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 #define DISABLE_BRANCH_PROFILING
16 #include <linux/types.h>
17 #include <linux/kernel.h>
18 #include <linux/string.h>
19 #include <linux/libfdt.h>
21 #include <asm/addrspace.h>
22 #include <asm/unaligned.h>
25 * These two variables specify the free mem region
26 * that can be used for temporary malloc area
28 unsigned long free_mem_ptr;
29 unsigned long free_mem_end_ptr;
31 /* The linker tells us where the image is. */
32 extern unsigned char __image_begin, __image_end;
34 /* debug interfaces */
35 #ifdef CONFIG_DEBUG_ZBOOT
36 extern void puts(const char *s);
37 extern void puthex(unsigned long long val);
39 #define puts(s) do {} while (0)
40 #define puthex(val) do {} while (0)
43 extern char __appended_dtb[];
49 puts("\n\n -- System halted");
55 /* activate the code for pre-boot environment */
58 #ifdef CONFIG_KERNEL_GZIP
59 #include "../../../../lib/decompress_inflate.c"
62 #ifdef CONFIG_KERNEL_BZIP2
63 #include "../../../../lib/decompress_bunzip2.c"
66 #ifdef CONFIG_KERNEL_LZ4
67 #include "../../../../lib/decompress_unlz4.c"
70 #ifdef CONFIG_KERNEL_LZMA
71 #include "../../../../lib/decompress_unlzma.c"
74 #ifdef CONFIG_KERNEL_LZO
75 #include "../../../../lib/decompress_unlzo.c"
78 #ifdef CONFIG_KERNEL_XZ
79 #include "../../../../lib/decompress_unxz.c"
82 const unsigned long __stack_chk_guard = 0x000a0dff;
84 void __stack_chk_fail(void)
86 error("stack-protector: Kernel stack is corrupted\n");
89 void decompress_kernel(unsigned long boot_heap_start)
91 unsigned long zimage_start, zimage_size;
93 zimage_start = (unsigned long)(&__image_begin);
94 zimage_size = (unsigned long)(&__image_end) -
95 (unsigned long)(&__image_begin);
100 puthex(zimage_size + zimage_start);
103 /* This area are prepared for mallocing when decompressing */
104 free_mem_ptr = boot_heap_start;
105 free_mem_end_ptr = boot_heap_start + BOOT_HEAP_SIZE;
107 /* Display standard Linux/MIPS boot prompt */
108 puts("Uncompressing Linux at load address ");
109 puthex(VMLINUX_LOAD_ADDRESS_ULL);
112 /* Decompress the kernel with according algorithm */
113 __decompress((char *)zimage_start, zimage_size, 0, 0,
114 (void *)VMLINUX_LOAD_ADDRESS_ULL, 0, 0, error);
116 if (IS_ENABLED(CONFIG_MIPS_RAW_APPENDED_DTB) &&
117 fdt_magic((void *)&__appended_dtb) == FDT_MAGIC) {
118 unsigned int image_size, dtb_size;
120 dtb_size = fdt_totalsize((void *)&__appended_dtb);
122 /* last four bytes is always image size in little endian */
123 image_size = get_unaligned_le32((void *)&__image_end - 4);
125 /* copy dtb to where the booted kernel will expect it */
126 memcpy((void *)VMLINUX_LOAD_ADDRESS_ULL + image_size,
127 __appended_dtb, dtb_size);
130 /* FIXME: should we flush cache here? */
131 puts("Now, booting the kernel...\n");