arch/x86/include/asm/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_4KSTACKS
  17 #define THREAD_ORDER    0
  18 #else
  19 #define THREAD_ORDER    1
  20 #endif
  21 #define THREAD_SIZE     (PAGE_SIZE << THREAD_ORDER)
  22
  23 #define STACKFAULT_STACK 0
  24 #define DOUBLEFAULT_STACK 1
  25 #define NMI_STACK 0
  26 #define DEBUG_STACK 0
  27 #define MCE_STACK 0
  28 #define N_EXCEPTION_STACKS 1
  29
  30 #ifdef CONFIG_X86_PAE
  31 /* 44=32+12, the limit we can fit into an unsigned long pfn */
  32 #define __PHYSICAL_MASK_SHIFT   44
  33 #define __VIRTUAL_MASK_SHIFT    32
  34 #define PAGETABLE_LEVELS        3
  35
  36 #ifndef __ASSEMBLY__
  37 typedef u64     pteval_t;
  38 typedef u64     pmdval_t;
  39 typedef u64     pudval_t;
  40 typedef u64     pgdval_t;
  41 typedef u64     pgprotval_t;
  42
  43 typedef union {
  44         struct {
  45                 unsigned long pte_low, pte_high;
  46         };
  47         pteval_t pte;
  48 } pte_t;
  49 #endif  /* __ASSEMBLY__
  50  */
  51 #else  /* !CONFIG_X86_PAE */
  52 #define __PHYSICAL_MASK_SHIFT   32
  53 #define __VIRTUAL_MASK_SHIFT    32
  54 #define PAGETABLE_LEVELS        2
  55
  56 #ifndef __ASSEMBLY__
  57 typedef unsigned long   pteval_t;
  58 typedef unsigned long   pmdval_t;
  59 typedef unsigned long   pudval_t;
  60 typedef unsigned long   pgdval_t;
  61 typedef unsigned long   pgprotval_t;
  62
  63 typedef union {
  64         pteval_t pte;
  65         pteval_t pte_low;
  66 } pte_t;
  67
  68 #endif  /* __ASSEMBLY__ */
  69 #endif  /* CONFIG_X86_PAE */
  70
  71 #ifndef __ASSEMBLY__
  72 typedef struct page *pgtable_t;
  73 #endif
  74
  75 #ifdef CONFIG_HUGETLB_PAGE
  76 #define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
  77 #endif
  78
  79 #ifndef __ASSEMBLY__
  80 #define __phys_addr_nodebug(x)  ((x) - PAGE_OFFSET)
  81 #ifdef CONFIG_DEBUG_VIRTUAL
  82 extern unsigned long __phys_addr(unsigned long);
  83 #else
  84 #define __phys_addr(x)          __phys_addr_nodebug(x)
  85 #endif
  86 #define __phys_reloc_hide(x)    RELOC_HIDE((x), 0)
  87
  88 #ifdef CONFIG_FLATMEM
  89 #define pfn_valid(pfn)          ((pfn) < max_mapnr)
  90 #endif /* CONFIG_FLATMEM */
  91
  92 extern int nx_enabled;
  93
  94 /*
  95  * This much address space is reserved for vmalloc() and iomap()
  96  * as well as fixmap mappings.
  97  */
  98 extern unsigned int __VMALLOC_RESERVE;
  99 extern int sysctl_legacy_va_layout;
 100
 101 extern void find_low_pfn_range(void);
 102 extern unsigned long init_memory_mapping(unsigned long start,
 103                                          unsigned long end);
 104 extern void initmem_init(unsigned long, unsigned long);
 105 extern void free_initmem(void);
 106 extern void setup_bootmem_allocator(void);
 107
 108
 109 #ifdef CONFIG_X86_USE_3DNOW
 110 #include <asm/mmx.h>
 111
 112 static inline void clear_page(void *page)
 113 {
 114         mmx_clear_page(page);
 115 }
 116
 117 static inline void copy_page(void *to, void *from)
 118 {
 119         mmx_copy_page(to, from);
 120 }
 121 #else  /* !CONFIG_X86_USE_3DNOW */
 122 #include <linux/string.h>
 123
 124 static inline void clear_page(void *page)
 125 {
 126         memset(page, 0, PAGE_SIZE);
 127 }
 128
 129 static inline void copy_page(void *to, void *from)
 130 {
 131         memcpy(to, from, PAGE_SIZE);
 132 }
 133 #endif  /* CONFIG_X86_3DNOW */
 134 #endif  /* !__ASSEMBLY__ */
 135
 136 #endif /* ASM_X86__PAGE_32_H */