50a59f58e9bdfc3d9c88e682b3596dMartin Schwidefsky * _PAGE_TYPE_RO 0100 -> 1100 269833774849d50a59f58e9bdfc3d9c88e682b3596dMartin Schwidefsky * _PAGE_TYPE_RW 0000 -> 1000 270833774849d50a59f58e9bdfc3d9c88e682b3596dMartin Schwidefsky * 271c1821c2e9711adc3cd298a16b7237c92a2cee78dGerald Schaefer * pte_none is true for bits combinations 1000, 1010, 1100, 1110 272833774849d50a59f58e9bdfc3d9c88e682b3596dMartin Schwidefsky * pte_present is true for bits combinations 0000, 0010, 0100, 0110, 1001 273833774849d50a59f58e9bdfc3d9c88e682b3596dMartin Schwidefsky * pte_file is true for bits combinations 1101, 1111 274c1821c2e9711adc3cd298a16b7237c92a2cee78dGerald Schaefer * swap pte is 1011 and 0001, 0011, 0101, 0111 are invalid. 275833774849d50a59f58e9bdfc3d9c88e682b3596dMartin Schwidefsky */ 276833774849d50a59f58e9bdfc3d9c88e682b3596dMartin Schwidefsky 277f4815ac6c935b8e441fe12504d62e0e8ff7f7ce5Heiko Carstens#ifndef CONFIG_64BIT 2781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2793610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky/* Bits in the segment table address-space-control-element */ 2803610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky#define _ASCE_SPACE_SWITCH 0x80000000UL /* space switch event */ 2813610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky#define _ASCE_ORIGIN_MASK 0x7ffff000UL /* segment table origin */ 2823610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky#define _ASCE_PRIVATE_SPACE 0x100 /* private space control */ 2833610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky#define _ASCE_ALT_EVENT 0x80 /* storage alteration event control */ 2843610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky#define _ASCE_TABLE_LENGTH 0x7f /* 128 x 64 entries = 8k */ 2851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2863610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky/* Bits in the segment table entry */ 2873610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky#define _SEGMENT_ENTRY_ORIGIN 0x7fffffc0UL /* page table origin */ 28880217147a3d80c8a4e48f06e2f6e965455f3fe2aMartin Schwidefsky#define _SEGMENT_ENTRY_RO 0x200 /* page protection bit */ 2893610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky#define _SEGMENT_ENTRY_INV 0x20 /* invalid segment table entry */ 2903610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky#define _SEGMENT_ENTRY_COMMON 0x10 /* common segment bit */ 2913610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky#define _SEGMENT_ENTRY_PTL 0x0f /* page table length */ 2921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2933610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky#define _SEGMENT_ENTRY (_SEGMENT_ENTRY_PTL) 2943610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky#define _SEGMENT_ENTRY_EMPTY (_SEGMENT_ENTRY_INV) 2951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2966c61cfe91be53b444abc1da2dbab14efa77706c0Martin Schwidefsky/* Page status table bits for virtualization */ 2976c61cfe91be53b444abc1da2dbab14efa77706c0Martin Schwidefsky#define RCP_ACC_BITS 0xf0000000UL 2986c61cfe91be53b444abc1da2dbab14efa77706c0Martin Schwidefsky#define RCP_FP_BIT 0x08000000UL 2996c61cfe91be53b444abc1da2dbab14efa77706c0Martin Schwidefsky#define RCP_PCL_BIT 0x00800000UL 3006c61cfe91be53b444abc1da2dbab14efa77706c0Martin Schwidefsky#define RCP_HR_BIT 0x00400000UL 3016c61cfe91be53b444abc1da2dbab14efa77706c0Martin Schwidefsky#define RCP_HC_BIT 0x00200000UL 3026c61cfe91be53b444abc1da2dbab14efa77706c0Martin Schwidefsky#define RCP_GR_BIT 0x00040000UL 3036c61cfe91be53b444abc1da2dbab14efa77706c0Martin Schwidefsky#define RCP_GC_BIT 0x00020000UL 3046c61cfe91be53b444abc1da2dbab14efa77706c0Martin Schwidefsky 3056c61cfe91be53b444abc1da2dbab14efa77706c0Martin Schwidefsky/* User dirty / referenced bit for KVM's migration feature */ 3066c61cfe91be53b444abc1da2dbab14efa77706c0Martin Schwidefsky#define KVM_UR_BIT 0x00008000UL 3076c61cfe91be53b444abc1da2dbab14efa77706c0Martin Schwidefsky#define KVM_UC_BIT 0x00004000UL 3086c61cfe91be53b444abc1da2dbab14efa77706c0Martin Schwidefsky 309f4815ac6c935b8e441fe12504d62e0e8ff7f7ce5Heiko Carstens#else /* CONFIG_64BIT */ 3101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3113610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky/* Bits in the segment/region table address-space-control-element */ 3123610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky#define _ASCE_ORIGIN ~0xfffUL/* segment table origin */ 3133610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky#define _ASCE_PRIVATE_SPACE 0x100 /* private space control */ 3143610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky#define _ASCE_ALT_EVENT 0x80 /* storage alteration event control */ 3153610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky#define _ASCE_SPACE_SWITCH 0x40 /* space switch event */ 3163610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky#define _ASCE_REAL_SPACE 0x20 /* real space control */ 3173610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky#define _ASCE_TYPE_MASK 0x0c /* asce table type mask */ 3183610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky#define _ASCE_TYPE_REGION1 0x0c /* region first table type */ 3193610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky#define _ASCE_TYPE_REGION2 0x08 /* region second table type */ 3203610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky#define _ASCE_TYPE_REGION3 0x04 /* region third table type */ 3213610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky#define _ASCE_TYPE_SEGMENT 0x00 /* segment table type */ 3223610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky#define _ASCE_TABLE_LENGTH 0x03 /* region table length */ 3233610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky 3243610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky/* Bits in the region table entry */ 3253610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky#define _REGION_ENTRY_ORIGIN ~0xfffUL/* region/segment table origin */ 3263610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky#define _REGION_ENTRY_INV 0x20 /* invalid region table entry */ 3273610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky#define _REGION_ENTRY_TYPE_MASK 0x0c /* region/segment table type mask */ 3283610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky#define _REGION_ENTRY_TYPE_R1 0x0c /* region first table type */ 3293610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky#define _REGION_ENTRY_TYPE_R2 0x08 /* region second table type */ 3303610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky#define _REGION_ENTRY_TYPE_R3 0x04 /* region third table type */ 3313610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky#define _REGION_ENTRY_LENGTH 0x03 /* region third length */ 3323610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky 3333610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky#define _REGION1_ENTRY (_REGION_ENTRY_TYPE_R1 | _REGION_ENTRY_LENGTH) 3343610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky#define _REGION1_ENTRY_EMPTY (_REGION_ENTRY_TYPE_R1 | _REGION_ENTRY_INV) 3353610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky#define _REGION2_ENTRY (_REGION_ENTRY_TYPE_R2 | _REGION_ENTRY_LENGTH) 3363610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky#define _REGION2_ENTRY_EMPTY (_REGION_ENTRY_TYPE_R2 | _REGION_ENTRY_INV) 3373610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky#define _REGION3_ENTRY (_REGION_ENTRY_TYPE_R3 | _REGION_ENTRY_LENGTH) 3383610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky#define _REGION3_ENTRY_EMPTY (_REGION_ENTRY_TYPE_R3 | _REGION_ENTRY_INV) 3393610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky 3401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* Bits in the segment table entry */ 3413610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky#define _SEGMENT_ENTRY_ORIGIN ~0x7ffUL/* segment table origin */ 3423610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky#define _SEGMENT_ENTRY_RO 0x200 /* page protection bit */ 3433610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky#define _SEGMENT_ENTRY_INV 0x20 /* invalid segment table entry */ 3441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3453610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky#define _SEGMENT_ENTRY (0) 3463610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky#define _SEGMENT_ENTRY_EMPTY (_SEGMENT_ENTRY_INV) 3473610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky 34853492b1de46a7576170e865062ffcfc93bb5650bGerald Schaefer#define _SEGMENT_ENTRY_LARGE 0x400 /* STE-format control, large page */ 34953492b1de46a7576170e865062ffcfc93bb5650bGerald Schaefer#define _SEGMENT_ENTRY_CO 0x100 /* change-recording override */ 35053492b1de46a7576170e865062ffcfc93bb5650bGerald Schaefer 3516c61cfe91be53b444abc1da2dbab14efa77706c0Martin Schwidefsky/* Page status table bits for virtualization */ 3526c61cfe91be53b444abc1da2dbab14efa77706c0Martin Schwidefsky#define RCP_ACC_BITS 0xf000000000000000UL 3536c61cfe91be53b444abc1da2dbab14efa77706c0Martin Schwidefsky#define RCP_FP_BIT 0x0800000000000000UL 3546c61cfe91be53b444abc1da2dbab14efa77706c0Martin Schwidefsky#define RCP_PCL_BIT 0x0080000000000000UL 3556c61cfe91be53b444abc1da2dbab14efa77706c0Martin Schwidefsky#define RCP_HR_BIT 0x0040000000000000UL 3566c61cfe91be53b444abc1da2dbab14efa77706c0Martin Schwidefsky#define RCP_HC_BIT 0x0020000000000000UL 3576c61cfe91be53b444abc1da2dbab14efa77706c0Martin Schwidefsky#define RCP_GR_BIT 0x0004000000000000UL 3586c61cfe91be53b444abc1da2dbab14efa77706c0Martin Schwidefsky#define RCP_GC_BIT 0x0002000000000000UL 3596c61cfe91be53b444abc1da2dbab14efa77706c0Martin Schwidefsky 3606c61cfe91be53b444abc1da2dbab14efa77706c0Martin Schwidefsky/* User dirty / referenced bit for KVM's migration feature */ 3616c61cfe91be53b444abc1da2dbab14efa77706c0Martin Schwidefsky#define KVM_UR_BIT 0x0000800000000000UL 3626c61cfe91be53b444abc1da2dbab14efa77706c0Martin Schwidefsky#define KVM_UC_BIT 0x0000400000000000UL 3636c61cfe91be53b444abc1da2dbab14efa77706c0Martin Schwidefsky 364f4815ac6c935b8e441fe12504d62e0e8ff7f7ce5Heiko Carstens#endif /* CONFIG_64BIT */ 3651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 3673610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky * A user page table pointer has the space-switch-event bit, the 3683610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky * private-space-control bit and the storage-alteration-event-control 3693610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky * bit set. A kernel page table pointer doesn't need them. 3701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 3713610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky#define _ASCE_USER_BITS (_ASCE_SPACE_SWITCH | _ASCE_PRIVATE_SPACE | \ 3723610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky _ASCE_ALT_EVENT) 3731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 3759282ed929758b82f448a40d3c17319d794970624Gerald Schaefer * Page protection definitions. 