1a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/* 2a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * Page table support for the Hexagon architecture 3a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * 4e1858b2a21cd84a855945a4747fb2db41b250c22Richard Kuo * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved. 5a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * 6a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * This program is free software; you can redistribute it and/or modify 7a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * it under the terms of the GNU General Public License version 2 and 8a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * only version 2 as published by the Free Software Foundation. 9a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * 10a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * This program is distributed in the hope that it will be useful, 11a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * but WITHOUT ANY WARRANTY; without even the implied warranty of 12a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * GNU General Public License for more details. 14a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * 15a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * You should have received a copy of the GNU General Public License 16a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * along with this program; if not, write to the Free Software 17a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 18a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * 02110-1301, USA. 19a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo */ 20a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 21a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#ifndef _ASM_PGTABLE_H 22a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define _ASM_PGTABLE_H 23a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 24a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/* 25a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * Page table definitions for Qualcomm Hexagon processor. 26a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo */ 27a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#include <linux/swap.h> 28a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#include <asm/page.h> 29a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#include <asm-generic/pgtable-nopmd.h> 30a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 31a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/* A handy thing to have if one has the RAM. Declared in head.S */ 32a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuoextern unsigned long empty_zero_page; 33a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuoextern unsigned long zero_page_mask; 34a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 35a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/* 36a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * The PTE model described here is that of the Hexagon Virtual Machine, 37a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * which autonomously walks 2-level page tables. At a lower level, we 38a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * also describe the RISCish software-loaded TLB entry structure of 39a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * the underlying Hexagon processor. A kernel built to run on the 40a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * virtual machine has no need to know about the underlying hardware. 41a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo */ 42a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#include <asm/vm_mmu.h> 43a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 44a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/* 45a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * To maximize the comfort level for the PTE manipulation macros, 46a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * define the "well known" architecture-specific bits. 47a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo */ 48a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define _PAGE_READ __HVM_PTE_R 49a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define _PAGE_WRITE __HVM_PTE_W 50a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define _PAGE_EXECUTE __HVM_PTE_X 51a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define _PAGE_USER __HVM_PTE_U 52a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 53a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/* 54a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * We have a total of 4 "soft" bits available in the abstract PTE. 55a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * The two mandatory software bits are Dirty and Accessed. 56a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * To make nonlinear swap work according to the more recent 57a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * model, we want a low order "Present" bit to indicate whether 58a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * the PTE describes MMU programming or swap space. 59a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo */ 60a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define _PAGE_PRESENT (1<<0) 61a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define _PAGE_DIRTY (1<<1) 62a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define _PAGE_ACCESSED (1<<2) 63a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 64a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/* 65a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * _PAGE_FILE is only meaningful if _PAGE_PRESENT is false, while 66a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * _PAGE_DIRTY is only meaningful if _PAGE_PRESENT is true. 67a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * So we can overload the bit... 68a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo */ 69a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define _PAGE_FILE _PAGE_DIRTY /* set: pagecache, unset = swap */ 70a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 71a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/* 72a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * For now, let's say that Valid and Present are the same thing. 73a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * Alternatively, we could say that it's the "or" of R, W, and X 74a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * permissions. 75a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo */ 76a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define _PAGE_VALID _PAGE_PRESENT 77a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 78a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/* 79a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * We're not defining _PAGE_GLOBAL here, since there's no concept 80a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * of global pages or ASIDs exposed to the Hexagon Virtual Machine, 81a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * and we want to use the same page table structures and macros in 82a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * the native kernel as we do in the virtual machine kernel. 83a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * So we'll put up with a bit of inefficiency for now... 84a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo */ 85a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 86a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/* 87a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * Top "FOURTH" level (pgd), which for the Hexagon VM is really 88a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * only the second from the bottom, pgd and pud both being collapsed. 