1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright 2001 MontaVista Software Inc.
4 * Author: Matt Porter <mporter@mvista.com>
6 * Copyright (C) 2009 Lemote, Inc.
7 * Author: Wu Zhangjin <wuzhangjin@gmail.com>
10 #include <linux/types.h>
11 #include <linux/kernel.h>
12 #include <linux/string.h>
13 #include <linux/libfdt.h>
15 #include <asm/addrspace.h>
18 * These two variables specify the free mem region
19 * that can be used for temporary malloc area
21 unsigned long free_mem_ptr;
22 unsigned long free_mem_end_ptr;
24 /* The linker tells us where the image is. */
25 extern unsigned char __image_begin, __image_end;
27 /* debug interfaces */
28 #ifdef CONFIG_DEBUG_ZBOOT
29 extern void puts(const char *s);
30 extern void puthex(unsigned long long val);
32 #define puts(s) do {} while (0)
33 #define puthex(val) do {} while (0)
36 extern char __appended_dtb[];
42 puts("\n\n -- System halted");
48 /* activate the code for pre-boot environment */
51 #ifdef CONFIG_KERNEL_GZIP
52 #include "../../../../lib/decompress_inflate.c"
55 #ifdef CONFIG_KERNEL_BZIP2
56 #include "../../../../lib/decompress_bunzip2.c"
59 #ifdef CONFIG_KERNEL_LZ4
60 #include "../../../../lib/decompress_unlz4.c"
63 #ifdef CONFIG_KERNEL_LZMA
64 #include "../../../../lib/decompress_unlzma.c"
67 #ifdef CONFIG_KERNEL_LZO
68 #include "../../../../lib/decompress_unlzo.c"
71 #ifdef CONFIG_KERNEL_XZ
72 #include "../../../../lib/decompress_unxz.c"
75 #ifdef CONFIG_KERNEL_ZSTD
76 #include "../../../../lib/decompress_unzstd.c"
79 const unsigned long __stack_chk_guard = 0x000a0dff;
81 void __stack_chk_fail(void)
83 error("stack-protector: Kernel stack is corrupted\n");
86 void decompress_kernel(unsigned long boot_heap_start)
88 unsigned long zimage_start, zimage_size;
90 zimage_start = (unsigned long)(&__image_begin);
91 zimage_size = (unsigned long)(&__image_end) -
92 (unsigned long)(&__image_begin);
97 puthex(zimage_size + zimage_start);
100 /* This area are prepared for mallocing when decompressing */
101 free_mem_ptr = boot_heap_start;
102 free_mem_end_ptr = boot_heap_start + BOOT_HEAP_SIZE;
104 /* Display standard Linux/MIPS boot prompt */
105 puts("Uncompressing Linux at load address ");
106 puthex(VMLINUX_LOAD_ADDRESS_ULL);
109 /* Decompress the kernel with according algorithm */
110 __decompress((char *)zimage_start, zimage_size, 0, 0,
111 (void *)VMLINUX_LOAD_ADDRESS_ULL, 0, 0, error);
113 if (IS_ENABLED(CONFIG_MIPS_RAW_APPENDED_DTB) &&
114 fdt_magic((void *)&__appended_dtb) == FDT_MAGIC) {
115 unsigned int image_size, dtb_size;
117 dtb_size = fdt_totalsize((void *)&__appended_dtb);
119 /* last four bytes is always image size in little endian */
120 image_size = le32_to_cpup((void *)&__image_end - 4);
122 /* copy dtb to where the booted kernel will expect it */
123 memcpy((void *)VMLINUX_LOAD_ADDRESS_ULL + image_size,
124 __appended_dtb, dtb_size);
127 /* FIXME: should we flush cache here? */
128 puts("Now, booting the kernel...\n");