3761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 3779282ed929758b82f448a40d3c17319d794970624Gerald Schaefer#define PAGE_NONE __pgprot(_PAGE_TYPE_NONE) 3789282ed929758b82f448a40d3c17319d794970624Gerald Schaefer#define PAGE_RO __pgprot(_PAGE_TYPE_RO) 3799282ed929758b82f448a40d3c17319d794970624Gerald Schaefer#define PAGE_RW __pgprot(_PAGE_TYPE_RW) 3809282ed929758b82f448a40d3c17319d794970624Gerald Schaefer 3819282ed929758b82f448a40d3c17319d794970624Gerald Schaefer#define PAGE_KERNEL PAGE_RW 3829282ed929758b82f448a40d3c17319d794970624Gerald Schaefer#define PAGE_COPY PAGE_RO 3831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 385043d07084b5347a26eab0a07aa13a4a929ad9e71Martin Schwidefsky * On s390 the page table entry has an invalid bit and a read-only bit. 386043d07084b5347a26eab0a07aa13a4a929ad9e71Martin Schwidefsky * Read permission implies execute permission and write permission 387043d07084b5347a26eab0a07aa13a4a929ad9e71Martin Schwidefsky * implies read permission. 3881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 3891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /*xwr*/ 3909282ed929758b82f448a40d3c17319d794970624Gerald Schaefer#define __P000 PAGE_NONE 3919282ed929758b82f448a40d3c17319d794970624Gerald Schaefer#define __P001 PAGE_RO 3929282ed929758b82f448a40d3c17319d794970624Gerald Schaefer#define __P010 PAGE_RO 3939282ed929758b82f448a40d3c17319d794970624Gerald Schaefer#define __P011 PAGE_RO 394043d07084b5347a26eab0a07aa13a4a929ad9e71Martin Schwidefsky#define __P100 PAGE_RO 395043d07084b5347a26eab0a07aa13a4a929ad9e71Martin Schwidefsky#define __P101 PAGE_RO 396043d07084b5347a26eab0a07aa13a4a929ad9e71Martin Schwidefsky#define __P110 PAGE_RO 397043d07084b5347a26eab0a07aa13a4a929ad9e71Martin Schwidefsky#define __P111 PAGE_RO 3989282ed929758b82f448a40d3c17319d794970624Gerald Schaefer 3999282ed929758b82f448a40d3c17319d794970624Gerald Schaefer#define __S000 PAGE_NONE 4009282ed929758b82f448a40d3c17319d794970624Gerald Schaefer#define __S001 PAGE_RO 4019282ed929758b82f448a40d3c17319d794970624Gerald Schaefer#define __S010 PAGE_RW 4029282ed929758b82f448a40d3c17319d794970624Gerald Schaefer#define __S011 PAGE_RW 403043d07084b5347a26eab0a07aa13a4a929ad9e71Martin Schwidefsky#define __S100 PAGE_RO 404043d07084b5347a26eab0a07aa13a4a929ad9e71Martin Schwidefsky#define __S101 PAGE_RO 405043d07084b5347a26eab0a07aa13a4a929ad9e71Martin Schwidefsky#define __S110 PAGE_RW 406043d07084b5347a26eab0a07aa13a4a929ad9e71Martin Schwidefsky#define __S111 PAGE_RW 4071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 408b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefskystatic inline int mm_exclusive(struct mm_struct *mm) 4091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 410b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky return likely(mm == current->active_mm && 411b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky atomic_read(&mm->context.attach_count) <= 1); 4121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 4131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 414b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefskystatic inline int mm_has_pgste(struct mm_struct *mm) 415b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky{ 416b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky#ifdef CONFIG_PGSTE 417b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky if (unlikely(mm->context.has_pgste)) 418b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky return 1; 419b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky#endif 420b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky return 0; 421b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky} 4221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 4231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * pgd/pmd/pte query functions 4241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 425f4815ac6c935b8e441fe12504d62e0e8ff7f7ce5Heiko Carstens#ifndef CONFIG_64BIT 4261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4274448aaf0faafff3f275d15937c28b6346760e028Adrian Bunkstatic inline int pgd_present(pgd_t pgd) { return 1; } 4284448aaf0faafff3f275d15937c28b6346760e028Adrian Bunkstatic inline int pgd_none(pgd_t pgd) { return 0; } 4294448aaf0faafff3f275d15937c28b6346760e028Adrian Bunkstatic inline int pgd_bad(pgd_t pgd) { return 0; } 4301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 431190a1d722a59725706daf832bc8a511ed62f249dMartin Schwidefskystatic inline int pud_present(pud_t pud) { return 1; } 432190a1d722a59725706daf832bc8a511ed62f249dMartin Schwidefskystatic inline int pud_none(pud_t pud) { return 0; } 433190a1d722a59725706daf832bc8a511ed62f249dMartin Schwidefskystatic inline int pud_bad(pud_t pud) { return 0; } 434190a1d722a59725706daf832bc8a511ed62f249dMartin Schwidefsky 435f4815ac6c935b8e441fe12504d62e0e8ff7f7ce5Heiko Carstens#else /* CONFIG_64BIT */ 4361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4375a216a20837c5f5fa1ca4b8ae8991ffd96b08e6fMartin Schwidefskystatic inline int pgd_present(pgd_t pgd) 4385a216a20837c5f5fa1ca4b8ae8991ffd96b08e6fMartin Schwidefsky{ 4396252d702c5311ce916caf75ed82e5c8245171c92Martin Schwidefsky if ((pgd_val(pgd) & _REGION_ENTRY_TYPE_MASK) < _REGION_ENTRY_TYPE_R2) 4406252d702c5311ce916caf75ed82e5c8245171c92Martin Schwidefsky return 1; 4415a216a20837c5f5fa1ca4b8ae8991ffd96b08e6fMartin Schwidefsky return (pgd_val(pgd) & _REGION_ENTRY_ORIGIN) != 0UL; 4425a216a20837c5f5fa1ca4b8ae8991ffd96b08e6fMartin Schwidefsky} 4435a216a20837c5f5fa1ca4b8ae8991ffd96b08e6fMartin Schwidefsky 4445a216a20837c5f5fa1ca4b8ae8991ffd96b08e6fMartin Schwidefskystatic inline int pgd_none(pgd_t pgd) 4455a216a20837c5f5fa1ca4b8ae8991ffd96b08e6fMartin Schwidefsky{ 4466252d702c5311ce916caf75ed82e5c8245171c92Martin Schwidefsky if ((pgd_val(pgd) & _REGION_ENTRY_TYPE_MASK) < _REGION_ENTRY_TYPE_R2) 4476252d702c5311ce916caf75ed82e5c8245171c92Martin Schwidefsky return 0; 4485a216a20837c5f5fa1ca4b8ae8991ffd96b08e6fMartin Schwidefsky return (pgd_val(pgd) & _REGION_ENTRY_INV) != 0UL; 4495a216a20837c5f5fa1ca4b8ae8991ffd96b08e6fMartin Schwidefsky} 4505a216a20837c5f5fa1ca4b8ae8991ffd96b08e6fMartin Schwidefsky 4515a216a20837c5f5fa1ca4b8ae8991ffd96b08e6fMartin Schwidefskystatic inline int pgd_bad(pgd_t pgd) 4525a216a20837c5f5fa1ca4b8ae8991ffd96b08e6fMartin Schwidefsky{ 4536252d702c5311ce916caf75ed82e5c8245171c92Martin Schwidefsky /* 4546252d702c5311ce916caf75ed82e5c8245171c92Martin Schwidefsky * With dynamic page table levels the pgd can be a region table 4556252d702c5311ce916caf75ed82e5c8245171c92Martin Schwidefsky * entry or a segment table entry. Check for the bit that are 4566252d702c5311ce916caf75ed82e5c8245171c92Martin Schwidefsky * invalid for either table entry. 4576252d702c5311ce916caf75ed82e5c8245171c92Martin Schwidefsky */ 4585a216a20837c5f5fa1ca4b8ae8991ffd96b08e6fMartin Schwidefsky unsigned long mask = 4596252d702c5311ce916caf75ed82e5c8245171c92Martin Schwidefsky ~_SEGMENT_ENTRY_ORIGIN & ~_REGION_ENTRY_INV & 4605a216a20837c5f5fa1ca4b8ae8991ffd96b08e6fMartin Schwidefsky ~_REGION_ENTRY_TYPE_MASK & ~_REGION_ENTRY_LENGTH; 4615a216a20837c5f5fa1ca4b8ae8991ffd96b08e6fMartin Schwidefsky return (pgd_val(pgd) & mask) != 0; 4625a216a20837c5f5fa1ca4b8ae8991ffd96b08e6fMartin Schwidefsky} 463190a1d722a59725706daf832bc8a511ed62f249dMartin Schwidefsky 464190a1d722a59725706daf832bc8a511ed62f249dMartin Schwidefskystatic inline int pud_present(pud_t pud) 4651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 4666252d702c5311ce916caf75ed82e5c8245171c92Martin Schwidefsky if ((pud_val(pud) & _REGION_ENTRY_TYPE_MASK) < _REGION_ENTRY_TYPE_R3) 4676252d702c5311ce916caf75ed82e5c8245171c92Martin Schwidefsky return 1; 4680d01792300c4d7425eabac9095c603cdb411d2a5Martin Schwidefsky return (pud_val(pud) & _REGION_ENTRY_ORIGIN) != 0UL; 4691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 4701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 471190a1d722a59725706daf832bc8a511ed62f249dMartin Schwidefskystatic inline int pud_none(pud_t pud) 4721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 4736252d702c5311ce916caf75ed82e5c8245171c92Martin Schwidefsky if ((pud_val(pud) & _REGION_ENTRY_TYPE_MASK) < _REGION_ENTRY_TYPE_R3) 4746252d702c5311ce916caf75ed82e5c8245171c92Martin Schwidefsky return 0; 4750d01792300c4d7425eabac9095c603cdb411d2a5Martin Schwidefsky return (pud_val(pud) & _REGION_ENTRY_INV) != 0UL; 4761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 4771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 478190a1d722a59725706daf832bc8a511ed62f249dMartin Schwidefskystatic inline int pud_bad(pud_t pud) 4791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 4806252d702c5311ce916caf75ed82e5c8245171c92Martin Schwidefsky /* 4816252d702c5311ce916caf75ed82e5c8245171c92Martin Schwidefsky * With dynamic page table levels the pud can be a region table 4826252d702c5311ce916caf75ed82e5c8245171c92Martin Schwidefsky * entry or a segment table entry. Check for the bit that are 4836252d702c5311ce916caf75ed82e5c8245171c92Martin Schwidefsky * invalid for either table entry. 