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 17 /* 18 * These two variables specify the free mem region 19 * that can be used for temporary malloc area 20 */ 21 unsigned long free_mem_ptr; 22 unsigned long free_mem_end_ptr; 23 24 /* The linker tells us where the image is. */ 25 extern unsigned char __image_begin, __image_end; 26 27 /* debug interfaces */ 28 #ifdef CONFIG_DEBUG_ZBOOT 29 extern void puts(const char *s); 30 extern void puthex(unsigned long long val); 31 #else 32 #define puts(s) do {} while (0) 33 #define puthex(val) do {} while (0) 34 #endif 35 36 extern char __appended_dtb[]; 37 38 void error(char *x) 39 { 40 puts("\n\n"); 41 puts(x); 42 puts("\n\n -- System halted"); 43 44 while (1) 45 ; /* Halt */ 46 } 47 48 /* activate the code for pre-boot environment */ 49 #define STATIC static 50 51 #ifdef CONFIG_KERNEL_GZIP 52 #include "../../../../lib/decompress_inflate.c" 53 #endif 54 55 #ifdef CONFIG_KERNEL_BZIP2 56 #include "../../../../lib/decompress_bunzip2.c" 57 #endif 58 59 #ifdef CONFIG_KERNEL_LZ4 60 #include "../../../../lib/decompress_unlz4.c" 61 #endif 62 63 #ifdef CONFIG_KERNEL_LZMA 64 #include "../../../../lib/decompress_unlzma.c" 65 #endif 66 67 #ifdef CONFIG_KERNEL_LZO 68 #include "../../../../lib/decompress_unlzo.c" 69 #endif 70 71 #ifdef CONFIG_KERNEL_XZ 72 #include "../../../../lib/decompress_unxz.c" 73 #endif 74 75 const unsigned long __stack_chk_guard = 0x000a0dff; 76 77 void __stack_chk_fail(void) 78 { 79 error("stack-protector: Kernel stack is corrupted\n"); 80 } 81 82 void decompress_kernel(unsigned long boot_heap_start) 83 { 84 unsigned long zimage_start, zimage_size; 85 86 zimage_start = (unsigned long)(&__image_begin); 87 zimage_size = (unsigned long)(&__image_end) - 88 (unsigned long)(&__image_begin); 89 90 puts("zimage at: "); 91 puthex(zimage_start); 92 puts(" "); 93 puthex(zimage_size + zimage_start); 94 puts("\n"); 95 96 /* This area are prepared for mallocing when decompressing */ 97 free_mem_ptr = boot_heap_start; 98 free_mem_end_ptr = boot_heap_start + BOOT_HEAP_SIZE; 99 100 /* Display standard Linux/MIPS boot prompt */ 101 puts("Uncompressing Linux at load address "); 102 puthex(VMLINUX_LOAD_ADDRESS_ULL); 103 puts("\n"); 104 105 /* Decompress the kernel with according algorithm */ 106 __decompress((char *)zimage_start, zimage_size, 0, 0, 107 (void *)VMLINUX_LOAD_ADDRESS_ULL, 0, 0, error); 108 109 if (IS_ENABLED(CONFIG_MIPS_RAW_APPENDED_DTB) && 110 fdt_magic((void *)&__appended_dtb) == FDT_MAGIC) { 111 unsigned int image_size, dtb_size; 112 113 dtb_size = fdt_totalsize((void *)&__appended_dtb); 114 115 /* last four bytes is always image size in little endian */ 116 image_size = le32_to_cpup((void *)&__image_end - 4); 117 118 /* copy dtb to where the booted kernel will expect it */ 119 memcpy((void *)VMLINUX_LOAD_ADDRESS_ULL + image_size, 120 __appended_dtb, dtb_size); 121 } 122 123 /* FIXME: should we flush cache here? */ 124 puts("Now, booting the kernel...\n"); 125 } 126