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 */ |
93 | |