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#define __PAGE_OFFSET_BASE_L5 _AC(0xff10000000000000, UL)
41#define __PAGE_OFFSET_BASE_L4 _AC(0xffff880000000000, UL)
42
43#ifdef CONFIG_DYNAMIC_MEMORY_LAYOUT
44#define __PAGE_OFFSET page_offset_base
45#else
46#define __PAGE_OFFSET __PAGE_OFFSET_BASE_L4
47#endif /* CONFIG_DYNAMIC_MEMORY_LAYOUT */
48
49#define __START_KERNEL_map _AC(0xffffffff80000000, UL)
50
51/* See Documentation/x86/x86_64/mm.txt for a description of the memory map. */
52
53#define __PHYSICAL_MASK_SHIFT 52
54
55#ifdef CONFIG_X86_5LEVEL
56#define __VIRTUAL_MASK_SHIFT (pgtable_l5_enabled() ? 56 : 47)
57#else
58#define __VIRTUAL_MASK_SHIFT 47
59#endif
60
61/*
62 * Kernel image size is limited to 1GiB due to the fixmap living in the
63 * next 1GiB (see level2_kernel_pgt in arch/x86/kernel/head_64.S). Use
64 * 512MiB by default, leaving 1.5GiB for modules once the page tables
65 * are fully set up. If kernel ASLR is configured, it can extend the
66 * kernel page table mapping, reducing the size of the modules area.
67 */
68#if defined(CONFIG_RANDOMIZE_BASE)
69#define KERNEL_IMAGE_SIZE (1024 * 1024 * 1024)
70#else
71#define KERNEL_IMAGE_SIZE (512 * 1024 * 1024)
72#endif
73
74#endif /* _ASM_X86_PAGE_64_DEFS_H */
75