| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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| 2 | #ifndef _ASM_X86_PAGE_64_DEFS_H |
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| 3 | #define _ASM_X86_PAGE_64_DEFS_H |
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| 4 | |
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| 5 | #ifndef __ASSEMBLER__ |
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| 6 | #include <asm/kaslr.h> |
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| 7 | #endif |
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| 8 | |
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| 9 | #ifdef CONFIG_KASAN |
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| 10 | #define KASAN_STACK_ORDER 1 |
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| 11 | #else |
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| 12 | #define KASAN_STACK_ORDER 0 |
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| 13 | #endif |
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| 14 | |
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| 15 | #define THREAD_SIZE_ORDER (2 + KASAN_STACK_ORDER) |
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| 16 | #define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER) |
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| 17 | |
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| 18 | #define EXCEPTION_STACK_ORDER (1 + KASAN_STACK_ORDER) |
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| 19 | #define EXCEPTION_STKSZ (PAGE_SIZE << EXCEPTION_STACK_ORDER) |
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| 20 | |
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| 21 | #define IRQ_STACK_ORDER (2 + KASAN_STACK_ORDER) |
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| 22 | #define IRQ_STACK_SIZE (PAGE_SIZE << IRQ_STACK_ORDER) |
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| 23 | |
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| 24 | /* |
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| 25 | * The index for the tss.ist[] array. The hardware limit is 7 entries. |
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| 26 | */ |
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| 27 | #define IST_INDEX_DF 0 |
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| 28 | #define IST_INDEX_NMI 1 |
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| 29 | #define IST_INDEX_DB 2 |
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| 30 | #define IST_INDEX_MCE 3 |
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| 31 | #define IST_INDEX_VC 4 |
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| 32 | |
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| 33 | /* |
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| 34 | * Set __PAGE_OFFSET to the most negative possible address + |
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| 35 | * PGDIR_SIZE*17 (pgd slot 273). |
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| 36 | * |
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| 37 | * The gap is to allow a space for LDT remap for PTI (1 pgd slot) and space for |
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| 38 | * a hypervisor (16 slots). Choosing 16 slots for a hypervisor is arbitrary, |
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| 39 | * but it's what Xen requires. |
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| 40 | */ |
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| 41 | #define __PAGE_OFFSET_BASE_L5 _AC(0xff11000000000000, UL) |
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| 42 | #define __PAGE_OFFSET_BASE_L4 _AC(0xffff888000000000, UL) |
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| 43 | |
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| 44 | #define __PAGE_OFFSET page_offset_base |
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| 45 | |
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| 46 | #define __START_KERNEL_map _AC(0xffffffff80000000, UL) |
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| 47 | |
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| 48 | /* See Documentation/arch/x86/x86_64/mm.rst for a description of the memory map. */ |
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| 49 | |
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| 50 | #define __PHYSICAL_MASK_SHIFT 52 |
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| 51 | #define __VIRTUAL_MASK_SHIFT (pgtable_l5_enabled() ? 56 : 47) |
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| 52 | |
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| 53 | #define TASK_SIZE_MAX task_size_max() |
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| 54 | #define DEFAULT_MAP_WINDOW ((1UL << 47) - PAGE_SIZE) |
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| 55 | |
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| 56 | /* This decides where the kernel will search for a free chunk of vm |
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| 57 | * space during mmap's. |
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| 58 | */ |
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| 59 | #define IA32_PAGE_OFFSET ((current->personality & ADDR_LIMIT_3GB) ? \ |
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| 60 | 0xc0000000 : 0xFFFFe000) |
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| 61 | |
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| 62 | #define TASK_SIZE_LOW (test_thread_flag(TIF_ADDR32) ? \ |
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| 63 | IA32_PAGE_OFFSET : DEFAULT_MAP_WINDOW) |
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| 64 | #define TASK_SIZE (test_thread_flag(TIF_ADDR32) ? \ |
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| 65 | IA32_PAGE_OFFSET : TASK_SIZE_MAX) |
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| 66 | #define TASK_SIZE_OF(child) ((test_tsk_thread_flag(child, TIF_ADDR32)) ? \ |
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| 67 | IA32_PAGE_OFFSET : TASK_SIZE_MAX) |
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| 68 | |
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| 69 | #define STACK_TOP TASK_SIZE_LOW |
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| 70 | #define STACK_TOP_MAX TASK_SIZE_MAX |
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| 71 | |
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| 72 | /* |
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| 73 | * In spite of the name, KERNEL_IMAGE_SIZE is a limit on the maximum virtual |
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| 74 | * address for the kernel image, rather than the limit on the size itself. |
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| 75 | * This can be at most 1 GiB, due to the fixmap living in the next 1 GiB (see |
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| 76 | * level2_kernel_pgt in arch/x86/kernel/head_64.S). |
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| 77 | * |
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| 78 | * On KASLR use 1 GiB by default, leaving 1 GiB for modules once the |
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| 79 | * page tables are fully set up. |
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| 80 | * |
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| 81 | * If KASLR is disabled we can shrink it to 0.5 GiB and increase the size |
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| 82 | * of the modules area to 1.5 GiB. |
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| 83 | */ |
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| 84 | #ifdef CONFIG_RANDOMIZE_BASE |
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| 85 | #define KERNEL_IMAGE_SIZE (1024 * 1024 * 1024) |
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| 86 | #else |
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| 87 | #define KERNEL_IMAGE_SIZE (512 * 1024 * 1024) |
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| 88 | #endif |
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| 89 | |
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| 90 | #endif /* _ASM_X86_PAGE_64_DEFS_H */ |
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| 91 | |
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