include/asm-x86/page_64.h

   1 #ifndef _X86_64_PAGE_H
   2 #define _X86_64_PAGE_H
   3
   4 #define PAGETABLE_LEVELS        4
   5
   6 #define THREAD_ORDER    1
   7 #define THREAD_SIZE  (PAGE_SIZE << THREAD_ORDER)
   8 #define CURRENT_MASK (~(THREAD_SIZE - 1))
   9
  10 #define EXCEPTION_STACK_ORDER 0
  11 #define EXCEPTION_STKSZ (PAGE_SIZE << EXCEPTION_STACK_ORDER)
  12
  13 #define DEBUG_STACK_ORDER (EXCEPTION_STACK_ORDER + 1)
  14 #define DEBUG_STKSZ (PAGE_SIZE << DEBUG_STACK_ORDER)
  15
  16 #define IRQSTACK_ORDER 2
  17 #define IRQSTACKSIZE (PAGE_SIZE << IRQSTACK_ORDER)
  18
  19 #define STACKFAULT_STACK 1
  20 #define DOUBLEFAULT_STACK 2
  21 #define NMI_STACK 3
  22 #define DEBUG_STACK 4
  23 #define MCE_STACK 5
  24 #define N_EXCEPTION_STACKS 5  /* hw limit: 7 */
  25
  26 #define PUD_PAGE_SIZE           (_AC(1, UL) << PUD_SHIFT)
  27 #define PUD_PAGE_MASK           (~(PUD_PAGE_SIZE-1))
  28
  29 /*
  30  * Set __PAGE_OFFSET to the most negative possible address +
  31  * PGDIR_SIZE*16 (pgd slot 272).  The gap is to allow a space for a
  32  * hypervisor to fit.  Choosing 16 slots here is arbitrary, but it's
  33  * what Xen requires.
  34  */
  35 #define __PAGE_OFFSET           _AC(0xffff880000000000, UL)
  36
  37 #define __PHYSICAL_START        CONFIG_PHYSICAL_START
  38 #define __KERNEL_ALIGN          0x200000
  39
  40 /*
  41  * Make sure kernel is aligned to 2MB address. Catching it at compile
  42  * time is better. Change your config file and compile the kernel
  43  * for a 2MB aligned address (CONFIG_PHYSICAL_START)
  44  */
  45 #if (CONFIG_PHYSICAL_START % __KERNEL_ALIGN) != 0
  46 #error "CONFIG_PHYSICAL_START must be a multiple of 2MB"
  47 #endif
  48
  49 #define __START_KERNEL          (__START_KERNEL_map + __PHYSICAL_START)
  50 #define __START_KERNEL_map      _AC(0xffffffff80000000, UL)
  51
  52 /* See Documentation/x86_64/mm.txt for a description of the memory map. */
  53 #define __PHYSICAL_MASK_SHIFT   46
  54 #define __VIRTUAL_MASK_SHIFT    48
  55
  56 /*
  57  * Kernel image size is limited to 512 MB (see level2_kernel_pgt in
  58  * arch/x86/kernel/head_64.S), and it is mapped here:
  59  */
  60 #define KERNEL_IMAGE_SIZE       (512 * 1024 * 1024)
  61 #define KERNEL_IMAGE_START      _AC(0xffffffff80000000, UL)
  62
  63 #ifndef __ASSEMBLY__
  64 void clear_page(void *page);
  65 void copy_page(void *to, void *from);
  66
  67 /* duplicated to the one in bootmem.h */
  68 extern unsigned long max_pfn;
  69 extern unsigned long phys_base;
  70
  71 extern unsigned long __phys_addr(unsigned long);
  72 #define __phys_reloc_hide(x)    (x)
  73
  74 /*
  75  * These are used to make use of C type-checking..
  76  */
  77 typedef unsigned long   pteval_t;
  78 typedef unsigned long   pmdval_t;
  79 typedef unsigned long   pudval_t;
  80 typedef unsigned long   pgdval_t;
  81 typedef unsigned long   pgprotval_t;
  82 typedef unsigned long   phys_addr_t;
  83
  84 typedef struct page *pgtable_t;
  85
  86 typedef struct { pteval_t pte; } pte_t;
  87
  88 #define vmemmap ((struct page *)VMEMMAP_START)
  89
  90 extern unsigned long init_memory_mapping(unsigned long start,
  91                                          unsigned long end);
  92
  93 extern void initmem_init(unsigned long start_pfn, unsigned long end_pfn);
  94
  95 extern void init_extra_mapping_uc(unsigned long phys, unsigned long size);
  96 extern void init_extra_mapping_wb(unsigned long phys, unsigned long size);
  97
  98 #endif  /* !__ASSEMBLY__ */
  99
 100 #ifdef CONFIG_FLATMEM
 101 #define pfn_valid(pfn)          ((pfn) < max_pfn)
 102 #endif
 103
 104
 105 #endif /* _X86_64_PAGE_H */