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"
19 #define STATIC_RW_DATA static __section(.data)
24 #define memmove memmove
25 #define memzero(s, n) memset((s), 0, (n))
27 /* Symbols defined by linker scripts */
29 extern unsigned char _compressed_start[];
30 extern unsigned char _compressed_end[];
32 #ifdef CONFIG_HAVE_KERNEL_BZIP2
33 #define HEAP_SIZE 0x400000
35 #define HEAP_SIZE 0x10000
38 static unsigned long free_mem_ptr = (unsigned long) _end;
39 static unsigned long free_mem_end_ptr = (unsigned long) _end + HEAP_SIZE;
41 #ifdef CONFIG_KERNEL_GZIP
42 #include "../../../../lib/decompress_inflate.c"
45 #ifdef CONFIG_KERNEL_BZIP2
46 #include "../../../../lib/decompress_bunzip2.c"
49 #ifdef CONFIG_KERNEL_LZ4
50 #include "../../../../lib/decompress_unlz4.c"
53 #ifdef CONFIG_KERNEL_LZMA
54 #include "../../../../lib/decompress_unlzma.c"
57 #ifdef CONFIG_KERNEL_LZO
58 #include "../../../../lib/decompress_unlzo.c"
61 #ifdef CONFIG_KERNEL_XZ
62 #include "../../../../lib/decompress_unxz.c"
65 #define decompress_offset ALIGN((unsigned long)_end + 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);