1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_X86_PAGE_64_DEFS_H
3 #define _ASM_X86_PAGE_64_DEFS_H
10 #ifdef CONFIG_KASAN_EXTRA
11 #define KASAN_STACK_ORDER 2
13 #define KASAN_STACK_ORDER 1
16 #define KASAN_STACK_ORDER 0
19 #define THREAD_SIZE_ORDER (2 + KASAN_STACK_ORDER)
20 #define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
21 #define CURRENT_MASK (~(THREAD_SIZE - 1))
23 #define EXCEPTION_STACK_ORDER (0 + KASAN_STACK_ORDER)
24 #define EXCEPTION_STKSZ (PAGE_SIZE << EXCEPTION_STACK_ORDER)
26 #define DEBUG_STACK_ORDER (EXCEPTION_STACK_ORDER + 1)
27 #define DEBUG_STKSZ (PAGE_SIZE << DEBUG_STACK_ORDER)
29 #define IRQ_STACK_ORDER (2 + KASAN_STACK_ORDER)
30 #define IRQ_STACK_SIZE (PAGE_SIZE << IRQ_STACK_ORDER)
32 #define DOUBLEFAULT_STACK 1
36 #define N_EXCEPTION_STACKS 4 /* hw limit: 7 */
39 * Set __PAGE_OFFSET to the most negative possible address +
40 * PGDIR_SIZE*17 (pgd slot 273).
42 * The gap is to allow a space for LDT remap for PTI (1 pgd slot) and space for
43 * a hypervisor (16 slots). Choosing 16 slots for a hypervisor is arbitrary,
44 * but it's what Xen requires.
46 #define __PAGE_OFFSET_BASE_L5 _AC(0xff11000000000000, UL)
47 #define __PAGE_OFFSET_BASE_L4 _AC(0xffff888000000000, UL)
49 #ifdef CONFIG_DYNAMIC_MEMORY_LAYOUT
50 #define __PAGE_OFFSET page_offset_base
52 #define __PAGE_OFFSET __PAGE_OFFSET_BASE_L4
53 #endif /* CONFIG_DYNAMIC_MEMORY_LAYOUT */
55 #define __START_KERNEL_map _AC(0xffffffff80000000, UL)
57 /* See Documentation/x86/x86_64/mm.txt for a description of the memory map. */
59 #define __PHYSICAL_MASK_SHIFT 52
61 #ifdef CONFIG_X86_5LEVEL
62 #define __VIRTUAL_MASK_SHIFT (pgtable_l5_enabled() ? 56 : 47)
64 #define __VIRTUAL_MASK_SHIFT 47
68 * Maximum kernel image size is limited to 1 GiB, due to the fixmap living
69 * in the next 1 GiB (see level2_kernel_pgt in arch/x86/kernel/head_64.S).
71 * On KASLR use 1 GiB by default, leaving 1 GiB for modules once the
72 * page tables are fully set up.
74 * If KASLR is disabled we can shrink it to 0.5 GiB and increase the size
75 * of the modules area to 1.5 GiB.
77 #ifdef CONFIG_RANDOMIZE_BASE
78 #define KERNEL_IMAGE_SIZE (1024 * 1024 * 1024)
80 #define KERNEL_IMAGE_SIZE (512 * 1024 * 1024)
83 #endif /* _ASM_X86_PAGE_64_DEFS_H */