pgtable_32.c revision 920573bd03bf690135967b5022362d34ede589c3
114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras/* 214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * This file contains the routines setting up the linux page tables. 314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * -- paulus 414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * 514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * Derived from arch/ppc/mm/init.c: 614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) 714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * 814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au) 914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * and Cort Dougan (PReP) (cort@cs.nmt.edu) 1014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * Copyright (C) 1996 Paul Mackerras 1114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * Amiga/APUS changes by Jesper Skov (jskov@cygnus.co.uk). 1214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * 1314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * Derived from "arch/i386/mm/init.c" 1414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds 1514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * 1614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * This program is free software; you can redistribute it and/or 1714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * modify it under the terms of the GNU General Public License 1814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * as published by the Free Software Foundation; either version 1914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * 2 of the License, or (at your option) any later version. 2014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * 2114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras */ 2214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 2314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#include <linux/config.h> 2414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#include <linux/kernel.h> 2514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#include <linux/module.h> 2614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#include <linux/types.h> 2714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#include <linux/mm.h> 2814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#include <linux/vmalloc.h> 2914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#include <linux/init.h> 3014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#include <linux/highmem.h> 3114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 3214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#include <asm/pgtable.h> 3314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#include <asm/pgalloc.h> 3414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#include <asm/io.h> 3514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 3614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#include "mmu_decl.h" 3714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 3814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerrasunsigned long ioremap_base; 3914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerrasunsigned long ioremap_bot; 40920573bd03bf690135967b5022362d34ede589c3Olaf HeringEXPORT_SYMBOL(ioremap_bot); /* aka VMALLOC_END */ 4114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerrasint io_bat_index; 4214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 4314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#if defined(CONFIG_6xx) || defined(CONFIG_POWER3) 4414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#define HAVE_BATS 1 4514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#endif 4614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 4714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#if defined(CONFIG_FSL_BOOKE) 4814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#define HAVE_TLBCAM 1 4914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#endif 5014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 5114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerrasextern char etext[], _stext[]; 5214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 5314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#ifdef CONFIG_SMP 5414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerrasextern void hash_page_sync(void); 5514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#endif 5614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 5714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#ifdef HAVE_BATS 5814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerrasextern unsigned long v_mapped_by_bats(unsigned long va); 5914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerrasextern unsigned long p_mapped_by_bats(unsigned long pa); 6014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerrasvoid setbat(int index, unsigned long virt, unsigned long phys, 6114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras unsigned int size, int flags); 6214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 6314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#else /* !HAVE_BATS */ 6414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#define v_mapped_by_bats(x) (0UL) 6514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#define p_mapped_by_bats(x) (0UL) 6614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#endif /* HAVE_BATS */ 6714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 6814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#ifdef HAVE_TLBCAM 6914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerrasextern unsigned int tlbcam_index; 7014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerrasextern unsigned long v_mapped_by_tlbcam(unsigned long va); 7114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerrasextern unsigned long p_mapped_by_tlbcam(unsigned long pa); 7214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#else /* !HAVE_TLBCAM */ 7314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#define v_mapped_by_tlbcam(x) (0UL) 7414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#define p_mapped_by_tlbcam(x) (0UL) 7514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#endif /* HAVE_TLBCAM */ 7614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 7714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#ifdef CONFIG_PTE_64BIT 7814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras/* 44x uses an 8kB pgdir because it has 8-byte Linux PTEs. */ 7914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#define PGDIR_ORDER 1 8014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#else 8114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#define PGDIR_ORDER 0 8214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#endif 8314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 8414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerraspgd_t *pgd_alloc(struct mm_struct *mm) 8514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras{ 8614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras pgd_t *ret; 8714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 8814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras ret = (pgd_t *)__get_free_pages(GFP_KERNEL|__GFP_ZERO, PGDIR_ORDER); 8914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras return ret; 9014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras} 9114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 9214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerrasvoid pgd_free(pgd_t *pgd) 9314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras{ 9414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras free_pages((unsigned long)pgd, PGDIR_ORDER); 9514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras} 9614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 9714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerraspte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address) 9814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras{ 9914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras pte_t *pte; 10014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras extern int mem_init_done; 10114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras extern void *early_get_page(void); 10214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 10314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras if (mem_init_done) { 10414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO); 10514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras } else { 10614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras pte = (pte_t *)early_get_page(); 10714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras if (pte) 10814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras clear_page(pte); 10914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras } 11014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras return pte; 11114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras} 11214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 11314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerrasstruct page *pte_alloc_one(struct mm_struct *mm, unsigned long address) 11414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras{ 11514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras struct page *ptepage; 11614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 11714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#ifdef CONFIG_HIGHPTE 1183ee1fcac33eae824422b9b98d972a85e79672426Paul Mackerras gfp_t flags = GFP_KERNEL | __GFP_HIGHMEM | __GFP_REPEAT; 11914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#else 