include/asm-i386/page.h

   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  */
  43 extern int nx_enabled;
  44
  45 #ifdef CONFIG_X86_PAE
  46 extern unsigned long long __supported_pte_mask;
  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 */