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 */ 28 unsigned long free_mem_ptr; 29 unsigned long free_mem_end_ptr; 30 31 void 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 72 const unsigned long __stack_chk_guard = 0x000a0dff; 73 74 void __stack_chk_fail(void) 75 { 76 error("stack-protector: Kernel stack is corrupted\n"); 77 } 78 79 void 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