4846252d702c5311ce916caf75ed82e5c8245171c92Martin Schwidefsky */ 4855a216a20837c5f5fa1ca4b8ae8991ffd96b08e6fMartin Schwidefsky unsigned long mask = 4866252d702c5311ce916caf75ed82e5c8245171c92Martin Schwidefsky ~_SEGMENT_ENTRY_ORIGIN & ~_REGION_ENTRY_INV & 4875a216a20837c5f5fa1ca4b8ae8991ffd96b08e6fMartin Schwidefsky ~_REGION_ENTRY_TYPE_MASK & ~_REGION_ENTRY_LENGTH; 4885a216a20837c5f5fa1ca4b8ae8991ffd96b08e6fMartin Schwidefsky return (pud_val(pud) & mask) != 0; 4891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 4901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 491f4815ac6c935b8e441fe12504d62e0e8ff7f7ce5Heiko Carstens#endif /* CONFIG_64BIT */ 4923610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky 4934448aaf0faafff3f275d15937c28b6346760e028Adrian Bunkstatic inline int pmd_present(pmd_t pmd) 4941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 4950d01792300c4d7425eabac9095c603cdb411d2a5Martin Schwidefsky return (pmd_val(pmd) & _SEGMENT_ENTRY_ORIGIN) != 0UL; 4961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 4971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4984448aaf0faafff3f275d15937c28b6346760e028Adrian Bunkstatic inline int pmd_none(pmd_t pmd) 4991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 5000d01792300c4d7425eabac9095c603cdb411d2a5Martin Schwidefsky return (pmd_val(pmd) & _SEGMENT_ENTRY_INV) != 0UL; 5011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 5021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5034448aaf0faafff3f275d15937c28b6346760e028Adrian Bunkstatic inline int pmd_bad(pmd_t pmd) 5041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 5053610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky unsigned long mask = ~_SEGMENT_ENTRY_ORIGIN & ~_SEGMENT_ENTRY_INV; 5063610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky return (pmd_val(pmd) & mask) != _SEGMENT_ENTRY; 5071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 5081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5094448aaf0faafff3f275d15937c28b6346760e028Adrian Bunkstatic inline int pte_none(pte_t pte) 5101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 511833774849d50a59f58e9bdfc3d9c88e682b3596dMartin Schwidefsky return (pte_val(pte) & _PAGE_INVALID) && !(pte_val(pte) & _PAGE_SWT); 5121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 5131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5144448aaf0faafff3f275d15937c28b6346760e028Adrian Bunkstatic inline int pte_present(pte_t pte) 5151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 516833774849d50a59f58e9bdfc3d9c88e682b3596dMartin Schwidefsky unsigned long mask = _PAGE_RO | _PAGE_INVALID | _PAGE_SWT | _PAGE_SWX; 517833774849d50a59f58e9bdfc3d9c88e682b3596dMartin Schwidefsky return (pte_val(pte) & mask) == _PAGE_TYPE_NONE || 518833774849d50a59f58e9bdfc3d9c88e682b3596dMartin Schwidefsky (!(pte_val(pte) & _PAGE_INVALID) && 519833774849d50a59f58e9bdfc3d9c88e682b3596dMartin Schwidefsky !(pte_val(pte) & _PAGE_SWT)); 5201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 5211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5224448aaf0faafff3f275d15937c28b6346760e028Adrian Bunkstatic inline int pte_file(pte_t pte) 5231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 524833774849d50a59f58e9bdfc3d9c88e682b3596dMartin Schwidefsky unsigned long mask = _PAGE_RO | _PAGE_INVALID | _PAGE_SWT; 525833774849d50a59f58e9bdfc3d9c88e682b3596dMartin Schwidefsky return (pte_val(pte) & mask) == _PAGE_TYPE_FILE; 5261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 5271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5287e675137a8e1a4d45822746456dd389b65745bf6Nick Pigginstatic inline int pte_special(pte_t pte) 5297e675137a8e1a4d45822746456dd389b65745bf6Nick Piggin{ 530a08cb629f546d1cecebe955392197f226e58dbe1Nick Piggin return (pte_val(pte) & _PAGE_SPECIAL); 5317e675137a8e1a4d45822746456dd389b65745bf6Nick Piggin} 5327e675137a8e1a4d45822746456dd389b65745bf6Nick Piggin 533ba8a9229ab9e80278c28ad68b15053f65b2b0a7cMartin Schwidefsky#define __HAVE_ARCH_PTE_SAME 534b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefskystatic inline int pte_same(pte_t a, pte_t b) 535b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky{ 536b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky return pte_val(a) == pte_val(b); 537b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky} 5381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 539b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefskystatic inline pgste_t pgste_get_lock(pte_t *ptep) 5405b7baf05783b1ac97a510243d7e82293416a7cf6Christian Borntraeger{ 541b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky unsigned long new = 0; 5425b7baf05783b1ac97a510243d7e82293416a7cf6Christian Borntraeger#ifdef CONFIG_PGSTE 543b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky unsigned long old; 544b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky 5455b7baf05783b1ac97a510243d7e82293416a7cf6Christian Borntraeger preempt_disable(); 546b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky asm( 547b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky " lg %0,%2\n" 548b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky "0: lgr %1,%0\n" 549b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky " nihh %0,0xff7f\n" /* clear RCP_PCL_BIT in old */ 550b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky " oihh %1,0x0080\n" /* set RCP_PCL_BIT in new */ 551b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky " csg %0,%1,%2\n" 552b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky " jl 0b\n" 553b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky : "=&d" (old), "=&d" (new), "=Q" (ptep[PTRS_PER_PTE]) 554b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky : "Q" (ptep[PTRS_PER_PTE]) : "cc"); 5555b7baf05783b1ac97a510243d7e82293416a7cf6Christian Borntraeger#endif 556b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky return __pgste(new); 5575b7baf05783b1ac97a510243d7e82293416a7cf6Christian Borntraeger} 5585b7baf05783b1ac97a510243d7e82293416a7cf6Christian Borntraeger 559b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefskystatic inline void pgste_set_unlock(pte_t *ptep, pgste_t pgste) 5605b7baf05783b1ac97a510243d7e82293416a7cf6Christian Borntraeger{ 5615b7baf05783b1ac97a510243d7e82293416a7cf6Christian Borntraeger#ifdef CONFIG_PGSTE 562b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky asm( 563b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky " nihh %1,0xff7f\n" /* clear RCP_PCL_BIT */ 564b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky " stg %1,%0\n" 565b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky : "=Q" (ptep[PTRS_PER_PTE]) 566b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky : "d" (pgste_val(pgste)), "Q" (ptep[PTRS_PER_PTE]) : "cc"); 5675b7baf05783b1ac97a510243d7e82293416a7cf6Christian Borntraeger preempt_enable(); 5685b7baf05783b1ac97a510243d7e82293416a7cf6Christian Borntraeger#endif 5695b7baf05783b1ac97a510243d7e82293416a7cf6Christian Borntraeger} 5705b7baf05783b1ac97a510243d7e82293416a7cf6Christian Borntraeger 571b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefskystatic inline pgste_t pgste_update_all(pte_t *ptep, pgste_t pgste) 5725b7baf05783b1ac97a510243d7e82293416a7cf6Christian Borntraeger{ 5735b7baf05783b1ac97a510243d7e82293416a7cf6Christian Borntraeger#ifdef CONFIG_PGSTE 574a43a9d93d40a69eceeb4e4a4c860cc20186d475cHeiko Carstens unsigned long address, bits; 575b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky unsigned char skey; 576b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky 57709b538833b85521d937a06faf61e6a3273253cc0Martin Schwidefsky if (!pte_present(*ptep)) 57809b538833b85521d937a06faf61e6a3273253cc0Martin Schwidefsky return pgste; 579a43a9d93d40a69eceeb4e4a4c860cc20186d475cHeiko Carstens address = pte_val(*ptep) & PAGE_MASK; 580a43a9d93d40a69eceeb4e4a4c860cc20186d475cHeiko Carstens skey = page_get_storage_key(address); 581b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky bits = skey & (_PAGE_CHANGED | _PAGE_REFERENCED); 582b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky /* Clear page changed & referenced bit in the storage key */ 5837c81878b34dd1b75dec5c8b68951d1439854d358Carsten Otte if (bits & _PAGE_CHANGED) 5847c81878b34dd1b75dec5c8b68951d1439854d358Carsten Otte page_set_storage_key(address, skey ^ bits, 1); 5857c81878b34dd1b75dec5c8b68951d1439854d358Carsten Otte else if (bits) 5867c81878b34dd1b75dec5c8b68951d1439854d358Carsten Otte page_reset_referenced(address); 587b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky /* Transfer page changed & referenced bit to guest bits in pgste */ 588b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pgste_val(pgste) |= bits << 48; /* RCP_GR_BIT & RCP_GC_BIT */ 589b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky /* Get host changed & referenced bits from pgste */ 590b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky bits |= (pgste_val(pgste) & (RCP_HR_BIT | RCP_HC_BIT)) >> 52; 591b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky /* Clear host bits in pgste. */ 592b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pgste_val(pgste) &= ~(RCP_HR_BIT | RCP_HC_BIT); 593b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pgste_val(pgste) &= ~(RCP_ACC_BITS | RCP_FP_BIT); 594b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky /* Copy page access key and fetch protection bit to pgste */ 595b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pgste_val(pgste) |= 596b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky (unsigned long) (skey & (_PAGE_ACC_BITS | _PAGE_FP_BIT)) << 56; 597b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky /* Transfer changed and referenced to kvm user bits */ 598b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pgste_val(pgste) |= bits << 45; /* KVM_UR_BIT & KVM_UC_BIT */ 599b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky /* Transfer changed & referenced to pte sofware bits */ 600b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pte_val(*ptep) |= bits << 1; /* _PAGE_SWR & _PAGE_SWC */ 601b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky#endif 602b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky return pgste; 603b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky 604b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky} 605b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky 606b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefskystatic inline pgste_t pgste_update_young(pte_t *ptep, pgste_t pgste) 607b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky{ 608b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky#ifdef CONFIG_PGSTE 609b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky int young; 610b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky 61109b538833b85521d937a06faf61e6a3273253cc0Martin Schwidefsky if (!pte_present(*ptep)) 61209b538833b85521d937a06faf61e6a3273253cc0Martin Schwidefsky return pgste; 613b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky young = page_reset_referenced(pte_val(*ptep) & PAGE_MASK); 614b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky /* Transfer page referenced bit to pte software bit (host view) */ 615b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky if (young || (pgste_val(pgste) & RCP_HR_BIT)) 616b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pte_val(*ptep) |= _PAGE_SWR; 617b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky /* Clear host referenced bit in pgste. */ 618b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pgste_val(pgste) &= ~RCP_HR_BIT; 