89a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * Each entry represents 4MB of virtual address space, 4K of table 90a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * thus maps the full 4GB. 91a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo */ 92a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define PGDIR_SHIFT 22 93a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define PTRS_PER_PGD 1024 94a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 95a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define PGDIR_SIZE (1UL << PGDIR_SHIFT) 96a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define PGDIR_MASK (~(PGDIR_SIZE-1)) 97a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 98a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#ifdef CONFIG_PAGE_SIZE_4KB 99a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define PTRS_PER_PTE 1024 100a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#endif 101a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 102a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#ifdef CONFIG_PAGE_SIZE_16KB 103a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define PTRS_PER_PTE 256 104a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#endif 105a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 106a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#ifdef CONFIG_PAGE_SIZE_64KB 107a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define PTRS_PER_PTE 64 108a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#endif 109a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 110a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#ifdef CONFIG_PAGE_SIZE_256KB 111a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define PTRS_PER_PTE 16 112a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#endif 113a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 114a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#ifdef CONFIG_PAGE_SIZE_1MB 115a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define PTRS_PER_PTE 4 116a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#endif 117a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 118a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/* Any bigger and the PTE disappears. */ 119a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define pgd_ERROR(e) \ 120a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo printk(KERN_ERR "%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__,\ 121a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo pgd_val(e)) 122a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 123a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/* 124a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * Page Protection Constants. Includes (in this variant) cache attributes. 125a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo */ 126a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuoextern unsigned long _dflt_cache_att; 127a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 128a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define PAGE_NONE __pgprot(_PAGE_PRESENT | _PAGE_USER | \ 129a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo _dflt_cache_att) 130a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | \ 131a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo _PAGE_READ | _PAGE_EXECUTE | _dflt_cache_att) 132a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define PAGE_COPY PAGE_READONLY 133a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define PAGE_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | \ 134a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo _PAGE_READ | _PAGE_EXECUTE | _dflt_cache_att) 135a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define PAGE_COPY_EXEC PAGE_EXEC 136a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_READ | \ 137a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo _PAGE_EXECUTE | _PAGE_WRITE | _dflt_cache_att) 138a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_READ | \ 139a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo _PAGE_WRITE | _PAGE_EXECUTE | _dflt_cache_att) 140a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 141a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 142a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/* 143a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * Aliases for mapping mmap() protection bits to page protections. 144a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * These get used for static initialization, so using the _dflt_cache_att 145a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * variable for the default cache attribute isn't workable. If the 146a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * default gets changed at boot time, the boot option code has to 147a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * update data structures like the protaction_map[] array. 148a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo */ 149a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define CACHEDEF (CACHE_DEFAULT << 6) 150a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 151a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/* Private (copy-on-write) page protections. */ 152a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define __P000 __pgprot(_PAGE_PRESENT | _PAGE_USER | CACHEDEF) 153a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define __P001 __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_READ | CACHEDEF) 154a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define __P010 __P000 /* Write-only copy-on-write */ 155a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define __P011 __P001 /* Read/Write copy-on-write */ 156a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define __P100 __pgprot(_PAGE_PRESENT | _PAGE_USER | \ 157a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo _PAGE_EXECUTE | CACHEDEF) 158a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define __P101 __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_EXECUTE | \ 159a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo _PAGE_READ | CACHEDEF) 160a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define __P110 __P100 /* Write/execute copy-on-write */ 161a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define __P111 __P101 /* Read/Write/Execute, copy-on-write */ 162a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 163a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/* Shared page protections. */ 164a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define __S000 __P000 165a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define __S001 __P001 166a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define __S010 __pgprot(_PAGE_PRESENT | _PAGE_USER | \ 167a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo _PAGE_WRITE | CACHEDEF) 168a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define __S011 __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_READ | \ 169a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo _PAGE_WRITE | CACHEDEF) 170a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define __S100 __pgprot(_PAGE_PRESENT | _PAGE_USER | \ 171a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo _PAGE_EXECUTE | CACHEDEF) 172a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define __S101 __P101 173a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define __S110 __pgprot(_PAGE_PRESENT | _PAGE_USER | \ 174a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo _PAGE_EXECUTE | _PAGE_WRITE | CACHEDEF) 175a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define __S111 __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_READ | \ 176a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo _PAGE_EXECUTE | _PAGE_WRITE | CACHEDEF) 177a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 178a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuoextern pgd_t swapper_pg_dir[PTRS_PER_PGD]; /* located in head.S */ 179a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 180a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/* Seems to be zero even in architectures where the zero page is firewalled? */ 181a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define FIRST_USER_ADDRESS 0 182a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define pte_special(pte) 0 183a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define pte_mkspecial(pte) (pte) 184a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 185a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/* HUGETLB not working currently */ 186a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#ifdef CONFIG_HUGETLB_PAGE 187a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define pte_mkhuge(pte) __pte((pte_val(pte) & ~0x3) | HVM_HUGEPAGE_SIZE) 188a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#endif 189a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 190a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/* 191a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * For now, assume that higher-level code will do TLB/MMU invalidations 192a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * and don't insert that overhead into this low-level function. 