1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASM_X86_BOOT_H 3 #define _ASM_X86_BOOT_H 4 5 6 #include <asm/pgtable_types.h> 7 #include <uapi/asm/boot.h> 8 9 /* Physical address where kernel should be loaded. */ 10 #define LOAD_PHYSICAL_ADDR ((CONFIG_PHYSICAL_START \ 11 + (CONFIG_PHYSICAL_ALIGN - 1)) \ 12 & ~(CONFIG_PHYSICAL_ALIGN - 1)) 13 14 /* Minimum kernel alignment, as a power of two */ 15 #ifdef CONFIG_X86_64 16 # define MIN_KERNEL_ALIGN_LG2 PMD_SHIFT 17 #else 18 # define MIN_KERNEL_ALIGN_LG2 (PAGE_SHIFT + THREAD_SIZE_ORDER) 19 #endif 20 #define MIN_KERNEL_ALIGN (_AC(1, UL) << MIN_KERNEL_ALIGN_LG2) 21 22 #if (CONFIG_PHYSICAL_ALIGN & (CONFIG_PHYSICAL_ALIGN-1)) || \ 23 (CONFIG_PHYSICAL_ALIGN < MIN_KERNEL_ALIGN) 24 # error "Invalid value for CONFIG_PHYSICAL_ALIGN" 25 #endif 26 27 #if defined(CONFIG_KERNEL_BZIP2) 28 # define BOOT_HEAP_SIZE 0x400000 29 #elif defined(CONFIG_KERNEL_ZSTD) 30 /* 31 * Zstd needs to allocate the ZSTD_DCtx in order to decompress the kernel. 32 * The ZSTD_DCtx is ~160KB, so set the heap size to 192KB because it is a 33 * round number and to allow some slack. 34 */ 35 # define BOOT_HEAP_SIZE 0x30000 36 #else 37 # define BOOT_HEAP_SIZE 0x10000 38 #endif 39 40 #ifdef CONFIG_X86_64 41 # define BOOT_STACK_SIZE 0x4000 42 43 /* 44 * Used by decompressor's startup_32() to allocate page tables for identity 45 * mapping of the 4G of RAM in 4-level paging mode: 46 * - 1 level4 table; 47 * - 1 level3 table; 48 * - 4 level2 table that maps everything with 2M pages; 49 * 50 * The additional level5 table needed for 5-level paging is allocated from 51 * trampoline_32bit memory. 52 */ 53 # define BOOT_INIT_PGT_SIZE (6*4096) 54 55 /* 56 * Total number of page tables kernel_add_identity_map() can allocate, 57 * including page tables consumed by startup_32(). 58 * 59 * Worst-case scenario: 60 * - 5-level paging needs 1 level5 table; 61 * - KASLR needs to map kernel, boot_params, cmdline and randomized kernel, 62 * assuming all of them cross 256T boundary: 63 * + 4*2 level4 table; 64 * + 4*2 level3 table; 65 * + 4*2 level2 table; 66 * - X86_VERBOSE_BOOTUP needs to map the first 2M (video RAM): 67 * + 1 level4 table; 68 * + 1 level3 table; 69 * + 1 level2 table; 70 * Total: 28 tables 71 * 72 * Add 4 spare table in case decompressor touches anything beyond what is 73 * accounted above. Warn if it happens. 74 */ 75 # define BOOT_PGT_SIZE_WARN (28*4096) 76 # define BOOT_PGT_SIZE (32*4096) 77 78 #else /* !CONFIG_X86_64 */ 79 # define BOOT_STACK_SIZE 0x1000 80 #endif 81 82 #endif /* _ASM_X86_BOOT_H */ 83