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 { pteval_t pte, pte_low; } pte_t;
  51
  52 #endif  /* __ASSEMBLY__ */
  53 #endif  /* CONFIG_X86_PAE */
  54
  55 #ifndef __ASSEMBLY__
  56 typedef struct page *pgtable_t;
  57 #endif
  58
  59 #ifdef CONFIG_HUGETLB_PAGE
  60 #define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
  61 #endif
  62
  63 #ifndef __ASSEMBLY__
  64 #define __phys_addr(x)          ((x)-PAGE_OFFSET)
  65 #define __phys_reloc_hide(x)    RELOC_HIDE((x), 0)
  66
  67 #ifdef CONFIG_FLATMEM
  68 #define pfn_valid(pfn)          ((pfn) < max_mapnr)
  69 #endif /* CONFIG_FLATMEM */
  70
  71 extern int nx_enabled;
  72
  73 /*
  74  * This much address space is reserved for vmalloc() and iomap()
  75  * as well as fixmap mappings.
  76  */
  77 extern unsigned int __VMALLOC_RESERVE;
  78 extern int sysctl_legacy_va_layout;
  79
  80 #define VMALLOC_RESERVE         ((unsigned long)__VMALLOC_RESERVE)
  81 #define MAXMEM                  (-__PAGE_OFFSET-__VMALLOC_RESERVE)
  82
  83 #ifdef CONFIG_X86_USE_3DNOW
  84 #include <asm/mmx.h>
  85
  86 static inline void clear_page(void *page)
  87 {
  88         mmx_clear_page(page);
  89 }
  90
  91 static inline void copy_page(void *to, void *from)
  92 {
  93         mmx_copy_page(to, from);
  94 }
  95 #else  /* !CONFIG_X86_USE_3DNOW */
  96 #include <linux/string.h>
  97
  98 static inline void clear_page(void *page)
  99 {
 100         memset(page, 0, PAGE_SIZE);
 101 }
 102
 103 static inline void copy_page(void *to, void *from)
 104 {
 105         memcpy(to, from, PAGE_SIZE);
 106 }
 107 #endif  /* CONFIG_X86_3DNOW */
 108 #endif  /* !__ASSEMBLY__ */
 109
 110 #endif /* _ASM_X86_PAGE_32_H */