| 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 | |
| 42 | register volatile gd_t *gd asm ("k0"); |
| 43 | unsigned char *data; |
| 44 | |
| 45 | static __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 | */ |
| 58 | static char *buffer = (char *)(RAMSTART + RAMSIZE - 0x00020000); |
| 59 | extern char _binary_vmlinux_lzma_start[]; |
| 60 | extern char _binary_vmlinux_lzma_end[]; |
| 61 | extern char lzma_start[]; |
| 62 | extern char lzma_end[]; |
| 63 | |
| 64 | /* should be the first function */ |
| 65 | void 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 | |
