arch/x86/include/asm/page_64_types.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_X86_PAGE_64_DEFS_H
   3 #define _ASM_X86_PAGE_64_DEFS_H
   4
   5 #ifndef __ASSEMBLY__
   6 #include <asm/kaslr.h>
   7 #endif
   8
   9 #ifdef CONFIG_KASAN
  10 #define KASAN_STACK_ORDER 1
  11 #else
  12 #define KASAN_STACK_ORDER 0
  13 #endif
  14
  15 #define THREAD_SIZE_ORDER       (2 + KASAN_STACK_ORDER)
  16 #define THREAD_SIZE  (PAGE_SIZE << THREAD_SIZE_ORDER)
  17 #define CURRENT_MASK (~(THREAD_SIZE - 1))
  18
  19 #define EXCEPTION_STACK_ORDER (0 + KASAN_STACK_ORDER)
  20 #define EXCEPTION_STKSZ (PAGE_SIZE << EXCEPTION_STACK_ORDER)
  21
  22 #define DEBUG_STACK_ORDER (EXCEPTION_STACK_ORDER + 1)
  23 #define DEBUG_STKSZ (PAGE_SIZE << DEBUG_STACK_ORDER)
  24
  25 #define IRQ_STACK_ORDER (2 + KASAN_STACK_ORDER)
  26 #define IRQ_STACK_SIZE (PAGE_SIZE << IRQ_STACK_ORDER)
  27
  28 #define DOUBLEFAULT_STACK 1
  29 #define NMI_STACK 2
  30 #define DEBUG_STACK 3
  31 #define MCE_STACK 4
  32 #define N_EXCEPTION_STACKS 4  /* hw limit: 7 */
  33
  34 /*
  35  * Set __PAGE_OFFSET to the most negative possible address +
  36  * PGDIR_SIZE*16 (pgd slot 272).  The gap is to allow a space for a
  37  * hypervisor to fit.  Choosing 16 slots here is arbitrary, but it's
  38  * what Xen requires.
  39  */
  40 #ifdef CONFIG_X86_5LEVEL
  41 #define __PAGE_OFFSET_BASE      _AC(0xff10000000000000, UL)
  42 #else
  43 #define __PAGE_OFFSET_BASE      _AC(0xffff880000000000, UL)
  44 #endif
  45
  46 #ifdef CONFIG_RANDOMIZE_MEMORY
  47 #define __PAGE_OFFSET           page_offset_base
  48 #else
  49 #define __PAGE_OFFSET           __PAGE_OFFSET_BASE
  50 #endif /* CONFIG_RANDOMIZE_MEMORY */
  51
  52 #define __START_KERNEL_map      _AC(0xffffffff80000000, UL)
  53
  54 /* See Documentation/x86/x86_64/mm.txt for a description of the memory map. */
  55
  56 #define __PHYSICAL_MASK_SHIFT   52
  57
  58 #ifdef CONFIG_X86_5LEVEL
  59 #define __VIRTUAL_MASK_SHIFT    56
  60 #else
  61 #define __VIRTUAL_MASK_SHIFT    47
  62 #endif
  63
  64 /*
  65  * Kernel image size is limited to 1GiB due to the fixmap living in the
  66  * next 1GiB (see level2_kernel_pgt in arch/x86/kernel/head_64.S). Use
  67  * 512MiB by default, leaving 1.5GiB for modules once the page tables
  68  * are fully set up. If kernel ASLR is configured, it can extend the
  69  * kernel page table mapping, reducing the size of the modules area.
  70  */
  71 #if defined(CONFIG_RANDOMIZE_BASE)
  72 #define KERNEL_IMAGE_SIZE       (1024 * 1024 * 1024)
  73 #else
  74 #define KERNEL_IMAGE_SIZE       (512 * 1024 * 1024)
  75 #endif
  76
  77 #endif /* _ASM_X86_PAGE_64_DEFS_H */