1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_X86_PAGE_64_DEFS_H
3 #define _ASM_X86_PAGE_64_DEFS_H
10 #define KASAN_STACK_ORDER 1
12 #define KASAN_STACK_ORDER 0
15 #define THREAD_SIZE_ORDER (2 + KASAN_STACK_ORDER)
16 #define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
18 #define EXCEPTION_STACK_ORDER (0 + KASAN_STACK_ORDER)
19 #define EXCEPTION_STKSZ (PAGE_SIZE << EXCEPTION_STACK_ORDER)
21 #define IRQ_STACK_ORDER (2 + KASAN_STACK_ORDER)
22 #define IRQ_STACK_SIZE (PAGE_SIZE << IRQ_STACK_ORDER)
25 * The index for the tss.ist[] array. The hardware limit is 7 entries.
27 #define IST_INDEX_DF 0
28 #define IST_INDEX_NMI 1
29 #define IST_INDEX_DB 2
30 #define IST_INDEX_MCE 3
33 * Set __PAGE_OFFSET to the most negative possible address +
34 * PGDIR_SIZE*17 (pgd slot 273).
36 * The gap is to allow a space for LDT remap for PTI (1 pgd slot) and space for
37 * a hypervisor (16 slots). Choosing 16 slots for a hypervisor is arbitrary,
38 * but it's what Xen requires.
40 #define __PAGE_OFFSET_BASE_L5 _AC(0xff11000000000000, UL)
41 #define __PAGE_OFFSET_BASE_L4 _AC(0xffff888000000000, UL)
43 #ifdef CONFIG_DYNAMIC_MEMORY_LAYOUT
44 #define __PAGE_OFFSET page_offset_base
46 #define __PAGE_OFFSET __PAGE_OFFSET_BASE_L4
47 #endif /* CONFIG_DYNAMIC_MEMORY_LAYOUT */
49 #define __START_KERNEL_map _AC(0xffffffff80000000, UL)
51 /* See Documentation/x86/x86_64/mm.rst for a description of the memory map. */
53 #define __PHYSICAL_MASK_SHIFT 52
55 #ifdef CONFIG_X86_5LEVEL
56 #define __VIRTUAL_MASK_SHIFT (pgtable_l5_enabled() ? 56 : 47)
58 #define __VIRTUAL_MASK_SHIFT 47
62 * Maximum kernel image size is limited to 1 GiB, due to the fixmap living
63 * in the next 1 GiB (see level2_kernel_pgt in arch/x86/kernel/head_64.S).
65 * On KASLR use 1 GiB by default, leaving 1 GiB for modules once the
66 * page tables are fully set up.
68 * If KASLR is disabled we can shrink it to 0.5 GiB and increase the size
69 * of the modules area to 1.5 GiB.
71 #ifdef CONFIG_RANDOMIZE_BASE
72 #define KERNEL_IMAGE_SIZE (1024 * 1024 * 1024)
74 #define KERNEL_IMAGE_SIZE (512 * 1024 * 1024)
77 #endif /* _ASM_X86_PAGE_64_DEFS_H */