619b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky /* Transfer page referenced bit to guest bit in pgste */ 620b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pgste_val(pgste) |= (unsigned long) young << 50; /* set RCP_GR_BIT */ 621b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky#endif 622b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky return pgste; 623b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky 624b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky} 625b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky 62609b538833b85521d937a06faf61e6a3273253cc0Martin Schwidefskystatic inline void pgste_set_pte(pte_t *ptep, pgste_t pgste, pte_t entry) 627b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky{ 628b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky#ifdef CONFIG_PGSTE 629a43a9d93d40a69eceeb4e4a4c860cc20186d475cHeiko Carstens unsigned long address; 630b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky unsigned long okey, nkey; 631b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky 63209b538833b85521d937a06faf61e6a3273253cc0Martin Schwidefsky if (!pte_present(entry)) 63309b538833b85521d937a06faf61e6a3273253cc0Martin Schwidefsky return; 63409b538833b85521d937a06faf61e6a3273253cc0Martin Schwidefsky address = pte_val(entry) & PAGE_MASK; 635a43a9d93d40a69eceeb4e4a4c860cc20186d475cHeiko Carstens okey = nkey = page_get_storage_key(address); 636b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky nkey &= ~(_PAGE_ACC_BITS | _PAGE_FP_BIT); 637b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky /* Set page access key and fetch protection bit from pgste */ 638b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky nkey |= (pgste_val(pgste) & (RCP_ACC_BITS | RCP_FP_BIT)) >> 56; 639b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky if (okey != nkey) 640a43a9d93d40a69eceeb4e4a4c860cc20186d475cHeiko Carstens page_set_storage_key(address, nkey, 1); 6415b7baf05783b1ac97a510243d7e82293416a7cf6Christian Borntraeger#endif 6425b7baf05783b1ac97a510243d7e82293416a7cf6Christian Borntraeger} 6435b7baf05783b1ac97a510243d7e82293416a7cf6Christian Borntraeger 644e5992f2e6c3829cd43dbc4438ee13dcd6506f7f3Martin Schwidefsky/** 645e5992f2e6c3829cd43dbc4438ee13dcd6506f7f3Martin Schwidefsky * struct gmap_struct - guest address space 646e5992f2e6c3829cd43dbc4438ee13dcd6506f7f3Martin Schwidefsky * @mm: pointer to the parent mm_struct 647e5992f2e6c3829cd43dbc4438ee13dcd6506f7f3Martin Schwidefsky * @table: pointer to the page directory 648480e5926ce3bb61ec229be2dab08bdce8abb8d2eChristian Borntraeger * @asce: address space control element for gmap page table 649e5992f2e6c3829cd43dbc4438ee13dcd6506f7f3Martin Schwidefsky * @crst_list: list of all crst tables used in the guest address space 650e5992f2e6c3829cd43dbc4438ee13dcd6506f7f3Martin Schwidefsky */ 651e5992f2e6c3829cd43dbc4438ee13dcd6506f7f3Martin Schwidefskystruct gmap { 652e5992f2e6c3829cd43dbc4438ee13dcd6506f7f3Martin Schwidefsky struct list_head list; 653e5992f2e6c3829cd43dbc4438ee13dcd6506f7f3Martin Schwidefsky struct mm_struct *mm; 654e5992f2e6c3829cd43dbc4438ee13dcd6506f7f3Martin Schwidefsky unsigned long *table; 655480e5926ce3bb61ec229be2dab08bdce8abb8d2eChristian Borntraeger unsigned long asce; 656e5992f2e6c3829cd43dbc4438ee13dcd6506f7f3Martin Schwidefsky struct list_head crst_list; 657e5992f2e6c3829cd43dbc4438ee13dcd6506f7f3Martin Schwidefsky}; 658e5992f2e6c3829cd43dbc4438ee13dcd6506f7f3Martin Schwidefsky 659e5992f2e6c3829cd43dbc4438ee13dcd6506f7f3Martin Schwidefsky/** 660e5992f2e6c3829cd43dbc4438ee13dcd6506f7f3Martin Schwidefsky * struct gmap_rmap - reverse mapping for segment table entries 661e5992f2e6c3829cd43dbc4438ee13dcd6506f7f3Martin Schwidefsky * @next: pointer to the next gmap_rmap structure in the list 662e5992f2e6c3829cd43dbc4438ee13dcd6506f7f3Martin Schwidefsky * @entry: pointer to a segment table entry 663e5992f2e6c3829cd43dbc4438ee13dcd6506f7f3Martin Schwidefsky */ 664e5992f2e6c3829cd43dbc4438ee13dcd6506f7f3Martin Schwidefskystruct gmap_rmap { 665e5992f2e6c3829cd43dbc4438ee13dcd6506f7f3Martin Schwidefsky struct list_head list; 666e5992f2e6c3829cd43dbc4438ee13dcd6506f7f3Martin Schwidefsky unsigned long *entry; 667e5992f2e6c3829cd43dbc4438ee13dcd6506f7f3Martin Schwidefsky}; 668e5992f2e6c3829cd43dbc4438ee13dcd6506f7f3Martin Schwidefsky 669e5992f2e6c3829cd43dbc4438ee13dcd6506f7f3Martin Schwidefsky/** 670e5992f2e6c3829cd43dbc4438ee13dcd6506f7f3Martin Schwidefsky * struct gmap_pgtable - gmap information attached to a page table 671e5992f2e6c3829cd43dbc4438ee13dcd6506f7f3Martin Schwidefsky * @vmaddr: address of the 1MB segment in the process virtual memory 672e5992f2e6c3829cd43dbc4438ee13dcd6506f7f3Martin Schwidefsky * @mapper: list of segment table entries maping a page table 673e5992f2e6c3829cd43dbc4438ee13dcd6506f7f3Martin Schwidefsky */ 674e5992f2e6c3829cd43dbc4438ee13dcd6506f7f3Martin Schwidefskystruct gmap_pgtable { 675e5992f2e6c3829cd43dbc4438ee13dcd6506f7f3Martin Schwidefsky unsigned long vmaddr; 676e5992f2e6c3829cd43dbc4438ee13dcd6506f7f3Martin Schwidefsky struct list_head mapper; 677e5992f2e6c3829cd43dbc4438ee13dcd6506f7f3Martin Schwidefsky}; 678e5992f2e6c3829cd43dbc4438ee13dcd6506f7f3Martin Schwidefsky 679e5992f2e6c3829cd43dbc4438ee13dcd6506f7f3Martin Schwidefskystruct gmap *gmap_alloc(struct mm_struct *mm); 680e5992f2e6c3829cd43dbc4438ee13dcd6506f7f3Martin Schwidefskyvoid gmap_free(struct gmap *gmap); 681e5992f2e6c3829cd43dbc4438ee13dcd6506f7f3Martin Schwidefskyvoid gmap_enable(struct gmap *gmap); 682e5992f2e6c3829cd43dbc4438ee13dcd6506f7f3Martin Schwidefskyvoid gmap_disable(struct gmap *gmap); 683e5992f2e6c3829cd43dbc4438ee13dcd6506f7f3Martin Schwidefskyint gmap_map_segment(struct gmap *gmap, unsigned long from, 684e5992f2e6c3829cd43dbc4438ee13dcd6506f7f3Martin Schwidefsky unsigned long to, unsigned long length); 685e5992f2e6c3829cd43dbc4438ee13dcd6506f7f3Martin Schwidefskyint gmap_unmap_segment(struct gmap *gmap, unsigned long to, unsigned long len); 686499069e1a421e2a85e76846c3237f00f1a5cb435Carsten Otteunsigned long __gmap_fault(unsigned long address, struct gmap *); 687e5992f2e6c3829cd43dbc4438ee13dcd6506f7f3Martin Schwidefskyunsigned long gmap_fault(unsigned long address, struct gmap *); 688388186bc920d9200202e4d25de66fa95b1b8fc68Christian Borntraegervoid gmap_discard(unsigned long from, unsigned long to, struct gmap *); 689e5992f2e6c3829cd43dbc4438ee13dcd6506f7f3Martin Schwidefsky 6901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 691b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky * Certain architectures need to do special things when PTEs 692b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky * within a page table are directly modified. Thus, the following 693b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky * hook is made available. 694b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky */ 695b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefskystatic inline void set_pte_at(struct mm_struct *mm, unsigned long addr, 696b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pte_t *ptep, pte_t entry) 697b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky{ 698b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pgste_t pgste; 699b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky 700b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky if (mm_has_pgste(mm)) { 701b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pgste = pgste_get_lock(ptep); 70209b538833b85521d937a06faf61e6a3273253cc0Martin Schwidefsky pgste_set_pte(ptep, pgste, entry); 703b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky *ptep = entry; 704b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pgste_set_unlock(ptep, pgste); 705b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky } else 706b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky *ptep = entry; 707b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky} 708b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky 709b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky/* 7101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * query functions pte_write/pte_dirty/pte_young only work if 7111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * pte_present() is true. Undefined behaviour if not.. 7121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 7134448aaf0faafff3f275d15937c28b6346760e028Adrian Bunkstatic inline int pte_write(pte_t pte) 7141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 7151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return (pte_val(pte) & _PAGE_RO) == 0; 7161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 7171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7184448aaf0faafff3f275d15937c28b6346760e028Adrian Bunkstatic inline int pte_dirty(pte_t pte) 7191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 720b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky#ifdef CONFIG_PGSTE 721b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky if (pte_val(pte) & _PAGE_SWC) 722b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky return 1; 723b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky#endif 7241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 7251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 7261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7274448aaf0faafff3f275d15937c28b6346760e028Adrian Bunkstatic inline int pte_young(pte_t pte) 7281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 729b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky#ifdef CONFIG_PGSTE 730b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky if (pte_val(pte) & _PAGE_SWR) 731b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky return 1; 732b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky#endif 7331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 7341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 7351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 7371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * pgd/pmd/pte modification functions 7381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 7391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 740b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefskystatic inline void pgd_clear(pgd_t *pgd) 7415a216a20837c5f5fa1ca4b8ae8991ffd96b08e6fMartin Schwidefsky{ 742f4815ac6c935b8e441fe12504d62e0e8ff7f7ce5Heiko Carstens#ifdef CONFIG_64BIT 7436252d702c5311ce916caf75ed82e5c8245171c92Martin Schwidefsky if ((pgd_val(*pgd) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R2) 