1 #ifndef _ASM_X86_PAGE_64_DEFS_H
2 #define _ASM_X86_PAGE_64_DEFS_H
9 #ifdef CONFIG_KASAN_EXTRA
10 #define KASAN_STACK_ORDER 2
12 #define KASAN_STACK_ORDER 1
15 #define KASAN_STACK_ORDER 0
18 #define THREAD_SIZE_ORDER (2 + KASAN_STACK_ORDER)
19 #define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
20 #define CURRENT_MASK (~(THREAD_SIZE - 1))
22 #define EXCEPTION_STACK_ORDER (1 + KASAN_STACK_ORDER)
23 #define EXCEPTION_STKSZ (PAGE_SIZE << EXCEPTION_STACK_ORDER)
25 #define DEBUG_STACK_ORDER (EXCEPTION_STACK_ORDER + 1)
26 #define DEBUG_STKSZ (PAGE_SIZE << DEBUG_STACK_ORDER)
28 #define IRQ_STACK_ORDER (2 + KASAN_STACK_ORDER)
29 #define IRQ_STACK_SIZE (PAGE_SIZE << IRQ_STACK_ORDER)
31 #define DOUBLEFAULT_STACK 1
35 #define N_EXCEPTION_STACKS 4 /* hw limit: 7 */
38 * Set __PAGE_OFFSET to the most negative possible address +
39 * PGDIR_SIZE*16 (pgd slot 272). The gap is to allow a space for a
40 * hypervisor to fit. Choosing 16 slots here is arbitrary, but it's
43 #define __PAGE_OFFSET_BASE _AC(0xffff880000000000, UL)
44 #ifdef CONFIG_RANDOMIZE_MEMORY
45 #define __PAGE_OFFSET page_offset_base
47 #define __PAGE_OFFSET __PAGE_OFFSET_BASE
48 #endif /* CONFIG_RANDOMIZE_MEMORY */
50 #define __START_KERNEL_map _AC(0xffffffff80000000, UL)
52 /* See Documentation/x86/x86_64/mm.txt for a description of the memory map. */
53 #define __PHYSICAL_MASK_SHIFT 46
54 #define __VIRTUAL_MASK_SHIFT 47
57 * Kernel image size is limited to 1GiB due to the fixmap living in the
58 * next 1GiB (see level2_kernel_pgt in arch/x86/kernel/head_64.S). Use
59 * 512MiB by default, leaving 1.5GiB for modules once the page tables
60 * are fully set up. If kernel ASLR is configured, it can extend the
61 * kernel page table mapping, reducing the size of the modules area.
63 #if defined(CONFIG_RANDOMIZE_BASE)
64 #define KERNEL_IMAGE_SIZE (1024 * 1024 * 1024)
66 #define KERNEL_IMAGE_SIZE (512 * 1024 * 1024)
69 #endif /* _ASM_X86_PAGE_64_DEFS_H */