include/asm-x86/page_32.h

   1 #ifndef _ASM_X86_PAGE_32_H
   2 #define _ASM_X86_PAGE_32_H
   3
   4 /*
   5  * This handles the memory map.
   6  *
   7  * A __PAGE_OFFSET of 0xC0000000 means that the kernel has
   8  * a virtual address space of one gigabyte, which limits the
   9  * amount of physical memory you can use to about 950MB.
  10  *
  11  * If you want more physical memory than this then see the CONFIG_HIGHMEM4G
  12  * and CONFIG_HIGHMEM64G options in the kernel configuration.
  13  */
  14 #define __PAGE_OFFSET           _AC(CONFIG_PAGE_OFFSET, UL)
  15
  16 #ifdef CONFIG_X86_PAE
  17 #define __PHYSICAL_MASK_SHIFT   36
  18 #define __VIRTUAL_MASK_SHIFT    32
  19 #define PAGETABLE_LEVELS        3
  20
  21 #ifndef __ASSEMBLY__
  22 typedef u64     pteval_t;
  23 typedef u64     pmdval_t;
  24 typedef u64     pudval_t;
  25 typedef u64     pgdval_t;
  26 typedef u64     pgprotval_t;
  27 typedef u64     phys_addr_t;
  28
  29 typedef union {
  30         struct {
  31                 unsigned long pte_low, pte_high;
  32         };
  33         pteval_t pte;
  34 } pte_t;
  35 #endif  /* __ASSEMBLY__
  36  */
  37 #else  /* !CONFIG_X86_PAE */
  38 #define __PHYSICAL_MASK_SHIFT   32
  39 #define __VIRTUAL_MASK_SHIFT    32
  40 #define PAGETABLE_LEVELS        2
  41
  42 #ifndef __ASSEMBLY__
  43 typedef unsigned long   pteval_t;
  44 typedef unsigned long   pmdval_t;
  45 typedef unsigned long   pudval_t;
  46 typedef unsigned long   pgdval_t;
  47 typedef unsigned long   pgprotval_t;
  48 typedef unsigned long   phys_addr_t;
  49
  50 typedef union {
  51         pteval_t pte;
  52         pteval_t pte_low;
  53 } pte_t;
  54
  55 #endif  /* __ASSEMBLY__ */
  56 #endif  /* CONFIG_X86_PAE */
  57
  58 #ifndef __ASSEMBLY__
  59 typedef struct page *pgtable_t;
  60 #endif
  61
  62 #ifdef CONFIG_HUGETLB_PAGE
  63 #define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
  64 #endif
  65
  66 #ifndef __ASSEMBLY__
  67 #define __phys_addr(x)          ((x) - PAGE_OFFSET)
  68 #define __phys_reloc_hide(x)    RELOC_HIDE((x), 0)
  69
  70 #ifdef CONFIG_FLATMEM
  71 #define pfn_valid(pfn)          ((pfn) < max_mapnr)
  72 #endif /* CONFIG_FLATMEM */
  73
  74 extern int nx_enabled;
  75
  76 /*
  77  * This much address space is reserved for vmalloc() and iomap()
  78  * as well as fixmap mappings.
  79  */
  80 extern unsigned int __VMALLOC_RESERVE;
  81 extern int sysctl_legacy_va_layout;
  82
  83 #define VMALLOC_RESERVE         ((unsigned long)__VMALLOC_RESERVE)
  84 #define MAXMEM                  (-__PAGE_OFFSET - __VMALLOC_RESERVE)
  85
  86 #ifdef CONFIG_X86_USE_3DNOW
  87 #include <asm/mmx.h>
  88
  89 static inline void clear_page(void *page)
  90 {
  91         mmx_clear_page(page);
  92 }
  93
  94 static inline void copy_page(void *to, void *from)
  95 {
  96         mmx_copy_page(to, from);
  97 }
  98 #else  /* !CONFIG_X86_USE_3DNOW */
  99 #include <linux/string.h>
 100
 101 static inline void clear_page(void *page)
 102 {
 103         memset(page, 0, PAGE_SIZE);
 104 }
 105
 106 static inline void copy_page(void *to, void *from)
 107 {
 108         memcpy(to, from, PAGE_SIZE);
 109 }
 110 #endif  /* CONFIG_X86_3DNOW */
 111 #endif  /* !__ASSEMBLY__ */
 112
 113 #endif /* _ASM_X86_PAGE_32_H */