Merge branch 'for-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/bluetoot...
[linux-drm-fsl-dcu.git] / arch / mips / boot / compressed / decompress.c
1 /*
2  * Copyright 2001 MontaVista Software Inc.
3  * Author: Matt Porter <mporter@mvista.com>
4  *
5  * Copyright (C) 2009 Lemote, Inc.
6  * Author: Wu Zhangjin <wuzhangjin@gmail.com>
7  *
8  * 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
10  * 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
19 /*
20  * These two variables specify the free mem region
21  * that can be used for temporary malloc area
22  */
23 unsigned long free_mem_ptr;
24 unsigned long free_mem_end_ptr;
25
26 /* The linker tells us where the image is. */
27 extern unsigned char __image_begin, __image_end;
28
29 /* debug interfaces  */
30 extern void puts(const char *s);
31 extern void puthex(unsigned long long val);
32
33 void 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
46 #if defined(CONFIG_KERNEL_GZIP) || defined(CONFIG_KERNEL_XZ) || \
47         defined(CONFIG_KERNEL_LZ4)
48 void *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 }
58 #endif
59 #ifdef CONFIG_KERNEL_GZIP
60 #include "../../../../lib/decompress_inflate.c"
61 #endif
62
63 #ifdef CONFIG_KERNEL_BZIP2
64 void *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
76 #ifdef CONFIG_KERNEL_LZ4
77 #include "../../../../lib/decompress_unlz4.c"
78 #endif
79
80 #ifdef CONFIG_KERNEL_LZMA
81 #include "../../../../lib/decompress_unlzma.c"
82 #endif
83
84 #ifdef CONFIG_KERNEL_LZO
85 #include "../../../../lib/decompress_unlzo.c"
86 #endif
87
88 #ifdef CONFIG_KERNEL_XZ
89 #include "../../../../lib/decompress_unxz.c"
90 #endif
91
92 void decompress_kernel(unsigned long boot_heap_start)
93 {
94         unsigned long zimage_start, zimage_size;
95
96         zimage_start = (unsigned long)(&__image_begin);
97         zimage_size = (unsigned long)(&__image_end) -
98             (unsigned long)(&__image_begin);
99
100         puts("zimage at:     ");
101         puthex(zimage_start);
102         puts(" ");
103         puthex(zimage_size + zimage_start);
104         puts("\n");
105
106         /* This area are prepared for mallocing when decompressing */
107         free_mem_ptr = boot_heap_start;
108         free_mem_end_ptr = boot_heap_start + BOOT_HEAP_SIZE;
109
110         /* Display standard Linux/MIPS boot prompt */
111         puts("Uncompressing Linux at load address ");
112         puthex(VMLINUX_LOAD_ADDRESS_ULL);
113         puts("\n");
114
115         /* Decompress the kernel with according algorithm */
116         decompress((char *)zimage_start, zimage_size, 0, 0,
117                    (void *)VMLINUX_LOAD_ADDRESS_ULL, 0, error);
118
119         /* FIXME: should we flush cache here? */
120         puts("Now, booting the kernel...\n");
121 }