7446252d702c5311ce916caf75ed82e5c8245171c92Martin Schwidefsky pgd_val(*pgd) = _REGION2_ENTRY_EMPTY; 745b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky#endif 7465a216a20837c5f5fa1ca4b8ae8991ffd96b08e6fMartin Schwidefsky} 7475a216a20837c5f5fa1ca4b8ae8991ffd96b08e6fMartin Schwidefsky 748b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefskystatic inline void pud_clear(pud_t *pud) 7491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 750f4815ac6c935b8e441fe12504d62e0e8ff7f7ce5Heiko Carstens#ifdef CONFIG_64BIT 7516252d702c5311ce916caf75ed82e5c8245171c92Martin Schwidefsky if ((pud_val(*pud) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3) 7526252d702c5311ce916caf75ed82e5c8245171c92Martin Schwidefsky pud_val(*pud) = _REGION3_ENTRY_EMPTY; 753b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky#endif 7541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 7551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 756b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefskystatic inline void pmd_clear(pmd_t *pmdp) 7571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 7583610cce87af0693603db171d5b6f6735f5e3dc5bMartin Schwidefsky pmd_val(*pmdp) = _SEGMENT_ENTRY_EMPTY; 7591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 7601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7614448aaf0faafff3f275d15937c28b6346760e028Adrian Bunkstatic inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) 7621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 7639282ed929758b82f448a40d3c17319d794970624Gerald Schaefer pte_val(*ptep) = _PAGE_TYPE_EMPTY; 7641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 7651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 7671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * The following pte modification functions only work if 7681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * pte_present() is true. Undefined behaviour if not.. 7691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 7704448aaf0faafff3f275d15937c28b6346760e028Adrian Bunkstatic inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 7711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 772138c9021ca68d6f8a6fac3418995fee102a3cc22Nick Piggin pte_val(pte) &= _PAGE_CHG_MASK; 7731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pte_val(pte) |= pgprot_val(newprot); 7741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return pte; 7751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 7761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7774448aaf0faafff3f275d15937c28b6346760e028Adrian Bunkstatic inline pte_t pte_wrprotect(pte_t pte) 7781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 7799282ed929758b82f448a40d3c17319d794970624Gerald Schaefer /* Do not clobber _PAGE_TYPE_NONE pages! */ 7801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!(pte_val(pte) & _PAGE_INVALID)) 7811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pte_val(pte) |= _PAGE_RO; 7821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return pte; 7831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 7841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7854448aaf0faafff3f275d15937c28b6346760e028Adrian Bunkstatic inline pte_t pte_mkwrite(pte_t pte) 7861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 7871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pte_val(pte) &= ~_PAGE_RO; 7881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return pte; 7891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 7901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7914448aaf0faafff3f275d15937c28b6346760e028Adrian Bunkstatic inline pte_t pte_mkclean(pte_t pte) 7921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 793b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky#ifdef CONFIG_PGSTE 794b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pte_val(pte) &= ~_PAGE_SWC; 795b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky#endif 7961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return pte; 7971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 7981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7994448aaf0faafff3f275d15937c28b6346760e028Adrian Bunkstatic inline pte_t pte_mkdirty(pte_t pte) 8001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 8011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return pte; 8021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 8031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8044448aaf0faafff3f275d15937c28b6346760e028Adrian Bunkstatic inline pte_t pte_mkold(pte_t pte) 8051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 806b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky#ifdef CONFIG_PGSTE 807b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pte_val(pte) &= ~_PAGE_SWR; 808b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky#endif 8091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return pte; 8101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 8111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8124448aaf0faafff3f275d15937c28b6346760e028Adrian Bunkstatic inline pte_t pte_mkyoung(pte_t pte) 8131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 8141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return pte; 8151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 8161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8177e675137a8e1a4d45822746456dd389b65745bf6Nick Pigginstatic inline pte_t pte_mkspecial(pte_t pte) 8187e675137a8e1a4d45822746456dd389b65745bf6Nick Piggin{ 819a08cb629f546d1cecebe955392197f226e58dbe1Nick Piggin pte_val(pte) |= _PAGE_SPECIAL; 8207e675137a8e1a4d45822746456dd389b65745bf6Nick Piggin return pte; 8217e675137a8e1a4d45822746456dd389b65745bf6Nick Piggin} 8227e675137a8e1a4d45822746456dd389b65745bf6Nick Piggin 82384afdcee620b1640f2a145c07febae4ed68947f9Heiko Carstens#ifdef CONFIG_HUGETLB_PAGE 82484afdcee620b1640f2a145c07febae4ed68947f9Heiko Carstensstatic inline pte_t pte_mkhuge(pte_t pte) 82584afdcee620b1640f2a145c07febae4ed68947f9Heiko Carstens{ 82684afdcee620b1640f2a145c07febae4ed68947f9Heiko Carstens /* 82784afdcee620b1640f2a145c07febae4ed68947f9Heiko Carstens * PROT_NONE needs to be remapped from the pte type to the ste type. 82884afdcee620b1640f2a145c07febae4ed68947f9Heiko Carstens * The HW invalid bit is also different for pte and ste. The pte 82984afdcee620b1640f2a145c07febae4ed68947f9Heiko Carstens * invalid bit happens to be the same as the ste _SEGMENT_ENTRY_LARGE 83084afdcee620b1640f2a145c07febae4ed68947f9Heiko Carstens * bit, so we don't have to clear it. 83184afdcee620b1640f2a145c07febae4ed68947f9Heiko Carstens */ 83284afdcee620b1640f2a145c07febae4ed68947f9Heiko Carstens if (pte_val(pte) & _PAGE_INVALID) { 83384afdcee620b1640f2a145c07febae4ed68947f9Heiko Carstens if (pte_val(pte) & _PAGE_SWT) 83484afdcee620b1640f2a145c07febae4ed68947f9Heiko Carstens pte_val(pte) |= _HPAGE_TYPE_NONE; 83584afdcee620b1640f2a145c07febae4ed68947f9Heiko Carstens pte_val(pte) |= _SEGMENT_ENTRY_INV; 83684afdcee620b1640f2a145c07febae4ed68947f9Heiko Carstens } 83784afdcee620b1640f2a145c07febae4ed68947f9Heiko Carstens /* 83884afdcee620b1640f2a145c07febae4ed68947f9Heiko Carstens * Clear SW pte bits SWT and SWX, there are no SW bits in a segment 83984afdcee620b1640f2a145c07febae4ed68947f9Heiko Carstens * table entry. 84084afdcee620b1640f2a145c07febae4ed68947f9Heiko Carstens */ 84184afdcee620b1640f2a145c07febae4ed68947f9Heiko Carstens pte_val(pte) &= ~(_PAGE_SWT | _PAGE_SWX); 84284afdcee620b1640f2a145c07febae4ed68947f9Heiko Carstens /* 84384afdcee620b1640f2a145c07febae4ed68947f9Heiko Carstens * Also set the change-override bit because we don't need dirty bit 84484afdcee620b1640f2a145c07febae4ed68947f9Heiko Carstens * tracking for hugetlbfs pages. 84584afdcee620b1640f2a145c07febae4ed68947f9Heiko Carstens */ 84684afdcee620b1640f2a145c07febae4ed68947f9Heiko Carstens pte_val(pte) |= (_SEGMENT_ENTRY_LARGE | _SEGMENT_ENTRY_CO); 84784afdcee620b1640f2a145c07febae4ed68947f9Heiko Carstens return pte; 84884afdcee620b1640f2a145c07febae4ed68947f9Heiko Carstens} 84984afdcee620b1640f2a145c07febae4ed68947f9Heiko Carstens#endif 85084afdcee620b1640f2a145c07febae4ed68947f9Heiko Carstens 85115e86b0c752d50e910b2cca6e83ce74c4440d06cFlorian Funke/* 852b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky * Get (and clear) the user dirty bit for a pte. 85315e86b0c752d50e910b2cca6e83ce74c4440d06cFlorian Funke */ 854b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefskystatic inline int ptep_test_and_clear_user_dirty(struct mm_struct *mm, 855b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pte_t *ptep) 85615e86b0c752d50e910b2cca6e83ce74c4440d06cFlorian Funke{ 857b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pgste_t pgste; 858b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky int dirty = 0; 859b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky 860b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky if (mm_has_pgste(mm)) { 861b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pgste = pgste_get_lock(ptep); 862b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pgste = pgste_update_all(ptep, pgste); 863b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky dirty = !!(pgste_val(pgste) & KVM_UC_BIT); 864b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pgste_val(pgste) &= ~KVM_UC_BIT; 865b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pgste_set_unlock(ptep, pgste); 866b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky return dirty; 86715e86b0c752d50e910b2cca6e83ce74c4440d06cFlorian Funke } 86815e86b0c752d50e910b2cca6e83ce74c4440d06cFlorian Funke return dirty; 86915e86b0c752d50e910b2cca6e83ce74c4440d06cFlorian Funke} 870b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky 871b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky/* 872b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky * Get (and clear) the user referenced bit for a pte. 873b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky */ 874b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefskystatic inline int ptep_test_and_clear_user_young(struct mm_struct *mm, 875b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pte_t *ptep) 876b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky{ 877b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pgste_t pgste; 878b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky int young = 0; 879b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky 880b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky if (mm_has_pgste(mm)) { 881b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pgste = pgste_get_lock(ptep); 882b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pgste = pgste_update_young(ptep, pgste); 883b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky young = !!