193a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo */ 194a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuoextern void sync_icache_dcache(pte_t pte); 195a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 196a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define pte_present_exec_user(pte) \ 197a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo ((pte_val(pte) & (_PAGE_EXECUTE | _PAGE_USER)) == \ 198a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo (_PAGE_EXECUTE | _PAGE_USER)) 199a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 200a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuostatic inline void set_pte(pte_t *ptep, pte_t pteval) 201a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo{ 202a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo /* should really be using pte_exec, if it weren't declared later. */ 203a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo if (pte_present_exec_user(pteval)) 204a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo sync_icache_dcache(pteval); 205a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 206a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo *ptep = pteval; 207a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo} 208a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 209a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/* 210a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * For the Hexagon Virtual Machine MMU (or its emulation), a null/invalid 211a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * L1 PTE (PMD/PGD) has 7 in the least significant bits. For the L2 PTE 212a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * (Linux PTE), the key is to have bits 11..9 all zero. We'd use 0x7 213a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * as a universal null entry, but some of those least significant bits 214a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * are interpreted by software. 215a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo */ 216a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define _NULL_PMD 0x7 217a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define _NULL_PTE 0x0 218a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 219a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuostatic inline void pmd_clear(pmd_t *pmd_entry_ptr) 220a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo{ 221a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo pmd_val(*pmd_entry_ptr) = _NULL_PMD; 222a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo} 223a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 224a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/* 225a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * Conveniently, a null PTE value is invalid. 226a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo */ 227a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuostatic inline void pte_clear(struct mm_struct *mm, unsigned long addr, 228a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo pte_t *ptep) 229a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo{ 230a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo pte_val(*ptep) = _NULL_PTE; 231a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo} 232a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 233a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#ifdef NEED_PMD_INDEX_DESPITE_BEING_2_LEVEL 234a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/** 235a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * pmd_index - returns the index of the entry in the PMD page 236a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * which would control the given virtual address 237a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo */ 238a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define pmd_index(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1)) 239a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 240a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#endif 241a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 242a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/** 243a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * pgd_index - returns the index of the entry in the PGD page 244a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * which would control the given virtual address 245a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * 246a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * This returns the *index* for the address in the pgd_t 247a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo */ 248a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1)) 249a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 250a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/* 251a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * pgd_offset - find an offset in a page-table-directory 252a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo */ 253a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define pgd_offset(mm, addr) ((mm)->pgd + pgd_index(addr)) 254a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 255a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/* 256a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * pgd_offset_k - get kernel (init_mm) pgd entry pointer for addr 257a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo */ 258a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define pgd_offset_k(address) pgd_offset(&init_mm, address) 259a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 260a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/** 261a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * pmd_none - check if pmd_entry is mapped 262a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * @pmd_entry: pmd entry 263a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * 264a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * MIPS checks it against that "invalid pte table" thing. 265a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo */ 266a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuostatic inline int pmd_none(pmd_t pmd) 267a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo{ 268a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo return pmd_val(pmd) == _NULL_PMD; 269a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo} 270a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 271a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/** 272a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * pmd_present - is there a page table behind this? 273a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * Essentially the inverse of pmd_none. We maybe 274a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * save an inline instruction by defining it this 275a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * way, instead of simply "!pmd_none". 276a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo */ 277a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuostatic inline int pmd_present(pmd_t pmd) 278a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo{ 279a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo return pmd_val(pmd) != (unsigned long)_NULL_PMD; 280a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo} 281a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 282a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/** 283a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * pmd_bad - check if a PMD entry is "bad". That might mean swapped out. 284a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * As we have no known cause of badness, it's null, as it is for many 285a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * architectures. 286a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo */ 287a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuostatic inline int pmd_bad(pmd_t pmd) 288a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo{ 289a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo return 0; 290a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo} 291a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 292a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/* 293a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * pmd_page - converts a PMD entry to a page pointer 294a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo */ 295a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define pmd_page(pmd) (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT)) 296a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define pmd_pgtable(pmd) pmd_page(pmd) 297a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 298a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/** 299a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * pte_none - check if pte is mapped 300a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * @pte: pte_t entry 301a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo */ 302a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuostatic inline int pte_none(pte_t pte) 303a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo{ 304a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo return pte_val(pte) == _NULL_PTE; 305a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo}; 306a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 307a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/* 308a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * pte_present - check if page is present 309a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo */ 310a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuostatic inline int pte_present(pte_t pte) 311a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo{ 312a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo return pte_val(pte) & _PAGE_PRESENT; 313a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo} 314a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 315a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/* mk_pte - make a PTE out of a page pointer and protection bits */ 316a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) 317a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 318a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/* pte_page - returns a page (frame pointer/descriptor?) based on a PTE */ 319a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define pte_page(x) pfn_to_page(pte_pfn(x)) 320a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 321a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/* pte_mkold - mark PTE as not recently accessed */ 322a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuostatic inline pte_t pte_mkold(pte_t pte) 323a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo{ 324a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo pte_val(pte) &= ~_PAGE_ACCESSED; 325a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo return pte; 326a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo} 327a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 328a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/* pte_mkyoung - mark PTE as recently accessed */ 329a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuostatic inline pte_t pte_mkyoung(pte_t pte) 330a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo{ 331a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo pte_val(pte) |= _PAGE_ACCESSED; 332a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo return pte; 333a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo} 334a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 335a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/* pte_mkclean - mark page as in sync with backing store */ 336a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuostatic inline pte_t pte_mkclean(pte_t pte) 337a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo{ 338a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo pte_val(pte) &= ~_PAGE_DIRTY; 339a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo return pte; 340a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo} 341a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 342a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/* pte_mkdirty - mark page as modified */ 343a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuostatic inline pte_t pte_mkdirty(pte_t pte) 344a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo{ 345a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo pte_val(pte) |= _PAGE_DIRTY; 346a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo return pte; 347a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo} 348a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 349a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/* pte_young - "is PTE marked as accessed"? */ 350a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuostatic inline int pte_young(pte_t pte) 351a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo{ 352a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo return pte_val(pte) & _PAGE_ACCESSED; 353a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo} 354a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 355a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/* pte_dirty - "is PTE dirty?" */ 356a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuostatic inline int pte_dirty(pte_t pte) 357a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo{ 358a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo return pte_val(pte) & _PAGE_DIRTY; 359a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo} 360a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 361a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/* pte_modify - set protection bits on PTE */ 362a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuostatic inline pte_t pte_modify(pte_t pte, pgprot_t prot) 363a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo{ 364a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo pte_val(pte) &= PAGE_MASK; 365a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo pte_val(pte) |= pgprot_val(prot); 366a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo return pte; 367a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo} 368a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 369a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/* pte_wrprotect - mark page as not writable */ 370a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuostatic inline pte_t pte_wrprotect(pte_t pte) 371a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo{ 372a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo pte_val(pte) &= ~_PAGE_WRITE; 373a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo return pte; 374a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo} 375a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 376a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/* pte_mkwrite - mark page as writable */ 377a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuostatic inline pte_t pte_mkwrite(pte_t pte) 378a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo{ 379a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo pte_val(pte) |= _PAGE_WRITE; 380a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo return pte; 381a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo} 382a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 383a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/* pte_mkexec - mark PTE as executable */ 384a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuostatic inline pte_t pte_mkexec(pte_t pte) 385a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo{ 386a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo pte_val(pte) |= _PAGE_EXECUTE; 387a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo return pte; 388a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo} 389a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 390a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/* pte_read - "is PTE marked as readable?" */ 391a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuostatic inline int pte_read(pte_t pte) 392a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo{ 393a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo return pte_val(pte) & _PAGE_READ; 394a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo} 395a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 396a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/* pte_write - "is PTE marked as writable?" */ 397a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuostatic inline int pte_write(pte_t pte) 398a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo{ 399a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo return pte_val(pte) & _PAGE_WRITE; 400a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo} 401a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 402a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 403a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/* pte_exec - "is PTE marked as executable?" */ 404a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuostatic inline int pte_exec(pte_t pte) 405a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo{ 406a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo return pte_val(pte) & _PAGE_EXECUTE; 407a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo} 408a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 409a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/* __pte_to_swp_entry - extract swap entry from PTE */ 410a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) 411a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 412a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/* __swp_entry_to_pte - extract PTE from swap entry */ 413a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define __swp_entry_to_pte(x) ((pte_t) { (x).val }) 414a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 415a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/* pfn_pte - convert page number and protection value to page table entry */ 416a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define pfn_pte(pfn, pgprot) __pte((pfn << PAGE_SHIFT) | pgprot_val(pgprot)) 417a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 418a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/* pte_pfn - convert pte to page frame number */ 419a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define pte_pfn(pte) (pte_val(pte) >> PAGE_SHIFT) 420a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval)) 421a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 422a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/* 423a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * set_pte_at - update page table and do whatever magic may be 424a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * necessary to make the underlying hardware/firmware take note. 425a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * 426a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * VM may require a virtual instruction to alert the MMU. 427a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo */ 428a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define set_pte_at(mm, addr, ptep, pte) set_pte(ptep, pte) 429a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 430a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/* 431a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * May need to invoke the virtual machine as well... 432a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo */ 433a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define pte_unmap(pte) do { } while (0) 434a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define pte_unmap_nested(pte) do { } while (0) 435a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 436a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/* 437a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * pte_offset_map - returns the linear address of the page table entry 438a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * corresponding to an address 439a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo */ 440a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define pte_offset_map(dir, address) \ 441a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo ((pte_t *)page_address(pmd_page(*(dir))) + __pte_offset(address)) 442a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 443a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define pte_offset_map_nested(pmd, addr) pte_offset_map(pmd, addr) 444a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 445a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/* pte_offset_kernel - kernel version of pte_offset */ 446a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define pte_offset_kernel(dir, address) \ 447a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo ((pte_t *) (unsigned long) __va(pmd_val(*dir) & PAGE_MASK) \ 448a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo + __pte_offset(address)) 449a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 450a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/* ZERO_PAGE - returns the globally shared zero page */ 451a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define ZERO_PAGE(vaddr) (virt_to_page(&empty_zero_page)) 452a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 453a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define __pte_offset(address) (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) 454a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 455a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/* I think this is in case we have page table caches; needed by init/main.c */ 456a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define pgtable_cache_init() do { } while (0) 457a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 458a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/* 459a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * Swap/file PTE definitions. If _PAGE_PRESENT is zero, the rest of the 460a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * PTE is interpreted as swap information. Depending on the _PAGE_FILE 461a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * bit, the remaining free bits are eitehr interpreted as a file offset 462a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * or a swap type/offset tuple. Rather than have the TLB fill handler 463a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * test _PAGE_PRESENT, we're going to reserve the permissions bits 464a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * and set them to all zeros for swap entries, which speeds up the 465a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * miss handler at the cost of 3 bits of offset. That trade-off can 466a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * be revisited if necessary, but Hexagon processor architecture and 467a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * target applications suggest a lot of TLB misses and not much swap space. 468a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * 469a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * Format of swap PTE: 470a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * bit 0: Present (zero) 471a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * bit 1: _PAGE_FILE (zero) 472a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * bits 2-6: swap type (arch independent layer uses 5 bits max) 473a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * bits 7-9: bits 2:0 of offset 474a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * bits 10-12: effectively _PAGE_PROTNONE (all zero) 475a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * bits 13-31: bits 21:3 of swap offset 476a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * 477a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * Format of file PTE: 478a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * bit 0: Present (zero) 479a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * bit 1: _PAGE_FILE (zero) 480a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * bits 2-9: bits 7:0 of offset 481a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * bits 10-12: effectively _PAGE_PROTNONE (all zero) 482a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * bits 13-31: bits 26:8 of swap offset 483a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * 484a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * The split offset makes some of the following macros a little gnarly, 485a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo * but there's plenty of precedent for this sort of thing. 486a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo */ 487a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define PTE_FILE_MAX_BITS 27 488a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 489a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/* Used for swap PTEs */ 490a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define __swp_type(swp_pte) (((swp_pte).val >> 2) & 0x1f) 491a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 492a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define __swp_offset(swp_pte) \ 493a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo ((((swp_pte).val >> 7) & 0x7) | (((swp_pte).val >> 10) & 0x003ffff8)) 494a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 495a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define __swp_entry(type, offset) \ 496a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo ((swp_entry_t) { \ 497a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo ((type << 2) | \ 498a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo ((offset & 0x3ffff8) << 10) | ((offset & 0x7) << 7)) }) 499a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 500a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/* Used for file PTEs */ 501a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define pte_file(pte) \ 502a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo ((pte_val(pte) & (_PAGE_FILE | _PAGE_PRESENT)) == _PAGE_FILE) 503a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 504a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define pte_to_pgoff(pte) \ 505a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo (((pte_val(pte) >> 2) & 0xff) | ((pte_val(pte) >> 5) & 0x07ffff00)) 506a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 507a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#define pgoff_to_pte(off) \ 508a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo ((pte_t) { ((((off) & 0x7ffff00) << 5) | (((off) & 0xff) << 2)\ 509a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo | _PAGE_FILE) }) 510a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 511a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo/* Oh boy. There are a lot of possible arch overrides found in this file. */ 512a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#include <asm-generic/pgtable.h> 513a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo 514a7e79840991eac8da36f437c653ee4b8cfbdafdcRichard Kuo#endif 515