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 #ifdef CONFIG_KERNEL_GZIP 47 #include "../../../../lib/decompress_inflate.c" 48 #endif 49 50 #ifdef CONFIG_KERNEL_BZIP2 51 #include "../../../../lib/decompress_bunzip2.c" 52 #endif 53 54 #ifdef CONFIG_KERNEL_LZ4 55 #include "../../../../lib/decompress_unlz4.c" 56 #endif 57 58 #ifdef CONFIG_KERNEL_LZMA 59 #include "../../../../lib/decompress_unlzma.c" 60 #endif 61 62 #ifdef CONFIG_KERNEL_LZO 63 #include "../../../../lib/decompress_unlzo.c" 64 #endif 65 66 #ifdef CONFIG_KERNEL_XZ 67 #include "../../../../lib/decompress_unxz.c" 68 #endif 69 70 void decompress_kernel(unsigned long boot_heap_start) 71 { 72 unsigned long zimage_start, zimage_size; 73 74 zimage_start = (unsigned long)(&__image_begin); 75 zimage_size = (unsigned long)(&__image_end) - 76 (unsigned long)(&__image_begin); 77 78 puts("zimage at: "); 79 puthex(zimage_start); 80 puts(" "); 81 puthex(zimage_size + zimage_start); 82 puts("\n"); 83 84 /* This area are prepared for mallocing when decompressing */ 85 free_mem_ptr = boot_heap_start; 86 free_mem_end_ptr = boot_heap_start + BOOT_HEAP_SIZE; 87 88 /* Display standard Linux/MIPS boot prompt */ 89 puts("Uncompressing Linux at load address "); 90 puthex(VMLINUX_LOAD_ADDRESS_ULL); 91 puts("\n"); 92 93 /* Decompress the kernel with according algorithm */ 94 decompress((char *)zimage_start, zimage_size, 0, 0, 95 (void *)VMLINUX_LOAD_ADDRESS_ULL, 0, error); 96 97 /* FIXME: should we flush cache here? */ 98 puts("Now, booting the kernel...\n"); 99 } 100