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 /* Minimum kernel alignment, as a power of two */ 10 #ifdef CONFIG_X86_64 11 # define MIN_KERNEL_ALIGN_LG2 PMD_SHIFT 12 #else 13 # define MIN_KERNEL_ALIGN_LG2 (PAGE_SHIFT + THREAD_SIZE_ORDER) 14 #endif 15 #define MIN_KERNEL_ALIGN (_AC(1, UL) << MIN_KERNEL_ALIGN_LG2) 16 17 #if (CONFIG_PHYSICAL_ALIGN & (CONFIG_PHYSICAL_ALIGN-1)) || \ 18 (CONFIG_PHYSICAL_ALIGN < MIN_KERNEL_ALIGN) 19 # error "Invalid value for CONFIG_PHYSICAL_ALIGN" 20 #endif 21 22 #if defined(CONFIG_KERNEL_BZIP2) 23 # define BOOT_HEAP_SIZE 0x400000 24 #elif defined(CONFIG_KERNEL_ZSTD) 25 /* 26 * Zstd needs to allocate the ZSTD_DCtx in order to decompress the kernel. 27 * The ZSTD_DCtx is ~160KB, so set the heap size to 192KB because it is a 28 * round number and to allow some slack. 29 */ 30 # define BOOT_HEAP_SIZE 0x30000 31 #else 32 # define BOOT_HEAP_SIZE 0x10000 33 #endif 34 35 #ifdef CONFIG_X86_64 36 # define BOOT_STACK_SIZE 0x4000 37 38 /* 39 * Used by decompressor's startup_32() to allocate page tables for identity 40 * mapping of the 4G of RAM in 4-level paging mode: 41 * - 1 level4 table; 42 * - 1 level3 table; 43 * - 4 level2 table that maps everything with 2M pages; 44 * 45 * The additional level5 table needed for 5-level paging is allocated from 46 * trampoline_32bit memory. 47 */ 48 # define BOOT_INIT_PGT_SIZE (6*4096) 49 50 /* 51 * Total number of page tables kernel_add_identity_map() can allocate, 52 * including page tables consumed by startup_32(). 53 * 54 * Worst-case scenario: 55 * - 5-level paging needs 1 level5 table; 56 * - KASLR needs to map kernel, boot_params, cmdline and randomized kernel, 57 * assuming all of them cross 256T boundary: 58 * + 4*2 level4 table; 59 * + 4*2 level3 table; 60 * + 4*2 level2 table; 61 * - X86_VERBOSE_BOOTUP needs to map the first 2M (video RAM): 62 * + 1 level4 table; 63 * + 1 level3 table; 64 * + 1 level2 table; 65 * Total: 28 tables 66 * 67 * Add 4 spare table in case decompressor touches anything beyond what is 68 * accounted above. Warn if it happens. 69 */ 70 # define BOOT_PGT_SIZE_WARN (28*4096) 71 # define BOOT_PGT_SIZE (32*4096) 72 73 #else /* !CONFIG_X86_64 */ 74 # define BOOT_STACK_SIZE 0x1000 75 #endif 76 77 #ifndef __ASSEMBLY__ 78 extern unsigned int output_len; 79 extern const unsigned long kernel_text_size; 80 extern const unsigned long kernel_total_size; 81 82 unsigned long decompress_kernel(unsigned char *outbuf, unsigned long virt_addr, 83 void (*error)(char *x)); 84 85 extern struct boot_params *boot_params_ptr; 86 #endif 87 88 #endif /* _ASM_X86_BOOT_H */ 89
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