1203ee1fcac33eae824422b9b98d972a85e79672426Paul Mackerras gfp_t flags = GFP_KERNEL | __GFP_REPEAT; 12114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#endif 12214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 12314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras ptepage = alloc_pages(flags, 0); 12414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras if (ptepage) 12514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras clear_highpage(ptepage); 12614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras return ptepage; 12714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras} 12814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 12914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerrasvoid pte_free_kernel(pte_t *pte) 13014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras{ 13114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#ifdef CONFIG_SMP 13214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras hash_page_sync(); 13314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#endif 13414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras free_page((unsigned long)pte); 13514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras} 13614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 13714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerrasvoid pte_free(struct page *ptepage) 13814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras{ 13914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#ifdef CONFIG_SMP 14014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras hash_page_sync(); 14114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#endif 14214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras __free_page(ptepage); 14314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras} 14414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 14514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#ifndef CONFIG_PHYS_64BIT 14614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerrasvoid __iomem * 14714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerrasioremap(phys_addr_t addr, unsigned long size) 14814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras{ 14914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras return __ioremap(addr, size, _PAGE_NO_CACHE); 15014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras} 15114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#else /* CONFIG_PHYS_64BIT */ 15214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerrasvoid __iomem * 15314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerrasioremap64(unsigned long long addr, unsigned long size) 15414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras{ 15514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras return __ioremap(addr, size, _PAGE_NO_CACHE); 15614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras} 157920573bd03bf690135967b5022362d34ede589c3Olaf HeringEXPORT_SYMBOL(ioremap64); 15814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 15914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerrasvoid __iomem * 16014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerrasioremap(phys_addr_t addr, unsigned long size) 16114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras{ 16214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras phys_addr_t addr64 = fixup_bigphys_addr(addr, size); 16314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 16414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras return ioremap64(addr64, size); 16514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras} 16614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#endif /* CONFIG_PHYS_64BIT */ 167920573bd03bf690135967b5022362d34ede589c3Olaf HeringEXPORT_SYMBOL(ioremap); 16814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 16914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerrasvoid __iomem * 17014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras__ioremap(phys_addr_t addr, unsigned long size, unsigned long flags) 17114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras{ 17214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras unsigned long v, i; 17314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras phys_addr_t p; 17414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras int err; 17514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 17614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras /* 17714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * Choose an address to map it to. 17814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * Once the vmalloc system is running, we use it. 17914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * Before then, we use space going down from ioremap_base 18014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * (ioremap_bot records where we're up to). 18114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras */ 18214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras p = addr & PAGE_MASK; 18314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras size = PAGE_ALIGN(addr + size) - p; 18414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 18514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras /* 18614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * If the address lies within the first 16 MB, assume it's in ISA 18714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * memory space 18814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras */ 18914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras if (p < 16*1024*1024) 19014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras p += _ISA_MEM_BASE; 19114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 19214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras /* 19314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * Don't allow anybody to remap normal RAM that we're using. 19414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * mem_init() sets high_memory so only do the check after that. 19514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras */ 1967c8c6b9776fb41134d87ef50706a777a45d61cd4Paul Mackerras if (mem_init_done && (p < virt_to_phys(high_memory))) { 19714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras printk("__ioremap(): phys addr "PHYS_FMT" is RAM lr %p\n", p, 19814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras __builtin_return_address(0)); 19914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras return NULL; 20014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras } 20114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 20214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras if (size == 0) 20314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras return NULL; 20414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 20514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras /* 20614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * Is it already mapped? Perhaps overlapped by a previous 20714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * BAT mapping. If the whole area is mapped then we're done, 20814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * otherwise remap it since we want to keep the virt addrs for 20914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * each request contiguous. 21014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * 21114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * We make the assumption here that if the bottom and top 21214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * of the range we want are mapped then it's mapped to the 21314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * same virt address (and this is contiguous). 21414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * -- Cort 21514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras */ 21614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras if ((v = p_mapped_by_bats(p)) /*&& p_mapped_by_bats(p+size-1)*/ ) 21714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras goto out; 21814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 21914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras if ((v = p_mapped_by_tlbcam(p))) 22014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras goto out; 22114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 22214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras if (mem_init_done) { 22314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras struct vm_struct *area; 22414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras area = get_vm_area(size, VM_IOREMAP); 22514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras if (area == 0) 22614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras return NULL; 22714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras v = (unsigned long) area->addr; 22814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras } else { 22914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras v = (ioremap_bot -= size); 23014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras } 23114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 23214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras if ((flags & _PAGE_PRESENT) == 0) 23314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras flags |= _PAGE_KERNEL; 23414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras if (flags & _PAGE_NO_CACHE) 23514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras flags |= _PAGE_GUARDED; 23614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 23714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras /* 23814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * Should