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