| 1 | // SPDX-License-Identifier: GPL-2.0 |
|---|
| 2 | /* |
|---|
| 3 | * Definitions and wrapper functions for kernel decompressor |
|---|
| 4 | * |
|---|
| 5 | * Copyright IBM Corp. 2010 |
|---|
| 6 | * |
|---|
| 7 | * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com> |
|---|
| 8 | */ |
|---|
| 9 | |
|---|
| 10 | #include <linux/kernel.h> |
|---|
| 11 | #include <linux/string.h> |
|---|
| 12 | #include <asm/page.h> |
|---|
| 13 | #include "decompressor.h" |
|---|
| 14 | #include "boot.h" |
|---|
| 15 | |
|---|
| 16 | /* |
|---|
| 17 | * gzip declarations |
|---|
| 18 | */ |
|---|
| 19 | #define STATIC static |
|---|
| 20 | |
|---|
| 21 | #undef memset |
|---|
| 22 | #undef memcpy |
|---|
| 23 | #undef memmove |
|---|
| 24 | #define memmove memmove |
|---|
| 25 | #define memzero(s, n) memset((s), 0, (n)) |
|---|
| 26 | |
|---|
| 27 | #if defined(CONFIG_KERNEL_BZIP2) |
|---|
| 28 | #define BOOT_HEAP_SIZE 0x400000 |
|---|
| 29 | #elif defined(CONFIG_KERNEL_ZSTD) |
|---|
| 30 | #define BOOT_HEAP_SIZE 0x30000 |
|---|
| 31 | #else |
|---|
| 32 | #define BOOT_HEAP_SIZE 0x10000 |
|---|
| 33 | #endif |
|---|
| 34 | |
|---|
| 35 | static unsigned long free_mem_ptr = (unsigned long) _end; |
|---|
| 36 | static unsigned long free_mem_end_ptr = (unsigned long) _end + BOOT_HEAP_SIZE; |
|---|
| 37 | |
|---|
| 38 | #ifdef CONFIG_KERNEL_GZIP |
|---|
| 39 | #include "../../../../lib/decompress_inflate.c" |
|---|
| 40 | #endif |
|---|
| 41 | |
|---|
| 42 | #ifdef CONFIG_KERNEL_BZIP2 |
|---|
| 43 | #include "../../../../lib/decompress_bunzip2.c" |
|---|
| 44 | #endif |
|---|
| 45 | |
|---|
| 46 | #ifdef CONFIG_KERNEL_LZ4 |
|---|
| 47 | #include "../../../../lib/decompress_unlz4.c" |
|---|
| 48 | #endif |
|---|
| 49 | |
|---|
| 50 | #ifdef CONFIG_KERNEL_LZMA |
|---|
| 51 | #include "../../../../lib/decompress_unlzma.c" |
|---|
| 52 | #endif |
|---|
| 53 | |
|---|
| 54 | #ifdef CONFIG_KERNEL_LZO |
|---|
| 55 | #include "../../../../lib/decompress_unlzo.c" |
|---|
| 56 | #endif |
|---|
| 57 | |
|---|
| 58 | #ifdef CONFIG_KERNEL_XZ |
|---|
| 59 | #include "../../../../lib/decompress_unxz.c" |
|---|
| 60 | #endif |
|---|
| 61 | |
|---|
| 62 | #ifdef CONFIG_KERNEL_ZSTD |
|---|
| 63 | #include "../../../../lib/decompress_unzstd.c" |
|---|
| 64 | #endif |
|---|
| 65 | |
|---|
| 66 | #define decompress_offset ALIGN((unsigned long)_end + BOOT_HEAP_SIZE, PAGE_SIZE) |
|---|
| 67 | |
|---|
| 68 | unsigned long mem_safe_offset(void) |
|---|
| 69 | { |
|---|
| 70 | /* |
|---|
| 71 | * due to 4MB HEAD_SIZE for bzip2 |
|---|
| 72 | * 'decompress_offset + vmlinux.image_size' could be larger than |
|---|
| 73 | * kernel at final position + its .bss, so take the larger of two |
|---|
| 74 | */ |
|---|
| 75 | return max(decompress_offset + vmlinux.image_size, |
|---|
| 76 | vmlinux.default_lma + vmlinux.image_size + vmlinux.bss_size); |
|---|
| 77 | } |
|---|
| 78 | |
|---|
| 79 | void *decompress_kernel(void) |
|---|
| 80 | { |
|---|
| 81 | void *output = (void *)decompress_offset; |
|---|
| 82 | |
|---|
| 83 | __decompress(buf: _compressed_start, len: _compressed_end - _compressed_start, |
|---|
| 84 | NULL, NULL, out_buf: output, vmlinux.image_size, NULL, error); |
|---|
| 85 | return output; |
|---|
| 86 | } |
|---|
| 87 | |
|---|
