release/src-rt-6.x/linux/linux-2.6/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(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 extern unsigned long long __supported_pte_mask;
  48 typedef struct { unsigned long pte_low, pte_high; } pte_t;
  49 typedef struct { unsigned long long pmd; } pmd_t;
  50 typedef struct { unsigned long long pgd; } pgd_t;
  51 typedef struct { unsigned long long pgprot; } pgprot_t;
  52
  53 static inline unsigned long long native_pgd_val(pgd_t pgd)
  54 {
  55         return pgd.pgd;
  56 }
  57
  58 static inline unsigned long long native_pmd_val(pmd_t pmd)
  59 {
  60         return pmd.pmd;
  61 }
  62
  63 static inline unsigned long long native_pte_val(pte_t pte)
  64 {
  65         return pte.pte_low | ((unsigned long long)pte.pte_high << 32);
  66 }
  67
  68 static inline pgd_t native_make_pgd(unsigned long long val)
  69 {
  70         return (pgd_t) { val };
  71 }
  72
  73 static inline pmd_t native_make_pmd(unsigned long long val)
  74 {
  75         return (pmd_t) { val };
  76 }
  77
  78 static inline pte_t native_make_pte(unsigned long long val)
  79 {
  80         return (pte_t) { .pte_low = val, .pte_high = (val >> 32) } ;
  81 }
  82
  83 #ifndef CONFIG_PARAVIRT
  84 #define pmd_val(x)      native_pmd_val(x)
  85 #define __pmd(x)        native_make_pmd(x)
  86 #endif
  87
  88 #define HPAGE_SHIFT     21
  89 #include <asm-generic/pgtable-nopud.h>
  90 #else  /* !CONFIG_X86_PAE */
  91 typedef struct { unsigned long pte_low; } pte_t;
  92 typedef struct { unsigned long pgd; } pgd_t;
  93 typedef struct { unsigned long pgprot; } pgprot_t;
  94 #define boot_pte_t pte_t /* or would you rather have a typedef */
  95
  96 static inline unsigned long native_pgd_val(pgd_t pgd)
  97 {
  98         return pgd.pgd;
  99 }
 100
 101 static inline unsigned long native_pte_val(pte_t pte)
 102 {
 103         return pte.pte_low;
 104 }
 105
 106 static inline pgd_t native_make_pgd(unsigned long val)
 107 {
 108         return (pgd_t) { val };
 109 }
 110
 111 static inline pte_t native_make_pte(unsigned long val)
 112 {
 113         return (pte_t) { .pte_low = val };
 114 }
 115
 116 #define HPAGE_SHIFT     22
 117 #include <asm-generic/pgtable-nopmd.h>
 118 #endif  /* CONFIG_X86_PAE */
 119
 120 #define PTE_MASK        PAGE_MASK
 121
 122 #ifdef CONFIG_HUGETLB_PAGE
 123 #define HPAGE_SIZE      ((1UL) << HPAGE_SHIFT)
 124 #define HPAGE_MASK      (~(HPAGE_SIZE - 1))
 125 #define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)
 126 #define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
 127 #endif
 128
 129 #define pgprot_val(x)   ((x).pgprot)
 130 #define __pgprot(x)     ((pgprot_t) { (x) } )
 131
 132 #ifndef CONFIG_PARAVIRT
 133 #define pgd_val(x)      native_pgd_val(x)
 134 #define __pgd(x)        native_make_pgd(x)
 135 #define pte_val(x)      native_pte_val(x)
 136 #define __pte(x)        native_make_pte(x)
 137 #endif
 138
 139 #endif /* !__ASSEMBLY__ */
 140
 141 /* to align the pointer to the (next) page boundary */
 142 #define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
 143
 144 /*
 145  * This handles the memory map.. We could make this a config
 146  * option, but too many people screw it up, and too few need
 147  * it.
 148  *
 149  * A __PAGE_OFFSET of 0xC0000000 means that the kernel has
 150  * a virtual address space of one gigabyte, which limits the
 151  * amount of physical memory you can use to about 950MB.
 152  *
 153  * If you want more physical memory than this then see the CONFIG_HIGHMEM4G
 154  * and CONFIG_HIGHMEM64G options in the kernel configuration.
 155  */
 156
 157 #ifndef __ASSEMBLY__
 158
 159 struct vm_area_struct;
 160
 161 /*
 162  * This much address space is reserved for vmalloc() and iomap()
 163  * as well as fixmap mappings.
 164  */
 165 extern unsigned int __VMALLOC_RESERVE;
 166
 167 extern int sysctl_legacy_va_layout;
 168
 169 extern int page_is_ram(unsigned long pagenr);
 170
 171 #endif /* __ASSEMBLY__ */
 172
 173 #ifdef __ASSEMBLY__
 174 #define __PAGE_OFFSET           CONFIG_PAGE_OFFSET
 175 #else
 176 #define __PAGE_OFFSET           ((unsigned long)CONFIG_PAGE_OFFSET)
 177 #endif
 178
 179
 180 #define PAGE_OFFSET             ((unsigned long)__PAGE_OFFSET)
 181 #define VMALLOC_RESERVE         ((unsigned long)__VMALLOC_RESERVE)
 182 #define MAXMEM                  (-__PAGE_OFFSET-__VMALLOC_RESERVE)
 183 #define __pa(x)                 ((unsigned long)(x)-PAGE_OFFSET)
 184 /* __pa_symbol should be used for C visible symbols.
 185    This seems to be the official gcc blessed way to do such arithmetic. */
 186 #define __pa_symbol(x)          __pa(RELOC_HIDE((unsigned long)(x),0))
 187 #define __va(x)                 ((void *)((unsigned long)(x)+PAGE_OFFSET))
 188 #define pfn_to_kaddr(pfn)      __va((pfn) << PAGE_SHIFT)
 189 #ifdef CONFIG_FLATMEM
 190 #define pfn_valid(pfn)          ((pfn) < max_mapnr)
 191 #endif /* CONFIG_FLATMEM */
 192 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 193
 194 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 195
 196 #define VM_DATA_DEFAULT_FLAGS \
 197         (VM_READ | VM_WRITE | \
 198         ((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0 ) | \
 199                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 200
 201 #include <asm-generic/memory_model.h>
 202 #include <asm-generic/page.h>
 203
 204 #define __HAVE_ARCH_GATE_AREA 1
 205 #endif /* __KERNEL__ */
 206
 207 #endif /* _I386_PAGE_H */