(pgste_val(pgste) & KVM_UR_BIT); 884b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pgste_val(pgste) &= ~KVM_UR_BIT; 885b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pgste_set_unlock(ptep, pgste); 886b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky } 887b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky return young; 888b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky} 88915e86b0c752d50e910b2cca6e83ce74c4440d06cFlorian Funke 890ba8a9229ab9e80278c28ad68b15053f65b2b0a7cMartin Schwidefsky#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG 891ba8a9229ab9e80278c28ad68b15053f65b2b0a7cMartin Schwidefskystatic inline int ptep_test_and_clear_young(struct vm_area_struct *vma, 892ba8a9229ab9e80278c28ad68b15053f65b2b0a7cMartin Schwidefsky unsigned long addr, pte_t *ptep) 8931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 894b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pgste_t pgste; 895b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pte_t pte; 896b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky 897b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky if (mm_has_pgste(vma->vm_mm)) { 898b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pgste = pgste_get_lock(ptep); 899b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pgste = pgste_update_young(ptep, pgste); 900b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pte = *ptep; 901b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky *ptep = pte_mkold(pte); 902b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pgste_set_unlock(ptep, pgste); 903b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky return pte_young(pte); 904b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky } 9051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 9061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 9071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 908ba8a9229ab9e80278c28ad68b15053f65b2b0a7cMartin Schwidefsky#define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH 909ba8a9229ab9e80278c28ad68b15053f65b2b0a7cMartin Schwidefskystatic inline int ptep_clear_flush_young(struct vm_area_struct *vma, 910ba8a9229ab9e80278c28ad68b15053f65b2b0a7cMartin Schwidefsky unsigned long address, pte_t *ptep) 9111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 9125b7baf05783b1ac97a510243d7e82293416a7cf6Christian Borntraeger /* No need to flush TLB 9135b7baf05783b1ac97a510243d7e82293416a7cf6Christian Borntraeger * On s390 reference bits are in storage key and never in TLB 9145b7baf05783b1ac97a510243d7e82293416a7cf6Christian Borntraeger * With virtualization we handle the reference bit, without we 9155b7baf05783b1ac97a510243d7e82293416a7cf6Christian Borntraeger * we can simply return */ 9165b7baf05783b1ac97a510243d7e82293416a7cf6Christian Borntraeger return ptep_test_and_clear_young(vma, address, ptep); 9171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 9181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9199282ed929758b82f448a40d3c17319d794970624Gerald Schaeferstatic inline void __ptep_ipte(unsigned long address, pte_t *ptep) 9201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 9219282ed929758b82f448a40d3c17319d794970624Gerald Schaefer if (!(pte_val(*ptep) & _PAGE_INVALID)) { 922f4815ac6c935b8e441fe12504d62e0e8ff7f7ce5Heiko Carstens#ifndef CONFIG_64BIT 923146e4b3c8b92071b18f0b2e6f47165bad4f9e825Martin Schwidefsky /* pto must point to the start of the segment table */ 9241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pte_t *pto = (pte_t *) (((unsigned long) ptep) & 0x7ffffc00); 9259282ed929758b82f448a40d3c17319d794970624Gerald Schaefer#else 9269282ed929758b82f448a40d3c17319d794970624Gerald Schaefer /* ipte in zarch mode can do the math */ 9279282ed929758b82f448a40d3c17319d794970624Gerald Schaefer pte_t *pto = ptep; 9289282ed929758b82f448a40d3c17319d794970624Gerald Schaefer#endif 92994c12cc7d196bab34aaa98d38521549fa1e5ef76Martin Schwidefsky asm volatile( 93094c12cc7d196bab34aaa98d38521549fa1e5ef76Martin Schwidefsky " ipte %2,%3" 93194c12cc7d196bab34aaa98d38521549fa1e5ef76Martin Schwidefsky : "=m" (*ptep) : "m" (*ptep), 93294c12cc7d196bab34aaa98d38521549fa1e5ef76Martin Schwidefsky "a" (pto), "a" (address)); 9331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 9349282ed929758b82f448a40d3c17319d794970624Gerald Schaefer} 9359282ed929758b82f448a40d3c17319d794970624Gerald Schaefer 936ba8a9229ab9e80278c28ad68b15053f65b2b0a7cMartin Schwidefsky/* 937ba8a9229ab9e80278c28ad68b15053f65b2b0a7cMartin Schwidefsky * This is hard to understand. ptep_get_and_clear and ptep_clear_flush 938ba8a9229ab9e80278c28ad68b15053f65b2b0a7cMartin Schwidefsky * both clear the TLB for the unmapped pte. The reason is that 939ba8a9229ab9e80278c28ad68b15053f65b2b0a7cMartin Schwidefsky * ptep_get_and_clear is used in common code (e.g. change_pte_range) 940ba8a9229ab9e80278c28ad68b15053f65b2b0a7cMartin Schwidefsky * to modify an active pte. The sequence is 941ba8a9229ab9e80278c28ad68b15053f65b2b0a7cMartin Schwidefsky * 1) ptep_get_and_clear 942ba8a9229ab9e80278c28ad68b15053f65b2b0a7cMartin Schwidefsky * 2) set_pte_at 943ba8a9229ab9e80278c28ad68b15053f65b2b0a7cMartin Schwidefsky * 3) flush_tlb_range 944ba8a9229ab9e80278c28ad68b15053f65b2b0a7cMartin Schwidefsky * On s390 the tlb needs to get flushed with the modification of the pte 945ba8a9229ab9e80278c28ad68b15053f65b2b0a7cMartin Schwidefsky * if the pte is active. The only way how this can be implemented is to 946ba8a9229ab9e80278c28ad68b15053f65b2b0a7cMartin Schwidefsky * have ptep_get_and_clear do the tlb flush. In exchange flush_tlb_range 947ba8a9229ab9e80278c28ad68b15053f65b2b0a7cMartin Schwidefsky * is a nop. 948ba8a9229ab9e80278c28ad68b15053f65b2b0a7cMartin Schwidefsky */ 949ba8a9229ab9e80278c28ad68b15053f65b2b0a7cMartin Schwidefsky#define __HAVE_ARCH_PTEP_GET_AND_CLEAR 950b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefskystatic inline pte_t ptep_get_and_clear(struct mm_struct *mm, 951b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky unsigned long address, pte_t *ptep) 952b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky{ 953b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pgste_t pgste; 954b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pte_t pte; 955b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky 956b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky mm->context.flush_mm = 1; 957b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky if (mm_has_pgste(mm)) 958b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pgste = pgste_get_lock(ptep); 959b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky 960b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pte = *ptep; 961b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky if (!mm_exclusive(mm)) 962b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky __ptep_ipte(address, ptep); 963b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pte_val(*ptep) = _PAGE_TYPE_EMPTY; 964b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky 965b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky if (mm_has_pgste(mm)) { 966b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pgste = pgste_update_all(&pte, pgste); 967b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pgste_set_unlock(ptep, pgste); 968b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky } 969b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky return pte; 970b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky} 971b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky 972b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky#define __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION 973b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefskystatic inline pte_t ptep_modify_prot_start(struct mm_struct *mm, 974b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky unsigned long address, 975b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pte_t *ptep) 976b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky{ 977b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pte_t pte; 978b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky 979b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky mm->context.flush_mm = 1; 980b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky if (mm_has_pgste(mm)) 981b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pgste_get_lock(ptep); 982b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky 983b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pte = *ptep; 984b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky if (!mm_exclusive(mm)) 985b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky __ptep_ipte(address, ptep); 986b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky return pte; 987b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky} 988b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky 989b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefskystatic inline void ptep_modify_prot_commit(struct mm_struct *mm, 990b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky unsigned long address, 991b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pte_t *ptep, pte_t pte) 992b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky{ 993b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky *ptep = pte; 994b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky if (mm_has_pgste(mm)) 995b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pgste_set_unlock(ptep, *(pgste_t *)(ptep + PTRS_PER_PTE)); 996b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky} 997ba8a9229ab9e80278c28ad68b15053f65b2b0a7cMartin Schwidefsky 998ba8a9229ab9e80278c28ad68b15053f65b2b0a7cMartin Schwidefsky#define __HAVE_ARCH_PTEP_CLEAR_FLUSH 999f0e47c229b489e37ba7e4159ef7f9cf9ccd44e19Martin Schwidefskystatic inline pte_t ptep_clear_flush(struct vm_area_struct *vma, 1000f0e47c229b489e37ba7e4159ef7f9cf9ccd44e19Martin Schwidefsky unsigned long address, pte_t *ptep) 1001f0e47c229b489e37ba7e4159ef7f9cf9ccd44e19Martin Schwidefsky{ 1002b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pgste_t pgste; 1003b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pte_t pte; 1004b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky 1005b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky