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 */ 23unsigned long free_mem_ptr; 24unsigned long free_mem_end_ptr; 25 26/* The linker tells us where the image is. */ 27extern unsigned char __image_begin, __image_end; 28 29/* debug interfaces */ 30extern void puts(const char *s); 31extern void puthex(unsigned long long val); 32 33void 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 47void *memcpy(void *dest, const void *src, size_t n) 48{ 49 int i; 50 const char *s = src; 51 char *d = dest; 52 53 for (i = 0; i < n; i++) 54 d[i] = s[i]; 55 return dest; 56} 57#include "../../../../lib/decompress_inflate.c" 58#endif 59 60#ifdef CONFIG_KERNEL_BZIP2 61void *memset(void *s, int c, size_t n) 62{ 63 int i; 64 char *ss = s; 65 66 for (i = 0; i < n; i++) 67 ss[i] = c; 68 return s; 69} 70#include "../../../../lib/decompress_bunzip2.c" 71#endif 72 73#ifdef CONFIG_KERNEL_LZMA 74#include "../../../../lib/decompress_unlzma.c" 75#endif 76 77#ifdef CONFIG_KERNEL_LZO 78#include "../../../../lib/decompress_unlzo.c" 79#endif 80 81void decompress_kernel(unsigned long boot_heap_start) 82{ 83 unsigned long zimage_start, zimage_size; 84 85 zimage_start = (unsigned long)(&__image_begin); 86 zimage_size = (unsigned long)(&__image_end) - 87 (unsigned long)(&__image_begin); 88 89 puts("zimage at: "); 90 puthex(zimage_start); 91 puts(" "); 92 puthex(zimage_size + zimage_start); 93 puts("\n"); 94 95 /* This area are prepared for mallocing when decompressing */ 96 free_mem_ptr = boot_heap_start; 97 free_mem_end_ptr = boot_heap_start + BOOT_HEAP_SIZE; 98 99 /* Display standard Linux/MIPS boot prompt */ 100 puts("Uncompressing Linux at load address "); 101 puthex(VMLINUX_LOAD_ADDRESS_ULL); 102 puts("\n"); 103 104 /* Decompress the kernel with according algorithm */ 105 decompress((char *)zimage_start, zimage_size, 0, 0, 106 (void *)VMLINUX_LOAD_ADDRESS_ULL, 0, error); 107 108 puts("Now, booting the kernel...\n"); 109} 110