2 * Copyright 2001 MontaVista Software Inc.
3 * Author: Matt Porter <mporter@mvista.com>
5 * Copyright (C) 2009 Lemote, Inc.
6 * Author: Wu Zhangjin <wuzhangjin@gmail.com>
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.
14 #include <linux/types.h>
15 #include <linux/kernel.h>
17 #include <asm/addrspace.h>
20 * These two variables specify the free mem region
21 * that can be used for temporary malloc area
23 unsigned long free_mem_ptr;
24 unsigned long free_mem_end_ptr;
26 /* The linker tells us where the image is. */
27 extern unsigned char __image_begin, __image_end;
29 /* debug interfaces */
30 extern void puts(const char *s);
31 extern void puthex(unsigned long long val);
37 puts("\n\n -- System halted");
43 /* activate the code for pre-boot environment */
46 #ifdef CONFIG_KERNEL_GZIP
47 #include "../../../../lib/decompress_inflate.c"
50 #ifdef CONFIG_KERNEL_BZIP2
51 #include "../../../../lib/decompress_bunzip2.c"
54 #ifdef CONFIG_KERNEL_LZ4
55 #include "../../../../lib/decompress_unlz4.c"
58 #ifdef CONFIG_KERNEL_LZMA
59 #include "../../../../lib/decompress_unlzma.c"
62 #ifdef CONFIG_KERNEL_LZO
63 #include "../../../../lib/decompress_unlzo.c"
66 #ifdef CONFIG_KERNEL_XZ
67 #include "../../../../lib/decompress_unxz.c"
70 unsigned long __stack_chk_guard;
72 void __stack_chk_guard_setup(void)
74 __stack_chk_guard = 0x000a0dff;
77 void __stack_chk_fail(void)
79 error("stack-protector: Kernel stack is corrupted\n");
82 void decompress_kernel(unsigned long boot_heap_start)
84 unsigned long zimage_start, zimage_size;
86 __stack_chk_guard_setup();
88 zimage_start = (unsigned long)(&__image_begin);
89 zimage_size = (unsigned long)(&__image_end) -
90 (unsigned long)(&__image_begin);
95 puthex(zimage_size + zimage_start);
98 /* This area are prepared for mallocing when decompressing */
99 free_mem_ptr = boot_heap_start;
100 free_mem_end_ptr = boot_heap_start + BOOT_HEAP_SIZE;
102 /* Display standard Linux/MIPS boot prompt */
103 puts("Uncompressing Linux at load address ");
104 puthex(VMLINUX_LOAD_ADDRESS_ULL);
107 /* Decompress the kernel with according algorithm */
108 decompress((char *)zimage_start, zimage_size, 0, 0,
109 (void *)VMLINUX_LOAD_ADDRESS_ULL, 0, error);
111 /* FIXME: should we flush cache here? */
112 puts("Now, booting the kernel...\n");