if (mm_has_pgste(vma->vm_mm)) 1006b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pgste = pgste_get_lock(ptep); 1007b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky 1008b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pte = *ptep; 1009b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky __ptep_ipte(address, ptep); 1010b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pte_val(*ptep) = _PAGE_TYPE_EMPTY; 1011b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky 1012b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky if (mm_has_pgste(vma->vm_mm)) { 1013b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pgste = pgste_update_all(&pte, pgste); 1014b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pgste_set_unlock(ptep, pgste); 1015b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky } 10161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return pte; 10171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 10181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1019ba8a9229ab9e80278c28ad68b15053f65b2b0a7cMartin Schwidefsky/* 1020ba8a9229ab9e80278c28ad68b15053f65b2b0a7cMartin Schwidefsky * The batched pte unmap code uses ptep_get_and_clear_full to clear the 1021ba8a9229ab9e80278c28ad68b15053f65b2b0a7cMartin Schwidefsky * ptes. Here an optimization is possible. tlb_gather_mmu flushes all 1022ba8a9229ab9e80278c28ad68b15053f65b2b0a7cMartin Schwidefsky * tlbs of an mm if it can guarantee that the ptes of the mm_struct 1023ba8a9229ab9e80278c28ad68b15053f65b2b0a7cMartin Schwidefsky * cannot be accessed while the batched unmap is running. In this case 1024ba8a9229ab9e80278c28ad68b15053f65b2b0a7cMartin Schwidefsky * full==1 and a simple pte_clear is enough. See tlb.h. 1025ba8a9229ab9e80278c28ad68b15053f65b2b0a7cMartin Schwidefsky */ 1026ba8a9229ab9e80278c28ad68b15053f65b2b0a7cMartin Schwidefsky#define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL 1027ba8a9229ab9e80278c28ad68b15053f65b2b0a7cMartin Schwidefskystatic inline pte_t ptep_get_and_clear_full(struct mm_struct *mm, 1028b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky unsigned long address, 1029ba8a9229ab9e80278c28ad68b15053f65b2b0a7cMartin Schwidefsky pte_t *ptep, int full) 10301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 1031b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pgste_t pgste; 1032b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pte_t pte; 1033b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky 1034b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky if (mm_has_pgste(mm)) 1035b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pgste = pgste_get_lock(ptep); 1036ba8a9229ab9e80278c28ad68b15053f65b2b0a7cMartin Schwidefsky 1037b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pte = *ptep; 1038b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky if (!full) 1039b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky __ptep_ipte(address, ptep); 1040b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pte_val(*ptep) = _PAGE_TYPE_EMPTY; 1041b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky 1042b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky if (mm_has_pgste(mm)) { 1043b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pgste = pgste_update_all(&pte, pgste); 1044b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pgste_set_unlock(ptep, pgste); 1045b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky } 1046ba8a9229ab9e80278c28ad68b15053f65b2b0a7cMartin Schwidefsky return pte; 10471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 10481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1049ba8a9229ab9e80278c28ad68b15053f65b2b0a7cMartin Schwidefsky#define __HAVE_ARCH_PTEP_SET_WRPROTECT 1050b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefskystatic inline pte_t ptep_set_wrprotect(struct mm_struct *mm, 1051b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky unsigned long address, pte_t *ptep) 1052b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky{ 1053b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pgste_t pgste; 1054b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pte_t pte = *ptep; 1055b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky 1056b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky if (pte_write(pte)) { 1057b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky mm->context.flush_mm = 1; 1058b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky if (mm_has_pgste(mm)) 1059b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pgste = pgste_get_lock(ptep); 1060b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky 1061b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky if (!mm_exclusive(mm)) 1062b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky __ptep_ipte(address, ptep); 1063b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky *ptep = pte_wrprotect(pte); 1064b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky 1065b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky if (mm_has_pgste(mm)) 1066b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pgste_set_unlock(ptep, pgste); 1067b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky } 1068b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky return pte; 1069b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky} 1070ba8a9229ab9e80278c28ad68b15053f65b2b0a7cMartin Schwidefsky 1071ba8a9229ab9e80278c28ad68b15053f65b2b0a7cMartin Schwidefsky#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS 1072b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefskystatic inline int ptep_set_access_flags(struct vm_area_struct *vma, 1073b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky unsigned long address, pte_t *ptep, 1074b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pte_t entry, int dirty) 1075b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky{ 1076b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pgste_t pgste; 1077b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky 1078b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky if (pte_same(*ptep, entry)) 1079b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky return 0; 1080b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky if (mm_has_pgste(vma->vm_mm)) 1081b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pgste = pgste_get_lock(ptep); 1082b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky 1083b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky __ptep_ipte(address, ptep); 1084b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky *ptep = entry; 1085b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky 1086b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky if (mm_has_pgste(vma->vm_mm)) 1087b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky pgste_set_unlock(ptep, pgste); 1088b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky return 1; 1089b2fa47e6bf5148aa6dbf22ec79f18141b421eebaMartin Schwidefsky} 10901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 10921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Conversion functions: convert a page and protection to a page entry, 10931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * and a page entry and page directory to the page they refer to. 10941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 10951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic inline pte_t mk_pte_phys(unsigned long physpage, pgprot_t pgprot) 10961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 10971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pte_t __pte; 10981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pte_val(__pte) = physpage + pgprot_val(pgprot); 10991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return __pte; 11001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 11011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11022dcea57ae19275451a756a2d5bf96b329487b0e0Heiko Carstensstatic inline pte_t mk_pte(struct page *page, pgprot_t pgprot) 11032dcea57ae19275451a756a2d5bf96b329487b0e0Heiko Carstens{ 11040b2b6e1ddce4696cb7afcbb15a654fe95428a498Heiko Carstens unsigned long physpage = page_to_phys(page); 11051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11062dcea57ae19275451a756a2d5bf96b329487b0e0Heiko Carstens return mk_pte_phys(physpage, pgprot); 11072dcea57ae19275451a756a2d5bf96b329487b0e0Heiko Carstens} 11082dcea57ae19275451a756a2d5bf96b329487b0e0Heiko Carstens 1109190a1d722a59725706daf832bc8a511ed62f249dMartin Schwidefsky#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1)) 1110190a1d722a59725706daf832bc8a511ed62f249dMartin Schwidefsky#define pud_index(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD-1)) 1111190a1d722a59725706daf832bc8a511ed62f249dMartin Schwidefsky#define pmd_index(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1)) 1112190a1d722a59725706daf832bc8a511ed62f249dMartin Schwidefsky#define pte_index(address) (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE-1)) 11131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1114190a1d722a59725706daf832bc8a511ed62f249dMartin Schwidefsky#define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address)) 1115190a1d722a59725706daf832bc8a511ed62f249dMartin Schwidefsky#define pgd_offset_k(address) pgd_offset(&init_mm, address) 11161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1117f4815ac6c935b8e441fe12504d62e0e8ff7f7ce5Heiko Carstens#ifndef CONFIG_64BIT 11181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1119190a1d722a59725706daf832bc8a511ed62f249dMartin Schwidefsky#define pmd_deref(pmd) (pmd_val(pmd) & _SEGMENT_ENTRY_ORIGIN) 1120190a1d722a59725706daf832bc8a511ed62f249dMartin Schwidefsky#define pud_deref(pmd) ({ BUG(); 0UL; }) 1121190a1d722a59725706daf832bc8a511ed62f249dMartin Schwidefsky#define pgd_deref(pmd) ({ BUG(); 0UL; }) 112246a82b2d5591335277ed2930611f6acb4ce654edDave McCracken 1123190a1d722a59725706daf832bc8a511ed62f249dMartin Schwidefsky#define pud_offset(pgd, address) ((pud_t *) pgd) 1124190a1d722a59725706daf832bc8a511ed62f249dMartin Schwidefsky#define pmd_offset(pud, address) ((pmd_t *) pud + pmd_index(address)) 11251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1126f4815ac6c935b8e441fe12504d62e0e8ff7f7ce5Heiko Carstens#else /* CONFIG_64BIT */ 11271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1128190a1d722a59725706daf832bc8a511ed62f249dMartin Schwidefsky#define pmd_deref(pmd) (pmd_val(pmd) & _SEGMENT_ENTRY_ORIGIN) 1129190a1d722a59725706daf832bc8a511ed62f249dMartin Schwidefsky#define