arch/x86/include/asm/page_64_types.h

   1 #ifndef _ASM_X86_PAGE_64_DEFS_H
   2 #define _ASM_X86_PAGE_64_DEFS_H
   3
   4 #ifndef __ASSEMBLY__
   5 #include <asm/kaslr.h>
   6 #endif
   7
   8 #ifdef CONFIG_KASAN
   9 #define KASAN_STACK_ORDER 1
  10 #else
  11 #define KASAN_STACK_ORDER 0
  12 #endif
  13
  14 #define THREAD_SIZE_ORDER       (2 + KASAN_STACK_ORDER)
  15 #define THREAD_SIZE  (PAGE_SIZE << THREAD_SIZE_ORDER)
  16 #define CURRENT_MASK (~(THREAD_SIZE - 1))
  17
  18 #define EXCEPTION_STACK_ORDER (0 + KASAN_STACK_ORDER)
  19 #define EXCEPTION_STKSZ (PAGE_SIZE << EXCEPTION_STACK_ORDER)
  20
  21 #define DEBUG_STACK_ORDER (EXCEPTION_STACK_ORDER + 1)
  22 #define DEBUG_STKSZ (PAGE_SIZE << DEBUG_STACK_ORDER)
  23
  24 #define IRQ_STACK_ORDER (2 + KASAN_STACK_ORDER)
  25 #define IRQ_STACK_SIZE (PAGE_SIZE << IRQ_STACK_ORDER)
  26
  27 #define DOUBLEFAULT_STACK 1
  28 #define NMI_STACK 2
  29 #define DEBUG_STACK 3
  30 #define MCE_STACK 4
  31 #define N_EXCEPTION_STACKS 4  /* hw limit: 7 */
  32
  33 /*
  34  * Set __PAGE_OFFSET to the most negative possible address +
  35  * PGDIR_SIZE*16 (pgd slot 272).  The gap is to allow a space for a
  36  * hypervisor to fit.  Choosing 16 slots here is arbitrary, but it's
  37  * what Xen requires.
  38  */
  39 #define __PAGE_OFFSET_BASE      _AC(0xffff880000000000, UL)
  40 #ifdef CONFIG_RANDOMIZE_MEMORY
  41 #define __PAGE_OFFSET           page_offset_base
  42 #else
  43 #define __PAGE_OFFSET           __PAGE_OFFSET_BASE
  44 #endif /* CONFIG_RANDOMIZE_MEMORY */
  45
  46 #define __START_KERNEL_map      _AC(0xffffffff80000000, UL)
  47
  48 /* See Documentation/x86/x86_64/mm.txt for a description of the memory map. */
  49 #define __PHYSICAL_MASK_SHIFT   46
  50 #define __VIRTUAL_MASK_SHIFT    47
  51
  52 /*
  53  * Kernel image size is limited to 1GiB due to the fixmap living in the
  54  * next 1GiB (see level2_kernel_pgt in arch/x86/kernel/head_64.S). Use
  55  * 512MiB by default, leaving 1.5GiB for modules once the page tables
  56  * are fully set up. If kernel ASLR is configured, it can extend the
  57  * kernel page table mapping, reducing the size of the modules area.
  58  */
  59 #if defined(CONFIG_RANDOMIZE_BASE)
  60 #define KERNEL_IMAGE_SIZE       (1024 * 1024 * 1024)
  61 #else
  62 #define KERNEL_IMAGE_SIZE       (512 * 1024 * 1024)
  63 #endif
  64
  65 #endif /* _ASM_X86_PAGE_64_DEFS_H */