1/* 2 * LZMA compressed kernel decompressor for bcm947xx boards 3 * 4 * Copyright (C) 2005 by Oleg I. Vdovikin <oleg@cs.msu.su> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 * 20 * 21 * Please note, this was code based on the bunzip2 decompressor code 22 * by Manuel Novoa III (mjn3@codepoet.org), although the only thing left 23 * is an idea and part of original vendor code 24 * 25 * 26 * 12-Mar-2005 Mineharu Takahara <mtakahar@yahoo.com> 27 * pass actual output size to decoder (stream mode 28 * compressed input is not a requirement anymore) 29 * 30 * 24-Apr-2005 Oleg I. Vdovikin 31 * reordered functions using lds script, removed forward decl 32 * 33 * ??-Nov-2005 Mike Baker 34 * reorder the script as an lzma wrapper; do not depend on flash access 35 */ 36 37#include "LzmaDecode.h" 38#include <exports.h> 39 40#define KSEG0ADDR(addr) (0x80000000|addr) 41 42register volatile gd_t *gd asm ("k0"); 43unsigned char *data; 44 45static __inline__ unsigned char get_byte() 46{ 47 unsigned char *buffer; 48 49 buffer = data; 50 data++; 51 52 return *buffer; 53} 54 55/* This puts lzma workspace 128k below RAM end. 56 * That should be enough for both lzma and stack 57 */ 58static char *buffer = (char *)(RAMSTART + RAMSIZE - 0x00020000); 59extern char _binary_vmlinux_lzma_start[]; 60extern char _binary_vmlinux_lzma_end[]; 61extern char lzma_start[]; 62extern char lzma_end[]; 63 64/* should be the first function */ 65void entry(unsigned int arg0, unsigned int arg1, 66 unsigned int arg2, unsigned int arg3) 67{ 68 unsigned int i; /* temp value */ 69 unsigned int isize; /* compressed size */ 70 unsigned int osize; /* uncompressed size */ 71 int argc = arg0; 72 char **argv = (char **)arg1; 73 char **envp = (char **)arg2; 74 75 CLzmaDecoderState vs; 76 77 data = (unsigned char *)_binary_vmlinux_lzma_start; 78 isize = _binary_vmlinux_lzma_end - _binary_vmlinux_lzma_start + 1; 79 80 puts("\nLZMA kernel loader\n"); 81 82 printf("lzma data @ %#x - %#x\n", _binary_vmlinux_lzma_start, _binary_vmlinux_lzma_end); 83 printf("load addr @ %#x\n\n", KERNEL_ENTRY); 84 printf("jump table @ %#x\n", gd->jt[3]); 85 86 /* lzma args */ 87 i = get_byte(); 88 vs.Properties.lc = i % 9, i = i / 9; 89 vs.Properties.lp = i % 5, vs.Properties.pb = i / 5; 90 91 vs.Probs = (CProb *)buffer; 92 93 /* skip rest of the LZMA coder property */ 94 data += 4; 95 96 /* read the lower half of uncompressed size in the header */ 97 osize = ((unsigned int)get_byte()) + 98 ((unsigned int)get_byte() << 8) + 99 ((unsigned int)get_byte() << 16) + 100 ((unsigned int)get_byte() << 24); 101 102 /* skip rest of the header (upper half of uncompressed size) */ 103 data += 4; 104 105 /* decompress kernel */ 106 puts("\nDecompressing kernel..."); 107 if ((i = LzmaDecode(&vs, 108 (unsigned char*)data, isize, &isize, 109 (unsigned char*)KERNEL_ENTRY, osize, &osize)) == LZMA_RESULT_OK) 110 { 111 puts("success!\n"); 112 113 /* Jump to load address */ 114// ((void (*)(int a0, int a1, int a2, int a3))KERNEL_ENTRY)(0,0,0,0); 115 ((void (*)(int a0, int a1, int a2, int a3))KERNEL_ENTRY)(arg0, arg1, arg2, arg3); 116 } 117 puts("failure!\n"); 118} 119