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1b93b3c3 WZ |
1 | /* |
2 | * Misc. bootloader code for many machines. | |
3 | * | |
4 | * Copyright 2001 MontaVista Software Inc. | |
5 | * Author: Matt Porter <mporter@mvista.com> Derived from | |
6 | * arch/ppc/boot/prep/misc.c | |
7 | * | |
8 | * Copyright (C) 2009 Lemote, Inc. & Institute of Computing Technology | |
9 | * Author: Wu Zhangjin <wuzj@lemote.com> | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify it | |
12 | * under the terms of the GNU General Public License as published by the | |
13 | * Free Software Foundation; either version 2 of the License, or (at your | |
14 | * option) any later version. | |
15 | */ | |
16 | ||
17 | #include <linux/types.h> | |
18 | #include <linux/kernel.h> | |
19 | ||
20 | #include <asm/addrspace.h> | |
21 | ||
22 | /* These two variables specify the free mem region | |
23 | * that can be used for temporary malloc area | |
24 | */ | |
25 | unsigned long free_mem_ptr; | |
26 | unsigned long free_mem_end_ptr; | |
27 | char *zimage_start; | |
28 | ||
29 | /* The linker tells us where the image is. */ | |
30 | extern unsigned char __image_begin, __image_end; | |
1b93b3c3 WZ |
31 | |
32 | /* debug interfaces */ | |
33 | extern void puts(const char *s); | |
34 | extern void puthex(unsigned long long val); | |
35 | ||
36 | void error(char *x) | |
37 | { | |
38 | puts("\n\n"); | |
39 | puts(x); | |
40 | puts("\n\n -- System halted"); | |
41 | ||
42 | while (1) | |
43 | ; /* Halt */ | |
44 | } | |
45 | ||
46 | /* activate the code for pre-boot environment */ | |
47 | #define STATIC static | |
48 | ||
49 | #ifdef CONFIG_KERNEL_GZIP | |
50 | void *memcpy(void *dest, const void *src, size_t n) | |
51 | { | |
52 | int i; | |
53 | const char *s = src; | |
54 | char *d = dest; | |
55 | ||
56 | for (i = 0; i < n; i++) | |
57 | d[i] = s[i]; | |
58 | return dest; | |
59 | } | |
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_LZMA | |
77 | #include "../../../../lib/decompress_unlzma.c" | |
78 | #endif | |
79 | ||
fe1d45e0 WZ |
80 | #ifdef CONFIG_KERNEL_LZO |
81 | #include "../../../../lib/decompress_unlzo.c" | |
82 | #endif | |
83 | ||
1b93b3c3 WZ |
84 | void decompress_kernel(unsigned long boot_heap_start) |
85 | { | |
86 | int zimage_size; | |
87 | ||
88 | /* | |
89 | * We link ourself to an arbitrary low address. When we run, we | |
90 | * relocate outself to that address. __image_beign points to | |
91 | * the part of the image where the zImage is. -- Tom | |
92 | */ | |
93 | zimage_start = (char *)(unsigned long)(&__image_begin); | |
94 | zimage_size = (unsigned long)(&__image_end) - | |
95 | (unsigned long)(&__image_begin); | |
96 | ||
97 | /* | |
98 | * The zImage and initrd will be between start and _end, so they've | |
99 | * already been moved once. We're good to go now. -- Tom | |
100 | */ | |
101 | puts("zimage at: "); | |
102 | puthex((unsigned long)zimage_start); | |
103 | puts(" "); | |
104 | puthex((unsigned long)(zimage_size + zimage_start)); | |
105 | puts("\n"); | |
106 | ||
1b93b3c3 WZ |
107 | /* this area are prepared for mallocing when decompressing */ |
108 | free_mem_ptr = boot_heap_start; | |
109 | free_mem_end_ptr = boot_heap_start + BOOT_HEAP_SIZE; | |
110 | ||
111 | /* Display standard Linux/MIPS boot prompt for kernel args */ | |
112 | puts("Uncompressing Linux at load address "); | |
113 | puthex(VMLINUX_LOAD_ADDRESS_ULL); | |
114 | puts("\n"); | |
115 | /* Decompress the kernel with according algorithm */ | |
116 | decompress(zimage_start, zimage_size, 0, 0, | |
117 | (void *)VMLINUX_LOAD_ADDRESS_ULL, 0, error); | |
118 | /* FIXME: is there a need to flush cache here? */ | |
119 | puts("Now, booting the kernel...\n"); | |
120 | } |