1 #ifndef _ASM_X86_PAGE_64_DEFS_H
2 #define _ASM_X86_PAGE_64_DEFS_H
5 #ifdef CONFIG_KASAN_EXTRA
6 #define KASAN_STACK_ORDER 2
8 #define KASAN_STACK_ORDER 1
11 #define KASAN_STACK_ORDER 0
14 #define THREAD_SIZE_ORDER (2 + KASAN_STACK_ORDER)
15 #define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
16 #define CURRENT_MASK (~(THREAD_SIZE - 1))
18 #define EXCEPTION_STACK_ORDER (0 + KASAN_STACK_ORDER)
19 #define EXCEPTION_STKSZ (PAGE_SIZE << EXCEPTION_STACK_ORDER)
21 #define DEBUG_STACK_ORDER (EXCEPTION_STACK_ORDER + 1)
22 #define DEBUG_STKSZ (PAGE_SIZE << DEBUG_STACK_ORDER)
24 #define IRQ_STACK_ORDER (2 + KASAN_STACK_ORDER)
25 #define IRQ_STACK_SIZE (PAGE_SIZE << IRQ_STACK_ORDER)
27 #define DOUBLEFAULT_STACK 1
31 #define N_EXCEPTION_STACKS 4 /* hw limit: 7 */
34 * Set __PAGE_OFFSET to the most negative possible address +
35 * PGDIR_SIZE*16 (pgd slot 272). The gap is to allow a space for a
36 * hypervisor to fit. Choosing 16 slots here is arbitrary, but it's
39 #define __PAGE_OFFSET _AC(0xffff880000000000, UL)
41 #define __START_KERNEL_map _AC(0xffffffff80000000, UL)
43 /* See Documentation/x86/x86_64/mm.txt for a description of the memory map. */
44 #define __PHYSICAL_MASK_SHIFT 46
45 #define __VIRTUAL_MASK_SHIFT 47
48 * Kernel image size is limited to 1GiB due to the fixmap living in the
49 * next 1GiB (see level2_kernel_pgt in arch/x86/kernel/head_64.S). Use
50 * 512MiB by default, leaving 1.5GiB for modules once the page tables
51 * are fully set up. If kernel ASLR is configured, it can extend the
52 * kernel page table mapping, reducing the size of the modules area.
54 #define KERNEL_IMAGE_SIZE_DEFAULT (512 * 1024 * 1024)
55 #if defined(CONFIG_RANDOMIZE_BASE) && \
56 CONFIG_RANDOMIZE_BASE_MAX_OFFSET > KERNEL_IMAGE_SIZE_DEFAULT
57 #define KERNEL_IMAGE_SIZE CONFIG_RANDOMIZE_BASE_MAX_OFFSET
59 #define KERNEL_IMAGE_SIZE KERNEL_IMAGE_SIZE_DEFAULT
62 #endif /* _ASM_X86_PAGE_64_DEFS_H */