Linux kernel mirror (for testing)
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linux
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
15/*
16 * gzip declarations
17 */
18#define STATIC static
19#define STATIC_RW_DATA static __section(.data)
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/* Symbols defined by linker scripts */
28extern char _end[];
29extern unsigned char _compressed_start[];
30extern unsigned char _compressed_end[];
31
32#ifdef CONFIG_HAVE_KERNEL_BZIP2
33#define HEAP_SIZE 0x400000
34#else
35#define HEAP_SIZE 0x10000
36#endif
37
38static unsigned long free_mem_ptr = (unsigned long) _end;
39static unsigned long free_mem_end_ptr = (unsigned long) _end + HEAP_SIZE;
40
41#ifdef CONFIG_KERNEL_GZIP
42#include "../../../../lib/decompress_inflate.c"
43#endif
44
45#ifdef CONFIG_KERNEL_BZIP2
46#include "../../../../lib/decompress_bunzip2.c"
47#endif
48
49#ifdef CONFIG_KERNEL_LZ4
50#include "../../../../lib/decompress_unlz4.c"
51#endif
52
53#ifdef CONFIG_KERNEL_LZMA
54#include "../../../../lib/decompress_unlzma.c"
55#endif
56
57#ifdef CONFIG_KERNEL_LZO
58#include "../../../../lib/decompress_unlzo.c"
59#endif
60
61#ifdef CONFIG_KERNEL_XZ
62#include "../../../../lib/decompress_unxz.c"
63#endif
64
65#define decompress_offset ALIGN((unsigned long)_end + HEAP_SIZE, PAGE_SIZE)
66
67unsigned long mem_safe_offset(void)
68{
69 /*
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
73 */
74 return max(decompress_offset + vmlinux.image_size,
75 vmlinux.default_lma + vmlinux.image_size + vmlinux.bss_size);
76}
77
78void *decompress_kernel(void)
79{
80 void *output = (void *)decompress_offset;
81
82 __decompress(_compressed_start, _compressed_end - _compressed_start,
83 NULL, NULL, output, 0, NULL, error);
84 return output;
85}