pud_deref(pud) (pud_val(pud) & _REGION_ENTRY_ORIGIN) 11305a216a20837c5f5fa1ca4b8ae8991ffd96b08e6fMartin Schwidefsky#define pgd_deref(pgd) (pgd_val(pgd) & _REGION_ENTRY_ORIGIN) 11311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11325a216a20837c5f5fa1ca4b8ae8991ffd96b08e6fMartin Schwidefskystatic inline pud_t *pud_offset(pgd_t *pgd, unsigned long address) 11335a216a20837c5f5fa1ca4b8ae8991ffd96b08e6fMartin Schwidefsky{ 11346252d702c5311ce916caf75ed82e5c8245171c92Martin Schwidefsky pud_t *pud = (pud_t *) pgd; 11356252d702c5311ce916caf75ed82e5c8245171c92Martin Schwidefsky if ((pgd_val(*pgd) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R2) 11366252d702c5311ce916caf75ed82e5c8245171c92Martin Schwidefsky pud = (pud_t *) pgd_deref(*pgd); 11375a216a20837c5f5fa1ca4b8ae8991ffd96b08e6fMartin Schwidefsky return pud + pud_index(address); 11385a216a20837c5f5fa1ca4b8ae8991ffd96b08e6fMartin Schwidefsky} 11391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1140190a1d722a59725706daf832bc8a511ed62f249dMartin Schwidefskystatic inline pmd_t *pmd_offset(pud_t *pud, unsigned long address) 11411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 11426252d702c5311ce916caf75ed82e5c8245171c92Martin Schwidefsky pmd_t *pmd = (pmd_t *) pud; 11436252d702c5311ce916caf75ed82e5c8245171c92Martin Schwidefsky if ((pud_val(*pud) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3) 11446252d702c5311ce916caf75ed82e5c8245171c92Martin Schwidefsky pmd = (pmd_t *) pud_deref(*pud); 1145190a1d722a59725706daf832bc8a511ed62f249dMartin Schwidefsky return pmd + pmd_index(address); 11461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 11471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1148f4815ac6c935b8e441fe12504d62e0e8ff7f7ce5Heiko Carstens#endif /* CONFIG_64BIT */ 11491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1150190a1d722a59725706daf832bc8a511ed62f249dMartin Schwidefsky#define pfn_pte(pfn,pgprot) mk_pte_phys(__pa((pfn) << PAGE_SHIFT),(pgprot)) 1151190a1d722a59725706daf832bc8a511ed62f249dMartin Schwidefsky#define pte_pfn(x) (pte_val(x) >> PAGE_SHIFT) 1152190a1d722a59725706daf832bc8a511ed62f249dMartin Schwidefsky#define pte_page(x) pfn_to_page(pte_pfn(x)) 11531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1154190a1d722a59725706daf832bc8a511ed62f249dMartin Schwidefsky#define pmd_page(pmd) pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT) 11551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1156190a1d722a59725706daf832bc8a511ed62f249dMartin Schwidefsky/* Find an entry in the lowest level page table.. */ 1157190a1d722a59725706daf832bc8a511ed62f249dMartin Schwidefsky#define pte_offset(pmd, addr) ((pte_t *) pmd_deref(*(pmd)) + pte_index(addr)) 1158190a1d722a59725706daf832bc8a511ed62f249dMartin Schwidefsky#define pte_offset_kernel(pmd, address) pte_offset(pmd,address) 11591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define pte_offset_map(pmd, address) pte_offset_kernel(pmd, address) 11601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define pte_unmap(pte) do { } while (0) 11611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 11631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 31 bit swap entry format: 11641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * A page-table entry has some bits we have to treat in a special way. 11651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Bits 0, 20 and bit 23 have to be zero, otherwise an specification 11661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * exception will occur instead of a page translation exception. The 11671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * specifiation exception has the bad habit not to store necessary 11681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * information in the lowcore. 11691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Bit 21 and bit 22 are the page invalid bit and the page protection 11701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * bit. We set both to indicate a swapped page. 11711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Bit 30 and 31 are used to distinguish the different page types. For 11721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * a swapped page these bits need to be zero. 11731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * This leaves the bits 1-19 and bits 24-29 to store type and offset. 11741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * We use the 5 bits from 25-29 for the type and the 20 bits from 1-19 11751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * plus 24 for the offset. 11761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 0| offset |0110|o|type |00| 11771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 0 0000000001111111111 2222 2 22222 33 11781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 0 1234567890123456789 0123 4 56789 01 11791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 11801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 64 bit swap entry format: 11811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * A page-table entry has some bits we have to treat in a special way. 11821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Bits 52 and bit 55 have to be zero, otherwise an specification 11831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * exception will occur instead of a page translation exception. The 11841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * specifiation exception has the bad habit not to store necessary 11851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * information in the lowcore. 11861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Bit 53 and bit 54 are the page invalid bit and the page protection 11871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * bit. We set both to indicate a swapped page. 11881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Bit 62 and 63 are used to distinguish the different page types. For 11891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * a swapped page these bits need to be zero. 11901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * This leaves the bits 0-51 and bits 56-61 to store type and offset. 11911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * We use the 5 bits from 57-61 for the type and the 53 bits from 0-51 11921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * plus 56 for the offset. 11931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * | offset |0110|o|type |00| 11941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 0000000000111111111122222222223333333333444444444455 5555 5 55566 66 11951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 0123456789012345678901234567890123456789012345678901 2345 6 78901 23 11961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 1197f4815ac6c935b8e441fe12504d62e0e8ff7f7ce5Heiko Carstens#ifndef CONFIG_64BIT 11981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define __SWP_OFFSET_MASK (~0UL >> 12) 11991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#else 12001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define __SWP_OFFSET_MASK (~0UL >> 11) 12011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 12024448aaf0faafff3f275d15937c28b6346760e028Adrian Bunkstatic inline pte_t mk_swap_pte(unsigned long type, unsigned long offset) 12031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 12041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pte_t pte; 12051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds offset &= __SWP_OFFSET_MASK; 12069282ed929758b82f448a40d3c17319d794970624Gerald Schaefer pte_val(pte) = _PAGE_TYPE_SWAP | ((type & 0x1f) << 2) | 12071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ((offset & 1UL) << 7) | ((offset & ~1UL) << 11); 12081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return pte; 12091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 12101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define __swp_type(entry) (((entry).val >> 2) & 0x1f) 12121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define __swp_offset(entry) (((entry).val >> 11) | (((entry).val >> 7) & 1)) 12131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define __swp_entry(type,offset) ((swp_entry_t) { pte_val(mk_swap_pte((type),(offset))) }) 12141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) 12161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define __swp_entry_to_pte(x) ((pte_t) { (x).val }) 12171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1218f4815ac6c935b8e441fe12504d62e0e8ff7f7ce5Heiko Carstens#ifndef CONFIG_64BIT 12191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds# define PTE_FILE_MAX_BITS 26 1220f4815ac6c935b8e441fe12504d62e0e8ff7f7ce5Heiko Carstens#else /* CONFIG_64BIT */ 12211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds# define PTE_FILE_MAX_BITS 59 1222f4815ac6c935b8e441fe12504d62e0e8ff7f7ce5Heiko Carstens#endif /* CONFIG_64BIT */ 12231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define pte_to_pgoff(__pte) \ 12251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ((((__pte).pte >> 12) << 7) + (((__pte).pte >> 1) & 0x7f)) 12261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define pgoff_to_pte(__off) \ 12281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ((pte_t) { ((((__off) & 0x7f) << 1) + (((__off) >> 7) << 12)) \ 12299282ed929758b82f448a40d3c17319d794970624Gerald Schaefer | _PAGE_TYPE_FILE }) 12301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif /* !__ASSEMBLY__ */ 12321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define kern_addr_valid(addr) (1) 12341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 123517f345808563d2f425b2b15d60c4a5b00112e9ebHeiko Carstensextern int vmem_add_mapping(unsigned long start, unsigned long size); 123617f345808563d2f425b2b15d60c4a5b00112e9ebHeiko Carstensextern int vmem_remove_mapping(unsigned long start, unsigned long size); 1237402b08622d9ac6e32e25289573272e0f21bb58a7Carsten Otteextern int s390_enable_sie(void); 1238f4eb07c17df2e6cf9bd58bfcd9cc9e05e9489d07Heiko Carstens 12391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 12401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * No page table caches to initialise 12411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 12421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define pgtable_cache_init() do { } while (0) 12431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <asm-generic/pgtable.h> 12451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif /* _S390_PAGE_H */ 1247