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 #include <spaces.h> 13 14 /* 15 * PAGE_SHIFT determines the page size 16 */ 17 #ifdef CONFIG_PAGE_SIZE_4KB 18 #define PAGE_SHIFT 12 19 #endif 20 #ifdef CONFIG_PAGE_SIZE_8KB 21 #define PAGE_SHIFT 13 22 #endif 23 #ifdef CONFIG_PAGE_SIZE_16KB 24 #define PAGE_SHIFT 14 25 #endif 26 #ifdef CONFIG_PAGE_SIZE_32KB 27 #define PAGE_SHIFT 15 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 #include <linux/pfn.h> 38 #include <asm/io.h> 39 40 extern void build_clear_page(void); 41 extern void build_copy_page(void); 42 43 /* 44 * It's normally defined only for FLATMEM config but it's 45 * used in our early mem init code for all memory models. 46 * So always define it. 47 */ 48 #define ARCH_PFN_OFFSET PFN_UP(PHYS_OFFSET) 49 50 extern void clear_page(void * page); 51 extern void copy_page(void * to, void * from); 52 53 extern unsigned long shm_align_mask; 54 55 static inline unsigned long pages_do_alias(unsigned long addr1, 56 unsigned long addr2) 57 { 58 return (addr1 ^ addr2) & shm_align_mask; 59 } 60 61 struct page; 62 63 static inline void clear_user_page(void *addr, unsigned long vaddr, 64 struct page *page) 65 { 66 extern void (*flush_data_cache_page)(unsigned long addr); 67 68 clear_page(addr); 69 if (pages_do_alias((unsigned long) addr, vaddr & PAGE_MASK)) 70 flush_data_cache_page((unsigned long)addr); 71 } 72 73 extern void copy_user_page(void *vto, void *vfrom, unsigned long vaddr, 74 struct page *to); 75 struct vm_area_struct; 76 extern void copy_user_highpage(struct page *to, struct page *from, 77 unsigned long vaddr, struct vm_area_struct *vma); 78 79 #define __HAVE_ARCH_COPY_USER_HIGHPAGE 80 81 /* 82 * These are used to make use of C type-checking.. 83 */ 84 #ifdef CONFIG_64BIT_PHYS_ADDR 85 #ifdef CONFIG_CPU_MIPS32 86 typedef struct { unsigned long pte_low, pte_high; } pte_t; 87 #define pte_val(x) ((x).pte_low | ((unsigned long long)(x).pte_high << 32)) 88 #define __pte(x) ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; }) 89 #else 90 typedef struct { unsigned long long pte; } pte_t; 91 #define pte_val(x) ((x).pte) 92 #define __pte(x) ((pte_t) { (x) } ) 93 #endif 94 #else 95 typedef struct { unsigned long pte; } pte_t; 96 #define pte_val(x) ((x).pte) 97 #define __pte(x) ((pte_t) { (x) } ) 98 #endif 99 typedef struct page *pgtable_t; 100 101 /* 102 * For 3-level pagetables we defines these ourselves, for 2-level the 103 * definitions are supplied by <asm-generic/pgtable-nopmd.h>. 104 */ 105 #ifdef CONFIG_64BIT 106 107 typedef struct { unsigned long pmd; } pmd_t; 108 #define pmd_val(x) ((x).pmd) 109 #define __pmd(x) ((pmd_t) { (x) } ) 110 111 #endif 112 113 /* 114 * Right now we don't support 4-level pagetables, so all pud-related 115 * definitions come from <asm-generic/pgtable-nopud.h>. 116 */ 117 118 /* 119 * Finall the top of the hierarchy, the pgd 120 */ 121 typedef struct { unsigned long pgd; } pgd_t; 122 #define pgd_val(x) ((x).pgd) 123 #define __pgd(x) ((pgd_t) { (x) } ) 124 125 /* 126 * Manipulate page protection bits 127 */ 128 typedef struct { unsigned long pgprot; } pgprot_t; 129 #define pgprot_val(x) ((x).pgprot) 130 #define __pgprot(x) ((pgprot_t) { (x) } ) 131 132 /* 133 * On R4000-style MMUs where a TLB entry is mapping a adjacent even / odd 134 * pair of pages we only have a single global bit per pair of pages. When 135 * writing to the TLB make sure we always have the bit set for both pages 136 * or none. This macro is used to access the `buddy' of the pte we're just 137 * working on. 138 */ 139 #define ptep_buddy(x) ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t))) 140 141 #endif /* !__ASSEMBLY__ */ 142 143 /* 144 * __pa()/__va() should be used only during mem init. 145 */ 146 #ifdef CONFIG_64BIT 147 #define __pa(x) \ 148 ({ \ 149 unsigned long __x = (unsigned long)(x); \ 150 __x < CKSEG0 ? XPHYSADDR(__x) : CPHYSADDR(__x); \ 151 }) 152 #else 153 #define __pa(x) \ 154 ((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET) 155 #endif 156 #define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET)) 157 #define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0)) 158 159 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) 160 161 #ifdef CONFIG_FLATMEM 162 163 #define pfn_valid(pfn) ((pfn) >= ARCH_PFN_OFFSET && (pfn) < max_mapnr) 164 165 #elif defined(CONFIG_SPARSEMEM) 166 167 /* pfn_valid is defined in linux/mmzone.h */ 168 169 #elif defined(CONFIG_NEED_MULTIPLE_NODES) 170 171 #define pfn_valid(pfn) \ 172 ({ \ 173 unsigned long __pfn = (pfn); \ 174 int __n = pfn_to_nid(__pfn); \ 175 ((__n >= 0) ? (__pfn < NODE_DATA(__n)->node_start_pfn + \ 176 NODE_DATA(__n)->node_spanned_pages) \ 177 : 0); \ 178 }) 179 180 #endif 181 182 #define virt_to_page(kaddr) pfn_to_page(PFN_DOWN(virt_to_phys(kaddr))) 183 #define virt_addr_valid(kaddr) pfn_valid(PFN_DOWN(virt_to_phys(kaddr))) 184 185 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \ 186 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) 187 188 #define UNCAC_ADDR(addr) ((addr) - PAGE_OFFSET + UNCAC_BASE) 189 #define CAC_ADDR(addr) ((addr) - UNCAC_BASE + PAGE_OFFSET) 190 191 #include <asm-generic/memory_model.h> 192 #include <asm-generic/page.h> 193 194 #endif /* _ASM_PAGE_H */ 195