2 * LZMA compressed kernel decompressor for bcm947xx boards
4 * Copyright (C) 2005 by Oleg I. Vdovikin <oleg@cs.msu.su>
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.
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.
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
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
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)
30 * 24-Apr-2005 Oleg I. Vdovikin
31 * reordered functions using lds script, removed forward decl
33 * 24-Mar-2007 Gabor Juhos
34 * pass original values of the a0,a1,a2,a3 registers to the kernel
38 #include "LzmaDecode.h"
40 #define BCM4710_FLASH 0x1fc00000 /* Flash */
42 #define KSEG0 0x80000000
43 #define KSEG1 0xa0000000
45 #define KSEG1ADDR(a) ((((unsigned)(a)) & 0x1fffffffU) | KSEG1)
47 #define Index_Invalidate_I 0x00
48 #define Index_Writeback_Inv_D 0x01
50 #define cache_unroll(base,op) \
51 __asm__ __volatile__( \
61 static __inline__ void blast_icache(unsigned long size, unsigned long lsize)
63 unsigned long start = KSEG0;
64 unsigned long end = (start + size);
67 cache_unroll(start,Index_Invalidate_I);
72 static __inline__ void blast_dcache(unsigned long size, unsigned long lsize)
74 unsigned long start = KSEG0;
75 unsigned long end = (start + size);
78 cache_unroll(start,Index_Writeback_Inv_D);
83 #define TRX_MAGIC 0x30524448 /* "HDR0" */
86 unsigned int magic; /* "HDR0" */
87 unsigned int len; /* Length of file including header */
88 unsigned int crc32; /* 32-bit CRC from flag_version to end of file */
89 unsigned int flag_version; /* 0:15 flags, 16:31 version */
90 unsigned int offsets[3]; /* Offsets of partitions from start of header */
93 /* beyound the image end, size not known in advance */
94 extern unsigned char workspace[];
99 typedef void (*kernel_entry)(unsigned long reg_a0, unsigned long reg_a1,
100 unsigned long reg_a2, unsigned long reg_a3);
102 /* flash access should be aligned, so wrapper is used */
103 /* read byte from the flash, all accesses are 32-bit aligned */
104 static int read_byte(void *object, unsigned char **buffer, UInt32 *bufferSize)
106 static unsigned int val;
108 if (((unsigned int)offset % 4) == 0) {
109 val = *(unsigned int *)data;
114 *buffer = ((unsigned char *)&val) + (offset++ & 3);
116 return LZMA_RESULT_OK;
119 static __inline__ unsigned char get_byte(void)
121 unsigned char *buffer;
124 return read_byte(0, &buffer, &fake), *buffer;
127 /* should be the first function */
128 void entry(unsigned long reg_a0, unsigned long reg_a1,
129 unsigned long reg_a2, unsigned long reg_a3,
130 unsigned long icache_size, unsigned long icache_lsize,
131 unsigned long dcache_size, unsigned long dcache_lsize)
133 unsigned int i; /* temp value */
134 unsigned int lc; /* literal context bits */
135 unsigned int lp; /* literal pos state bits */
136 unsigned int pb; /* pos state bits */
137 unsigned int osize; /* uncompressed size */
139 ILzmaInCallback callback;
140 callback.Read = read_byte;
142 uart_write_str("decompress kernel ... ");
144 /* look for trx header, 32-bit data access */
145 for (data = ((unsigned char *) KSEG1ADDR(BCM4710_FLASH));
146 ((struct trx_header *)data)->magic != TRX_MAGIC; data += 65536);
148 /* compressed kernel is in the partition 0 or 1 */
149 if (((struct trx_header *)data)->offsets[1] > 65536)
150 data += ((struct trx_header *)data)->offsets[0];
152 data += ((struct trx_header *)data)->offsets[1];
158 lc = i % 9, i = i / 9;
159 lp = i % 5, pb = i / 5;
161 /* skip rest of the LZMA coder property */
162 for (i = 0; i < 4; i++)
165 /* read the lower half of uncompressed size in the header */
166 osize = ((unsigned int)get_byte()) +
167 ((unsigned int)get_byte() << 8) +
168 ((unsigned int)get_byte() << 16) +
169 ((unsigned int)get_byte() << 24);
171 /* skip rest of the header (upper half of uncompressed size) */
172 for (i = 0; i < 4; i++)
175 /* decompress kernel */
176 if (LzmaDecode(workspace, ~0, lc, lp, pb, &callback,
177 (unsigned char*)LOADADDR, osize, &i) == LZMA_RESULT_OK)
179 blast_dcache(dcache_size, dcache_lsize);
180 blast_icache(icache_size, icache_lsize);
182 /* Jump to load address */
183 uart_write_str("ok\r\n");
184 ((kernel_entry) LOADADDR)(reg_a0, reg_a1, reg_a2, reg_a3);
186 uart_write_str("failed\r\n");
190 /* *********************************************************************
192 * ADM5120 UART driver File: dev_adm_uart.c
194 * This is a console device driver for an ADM5120 UART
196 *********************************************************************
199 * Compex Systems. All rights reserved.
201 ********************************************************************* */
203 #define READCSR(r) *(volatile UInt32 *)(0xB2600000+(r))
204 #define WRITECSR(r,v) *(volatile UInt32 *)(0xB2600000+(r)) = v
206 #define UART_DR_REG 0x00
207 #define UART_FR_REG 0x18
208 #define UART_TX_FIFO_FULL 0x20
210 int uart_write(int val)
212 WRITECSR(UART_DR_REG, val);
213 while ( (READCSR(UART_FR_REG) & UART_TX_FIFO_FULL) );
217 int uart_write_str(char * str)
219 while ( *str != 0 ) {
220 uart_write ( *str++ );
225 int uart_write_hex(int val)
230 uart_write_str("0x");
231 for ( i=0 ; i<8 ; i++ ) {
232 tmp = (val >> ((7-i) * 4 )) & 0xf;
233 tmp = tmp < 10 ? (tmp + '0') : (tmp + 'A' - 10);
236 uart_write_str("\r\n");