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; 58extern unsigned char shm_align_shift; 59 60#define VALIAS_PAGE_OFFSET_MASK (shm_align_mask) 61#define VALIAS_PAGE_MASK (~VALIAS_PAGE_OFFSET_MASK) 62#define VALIAS_PAGE_SHIFT (shm_align_shift) 63#define VALIAS_SHIFT (VALIAS_PAGE_SHIFT - PAGE_SHIFT) 64#define VALIAS_PAGE_SIZE (1UL << VALIAS_PAGE_SHIFT) 65#define VALIAS_IDX(x) ((x) << VALIAS_SHIFT) 66 67static inline unsigned long pages_do_alias(unsigned long addr1, 68 unsigned long addr2) 69{ 70 return (addr1 ^ addr2) & shm_align_mask; 71} 72 73struct page; 74 75static inline void clear_user_page(void *addr, unsigned long vaddr, 76 struct page *page) 77{ 78 extern void (*flush_data_cache_page)(unsigned long addr); 79 80 clear_page(addr); 81 if (pages_do_alias((unsigned long) addr, vaddr & PAGE_MASK)) 82 flush_data_cache_page((unsigned long)addr); 83} 84 85extern void copy_user_page(void *vto, void *vfrom, unsigned long vaddr, 86 struct page *to); 87struct vm_area_struct; 88extern void copy_user_highpage(struct page *to, struct page *from, 89 unsigned long vaddr, struct vm_area_struct *vma); 90 91#define __HAVE_ARCH_COPY_USER_HIGHPAGE 92 93/* 94 * These are used to make use of C type-checking.. 95 */ 96#ifdef CONFIG_64BIT_PHYS_ADDR 97 #ifdef CONFIG_CPU_MIPS32 98 typedef struct { unsigned long pte_low, pte_high; } pte_t; 99 #define pte_val(x) ((x).pte_low | ((unsigned long long)(x).pte_high << 32)) 100 #define __pte(x) ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; }) 101 #else 102 typedef struct { unsigned long long pte; } pte_t; 103 #define pte_val(x) ((x).pte) 104 #define __pte(x) ((pte_t) { (x) } ) 105 #endif 106#else 107typedef struct { unsigned long pte; } pte_t; 108#define pte_val(x) ((x).pte) 109#define __pte(x) ((pte_t) { (x) } ) 110#endif 111 112/* 113 * For 3-level pagetables we defines these ourselves, for 2-level the 114 * definitions are supplied by <asm-generic/pgtable-nopmd.h>. 115 */ 116#ifdef CONFIG_64BIT 117 118typedef struct { unsigned long pmd; } pmd_t; 119#define pmd_val(x) ((x).pmd) 120#define __pmd(x) ((pmd_t) { (x) } ) 121 122#endif 123 124/* 125 * Right now we don't support 4-level pagetables, so all pud-related 126 * definitions come from <asm-generic/pgtable-nopud.h>. 127 */ 128 129/* 130 * Finall the top of the hierarchy, the pgd 131 */ 132typedef struct { unsigned long pgd; } pgd_t; 133#define pgd_val(x) ((x).pgd) 134#define __pgd(x) ((pgd_t) { (x) } ) 135 136/* 137 * Manipulate page protection bits 138 */ 139typedef struct { unsigned long pgprot; } pgprot_t; 140#define pgprot_val(x) ((x).pgprot) 141#define __pgprot(x) ((pgprot_t) { (x) } ) 142 143/* 144 * On R4000-style MMUs where a TLB entry is mapping a adjacent even / odd 145 * pair of pages we only have a single global bit per pair of pages. When 146 * writing to the TLB make sure we always have the bit set for both pages 147 * or none. This macro is used to access the `buddy' of the pte we're just 148 * working on. 149 */ 150#define ptep_buddy(x) ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t))) 151 152#endif /* !__ASSEMBLY__ */ 153 154/* to align the pointer to the (next) page boundary */ 155#define PAGE_ALIGN(addr) (((addr) + PAGE_SIZE - 1) & PAGE_MASK) 156 157/* 158 * __pa()/__va() should be used only during mem init. 159 */ 160#if defined(CONFIG_64BIT) && !defined(CONFIG_BUILD_ELF64) 161#define __pa_page_offset(x) ((unsigned long)(x) < CKSEG0 ? PAGE_OFFSET : CKSEG0) 162#else 163#define __pa_page_offset(x) PAGE_OFFSET 164#endif 165#define __pa(x) ((unsigned long)(x) - __pa_page_offset(x) + PHYS_OFFSET) 166#define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET)) 167#define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x),0)) 168 169#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) 170 171#ifdef CONFIG_FLATMEM 172 173#define pfn_valid(pfn) ((pfn) >= ARCH_PFN_OFFSET && (pfn) < max_mapnr) 174 175#elif defined(CONFIG_SPARSEMEM) 176 177/* pfn_valid is defined in linux/mmzone.h */ 178 179#elif defined(CONFIG_NEED_MULTIPLE_NODES) 180 181#define pfn_valid(pfn) \ 182({ \ 183 unsigned long __pfn = (pfn); \ 184 int __n = pfn_to_nid(__pfn); \ 185 ((__n >= 0) ? (__pfn < NODE_DATA(__n)->node_start_pfn + \ 186 NODE_DATA(__n)->node_spanned_pages) \ 187 : 0); \ 188}) 189 190#endif 191 192#define virt_to_page(kaddr) pfn_to_page(PFN_DOWN(virt_to_phys(kaddr))) 193#define virt_addr_valid(kaddr) pfn_valid(PFN_DOWN(virt_to_phys(kaddr))) 194 195#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \ 196 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) 197 198#define UNCAC_ADDR(addr) ((addr) - PAGE_OFFSET + UNCAC_BASE) 199#define CAC_ADDR(addr) ((addr) - UNCAC_BASE + PAGE_OFFSET) 200 201#include <asm-generic/memory_model.h> 202#include <asm-generic/page.h> 203 204#endif /* defined (__KERNEL__) */ 205 206#endif /* _ASM_PAGE_H */ 207