arch/x86/include/asm/page_32_types.h

   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           _AC(CONFIG_PAGE_OFFSET, UL)
  17
  18 #define __START_KERNEL_map      __PAGE_OFFSET
  19
  20 #define THREAD_SIZE_ORDER       1
  21 #define THREAD_SIZE             (PAGE_SIZE << THREAD_SIZE_ORDER)
  22
  23 #define DOUBLEFAULT_STACK 1
  24 #define NMI_STACK 0
  25 #define DEBUG_STACK 0
  26 #define MCE_STACK 0
  27 #define N_EXCEPTION_STACKS 1
  28
  29 #ifdef CONFIG_X86_PAE
  30 /* 44=32+12, the limit we can fit into an unsigned long pfn */
  31 #define __PHYSICAL_MASK_SHIFT   44
  32 #define __VIRTUAL_MASK_SHIFT    32
  33
  34 #else  /* !CONFIG_X86_PAE */
  35 #define __PHYSICAL_MASK_SHIFT   32
  36 #define __VIRTUAL_MASK_SHIFT    32
  37 #endif  /* CONFIG_X86_PAE */
  38
  39 /*
  40  * Kernel image size is limited to 512 MB (see in arch/x86/kernel/head_32.S)
  41  */
  42 #define KERNEL_IMAGE_SIZE       (512 * 1024 * 1024)
  43
  44 #ifndef __ASSEMBLY__
  45
  46 /*
  47  * This much address space is reserved for vmalloc() and iomap()
  48  * as well as fixmap mappings.
  49  */
  50 extern unsigned int __VMALLOC_RESERVE;
  51 extern int sysctl_legacy_va_layout;
  52
  53 extern void find_low_pfn_range(void);
  54 extern void setup_bootmem_allocator(void);
  55
  56 #endif  /* !__ASSEMBLY__ */
  57
  58 #endif /* _ASM_X86_PAGE_32_DEFS_H */