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
  16 #ifdef CONFIG_X86_USE_3DNOW
  17
  18 #include <asm/mmx.h>
  19
  20 #define clear_page(page)        mmx_clear_page((void *)(page))
  21 #define copy_page(to,from)      mmx_copy_page(to,from)
  22
  23 #else
  24
  25 /*
  26  *      On older X86 processors it's not a win to use MMX here it seems.
  27  *      Maybe the K6-III ?
  28  */
  29
  30 #define clear_page(page)        memset((void *)(page), 0, PAGE_SIZE)
  31 #define copy_page(to,from)      memcpy((void *)(to), (void *)(from), PAGE_SIZE)
  32
  33 #endif
  34
  35 #define clear_user_page(page, vaddr, pg)        clear_page(page)
  36 #define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
  37
  38 #define alloc_zeroed_user_highpage(vma, vaddr) alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO, 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 #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 #define pmd_val(x)      ((x).pmd)
  52 #define pte_val(x)      ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
  53 #define __pmd(x) ((pmd_t) { (x) } )
  54 #define HPAGE_SHIFT     21
  55 #else
  56 typedef struct { unsigned long pte_low; } pte_t;
  57 typedef struct { unsigned long pgd; } pgd_t;
  58 typedef struct { unsigned long pgprot; } pgprot_t;
  59 #define boot_pte_t pte_t /* or would you rather have a typedef */
  60 #define pte_val(x)      ((x).pte_low)
  61 #define HPAGE_SHIFT     22
  62 #endif
  63 #define PTE_MASK        PAGE_MASK
  64
  65 #ifdef CONFIG_HUGETLB_PAGE
  66 #define HPAGE_SIZE      ((1UL) << HPAGE_SHIFT)
  67 #define HPAGE_MASK      (~(HPAGE_SIZE - 1))
  68 #define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)
  69 #define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
  70 #endif
  71
  72 #define pgd_val(x)      ((x).pgd)
  73 #define pgprot_val(x)   ((x).pgprot)
  74
  75 #define __pte(x) ((pte_t) { (x) } )
  76 #define __pgd(x) ((pgd_t) { (x) } )
  77 #define __pgprot(x)     ((pgprot_t) { (x) } )
  78
  79 #endif /* !__ASSEMBLY__ */
  80
  81 /* to align the pointer to the (next) page boundary */
  82 #define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
  83
  84 /*
  85  * This handles the memory map.. We could make this a config
  86  * option, but too many people screw it up, and too few need
  87  * it.
  88  *
  89  * A __PAGE_OFFSET of 0xC0000000 means that the kernel has
  90  * a virtual address space of one gigabyte, which limits the
  91  * amount of physical memory you can use to about 950MB.
  92  *
  93  * If you want more physical memory than this then see the CONFIG_HIGHMEM4G
  94  * and CONFIG_HIGHMEM64G options in the kernel configuration.
  95  */
  96
  97 #ifndef __ASSEMBLY__
  98
  99 /*
 100  * This much address space is reserved for vmalloc() and iomap()
 101  * as well as fixmap mappings.
 102  */
 103 extern unsigned int __VMALLOC_RESERVE;
 104
 105 extern int sysctl_legacy_va_layout;
 106
 107 extern int page_is_ram(unsigned long pagenr);
 108
 109 #endif /* __ASSEMBLY__ */
 110
 111 #ifdef __ASSEMBLY__
 112 #define __PAGE_OFFSET           CONFIG_PAGE_OFFSET
 113 #define __PHYSICAL_START        CONFIG_PHYSICAL_START
 114 #else
 115 #define __PAGE_OFFSET           ((unsigned long)CONFIG_PAGE_OFFSET)
 116 #define __PHYSICAL_START        ((unsigned long)CONFIG_PHYSICAL_START)
 117 #endif
 118 #define __KERNEL_START          (__PAGE_OFFSET + __PHYSICAL_START)
 119
 120
 121 #define PAGE_OFFSET             ((unsigned long)__PAGE_OFFSET)
 122 #define VMALLOC_RESERVE         ((unsigned long)__VMALLOC_RESERVE)
 123 #define MAXMEM                  (-__PAGE_OFFSET-__VMALLOC_RESERVE)
 124 #define __pa(x)                 ((unsigned long)(x)-PAGE_OFFSET)
 125 #define __va(x)                 ((void *)((unsigned long)(x)+PAGE_OFFSET))
 126 #define pfn_to_kaddr(pfn)      __va((pfn) << PAGE_SHIFT)
 127 #ifdef CONFIG_FLATMEM
 128 #define pfn_valid(pfn)          ((pfn) < max_mapnr)
 129 #endif /* CONFIG_FLATMEM */
 130 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 131
 132 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 133
 134 #define VM_DATA_DEFAULT_FLAGS \
 135         (VM_READ | VM_WRITE | \
 136         ((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0 ) | \
 137                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 138
 139 #include <asm-generic/memory_model.h>
 140 #include <asm-generic/page.h>
 141
 142 #endif /* __KERNEL__ */
 143
 144 #endif /* _I386_PAGE_H */