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(vma, vaddr) alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO, vma, vaddr) 38#define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE 39 40/* 41 * These are used to make use of C type-checking.. 42 */ 43extern int nx_enabled; 44 45#ifdef CONFIG_X86_PAE 46extern unsigned long long __supported_pte_mask; 47typedef struct { unsigned long pte_low, pte_high; } pte_t; 48typedef struct { unsigned long long pmd; } pmd_t; 49typedef struct { unsigned long long pgd; } pgd_t; 50typedef struct { unsigned long long pgprot; } pgprot_t; 51 52static inline unsigned long long native_pgd_val(pgd_t pgd) 53{ 54 return pgd.pgd; 55} 56 57static inline unsigned long long native_pmd_val(pmd_t pmd) 58{ 59 return pmd.pmd; 60} 61 62static 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 67static inline pgd_t native_make_pgd(unsigned long long val) 68{ 69 return (pgd_t) { val }; 70} 71 72static inline pmd_t native_make_pmd(unsigned long long val) 73{ 74 return (pmd_t) { val }; 75} 76 77static 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 */ 90typedef struct { unsigned long pte_low; } pte_t; 91typedef struct { unsigned long pgd; } pgd_t; 92typedef struct { unsigned long pgprot; } pgprot_t; 93#define boot_pte_t pte_t /* or would you rather have a typedef */ 94 95static inline unsigned long native_pgd_val(pgd_t pgd) 96{ 97 return pgd.pgd; 98} 99 100static inline unsigned long native_pte_val(pte_t pte) 101{ 102 return pte.pte_low; 103} 104 105static inline pgd_t native_make_pgd(unsigned long val) 106{ 107 return (pgd_t) { val }; 108} 109 110static 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 158struct vm_area_struct; 159 160/* 161 * This much address space is reserved for vmalloc() and iomap() 162 * as well as fixmap mappings. 163 */ 164extern unsigned int __VMALLOC_RESERVE; 165 166extern int sysctl_legacy_va_layout; 167 168extern 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