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Wu Zhangjin1b93b3c2009-10-14 18:12:16 +08001/*
Wu Zhangjin1b93b3c2009-10-14 18:12:16 +08002 * Copyright 2001 MontaVista Software Inc.
Wu Zhangjin1e1a77d2010-06-16 15:52:20 +08003 * Author: Matt Porter <mporter@mvista.com>
Wu Zhangjin1b93b3c2009-10-14 18:12:16 +08004 *
Wu Zhangjinf7a904d2010-01-04 17:16:51 +08005 * Copyright (C) 2009 Lemote, Inc.
6 * Author: Wu Zhangjin <wuzhangjin@gmail.com>
Wu Zhangjin1b93b3c2009-10-14 18:12:16 +08007 *
Ralf Baechle70342282013-01-22 12:59:30 +01008 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
Wu Zhangjin1b93b3c2009-10-14 18:12:16 +080010 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
12 */
13
14#include <linux/types.h>
15#include <linux/kernel.h>
16
17#include <asm/addrspace.h>
18
Wu Zhangjin1e1a77d2010-06-16 15:52:20 +080019/*
20 * These two variables specify the free mem region
Wu Zhangjin1b93b3c2009-10-14 18:12:16 +080021 * that can be used for temporary malloc area
22 */
23unsigned long free_mem_ptr;
24unsigned long free_mem_end_ptr;
Wu Zhangjin1b93b3c2009-10-14 18:12:16 +080025
26/* The linker tells us where the image is. */
27extern unsigned char __image_begin, __image_end;
Wu Zhangjin1b93b3c2009-10-14 18:12:16 +080028
29/* debug interfaces */
30extern void puts(const char *s);
31extern void puthex(unsigned long long val);
32
33void error(char *x)
34{
35 puts("\n\n");
36 puts(x);
37 puts("\n\n -- System halted");
38
39 while (1)
40 ; /* Halt */
41}
42
43/* activate the code for pre-boot environment */
44#define STATIC static
45
Florian Fainelli31c48672013-09-16 16:55:20 +010046#if defined(CONFIG_KERNEL_GZIP) || defined(CONFIG_KERNEL_XZ) || \
47 defined(CONFIG_KERNEL_LZ4)
Wu Zhangjin1b93b3c2009-10-14 18:12:16 +080048void *memcpy(void *dest, const void *src, size_t n)
49{
50 int i;
51 const char *s = src;
52 char *d = dest;
53
54 for (i = 0; i < n; i++)
55 d[i] = s[i];
56 return dest;
57}
Florian Fainelli4e23eb62013-09-11 11:51:41 +010058#endif
59#ifdef CONFIG_KERNEL_GZIP
Wu Zhangjin1b93b3c2009-10-14 18:12:16 +080060#include "../../../../lib/decompress_inflate.c"
61#endif
62
63#ifdef CONFIG_KERNEL_BZIP2
64void *memset(void *s, int c, size_t n)
65{
66 int i;
67 char *ss = s;
68
69 for (i = 0; i < n; i++)
70 ss[i] = c;
71 return s;
72}
73#include "../../../../lib/decompress_bunzip2.c"
74#endif
75
Florian Fainelli31c48672013-09-16 16:55:20 +010076#ifdef CONFIG_KERNEL_LZ4
77#include "../../../../lib/decompress_unlz4.c"
78#endif
79
Wu Zhangjin1b93b3c2009-10-14 18:12:16 +080080#ifdef CONFIG_KERNEL_LZMA
81#include "../../../../lib/decompress_unlzma.c"
82#endif
83
Wu Zhangjinfe1d45e2010-01-15 20:34:46 +080084#ifdef CONFIG_KERNEL_LZO
85#include "../../../../lib/decompress_unlzo.c"
86#endif
87
Florian Fainelli4e23eb62013-09-11 11:51:41 +010088#ifdef CONFIG_KERNEL_XZ
89#include "../../../../lib/decompress_unxz.c"
90#endif
91
Wu Zhangjin1b93b3c2009-10-14 18:12:16 +080092void decompress_kernel(unsigned long boot_heap_start)
93{
Wu Zhangjin1e1a77d2010-06-16 15:52:20 +080094 unsigned long zimage_start, zimage_size;
Wu Zhangjin1b93b3c2009-10-14 18:12:16 +080095
Wu Zhangjin1e1a77d2010-06-16 15:52:20 +080096 zimage_start = (unsigned long)(&__image_begin);
Wu Zhangjin1b93b3c2009-10-14 18:12:16 +080097 zimage_size = (unsigned long)(&__image_end) -
98 (unsigned long)(&__image_begin);
99
Wu Zhangjin1b93b3c2009-10-14 18:12:16 +0800100 puts("zimage at: ");
Wu Zhangjin1e1a77d2010-06-16 15:52:20 +0800101 puthex(zimage_start);
Wu Zhangjin1b93b3c2009-10-14 18:12:16 +0800102 puts(" ");
Wu Zhangjin1e1a77d2010-06-16 15:52:20 +0800103 puthex(zimage_size + zimage_start);
Wu Zhangjin1b93b3c2009-10-14 18:12:16 +0800104 puts("\n");
105
Wu Zhangjin1e1a77d2010-06-16 15:52:20 +0800106 /* This area are prepared for mallocing when decompressing */
Wu Zhangjin1b93b3c2009-10-14 18:12:16 +0800107 free_mem_ptr = boot_heap_start;
108 free_mem_end_ptr = boot_heap_start + BOOT_HEAP_SIZE;
109
Wu Zhangjin1e1a77d2010-06-16 15:52:20 +0800110 /* Display standard Linux/MIPS boot prompt */
Wu Zhangjin1b93b3c2009-10-14 18:12:16 +0800111 puts("Uncompressing Linux at load address ");
112 puthex(VMLINUX_LOAD_ADDRESS_ULL);
113 puts("\n");
Wu Zhangjin1e1a77d2010-06-16 15:52:20 +0800114
Wu Zhangjin1b93b3c2009-10-14 18:12:16 +0800115 /* Decompress the kernel with according algorithm */
Wu Zhangjin1e1a77d2010-06-16 15:52:20 +0800116 decompress((char *)zimage_start, zimage_size, 0, 0,
Wu Zhangjin1b93b3c2009-10-14 18:12:16 +0800117 (void *)VMLINUX_LOAD_ADDRESS_ULL, 0, error);
Wu Zhangjin1e1a77d2010-06-16 15:52:20 +0800118
119 /* FIXME: should we flush cache here? */
Wu Zhangjin1b93b3c2009-10-14 18:12:16 +0800120 puts("Now, booting the kernel...\n");
121}