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