| 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 | |
| 39 | #define KSEG0 0x80000000 |
| 40 | #define KSEG1 0xa0000000 |
| 41 | |
| 42 | #define KSEG1ADDR(a) ((((unsigned)(a)) & 0x1fffffffU) | KSEG1) |
| 43 | |
| 44 | #define Index_Invalidate_I 0x00 |
| 45 | #define Index_Writeback_Inv_D 0x01 |
| 46 | |
| 47 | #define cache_unroll(base,op) \ |
| 48 | __asm__ __volatile__( \ |
| 49 | ".set noreorder;\n" \ |
| 50 | ".set mips3;\n" \ |
| 51 | "cache %1, (%0);\n" \ |
| 52 | ".set mips0;\n" \ |
| 53 | ".set reorder\n" \ |
| 54 | : \ |
| 55 | : "r" (base), \ |
| 56 | "i" (op)); |
| 57 | |
| 58 | |
| 59 | static __inline__ void blast_icache(unsigned long size, unsigned long lsize) |
| 60 | { |
| 61 | unsigned long start = KSEG0; |
| 62 | unsigned long end = (start + size); |
| 63 | |
| 64 | while(start < end) { |
| 65 | cache_unroll(start,Index_Invalidate_I); |
| 66 | start += lsize; |
| 67 | } |
| 68 | } |
| 69 | |
| 70 | static __inline__ void blast_dcache(unsigned long size, unsigned long lsize) |
| 71 | { |
| 72 | unsigned long start = KSEG0; |
| 73 | unsigned long end = (start + size); |
| 74 | |
| 75 | while(start < end) { |
| 76 | cache_unroll(start,Index_Writeback_Inv_D); |
| 77 | start += lsize; |
| 78 | } |
| 79 | } |
| 80 | |
| 81 | unsigned char *data; |
| 82 | |
| 83 | static int read_byte(void *object, unsigned char **buffer, UInt32 *bufferSize) |
| 84 | { |
| 85 | *bufferSize = 1; |
| 86 | *buffer = data; |
| 87 | ++data; |
| 88 | return LZMA_RESULT_OK; |
| 89 | } |
| 90 | |
| 91 | static __inline__ unsigned char get_byte(void) |
| 92 | { |
| 93 | unsigned char *buffer; |
| 94 | UInt32 fake; |
| 95 | |
| 96 | return read_byte(0, &buffer, &fake), *buffer; |
| 97 | } |
| 98 | |
| 99 | /* This puts lzma workspace 128k below RAM end. |
| 100 | * That should be enough for both lzma and stack |
| 101 | */ |
| 102 | static char *buffer = (char *)(RAMSTART + RAMSIZE - 0x00020000); |
| 103 | extern char lzma_start[]; |
| 104 | extern char lzma_end[]; |
| 105 | |
| 106 | /* should be the first function */ |
| 107 | void entry(unsigned long icache_size, unsigned long icache_lsize, |
| 108 | unsigned long dcache_size, unsigned long dcache_lsize) |
| 109 | { |
| 110 | unsigned int i; /* temp value */ |
| 111 | unsigned int osize; /* uncompressed size */ |
| 112 | volatile unsigned int arg0, arg1, arg2, arg3; |
| 113 | |
| 114 | /* restore argument registers */ |
| 115 | __asm__ __volatile__ ("ori %0, $12, 0":"=r"(arg0)); |
| 116 | __asm__ __volatile__ ("ori %0, $13, 0":"=r"(arg1)); |
| 117 | __asm__ __volatile__ ("ori %0, $14, 0":"=r"(arg2)); |
| 118 | __asm__ __volatile__ ("ori %0, $15, 0":"=r"(arg3)); |
| 119 | |
| 120 | ILzmaInCallback callback; |
| 121 | CLzmaDecoderState vs; |
| 122 | callback.Read = read_byte; |
| 123 | |
| 124 | data = lzma_start; |
| 125 | |
| 126 | /* lzma args */ |
| 127 | i = get_byte(); |
| 128 | vs.Properties.lc = i % 9, i = i / 9; |
| 129 | vs.Properties.lp = i % 5, vs.Properties.pb = i / 5; |
| 130 | |
| 131 | vs.Probs = (CProb *)buffer; |
| 132 | |
| 133 | /* skip rest of the LZMA coder property */ |
| 134 | for (i = 0; i < 4; i++) |
| 135 | get_byte(); |
| 136 | |
| 137 | /* read the lower half of uncompressed size in the header */ |
| 138 | osize = ((unsigned int)get_byte()) + |
| 139 | ((unsigned int)get_byte() << 8) + |
| 140 | ((unsigned int)get_byte() << 16) + |
| 141 | ((unsigned int)get_byte() << 24); |
| 142 | |
| 143 | /* skip rest of the header (upper half of uncompressed size) */ |
| 144 | for (i = 0; i < 4; i++) |
| 145 | get_byte(); |
| 146 | |
| 147 | /* decompress kernel */ |
| 148 | if ((i = LzmaDecode(&vs, &callback, |
| 149 | (unsigned char*)KERNEL_ENTRY, osize, &osize)) == LZMA_RESULT_OK) |
| 150 | { |
| 151 | blast_dcache(dcache_size, dcache_lsize); |
| 152 | blast_icache(icache_size, icache_lsize); |
| 153 | |
| 154 | /* Jump to load address */ |
| 155 | ((void (*)(int a0, int a1, int a2, int a3)) KERNEL_ENTRY)(arg0, arg1, arg2, arg3); |
| 156 | } |
| 157 | } |
| 158 | |