check if it is a candidate for a BAT mapping 23914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras */ 24014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 24114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras err = 0; 24214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras for (i = 0; i < size && err == 0; i += PAGE_SIZE) 24314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras err = map_page(v+i, p+i, flags); 24414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras if (err) { 24514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras if (mem_init_done) 24614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras vunmap((void *)v); 24714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras return NULL; 24814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras } 24914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 25014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerrasout: 25114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras return (void __iomem *) (v + ((unsigned long)addr & ~PAGE_MASK)); 25214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras} 253920573bd03bf690135967b5022362d34ede589c3Olaf HeringEXPORT_SYMBOL(__ioremap); 25414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 25514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerrasvoid iounmap(volatile void __iomem *addr) 25614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras{ 25714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras /* 25814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * If mapped by BATs then there is nothing to do. 25914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * Calling vfree() generates a benign warning. 26014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras */ 26114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras if (v_mapped_by_bats((unsigned long)addr)) return; 26214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 26314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras if (addr > high_memory && (unsigned long) addr < ioremap_bot) 26414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras vunmap((void *) (PAGE_MASK & (unsigned long)addr)); 26514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras} 266920573bd03bf690135967b5022362d34ede589c3Olaf HeringEXPORT_SYMBOL(iounmap); 26714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 26814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerrasvoid __iomem *ioport_map(unsigned long port, unsigned int len) 26914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras{ 27014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras return (void __iomem *) (port + _IO_BASE); 27114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras} 27214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 27314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerrasvoid ioport_unmap(void __iomem *addr) 27414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras{ 27514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras /* Nothing to do */ 27614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras} 27714cf11af6cf608eb8c23e989ddb17a715ddce109Paul MackerrasEXPORT_SYMBOL(ioport_map); 27814cf11af6cf608eb8c23e989ddb17a715ddce109Paul MackerrasEXPORT_SYMBOL(ioport_unmap); 27914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 28014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerrasint 28114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerrasmap_page(unsigned long va, phys_addr_t pa, int flags) 28214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras{ 28314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras pmd_t *pd; 28414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras pte_t *pg; 28514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras int err = -ENOMEM; 28614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 28714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras /* Use upper 10 bits of VA to index the first level map */ 28814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras pd = pmd_offset(pgd_offset_k(va), va); 28914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras /* Use middle 10 bits of VA to index the second-level map */ 290e2f2e58e7968f8446b1078a20a18bf8ea12b4fbcPaul Mackerras pg = pte_alloc_kernel(pd, va); 29114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras if (pg != 0) { 29214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras err = 0; 29314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras set_pte_at(&init_mm, va, pg, pfn_pte(pa >> PAGE_SHIFT, __pgprot(flags))); 29414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras if (mem_init_done) 29514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras flush_HPTE(0, va, pmd_val(*pd)); 29614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras } 29714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras return err; 29814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras} 29914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 30014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras/* 30114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * Map in all of physical memory starting at KERNELBASE. 30214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras */ 30314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerrasvoid __init mapin_ram(void) 30414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras{ 30514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras unsigned long v, p, s, f; 30614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 30714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras s = mmu_mapin_ram(); 30814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras v = KERNELBASE + s; 30914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras p = PPC_MEMSTART + s; 31014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras for (; s < total_lowmem; s += PAGE_SIZE) { 31114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras if ((char *) v >= _stext && (char *) v < etext) 31214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras f = _PAGE_RAM_TEXT; 31314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras else 31414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras f = _PAGE_RAM; 31514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras map_page(v, p, f); 31614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras v += PAGE_SIZE; 31714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras p += PAGE_SIZE; 31814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras } 31914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras} 32014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 32114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras/* is x a power of 2? */ 32214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#define is_power_of_2(x) ((x) != 0 && (((x) & ((x) - 1)) == 0)) 32314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 32414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras/* is x a power of 4? */ 32514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#define is_power_of_4(x) ((x) != 0 && (((x) & (x-1)) == 0) && (ffs(x) & 1)) 32614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 32714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras/* 32814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * Set up a mapping for a block of I/O. 32914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * virt, phys, size must all be page-aligned. 33014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * This should only be called before ioremap is called. 33114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras */ 33214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerrasvoid __init io_block_mapping(unsigned long virt, phys_addr_t phys, 33314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras unsigned int size, int flags) 33414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras{ 33514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras int i; 33614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 33714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras if (virt > KERNELBASE && virt < ioremap_bot) 33814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras ioremap_bot = ioremap_base = virt; 33914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 34014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#ifdef HAVE_BATS 34114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras /* 34214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * Use a BAT for this if possible... 34314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras */ 34414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras if (io_bat_index < 2 && is_power_of_2(size) 34514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras && (virt & (size - 1)) == 0 && (phys & (size - 1)) == 0) { 34614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras setbat(io_bat_index, virt, phys, size, flags); 34714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras ++io_bat_index; 34814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras return; 34914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras } 35014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#endif /* HAVE_BATS */ 35114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 35214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#ifdef HAVE_TLBCAM 35314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras /* 35414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * Use a CAM for this if possible... 