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>
16 #include <linux/string.h>
18 #include <asm/addrspace.h>
21 * These two variables specify the free mem region
22 * that can be used for temporary malloc area
24 unsigned long free_mem_ptr;
25 unsigned long free_mem_end_ptr;
27 /* The linker tells us where the image is. */
28 extern unsigned char __image_begin, __image_end;
30 /* debug interfaces */
31 extern void puts(const char *s);
32 extern void puthex(unsigned long long val);
38 puts("\n\n -- System halted");
44 /* activate the code for pre-boot environment */
47 #ifdef CONFIG_KERNEL_GZIP
48 #include "../../../../lib/decompress_inflate.c"
51 #ifdef CONFIG_KERNEL_BZIP2
52 #include "../../../../lib/decompress_bunzip2.c"
55 #ifdef CONFIG_KERNEL_LZ4
56 #include "../../../../lib/decompress_unlz4.c"
59 #ifdef CONFIG_KERNEL_LZMA
60 #include "../../../../lib/decompress_unlzma.c"
63 #ifdef CONFIG_KERNEL_LZO
64 #include "../../../../lib/decompress_unlzo.c"
67 #ifdef CONFIG_KERNEL_XZ
68 #include "../../../../lib/decompress_unxz.c"
71 unsigned long __stack_chk_guard;
73 void __stack_chk_guard_setup(void)
75 __stack_chk_guard = 0x000a0dff;
78 void __stack_chk_fail(void)
80 error("stack-protector: Kernel stack is corrupted\n");
83 void decompress_kernel(unsigned long boot_heap_start)
85 unsigned long zimage_start, zimage_size;
87 __stack_chk_guard_setup();
89 zimage_start = (unsigned long)(&__image_begin);
90 zimage_size = (unsigned long)(&__image_end) -
91 (unsigned long)(&__image_begin);
96 puthex(zimage_size + zimage_start);
99 /* This area are prepared for mallocing when decompressing */
100 free_mem_ptr = boot_heap_start;
101 free_mem_end_ptr = boot_heap_start + BOOT_HEAP_SIZE;
103 /* Display standard Linux/MIPS boot prompt */
104 puts("Uncompressing Linux at load address ");
105 puthex(VMLINUX_LOAD_ADDRESS_ULL);
108 /* Decompress the kernel with according algorithm */
109 decompress((char *)zimage_start, zimage_size, 0, 0,
110 (void *)VMLINUX_LOAD_ADDRESS_ULL, 0, error);
112 /* FIXME: should we flush cache here? */
113 puts("Now, booting the kernel...\n");