| 1 |
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| 2 | #ifndef _ASM_X86_BOOT_H
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| 3 | #define _ASM_X86_BOOT_H
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| 4 |
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| 5 |
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| 6 | #include <asm/pgtable_types.h>
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| 7 | #include <uapi/asm/boot.h>
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| 8 |
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| 9 |
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| 10 | #ifdef CONFIG_X86_64
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| 11 | # define MIN_KERNEL_ALIGN_LG2 PMD_SHIFT
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| 12 | #else
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| 13 | # define MIN_KERNEL_ALIGN_LG2 (PAGE_SHIFT + THREAD_SIZE_ORDER)
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| 14 | #endif
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| 15 | #define MIN_KERNEL_ALIGN (_AC(1, UL) << MIN_KERNEL_ALIGN_LG2)
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| 16 |
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| 17 | #if (CONFIG_PHYSICAL_ALIGN & (CONFIG_PHYSICAL_ALIGN-1)) || \
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| 18 | (CONFIG_PHYSICAL_ALIGN < MIN_KERNEL_ALIGN)
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| 19 | # error "Invalid value for CONFIG_PHYSICAL_ALIGN"
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| 20 | #endif
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| 21 |
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| 22 | #if defined(CONFIG_KERNEL_BZIP2)
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| 23 | # define BOOT_HEAP_SIZE 0x400000
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| 24 | #elif defined(CONFIG_KERNEL_ZSTD)
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| 25 | |
| 26 | * Zstd needs to allocate the ZSTD_DCtx in order to decompress the kernel.
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| 27 | * The ZSTD_DCtx is ~160KB, so set the heap size to 192KB because it is a
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| 28 | * round number and to allow some slack.
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| 29 |
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| 30 | # define BOOT_HEAP_SIZE 0x30000
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| 31 | #else
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| 32 | # define BOOT_HEAP_SIZE 0x10000
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| 33 | #endif
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| 34 |
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| 35 | #ifdef CONFIG_X86_64
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| 36 | # define BOOT_STACK_SIZE 0x4000
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| 37 |
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| 38 | |
| 39 | * Used by decompressor's startup_32() to allocate page tables for identity
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| 40 | * mapping of the 4G of RAM in 4-level paging mode:
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| 41 | * - 1 level4 table;
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| 42 | * - 1 level3 table;
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| 43 | * - 4 level2 table that maps everything with 2M pages;
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| 44 | *
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| 45 | * The additional level5 table needed for 5-level paging is allocated from
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| 46 | * trampoline_32bit memory.
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| 47 |
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| 48 | # define BOOT_INIT_PGT_SIZE (6*4096)
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| 49 |
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| 50 | |
| 51 | * Total number of page tables kernel_add_identity_map() can allocate,
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| 52 | * including page tables consumed by startup_32().
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| 53 | *
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| 54 | * Worst-case scenario:
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| 55 | * - 5-level paging needs 1 level5 table;
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| 56 | * - KASLR needs to map kernel, boot_params, cmdline and randomized kernel,
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| 57 | * assuming all of them cross 256T boundary:
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| 58 | * + 4*2 level4 table;
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| 59 | * + 4*2 level3 table;
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| 60 | * + 4*2 level2 table;
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| 61 | * - X86_VERBOSE_BOOTUP needs to map the first 2M (video RAM):
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| 62 | * + 1 level4 table;
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| 63 | * + 1 level3 table;
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| 64 | * + 1 level2 table;
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| 65 | * Total: 28 tables
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| 66 | *
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| 67 | * Add 4 spare table in case decompressor touches anything beyond what is
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| 68 | * accounted above. Warn if it happens.
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| 69 |
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| 70 | # define BOOT_PGT_SIZE_WARN (28*4096)
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| 71 | # define BOOT_PGT_SIZE (32*4096)
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| 72 |
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| 73 | #else
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| 74 | # define BOOT_STACK_SIZE 0x1000
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| 75 | #endif
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| 76 |
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| 77 | #define TRAMPOLINE_32BIT_SIZE (2 * PAGE_SIZE)
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| 78 |
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| 79 | #define TRAMPOLINE_32BIT_CODE_OFFSET PAGE_SIZE
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| 80 | #define TRAMPOLINE_32BIT_CODE_SIZE 0xA0
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| 81 |
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| 82 | #ifndef __ASSEMBLER__
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| 83 | extern unsigned int output_len;
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| 84 | extern const unsigned long kernel_text_size;
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| 85 | extern const unsigned long kernel_inittext_offset;
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| 86 | extern const unsigned long kernel_inittext_size;
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| 87 | extern const unsigned long kernel_total_size;
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| 88 |
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| 89 | unsigned long decompress_kernel(unsigned char *outbuf, unsigned long virt_addr,
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| 90 | void (*error)(char *x));
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| 91 |
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| 92 | extern struct boot_params *boot_params_ptr;
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| 93 | extern unsigned long *trampoline_32bit;
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| 94 | extern const u16 trampoline_ljmp_imm_offset;
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| 95 |
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| 96 | void trampoline_32bit_src(void *trampoline, bool enable_5lvl);
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| 97 |
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| 98 | #endif
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| 99 |
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| 100 | #endif
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