summaryrefslogtreecommitdiffstats
path: root/target/linux/adm5120-2.6/image/lzma-loader/src/decompress.c
blob: ec63ccb65165c32352211a3c4ff1abdc7ccf3173 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
/*
 * LZMA compressed kernel decompressor for bcm947xx boards
 *
 * Copyright (C) 2005 by Oleg I. Vdovikin <oleg@cs.msu.su>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 *
 * Please note, this was code based on the bunzip2 decompressor code
 * by Manuel Novoa III  (mjn3@codepoet.org), although the only thing left
 * is an idea and part of original vendor code
 *
 *
 * 12-Mar-2005  Mineharu Takahara <mtakahar@yahoo.com>
 *   pass actual output size to decoder (stream mode
 *   compressed input is not a requirement anymore)
 *
 * 24-Apr-2005 Oleg I. Vdovikin
 *   reordered functions using lds script, removed forward decl
 *
 * 24-Mar-2007 Gabor Juhos
 *   pass original values of the a0,a1,a2,a3 registers to the kernel
 *
 */

#include "LzmaDecode.h"

#define BCM4710_FLASH		0x1fc00000	/* Flash */

#define KSEG0			0x80000000
#define KSEG1			0xa0000000

#define KSEG1ADDR(a)		((((unsigned)(a)) & 0x1fffffffU) | KSEG1)

#define Index_Invalidate_I	0x00
#define Index_Writeback_Inv_D   0x01

#define cache_unroll(base,op)	\
	__asm__ __volatile__(		\
		".set noreorder;\n"		\
		".set mips3;\n"			\
		"cache %1, (%0);\n"		\
		".set mips0;\n"			\
		".set reorder\n"		\
		:						\
		: "r" (base),			\
		  "i" (op));

static __inline__ void blast_icache(unsigned long size, unsigned long lsize)
{
	unsigned long start = KSEG0;
	unsigned long end = (start + size);

	while(start < end) {
		cache_unroll(start,Index_Invalidate_I);
		start += lsize;
	}
}

static __inline__ void blast_dcache(unsigned long size, unsigned long lsize)
{
	unsigned long start = KSEG0;
	unsigned long end = (start + size);

	while(start < end) {
		cache_unroll(start,Index_Writeback_Inv_D);
		start += lsize;
	}
}

#define TRX_MAGIC       0x30524448      /* "HDR0" */

struct trx_header {
	unsigned int magic;		/* "HDR0" */
	unsigned int len;		/* Length of file including header */
	unsigned int crc32;		/* 32-bit CRC from flag_version to end of file */
	unsigned int flag_version;	/* 0:15 flags, 16:31 version */
	unsigned int offsets[3];	/* Offsets of partitions from start of header */
};

/* beyound the image end, size not known in advance */
extern unsigned char workspace[];

unsigned int offset;
unsigned char *data;

typedef void (*kernel_entry)(unsigned long reg_a0, unsigned long reg_a1,
	unsigned long reg_a2, unsigned long reg_a3);

/* flash access should be aligned, so wrapper is used */
/* read byte from the flash, all accesses are 32-bit aligned */
static int read_byte(void *object, unsigned char **buffer, UInt32 *bufferSize)
{
	static unsigned int val;

	if (((unsigned int)offset % 4) == 0) {
		val = *(unsigned int *)data;
		data += 4;
	}

	*bufferSize = 1;
	*buffer = ((unsigned char *)&val) + (offset++ & 3);

	return LZMA_RESULT_OK;
}

static __inline__ unsigned char get_byte(void)
{
	unsigned char *buffer;
	UInt32 fake;

	return read_byte(0, &buffer, &fake), *buffer;
}

int uart_write_str(char * str);

/* should be the first function */
void decompress_entry(unsigned long reg_a0, unsigned long reg_a1,
	unsigned long reg_a2, unsigned long reg_a3,
	unsigned long icache_size, unsigned long icache_lsize,
	unsigned long dcache_size, unsigned long dcache_lsize)
{
	unsigned int i;  /* temp value */
	unsigned int lc; /* literal context bits */
	unsigned int lp; /* literal pos state bits */
	unsigned int pb; /* pos state bits */
	unsigned int osize; /* uncompressed size */

	ILzmaInCallback callback;
	callback.Read = read_byte;

    uart_write_str("decompress kernel ... ");

	/* look for trx header, 32-bit data access */
	for (data = ((unsigned char *) KSEG1ADDR(BCM4710_FLASH));
		((struct trx_header *)data)->magic != TRX_MAGIC; data += 65536);

	/* compressed kernel is in the partition 0 or 1 */
	if (((struct trx_header *)data)->offsets[1] > 65536)
		data += ((struct trx_header *)data)->offsets[0];
	else
		data += ((struct trx_header *)data)->offsets[1];

	offset = 0;

	/* lzma args */
	i = get_byte();
	lc = i % 9, i = i / 9;
	lp = i % 5, pb = i / 5;

	/* skip rest of the LZMA coder property */
	for (i = 0; i < 4; i++)
		get_byte();

	/* read the lower half of uncompressed size in the header */
	osize = ((unsigned int)get_byte()) +
		((unsigned int)get_byte() << 8) +
		((unsigned int)get_byte() << 16) +
		((unsigned int)get_byte() << 24);

	/* skip rest of the header (upper half of uncompressed size) */
	for (i = 0; i < 4; i++)
		get_byte();

	/* decompress kernel */
	if (LzmaDecode(workspace, ~0, lc, lp, pb, &callback,
		(unsigned char*)LOADADDR, osize, &i) == LZMA_RESULT_OK)
	{
		blast_dcache(dcache_size, dcache_lsize);
		blast_icache(icache_size, icache_lsize);

		/* Jump to load address */
        uart_write_str("ok\r\n");
		((kernel_entry) LOADADDR)(reg_a0, reg_a1, reg_a2, reg_a3);
	}
    uart_write_str("failed\r\n");
    while (1 );
}

/*  *********************************************************************
    *
    *  ADM5120 UART driver			File: dev_adm_uart.c
    *
    *  This is a console device driver for an ADM5120 UART
    *
    *********************************************************************
    *
    *  Copyright 2006
    *  Compex Systems. All rights reserved.
    *
    ********************************************************************* */

#define READCSR(r)      *(volatile UInt32 *)(0xB2600000+(r))
#define WRITECSR(r,v)   *(volatile UInt32 *)(0xB2600000+(r)) = v

#define UART_DR_REG         0x00
#define UART_FR_REG         0x18
#define UART_TX_FIFO_FULL   0x20

int uart_write(int val)
{
	WRITECSR(UART_DR_REG, val);
    while ( (READCSR(UART_FR_REG) & UART_TX_FIFO_FULL) );
    return 0;
}

int uart_write_str(char * str)
{
    while ( *str != 0 ) {
        uart_write ( *str++ );
    }
    return 0;
}

int uart_write_hex(int val)
{
    int i;
    int tmp;

    uart_write_str("0x");
    for ( i=0 ; i<8 ; i++ ) {
        tmp = (val >> ((7-i) * 4 )) & 0xf;
        tmp = tmp < 10 ? (tmp + '0') : (tmp + 'A' - 10);
        uart_write(tmp);
    }
    uart_write_str("\r\n");
    return 0;
}