LXR linux/arch/x86/include/asm/page_32

   1#ifndef _ASM_X86_PAGE_32_DEFS_H
   2#define _ASM_X86_PAGE_32_DEFS_H
   3
   4#include <linux/const.h>
   5
   6/*
   7 * This handles the memory map.
   8 *
   9 * A __PAGE_OFFSET of 0xC0000000 means that the kernel has
  10 * a virtual address space of one gigabyte, which limits the
  11 * amount of physical memory you can use to about 950MB.
  12 *
  13 * If you want more physical memory than this then see the CONFIG_HIGHMEM4G
  14 * and CONFIG_HIGHMEM64G options in the kernel configuration.
  15 */
  16#define __PAGE_OFFSET_BASE      _AC(CONFIG_PAGE_OFFSET, UL)
  17#define __PAGE_OFFSET           __PAGE_OFFSET_BASE
  18
  19#define __START_KERNEL_map      __PAGE_OFFSET
  20
  21#define THREAD_SIZE_ORDER       1
  22#define THREAD_SIZE             (PAGE_SIZE << THREAD_SIZE_ORDER)
  23
  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
  35#else  /* !CONFIG_X86_PAE */
  36#define __PHYSICAL_MASK_SHIFT   32
  37#define __VIRTUAL_MASK_SHIFT    32
  38#endif  /* CONFIG_X86_PAE */
  39
  40/*
  41 * Kernel image size is limited to 512 MB (see in arch/x86/kernel/head_32.S)
  42 */
  43#define KERNEL_IMAGE_SIZE       (512 * 1024 * 1024)
  44
  45#ifndef __ASSEMBLY__
  46
  47/*
  48 * This much address space is reserved for vmalloc() and iomap()
  49 * as well as fixmap mappings.
  50 */
  51extern unsigned int __VMALLOC_RESERVE;
  52extern int sysctl_legacy_va_layout;
  53
  54extern void find_low_pfn_range(void);
  55extern void setup_bootmem_allocator(void);
  56
  57#endif  /* !__ASSEMBLY__ */
  58
  59#endif /* _ASM_X86_PAGE_32_DEFS_H */
  60