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 #define IST_INDEX_VC 4 32 33 /* 34 * Set __PAGE_OFFSET to the most negative possible address + 35 * PGDIR_SIZE*17 (pgd slot 273). 36 * 37 * The gap is to allow a space for LDT remap for PTI (1 pgd slot) and space for 38 * a hypervisor (16 slots). Choosing 16 slots for a hypervisor is arbitrary, 39 * but it's what Xen requires. 40 */ 41 #define __PAGE_OFFSET_BASE_L5 _AC(0xff11000000000000, UL) 42 #define __PAGE_OFFSET_BASE_L4 _AC(0xffff888000000000, UL) 43 44 #ifdef CONFIG_DYNAMIC_MEMORY_LAYOUT 45 #define __PAGE_OFFSET page_offset_base 46 #else 47 #define __PAGE_OFFSET __PAGE_OFFSET_BASE_L4 48 #endif /* CONFIG_DYNAMIC_MEMORY_LAYOUT */ 49 50 #define __START_KERNEL_map _AC(0xffffffff80000000, UL) 51 52 /* See Documentation/x86/x86_64/mm.rst for a description of the memory map. */ 53 54 #define __PHYSICAL_MASK_SHIFT 52 55 56 #ifdef CONFIG_X86_5LEVEL 57 #define __VIRTUAL_MASK_SHIFT (pgtable_l5_enabled() ? 56 : 47) 58 /* See task_size_max() in <asm/page_64.h> */ 59 #else 60 #define __VIRTUAL_MASK_SHIFT 47 61 #define task_size_max() ((_AC(1,UL) << __VIRTUAL_MASK_SHIFT) - PAGE_SIZE) 62 #endif 63 64 #define TASK_SIZE_MAX task_size_max() 65 #define DEFAULT_MAP_WINDOW ((1UL << 47) - PAGE_SIZE) 66 67 /* This decides where the kernel will search for a free chunk of vm 68 * space during mmap's. 69 */ 70 #define IA32_PAGE_OFFSET ((current->personality & ADDR_LIMIT_3GB) ? \ 71 0xc0000000 : 0xFFFFe000) 72 73 #define TASK_SIZE_LOW (test_thread_flag(TIF_ADDR32) ? \ 74 IA32_PAGE_OFFSET : DEFAULT_MAP_WINDOW) 75 #define TASK_SIZE (test_thread_flag(TIF_ADDR32) ? \ 76 IA32_PAGE_OFFSET : TASK_SIZE_MAX) 77 #define TASK_SIZE_OF(child) ((test_tsk_thread_flag(child, TIF_ADDR32)) ? \ 78 IA32_PAGE_OFFSET : TASK_SIZE_MAX) 79 80 #define STACK_TOP TASK_SIZE_LOW 81 #define STACK_TOP_MAX TASK_SIZE_MAX 82 83 /* 84 * In spite of the name, KERNEL_IMAGE_SIZE is a limit on the maximum virtual 85 * address for the kernel image, rather than the limit on the size itself. 86 * This can be at most 1 GiB, due to the fixmap living in the next 1 GiB (see 87 * level2_kernel_pgt in arch/x86/kernel/head_64.S). 88 * 89 * On KASLR use 1 GiB by default, leaving 1 GiB for modules once the 90 * page tables are fully set up. 91 * 92 * If KASLR is disabled we can shrink it to 0.5 GiB and increase the size 93 * of the modules area to 1.5 GiB. 94 */ 95 #ifdef CONFIG_RANDOMIZE_BASE 96 #define KERNEL_IMAGE_SIZE (1024 * 1024 * 1024) 97 #else 98 #define KERNEL_IMAGE_SIZE (512 * 1024 * 1024) 99 #endif 100 101 #endif /* _ASM_X86_PAGE_64_DEFS_H */ 102