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