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