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 18 #define EXCEPTION_STACK_ORDER (1 + KASAN_STACK_ORDER) 19 #define EXCEPTION_STKSZ (PAGE_SIZE << EXCEPTION_STACK_ORDER) 20 21 #define IRQ_STACK_ORDER (2 + KASAN_STACK_ORDER) 22 #define IRQ_STACK_SIZE (PAGE_SIZE << IRQ_STACK_ORDER) 23 24 /* 25 * The index for the tss.ist[] array. The hardware limit is 7 entries. 26 */ 27 #define IST_INDEX_DF 0 28 #define IST_INDEX_NMI 1 29 #define IST_INDEX_DB 2 30 #define IST_INDEX_MCE 3 31 32 /* 33 * Set __PAGE_OFFSET to the most negative possible address + 34 * PGDIR_SIZE*17 (pgd slot 273). 35 * 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. 39 */ 40 #define __PAGE_OFFSET_BASE_L5 _AC(0xff11000000000000, UL) 41 #define __PAGE_OFFSET_BASE_L4 _AC(0xffff888000000000, 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.rst 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 * 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). 64 * 65 * On KASLR use 1 GiB by default, leaving 1 GiB for modules once the 66 * page tables are fully set up. 67 * 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. 70 */ 71 #ifdef CONFIG_RANDOMIZE_BASE 72 #define KERNEL_IMAGE_SIZE (1024 * 1024 * 1024) 73 #else 74 #define KERNEL_IMAGE_SIZE (512 * 1024 * 1024) 75 #endif 76 77 #endif /* _ASM_X86_PAGE_64_DEFS_H */ 78