1/* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file "COPYING" in the main directory of this archive 4 * for more details. 5 * 6 * Copyright (C) 1994 - 1999, 2000, 03 Ralf Baechle 7 * Copyright (C) 1999, 2000 Silicon Graphics, Inc. 8 */ 9#ifndef _ASM_PAGE_H 10#define _ASM_PAGE_H 11 12 13#ifdef __KERNEL__ 14 15#include <spaces.h> 16 17/* 18 * PAGE_SHIFT determines the page size 19 */ 20#ifdef CONFIG_PAGE_SIZE_4KB 21#define PAGE_SHIFT 12 22#endif 23#ifdef CONFIG_PAGE_SIZE_8KB 24#define PAGE_SHIFT 13 25#endif 26#ifdef CONFIG_PAGE_SIZE_16KB 27#define PAGE_SHIFT 14 28#endif 29#ifdef CONFIG_PAGE_SIZE_64KB 30#define PAGE_SHIFT 16 31#endif 32#define PAGE_SIZE (1UL << PAGE_SHIFT) 33#define PAGE_MASK (~((1 << PAGE_SHIFT) - 1)) 34 35#ifndef __ASSEMBLY__ 36 37/* 38 * This gives the physical RAM offset. 39 */ 40#ifndef PHYS_OFFSET 41#define PHYS_OFFSET 0UL 42#endif 43 44/* 45 * It's normally defined only for FLATMEM config but it's 46 * used in our early mem init code for all memory models. 47 * So always define it. 48 */ 49#define ARCH_PFN_OFFSET PFN_UP(PHYS_OFFSET) 50 51#include <linux/pfn.h> 52#include <asm/io.h> 53 54extern void clear_page(void * page); 55extern void copy_page(void * to, void * from); 56 57extern unsigned long shm_align_mask; 58 59static inline unsigned long pages_do_alias(unsigned long addr1, 60 unsigned long addr2) 61{ 62 return (addr1 ^ addr2) & shm_align_mask; 63} 64 65struct page; 66 67static inline void clear_user_page(void *addr, unsigned long vaddr, 68 struct page *page) 69{ 70 extern void (*flush_data_cache_page)(unsigned long addr); 71 72 clear_page(addr); 73 if (pages_do_alias((unsigned long) addr, vaddr & PAGE_MASK)) 74 flush_data_cache_page((unsigned long)addr); 75} 76 77extern void copy_user_page(void *vto, void *vfrom, unsigned long vaddr, 78 struct page *to); 79struct vm_area_struct; 80extern void copy_user_highpage(struct page *to, struct page *from, 81 unsigned long vaddr, struct vm_area_struct *vma); 82 83#define __HAVE_ARCH_COPY_USER_HIGHPAGE 84 85/* 86 * These are used to make use of C type-checking.. 87 */ 88#ifdef CONFIG_64BIT_PHYS_ADDR 89 #ifdef CONFIG_CPU_MIPS32 90 typedef struct { unsigned long pte_low, pte_high; } pte_t; 91 #define pte_val(x) ((x).pte_low | ((unsigned long long)(x).pte_high << 32)) 92 #define __pte(x) ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; }) 93 #else 94 typedef struct { unsigned long long pte; } pte_t; 95 #define pte_val(x) ((x).pte) 96 #define __pte(x) ((pte_t) { (x) } ) 97 #endif 98#else 99typedef struct { unsigned long pte; } pte_t; 100#define pte_val(x) ((x).pte) 101#define __pte(x) ((pte_t) { (x) } ) 102#endif 103 104/* 105 * For 3-level pagetables we defines these ourselves, for 2-level the 106 * definitions are supplied by <asm-generic/pgtable-nopmd.h>. 107 */ 108#ifdef CONFIG_64BIT 109 110typedef struct { unsigned long pmd; } pmd_t; 111#define pmd_val(x) ((x).pmd) 112#define __pmd(x) ((pmd_t) { (x) } ) 113 114#endif 115 116/* 117 * Right now we don't support 4-level pagetables, so all pud-related 118 * definitions come from <asm-generic/pgtable-nopud.h>. 119 */ 120 121/* 122 * Finall the top of the hierarchy, the pgd 123 */ 124typedef struct { unsigned long pgd; } pgd_t; 125#define pgd_val(x) ((x).pgd) 126#define __pgd(x) ((pgd_t) { (x) } ) 127 128/* 129 * Manipulate page protection bits 130 */ 131typedef struct { unsigned long pgprot; } pgprot_t; 132#define pgprot_val(x) ((x).pgprot) 133#define __pgprot(x) ((pgprot_t) { (x) } ) 134 135/* 136 * On R4000-style MMUs where a TLB entry is mapping a adjacent even / odd 137 * pair of pages we only have a single global bit per pair of pages. When 138 * writing to the TLB make sure we always have the bit set for both pages 139 * or none. This macro is used to access the `buddy' of the pte we're just 140 * working on. 141 */ 142#define ptep_buddy(x) ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t))) 143 144#endif /* !__ASSEMBLY__ */ 145 146/* to align the pointer to the (next) page boundary */ 147#define PAGE_ALIGN(addr) (((addr) + PAGE_SIZE - 1) & PAGE_MASK) 148 149/* 150 * __pa()/__va() should be used only during mem init. 151 */ 152#if defined(CONFIG_64BIT) && !defined(CONFIG_BUILD_ELF64) 153#define __pa_page_offset(x) ((unsigned long)(x) < CKSEG0 ? PAGE_OFFSET : CKSEG0) 154#else 155#define __pa_page_offset(x) PAGE_OFFSET 156#endif 157#define __pa(x) ((unsigned long)(x) - __pa_page_offset(x) + PHYS_OFFSET) 158#define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET)) 159#define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x),0)) 160 161#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) 162 163#ifdef CONFIG_FLATMEM 164 165#define pfn_valid(pfn) ((pfn) >= ARCH_PFN_OFFSET && (pfn) < max_mapnr) 166 167#elif defined(CONFIG_SPARSEMEM) 168 169/* pfn_valid is defined in linux/mmzone.h */ 170 171#elif defined(CONFIG_NEED_MULTIPLE_NODES) 172 173#define pfn_valid(pfn) \ 174({ \ 175 unsigned long __pfn = (pfn); \ 176 int __n = pfn_to_nid(__pfn); \ 177 ((__n >= 0) ? (__pfn < NODE_DATA(__n)->node_start_pfn + \ 178 NODE_DATA(__n)->node_spanned_pages) \ 179 : 0); \ 180}) 181 182#endif 183 184#define virt_to_page(kaddr) pfn_to_page(PFN_DOWN(virt_to_phys(kaddr))) 185#define virt_addr_valid(kaddr) pfn_valid(PFN_DOWN(virt_to_phys(kaddr))) 186 187#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \ 188 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) 189 190#define UNCAC_ADDR(addr) ((addr) - PAGE_OFFSET + UNCAC_BASE) 191#define CAC_ADDR(addr) ((addr) - UNCAC_BASE + PAGE_OFFSET) 192 193#include <asm-generic/memory_model.h> 194#include <asm-generic/page.h> 195 196#endif /* defined (__KERNEL__) */ 197 198#endif /* _ASM_PAGE_H */ 199