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