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#include <linux/types.h>
13#include <linux/kernel.h>
14#include <linux/string.h>
15#include <linux/libfdt.h>
16
17#include <asm/addrspace.h>
18#include <asm/unaligned.h>
19
20/*
21 * These two variables specify the free mem region
22 * that can be used for temporary malloc area
23 */
24unsigned long free_mem_ptr;
25unsigned long free_mem_end_ptr;
26
27/* The linker tells us where the image is. */
28extern unsigned char __image_begin, __image_end;
29
30/* debug interfaces  */
31#ifdef CONFIG_DEBUG_ZBOOT
32extern void puts(const char *s);
33extern void puthex(unsigned long long val);
34#else
35#define puts(s) do {} while (0)
36#define puthex(val) do {} while (0)
37#endif
38
39extern char __appended_dtb[];
40
41void error(char *x)
42{
43	puts("\n\n");
44	puts(x);
45	puts("\n\n -- System halted");
46
47	while (1)
48		;	/* Halt */
49}
50
51/* activate the code for pre-boot environment */
52#define STATIC static
53
54#ifdef CONFIG_KERNEL_GZIP
55#include "../../../../lib/decompress_inflate.c"
56#endif
57
58#ifdef CONFIG_KERNEL_BZIP2
59#include "../../../../lib/decompress_bunzip2.c"
60#endif
61
62#ifdef CONFIG_KERNEL_LZ4
63#include "../../../../lib/decompress_unlz4.c"
64#endif
65
66#ifdef CONFIG_KERNEL_LZMA
67#include "../../../../lib/decompress_unlzma.c"
68#endif
69
70#ifdef CONFIG_KERNEL_LZO
71#include "../../../../lib/decompress_unlzo.c"
72#endif
73
74#ifdef CONFIG_KERNEL_XZ
75#include "../../../../lib/decompress_unxz.c"
76#endif
77
78#ifdef CONFIG_KERNEL_ZSTD
79#include "../../../../lib/decompress_unzstd.c"
80#endif
81
82const unsigned long __stack_chk_guard = 0x000a0dff;
83
84void __stack_chk_fail(void)
85{
86	error("stack-protector: Kernel stack is corrupted\n");
87}
88
89void decompress_kernel(unsigned long boot_heap_start)
90{
91	unsigned long zimage_start, zimage_size;
92
93	zimage_start = (unsigned long)(&__image_begin);
94	zimage_size = (unsigned long)(&__image_end) -
95	    (unsigned long)(&__image_begin);
96
97	puts("zimage at:     ");
98	puthex(zimage_start);
99	puts(" ");
100	puthex(zimage_size + zimage_start);
101	puts("\n");
102
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;
106
107	/* Display standard Linux/MIPS boot prompt */
108	puts("Uncompressing Linux at load address ");
109	puthex(VMLINUX_LOAD_ADDRESS_ULL);
110	puts("\n");
111
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);
115
116	if (IS_ENABLED(CONFIG_MIPS_RAW_APPENDED_DTB) &&
117	    fdt_magic((void *)&__appended_dtb) == FDT_MAGIC) {
118		unsigned int image_size, dtb_size;
119
120		dtb_size = fdt_totalsize((void *)&__appended_dtb);
121
122		/* last four bytes is always image size in little endian */
123		image_size = get_unaligned_le32((void *)&__image_end - 4);
124
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);
128	}
129
130	/* FIXME: should we flush cache here? */
131	puts("Now, booting the kernel...\n");
132}
133