1 // SPDX-License-Identifier: GPL-2.0
3 * Definitions and wrapper functions for kernel decompressor
5 * Copyright IBM Corp. 2010
7 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
10 #include <linux/kernel.h>
11 #include <linux/string.h>
13 #include "decompressor.h"
23 #define memmove memmove
24 #define memzero(s, n) memset((s), 0, (n))
26 #if defined(CONFIG_KERNEL_BZIP2)
27 #define BOOT_HEAP_SIZE 0x400000
28 #elif defined(CONFIG_KERNEL_ZSTD)
29 #define BOOT_HEAP_SIZE 0x30000
31 #define BOOT_HEAP_SIZE 0x10000
34 static unsigned long free_mem_ptr = (unsigned long) _end;
35 static unsigned long free_mem_end_ptr = (unsigned long) _end + BOOT_HEAP_SIZE;
37 #ifdef CONFIG_KERNEL_GZIP
38 #include "../../../../lib/decompress_inflate.c"
41 #ifdef CONFIG_KERNEL_BZIP2
42 #include "../../../../lib/decompress_bunzip2.c"
45 #ifdef CONFIG_KERNEL_LZ4
46 #include "../../../../lib/decompress_unlz4.c"
49 #ifdef CONFIG_KERNEL_LZMA
50 #include "../../../../lib/decompress_unlzma.c"
53 #ifdef CONFIG_KERNEL_LZO
54 #include "../../../../lib/decompress_unlzo.c"
57 #ifdef CONFIG_KERNEL_XZ
58 #include "../../../../lib/decompress_unxz.c"
61 #ifdef CONFIG_KERNEL_ZSTD
62 #include "../../../../lib/decompress_unzstd.c"
65 #define decompress_offset ALIGN((unsigned long)_end + BOOT_HEAP_SIZE, PAGE_SIZE)
67 unsigned long mem_safe_offset(void)
70 * due to 4MB HEAD_SIZE for bzip2
71 * 'decompress_offset + vmlinux.image_size' could be larger than
72 * kernel at final position + its .bss, so take the larger of two
74 return max(decompress_offset + vmlinux.image_size,
75 vmlinux.default_lma + vmlinux.image_size + vmlinux.bss_size);
78 void *decompress_kernel(void)
80 void *output = (void *)decompress_offset;
82 __decompress(_compressed_start, _compressed_end - _compressed_start,
83 NULL, NULL, output, vmlinux.image_size, NULL, error);