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
error(char * x)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 #ifdef CONFIG_KERNEL_GZIP
memcpy(void * dest,const void * src,size_t n)47 void *memcpy(void *dest, const void *src, size_t n)
48 {
49 int i;
50 const char *s = src;
51 char *d = dest;
52
53 for (i = 0; i < n; i++)
54 d[i] = s[i];
55 return dest;
56 }
57 #include "../../../../lib/decompress_inflate.c"
58 #endif
59
60 #ifdef CONFIG_KERNEL_BZIP2
memset(void * s,int c,size_t n)61 void *memset(void *s, int c, size_t n)
62 {
63 int i;
64 char *ss = s;
65
66 for (i = 0; i < n; i++)
67 ss[i] = c;
68 return s;
69 }
70 #include "../../../../lib/decompress_bunzip2.c"
71 #endif
72
73 #ifdef CONFIG_KERNEL_LZMA
74 #include "../../../../lib/decompress_unlzma.c"
75 #endif
76
77 #ifdef CONFIG_KERNEL_LZO
78 #include "../../../../lib/decompress_unlzo.c"
79 #endif
80
decompress_kernel(unsigned long boot_heap_start)81 void decompress_kernel(unsigned long boot_heap_start)
82 {
83 unsigned long zimage_start, zimage_size;
84
85 zimage_start = (unsigned long)(&__image_begin);
86 zimage_size = (unsigned long)(&__image_end) -
87 (unsigned long)(&__image_begin);
88
89 puts("zimage at: ");
90 puthex(zimage_start);
91 puts(" ");
92 puthex(zimage_size + zimage_start);
93 puts("\n");
94
95 /* This area are prepared for mallocing when decompressing */
96 free_mem_ptr = boot_heap_start;
97 free_mem_end_ptr = boot_heap_start + BOOT_HEAP_SIZE;
98
99 /* Display standard Linux/MIPS boot prompt */
100 puts("Uncompressing Linux at load address ");
101 puthex(VMLINUX_LOAD_ADDRESS_ULL);
102 puts("\n");
103
104 /* Decompress the kernel with according algorithm */
105 decompress((char *)zimage_start, zimage_size, 0, 0,
106 (void *)VMLINUX_LOAD_ADDRESS_ULL, 0, error);
107
108 /* FIXME: should we flush cache here? */
109 puts("Now, booting the kernel...\n");
110 }
111