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*17 (pgd slot 273).
  37  *
  38  * The gap is to allow a space for LDT remap for PTI (1 pgd slot) and space for
  39  * a hypervisor (16 slots). Choosing 16 slots for a hypervisor is arbitrary,
  40  * but it's what Xen requires.
  41  */
  42 #define __PAGE_OFFSET_BASE_L5   _AC(0xff11000000000000, UL)
  43 #define __PAGE_OFFSET_BASE_L4   _AC(0xffff888000000000, UL)
  44
  45 #ifdef CONFIG_DYNAMIC_MEMORY_LAYOUT
  46 #define __PAGE_OFFSET           page_offset_base
  47 #else
  48 #define __PAGE_OFFSET           __PAGE_OFFSET_BASE_L4
  49 #endif /* CONFIG_DYNAMIC_MEMORY_LAYOUT */
  50
  51 #define __START_KERNEL_map      _AC(0xffffffff80000000, UL)
  52
  53 /* See Documentation/x86/x86_64/mm.txt for a description of the memory map. */
  54
  55 #define __PHYSICAL_MASK_SHIFT   52
  56
  57 #ifdef CONFIG_X86_5LEVEL
  58 #define __VIRTUAL_MASK_SHIFT    (pgtable_l5_enabled() ? 56 : 47)
  59 #else
  60 #define __VIRTUAL_MASK_SHIFT    47
  61 #endif
  62
  63 /*
  64  * Maximum kernel image size is limited to 1 GiB, due to the fixmap living
  65  * in the next 1 GiB (see level2_kernel_pgt in arch/x86/kernel/head_64.S).
  66  *
  67  * On KASLR use 1 GiB by default, leaving 1 GiB for modules once the
  68  * page tables are fully set up.
  69  *
  70  * If KASLR is disabled we can shrink it to 0.5 GiB and increase the size
  71  * of the modules area to 1.5 GiB.
  72  */
  73 #ifdef CONFIG_RANDOMIZE_BASE
  74 #define KERNEL_IMAGE_SIZE       (1024 * 1024 * 1024)
  75 #else
  76 #define KERNEL_IMAGE_SIZE       (512 * 1024 * 1024)
  77 #endif
  78
  79 #endif /* _ASM_X86_PAGE_64_DEFS_H */