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