summaryrefslogtreecommitdiff
path: root/src/lib/cbfs.c
blob: 390e7796e80911f144942396891d9bfc81d9db6d (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
242
243
244
245
246
247
248
249
/*
 * This file is part of the coreboot project.
 *
 * Copyright (C) 2008, Jordan Crouse <jordan@cosmicpenguin.net>
 *
 * 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; version 2 of the License.
 *
 * 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., 51 Franklin St, Fifth Floor, Boston, MA, 02110-1301 USA
 */

#include <types.h>
#include <string.h>
#include <console/console.h>
#include <cbfs.h>
#include <lib.h>
#include <arch/byteorder.h>


/**
 * Decompression wrapper for CBFS
 * @param algo
 * @param src
 * @param dst
 * @param len
 * @return 0 on success, -1 on failure
 */
static int cbfs_decompress(int algo, void *src, void *dst, int len)
{
	switch(algo) {
	case CBFS_COMPRESS_NONE:
		memcpy(dst, src, len);
		return 0;

	case CBFS_COMPRESS_LZMA:
		if (!ulzma(src, dst)) {
			printk(BIOS_ERR, "CBFS: LZMA decompression failed!\n");
			return -1;
		}
		return 0;

	default:
		printk(BIOS_INFO,  "CBFS:  Unknown compression type %d\n", algo);
		return -1;
	}
}

static int cbfs_check_magic(struct cbfs_file *file)
{
	return !strcmp(file->magic, CBFS_FILE_MAGIC) ? 1 : 0;
}

static struct cbfs_header *cbfs_master_header(void)
{
	struct cbfs_header *header;

	void *ptr = (void *)*((unsigned long *) CBFS_HEADPTR_ADDR);
	printk(BIOS_SPEW, "Check CBFS header at %p\n", ptr);
	header = (struct cbfs_header *) ptr;

	printk(BIOS_SPEW, "magic is %08x\n", ntohl(header->magic));
	if (ntohl(header->magic) != CBFS_HEADER_MAGIC) {
		printk(BIOS_ERR, "ERROR: No valid CBFS header found!\n");
		if (header->magic == 0xffffffff) {
			printk(BIOS_ERR, "Maybe the ROM isn't entirely mapped yet?\n"
				"See (and report to) http://www.coreboot.org/Infrastructure_Projects#CBFS\n");
		}
		return NULL;
	}

	printk(BIOS_SPEW, "Found CBFS header at %p\n", ptr);
	return header;
}

struct cbfs_file *cbfs_find(const char *name)
{
	struct cbfs_header *header = cbfs_master_header();
	unsigned long offset;

	if (header == NULL)
		return NULL;
	offset = 0 - ntohl(header->romsize) + ntohl(header->offset);

	int align= ntohl(header->align);

	while(1) {
		struct cbfs_file *file = (struct cbfs_file *) offset;
		if (!cbfs_check_magic(file)) return NULL;
		printk(BIOS_SPEW, "Check %s\n", CBFS_NAME(file));
		if (!strcmp(CBFS_NAME(file), name))
			return file;

		int flen = ntohl(file->len);
		int foffset = ntohl(file->offset);
		printk(BIOS_SPEW, "CBFS: follow chain: %p + %x + %x + align -> ", (void *)offset, foffset, flen);

		unsigned long oldoffset = offset;
		offset = ALIGN(offset + foffset + flen, align);
		printk(BIOS_SPEW, "%p\n", (void *)offset);
		if (offset <= oldoffset) return NULL;

		if (offset < 0xFFFFFFFF - ntohl(header->romsize))
			return NULL;
	}
}

void *cbfs_find_file(const char *name, int type)
{
	struct cbfs_file *file = cbfs_find(name);

	if (file == NULL) {
		printk(BIOS_INFO,  "CBFS:  Could not find file %s\n",
		       name);
		return NULL;
	}

	if (ntohl(file->type) != type) {
		printk(BIOS_INFO,  "CBFS:  File %s is of type %x instead of"
		       "type %x\n", name, file->type, type);

		return NULL;
	}

	return (void *) CBFS_SUBHEADER(file);
}

static inline int tohex4(unsigned int c)
{
	return (c<=9)?(c+'0'):(c-10+'a');
}

static void tohex16(unsigned int val, char* dest)
{
	dest[0]=tohex4(val>>12);
	dest[1]=tohex4((val>>8) & 0xf);
	dest[2]=tohex4((val>>4) & 0xf);
	dest[3]=tohex4(val & 0xf);
}

void *cbfs_load_optionrom(u16 vendor, u16 device, void * dest)
{
	char name[17]="pciXXXX,XXXX.rom";
	struct cbfs_optionrom *orom;
	u8 *src;

	tohex16(vendor, name+3);
	tohex16(device, name+8);

	orom = (struct cbfs_optionrom *)
		cbfs_find_file(name, CBFS_TYPE_OPTIONROM);

	if (orom == NULL)
		return NULL;

	/* They might have specified a dest address. If so, we can decompress. 
	 * If not, there's not much hope of decompressing or relocating the rom.
	 * in the common case, the expansion rom is uncompressed, we
	 * pass 0 in for the dest, and all we have to do is find the rom and 
	 * return a pointer to it. 
 	 */

	/* BUG: the cbfstool is (not yet) including a cbfs_optionrom header */
	src = ((unsigned char *) orom); // + sizeof(struct cbfs_optionrom);

	if (! dest)
		return src;

	if (cbfs_decompress(ntohl(orom->compression),
			     src,
			     dest,
			     ntohl(orom->len)))
		return NULL;

	return dest;
}

void * cbfs_load_stage(const char *name)
{
	struct cbfs_stage *stage = (struct cbfs_stage *)
		cbfs_find_file(name, CBFS_TYPE_STAGE);
	/* this is a mess. There is no ntohll. */
	/* for now, assume compatible byte order until we solve this. */
	u32 entry;

	if (stage == NULL)
		return (void *) -1;

	printk(BIOS_INFO, "Stage: loading %s @ 0x%x (%d bytes), entry @ 0x%llx\n", 
			name,
			(u32) stage->load, stage->memlen, 
			stage->entry);
	memset((void *) (u32) stage->load, 0, stage->memlen);

	if (cbfs_decompress(stage->compression,
			     ((unsigned char *) stage) +
			     sizeof(struct cbfs_stage),
			     (void *) (u32) stage->load,
			     stage->len))
		return (void *) -1;

	printk(BIOS_DEBUG, "Stage: done loading.\n");

	entry = stage->entry;
	// entry = ntohl((u32) stage->entry);

	return (void *) entry;
}

int cbfs_execute_stage(const char *name)
{
	struct cbfs_stage *stage = (struct cbfs_stage *)
		cbfs_find_file(name, CBFS_TYPE_STAGE);

	if (stage == NULL)
		return 1;

	if (ntohl(stage->compression) != CBFS_COMPRESS_NONE) {
		printk(BIOS_INFO,  "CBFS:  Unable to run %s:  Compressed file"
		       "Not supported for in-place execution\n", name);
		return 1;
	}

	/* FIXME: This isn't right */
	printk(BIOS_INFO,  "CBFS: run @ %p\n", (void *) ntohl((u32) stage->entry));
	return run_address((void *) ntohl((u32) stage->entry));
}

/**
 * run_address is passed the address of a function taking no parameters and
 * jumps to it, returning the result. 
 * @param f the address to call as a function. 
 * @return value returned by the function. 
 */

int run_address(void *f)
{
	int (*v) (void);
	v = f;
	return v();
}