1 #ifndef _I386_PAGE_H 2 #define _I386_PAGE_H 3 4 /* PAGE_SHIFT determines the page size */ 5 #define PAGE_SHIFT 12 6 #define PAGE_SIZE (1UL << PAGE_SHIFT) 7 #define PAGE_MASK (~(PAGE_SIZE-1)) 8 9 #define LARGE_PAGE_MASK (~(LARGE_PAGE_SIZE-1)) 10 #define LARGE_PAGE_SIZE (1UL << PMD_SHIFT) 11 12 #ifdef __KERNEL__ 13 #ifndef __ASSEMBLY__ 14 15 #ifdef CONFIG_X86_USE_3DNOW 16 17 #include <asm/mmx.h> 18 19 #define clear_page(page) mmx_clear_page((void *)(page)) 20 #define copy_page(to,from) mmx_copy_page(to,from) 21 22 #else 23 24 /* 25 * On older X86 processors it's not a win to use MMX here it seems. 26 * Maybe the K6-III ? 27 */ 28 29 #define clear_page(page) memset((void *)(page), 0, PAGE_SIZE) 30 #define copy_page(to,from) memcpy((void *)(to), (void *)(from), PAGE_SIZE) 31 32 #endif 33 34 #define clear_user_page(page, vaddr, pg) clear_page(page) 35 #define copy_user_page(to, from, vaddr, pg) copy_page(to, from) 36 37 #define __alloc_zeroed_user_highpage(movableflags, vma, vaddr) \ 38 alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr) 39 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE 40 41 /* 42 * These are used to make use of C type-checking.. 43 */ 44 extern int nx_enabled; 45 46 #ifdef CONFIG_X86_PAE 47 typedef struct { unsigned long pte_low, pte_high; } pte_t; 48 typedef struct { unsigned long long pmd; } pmd_t; 49 typedef struct { unsigned long long pgd; } pgd_t; 50 typedef struct { unsigned long long pgprot; } pgprot_t; 51 52 static inline unsigned long long native_pgd_val(pgd_t pgd) 53 { 54 return pgd.pgd; 55 } 56 57 static inline unsigned long long native_pmd_val(pmd_t pmd) 58 { 59 return pmd.pmd; 60 } 61 62 static inline unsigned long long native_pte_val(pte_t pte) 63 { 64 return pte.pte_low | ((unsigned long long)pte.pte_high << 32); 65 } 66 67 static inline pgd_t native_make_pgd(unsigned long long val) 68 { 69 return (pgd_t) { val }; 70 } 71 72 static inline pmd_t native_make_pmd(unsigned long long val) 73 { 74 return (pmd_t) { val }; 75 } 76 77 static inline pte_t native_make_pte(unsigned long long val) 78 { 79 return (pte_t) { .pte_low = val, .pte_high = (val >> 32) } ; 80 } 81 82 #ifndef CONFIG_PARAVIRT 83 #define pmd_val(x) native_pmd_val(x) 84 #define __pmd(x) native_make_pmd(x) 85 #endif 86 87 #define HPAGE_SHIFT 21 88 #include <asm-generic/pgtable-nopud.h> 89 #else /* !CONFIG_X86_PAE */ 90 typedef struct { unsigned long pte_low; } pte_t; 91 typedef struct { unsigned long pgd; } pgd_t; 92 typedef struct { unsigned long pgprot; } pgprot_t; 93 #define boot_pte_t pte_t /* or would you rather have a typedef */ 94 95 static inline unsigned long native_pgd_val(pgd_t pgd) 96 { 97 return pgd.pgd; 98 } 99 100 static inline unsigned long native_pte_val(pte_t pte) 101 { 102 return pte.pte_low; 103 } 104 105 static inline pgd_t native_make_pgd(unsigned long val) 106 { 107 return (pgd_t) { val }; 108 } 109 110 static inline pte_t native_make_pte(unsigned long val) 111 { 112 return (pte_t) { .pte_low = val }; 113 } 114 115 #define HPAGE_SHIFT 22 116 #include <asm-generic/pgtable-nopmd.h> 117 #endif /* CONFIG_X86_PAE */ 118 119 #define PTE_MASK PAGE_MASK 120 121 #ifdef CONFIG_HUGETLB_PAGE 122 #define HPAGE_SIZE ((1UL) << HPAGE_SHIFT) 123 #define HPAGE_MASK (~(HPAGE_SIZE - 1)) 124 #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT) 125 #define HAVE_ARCH_HUGETLB_UNMAPPED_AREA 126 #endif 127 128 #define pgprot_val(x) ((x).pgprot) 129 #define __pgprot(x) ((pgprot_t) { (x) } ) 130 131 #ifndef CONFIG_PARAVIRT 132 #define pgd_val(x) native_pgd_val(x) 133 #define __pgd(x) native_make_pgd(x) 134 #define pte_val(x) native_pte_val(x) 135 #define __pte(x) native_make_pte(x) 136 #endif 137 138 #endif /* !__ASSEMBLY__ */ 139 140 /* to align the pointer to the (next) page boundary */ 141 #define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK) 142 143 /* 144 * This handles the memory map.. We could make this a config 145 * option, but too many people screw it up, and too few need 146 * it. 147 * 148 * A __PAGE_OFFSET of 0xC0000000 means that the kernel has 149 * a virtual address space of one gigabyte, which limits the 150 * amount of physical memory you can use to about 950MB. 151 * 152 * If you want more physical memory than this then see the CONFIG_HIGHMEM4G 153 * and CONFIG_HIGHMEM64G options in the kernel configuration. 154 */ 155 156 #ifndef __ASSEMBLY__ 157 158 struct vm_area_struct; 159 160 /* 161 * This much address space is reserved for vmalloc() and iomap() 162 * as well as fixmap mappings. 163 */ 164 extern unsigned int __VMALLOC_RESERVE; 165 166 extern int sysctl_legacy_va_layout; 167 168 extern int page_is_ram(unsigned long pagenr); 169 170 #endif /* __ASSEMBLY__ */ 171 172 #ifdef __ASSEMBLY__ 173 #define __PAGE_OFFSET CONFIG_PAGE_OFFSET 174 #else 175 #define __PAGE_OFFSET ((unsigned long)CONFIG_PAGE_OFFSET) 176 #endif 177 178 179 #define PAGE_OFFSET ((unsigned long)__PAGE_OFFSET) 180 #define VMALLOC_RESERVE ((unsigned long)__VMALLOC_RESERVE) 181 #define MAXMEM (-__PAGE_OFFSET-__VMALLOC_RESERVE) 182 #define __pa(x) ((unsigned long)(x)-PAGE_OFFSET) 183 /* __pa_symbol should be used for C visible symbols. 184 This seems to be the official gcc blessed way to do such arithmetic. */ 185 #define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x),0)) 186 #define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET)) 187 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) 188 #ifdef CONFIG_FLATMEM 189 #define pfn_valid(pfn) ((pfn) < max_mapnr) 190 #endif /* CONFIG_FLATMEM */ 191 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) 192 193 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) 194 195 #define VM_DATA_DEFAULT_FLAGS \ 196 (VM_READ | VM_WRITE | \ 197 ((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0 ) | \ 198 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) 199 200 #include <asm-generic/memory_model.h> 201 #include <asm-generic/page.h> 202 203 #define __HAVE_ARCH_GATE_AREA 1 204 #endif /* __KERNEL__ */ 205 206 #endif /* _I386_PAGE_H */ 207