35514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras */ 35614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras if (tlbcam_index < num_tlbcam_entries && is_power_of_4(size) 35714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras && (virt & (size - 1)) == 0 && (phys & (size - 1)) == 0) { 35814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras settlbcam(tlbcam_index, virt, phys, size, flags, 0); 35914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras ++tlbcam_index; 36014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras return; 36114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras } 36214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#endif /* HAVE_TLBCAM */ 36314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 36414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras /* No BATs available, put it in the page tables. */ 36514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras for (i = 0; i < size; i += PAGE_SIZE) 36614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras map_page(virt + i, phys + i, flags); 36714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras} 36814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 36914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras/* Scan the real Linux page tables and return a PTE pointer for 37014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * a virtual address in a context. 37114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * Returns true (1) if PTE was found, zero otherwise. The pointer to 37214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * the PTE pointer is unmodified if PTE is not found. 37314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras */ 37414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerrasint 37514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerrasget_pteptr(struct mm_struct *mm, unsigned long addr, pte_t **ptep) 37614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras{ 37714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras pgd_t *pgd; 37814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras pmd_t *pmd; 37914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras pte_t *pte; 38014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras int retval = 0; 38114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 38214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras pgd = pgd_offset(mm, addr & PAGE_MASK); 38314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras if (pgd) { 38414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras pmd = pmd_offset(pgd, addr & PAGE_MASK); 38514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras if (pmd_present(*pmd)) { 38614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras pte = pte_offset_map(pmd, addr & PAGE_MASK); 38714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras if (pte) { 38814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras retval = 1; 38914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras *ptep = pte; 39014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras /* XXX caller needs to do pte_unmap, yuck */ 39114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras } 39214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras } 39314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras } 39414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras return(retval); 39514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras} 39614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 39714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras/* Find physical address for this virtual address. Normally used by 39814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * I/O functions, but anyone can call it. 39914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras */ 40014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerrasunsigned long iopa(unsigned long addr) 40114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras{ 40214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras unsigned long pa; 40314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 40414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras /* I don't know why this won't work on PMacs or CHRP. It 40514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * appears there is some bug, or there is some implicit 40614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * mapping done not properly represented by BATs or in page 40714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * tables.......I am actively working on resolving this, but 40814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * can't hold up other stuff. -- Dan 40914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras */ 41014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras pte_t *pte; 41114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras struct mm_struct *mm; 41214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 41314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras /* Check the BATs */ 41414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras pa = v_mapped_by_bats(addr); 41514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras if (pa) 41614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras return pa; 41714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 41814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras /* Allow mapping of user addresses (within the thread) 41914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * for DMA if necessary. 42014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras */ 42114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras if (addr < TASK_SIZE) 42214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras mm = current->mm; 42314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras else 42414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras mm = &init_mm; 42514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 42614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras pa = 0; 42714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras if (get_pteptr(mm, addr, &pte)) { 42814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras pa = (pte_val(*pte) & PAGE_MASK) | (addr & ~PAGE_MASK); 42914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras pte_unmap(pte); 43014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras } 43114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 43214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras return(pa); 43314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras} 43414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 43514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras/* This is will find the virtual address for a physical one.... 43614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * Swiped from APUS, could be dangerous :-). 43714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * This is only a placeholder until I really find a way to make this 43814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * work. -- Dan 43914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras */ 44014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerrasunsigned long 44114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerrasmm_ptov (unsigned long paddr) 44214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras{ 44314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras unsigned long ret; 44414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#if 0 44514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras if (paddr < 16*1024*1024) 44614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras ret = ZTWO_VADDR(paddr); 44714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras else { 44814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras int i; 44914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 45014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras for (i = 0; i < kmap_chunk_count;){ 45114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras unsigned long phys = kmap_chunks[i++]; 45214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras unsigned long size = kmap_chunks[i++]; 45314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras unsigned long virt = kmap_chunks[i++]; 45414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras if (paddr >= phys 45514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras && paddr < (phys + size)){ 45614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras ret = virt + paddr - phys; 45714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras goto exit; 45814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras } 45914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras } 46014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 46114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras ret = (unsigned long) __va(paddr); 46214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras } 46314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerrasexit: 46414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#ifdef DEBUGPV 46514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras printk ("PTOV(%lx)=%lx\n", paddr, ret); 46614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#endif 46714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#else 46814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras ret = (unsigned long)paddr + KERNELBASE; 46914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#endif 47014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras return ret; 47114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras} 47214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 473