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#include <linux/string.h>
17
18#include <asm/addrspace.h>
19
20/*
21 * These two variables specify the free mem region
22 * that can be used for temporary malloc area
23 */
24unsigned long free_mem_ptr;
25unsigned long free_mem_end_ptr;
26
27/* The linker tells us where the image is. */
28extern unsigned char __image_begin, __image_end;
29
30/* debug interfaces  */
31extern void puts(const char *s);
32extern void puthex(unsigned long long val);
33
34void error(char *x)
35{
36	puts("\n\n");
37	puts(x);
38	puts("\n\n -- System halted");
39
40	while (1)
41		;	/* Halt */
42}
43
44/* activate the code for pre-boot environment */
45#define STATIC static
46
47#ifdef CONFIG_KERNEL_GZIP
48#include "../../../../lib/decompress_inflate.c"
49#endif
50
51#ifdef CONFIG_KERNEL_BZIP2
52#include "../../../../lib/decompress_bunzip2.c"
53#endif
54
55#ifdef CONFIG_KERNEL_LZ4
56#include "../../../../lib/decompress_unlz4.c"
57#endif
58
59#ifdef CONFIG_KERNEL_LZMA
60#include "../../../../lib/decompress_unlzma.c"
61#endif
62
63#ifdef CONFIG_KERNEL_LZO
64#include "../../../../lib/decompress_unlzo.c"
65#endif
66
67#ifdef CONFIG_KERNEL_XZ
68#include "../../../../lib/decompress_unxz.c"
69#endif
70
71unsigned long __stack_chk_guard;
72
73void __stack_chk_guard_setup(void)
74{
75	__stack_chk_guard = 0x000a0dff;
76}
77
78void __stack_chk_fail(void)
79{
80	error("stack-protector: Kernel stack is corrupted\n");
81}
82
83void decompress_kernel(unsigned long boot_heap_start)
84{
85	unsigned long zimage_start, zimage_size;
86
87	__stack_chk_guard_setup();
88
89	zimage_start = (unsigned long)(&__image_begin);
90	zimage_size = (unsigned long)(&__image_end) -
91	    (unsigned long)(&__image_begin);
92
93	puts("zimage at:     ");
94	puthex(zimage_start);
95	puts(" ");
96	puthex(zimage_size + zimage_start);
97	puts("\n");
98
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;
102
103	/* Display standard Linux/MIPS boot prompt */
104	puts("Uncompressing Linux at load address ");
105	puthex(VMLINUX_LOAD_ADDRESS_ULL);
106	puts("\n");
107
108	/* Decompress the kernel with according algorithm */
109	decompress((char *)zimage_start, zimage_size, 0, 0,
110		   (void *)VMLINUX_LOAD_ADDRESS_ULL, 0, error);
111
112	/* FIXME: should we flush cache here? */
113	puts("Now, booting the kernel...\n");
114}
115