| 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 | #ifndef __ASSEMBLY__ |
| 83 | extern unsigned int output_len; |
| 84 | extern const unsigned long kernel_total_size; |
| 85 | |
| 86 | unsigned long decompress_kernel(unsigned char *outbuf, unsigned long virt_addr, |
| 87 | void (*error)(char *x)); |
| 88 | |
| 89 | extern struct boot_params *boot_params_ptr; |
| 90 | #endif |
| 91 | |
| 92 | #endif /* _ASM_X86_BOOT_H */ |