1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright 2001 MontaVista Software Inc.
* Author: Matt Porter <mporter@mvista.com>
*
* Copyright (C) 2009 Lemote, Inc.
* Author: Wu Zhangjin <wuzhangjin@gmail.com>
*/
#define DISABLE_BRANCH_PROFILING
#define __NO_FORTIFY
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/libfdt.h>
#include <asm/addrspace.h>
#include <asm/unaligned.h>
#include <asm-generic/vmlinux.lds.h>
/*
* These two variables specify the free mem region
* that can be used for temporary malloc area
*/
unsigned long free_mem_ptr;
unsigned long free_mem_end_ptr;
/* The linker tells us where the image is. */
extern unsigned char __image_begin[], __image_end[];
/* debug interfaces */
#ifdef CONFIG_DEBUG_ZBOOT
extern void puts(const char *s);
extern void puthex(unsigned long long val);
#else
#define puts(s) do {} while (0)
#define puthex(val) do {} while (0)
#endif
extern char __appended_dtb[];
void error(char *x)
{
puts("\n\n");
puts(x);
puts("\n\n -- System halted");
while (1)
; /* Halt */
}
/* activate the code for pre-boot environment */
#define STATIC static
#ifdef CONFIG_KERNEL_GZIP
#include "../../../../lib/decompress_inflate.c"
#endif
#ifdef CONFIG_KERNEL_BZIP2
#include "../../../../lib/decompress_bunzip2.c"
#endif
#ifdef CONFIG_KERNEL_LZ4
#include "../../../../lib/decompress_unlz4.c"
#endif
#ifdef CONFIG_KERNEL_LZMA
#include "../../../../lib/decompress_unlzma.c"
#endif
#ifdef CONFIG_KERNEL_LZO
#include "../../../../lib/decompress_unlzo.c"
#endif
#ifdef CONFIG_KERNEL_XZ
#include "../../../../lib/decompress_unxz.c"
#endif
#ifdef CONFIG_KERNEL_ZSTD
#include "../../../../lib/decompress_unzstd.c"
#endif
const unsigned long __stack_chk_guard = 0x000a0dff;
void __stack_chk_fail(void)
{
error("stack-protector: Kernel stack is corrupted\n");
}
void decompress_kernel(unsigned long boot_heap_start)
{
unsigned long zimage_start, zimage_size;
zimage_start = (unsigned long)(__image_begin);
zimage_size = (unsigned long)(__image_end) -
(unsigned long)(__image_begin);
puts("zimage at: ");
puthex(zimage_start);
puts(" ");
puthex(zimage_size + zimage_start);
puts("\n");
/* This area are prepared for mallocing when decompressing */
free_mem_ptr = boot_heap_start;
free_mem_end_ptr = boot_heap_start + BOOT_HEAP_SIZE;
/* Display standard Linux/MIPS boot prompt */
puts("Uncompressing Linux at load address ");
puthex(VMLINUX_LOAD_ADDRESS_ULL);
puts("\n");
/* Decompress the kernel with according algorithm */
__decompress((char *)zimage_start, zimage_size, 0, 0,
(void *)VMLINUX_LOAD_ADDRESS_ULL, 0, 0, error);
if (IS_ENABLED(CONFIG_MIPS_RAW_APPENDED_DTB) &&
fdt_magic((void *)&__appended_dtb) == FDT_MAGIC) {
unsigned int image_size, dtb_size;
dtb_size = fdt_totalsize((void *)&__appended_dtb);
/* last four bytes is always image size in little endian */
image_size = get_unaligned_le32((void *)__image_end - 4);
/* The device tree's address must be properly aligned */
image_size = ALIGN(image_size, STRUCT_ALIGNMENT);
puts("Copy device tree to address ");
puthex(VMLINUX_LOAD_ADDRESS_ULL + image_size);
puts("\n");
/* copy dtb to where the booted kernel will expect it */
memcpy((void *)VMLINUX_LOAD_ADDRESS_ULL + image_size,
__appended_dtb, dtb_size);
}
/* FIXME: should we flush cache here? */
puts("Now, booting the kernel...\n");
}
|
