1 /* 2 * Copyright 2001 MontaVista Software Inc. 3 * Author: Matt Porter <mporter@mvista.com> 4 * 5 * Copyright (C) 2009 Lemote, Inc. 6 * Author: Wu Zhangjin <wuzhangjin@gmail.com> 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License as published by the 10 * Free Software Foundation; either version 2 of the License, or (at your 11 * option) any later version. 12 */ 13 14 #include <linux/types.h> 15 #include <linux/kernel.h> 16 #include <linux/string.h> 17 #include <linux/libfdt.h> 18 19 #include <asm/addrspace.h> 20 21 /* 22 * These two variables specify the free mem region 23 * that can be used for temporary malloc area 24 */ 25 unsigned long free_mem_ptr; 26 unsigned long free_mem_end_ptr; 27 28 /* The linker tells us where the image is. */ 29 extern unsigned char __image_begin, __image_end; 30 31 /* debug interfaces */ 32 #ifdef CONFIG_DEBUG_ZBOOT 33 extern void puts(const char *s); 34 extern void puthex(unsigned long long val); 35 #else 36 #define puts(s) do {} while (0) 37 #define puthex(val) do {} while (0) 38 #endif 39 40 extern char __appended_dtb[]; 41 42 void error(char *x) 43 { 44 puts("\n\n"); 45 puts(x); 46 puts("\n\n -- System halted"); 47 48 while (1) 49 ; /* Halt */ 50 } 51 52 /* activate the code for pre-boot environment */ 53 #define STATIC static 54 55 #ifdef CONFIG_KERNEL_GZIP 56 #include "../../../../lib/decompress_inflate.c" 57 #endif 58 59 #ifdef CONFIG_KERNEL_BZIP2 60 #include "../../../../lib/decompress_bunzip2.c" 61 #endif 62 63 #ifdef CONFIG_KERNEL_LZ4 64 #include "../../../../lib/decompress_unlz4.c" 65 #endif 66 67 #ifdef CONFIG_KERNEL_LZMA 68 #include "../../../../lib/decompress_unlzma.c" 69 #endif 70 71 #ifdef CONFIG_KERNEL_LZO 72 #include "../../../../lib/decompress_unlzo.c" 73 #endif 74 75 #ifdef CONFIG_KERNEL_XZ 76 #include "../../../../lib/decompress_unxz.c" 77 #endif 78 79 const unsigned long __stack_chk_guard = 0x000a0dff; 80 81 void __stack_chk_fail(void) 82 { 83 error("stack-protector: Kernel stack is corrupted\n"); 84 } 85 86 void decompress_kernel(unsigned long boot_heap_start) 87 { 88 unsigned long zimage_start, zimage_size; 89 90 zimage_start = (unsigned long)(&__image_begin); 91 zimage_size = (unsigned long)(&__image_end) - 92 (unsigned long)(&__image_begin); 93 94 puts("zimage at: "); 95 puthex(zimage_start); 96 puts(" "); 97 puthex(zimage_size + zimage_start); 98 puts("\n"); 99 100 /* 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; 103 104 /* Display standard Linux/MIPS boot prompt */ 105 puts("Uncompressing Linux at load address "); 106 puthex(VMLINUX_LOAD_ADDRESS_ULL); 107 puts("\n"); 108 109 /* Decompress the kernel with according algorithm */ 110 __decompress((char *)zimage_start, zimage_size, 0, 0, 111 (void *)VMLINUX_LOAD_ADDRESS_ULL, 0, 0, error); 112 113 if (IS_ENABLED(CONFIG_MIPS_RAW_APPENDED_DTB) && 114 fdt_magic((void *)&__appended_dtb) == FDT_MAGIC) { 115 unsigned int image_size, dtb_size; 116 117 dtb_size = fdt_totalsize((void *)&__appended_dtb); 118 119 /* last four bytes is always image size in little endian */ 120 image_size = le32_to_cpup((void *)&__image_end - 4); 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