summaryrefslogtreecommitdiffstats
path: root/layout.c
blob: f71eeaa8091e591e5225765112a4d7e24a78ccb3 (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
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
/*
 * This file is part of the flashrom project.
 *
 * Copyright (C) 2005-2008 coresystems GmbH
 * (Written by Stefan Reinauer <stepan@coresystems.de> for coresystems GmbH)
 * Copyright (C) 2011-2013 Stefan Tauner
 *
 * 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include "flash.h"
#include "programmer.h"

#define MAX_ROMLAYOUT	32

typedef struct {
	chipoff_t start;
	chipoff_t end;
	unsigned int included;
	char name[256];
} romentry_t;

/* rom_entries store the entries specified in a layout file and associated run-time data */
static romentry_t rom_entries[MAX_ROMLAYOUT];
static int num_rom_entries = 0; /* the number of successfully parsed rom_entries */

/* include_args holds the arguments specified at the command line with -i. They must be processed at some point
 * so that desired regions are marked as "included" in the rom_entries list. */
static char *include_args[MAX_ROMLAYOUT];
static int num_include_args = 0; /* the number of valid include_args. */

#ifndef __LIBPAYLOAD__
int read_romlayout(const char *name)
{
	FILE *romlayout;
	char tempstr[256];
	int i;

	romlayout = fopen(name, "r");

	if (!romlayout) {
		msg_gerr("ERROR: Could not open ROM layout (%s).\n",
			name);
		return -1;
	}

	while (!feof(romlayout)) {
		char *tstr1, *tstr2;

		if (num_rom_entries >= MAX_ROMLAYOUT) {
			msg_gerr("Maximum number of ROM images (%i) in layout "
				 "file reached.\n", MAX_ROMLAYOUT);
			(void)fclose(romlayout);
			return 1;
		}
		if (2 != fscanf(romlayout, "%255s %255s\n", tempstr, rom_entries[num_rom_entries].name))
			continue;
#if 0
		// fscanf does not like arbitrary comments like that :( later
		if (tempstr[0] == '#') {
			continue;
		}
#endif
		tstr1 = strtok(tempstr, ":");
		tstr2 = strtok(NULL, ":");
		if (!tstr1 || !tstr2) {
			msg_gerr("Error parsing layout file. Offending string: \"%s\"\n", tempstr);
			(void)fclose(romlayout);
			return 1;
		}
		rom_entries[num_rom_entries].start = strtol(tstr1, (char **)NULL, 16);
		rom_entries[num_rom_entries].end = strtol(tstr2, (char **)NULL, 16);
		rom_entries[num_rom_entries].included = 0;
		num_rom_entries++;
	}

	for (i = 0; i < num_rom_entries; i++) {
		msg_gdbg("romlayout %08x - %08x named %s\n",
			     rom_entries[i].start,
			     rom_entries[i].end, rom_entries[i].name);
	}

	(void)fclose(romlayout);

	return 0;
}
#endif

/* returns the index of the entry (or a negative value if it is not found) */
static int find_include_arg(const char *const name)
{
	unsigned int i;
	for (i = 0; i < num_include_args; i++) {
		if (!strcmp(include_args[i], name))
			return i;
	}
	return -1;
}

/* register an include argument (-i) for later processing */
int register_include_arg(char *name)
{
	if (num_include_args >= MAX_ROMLAYOUT) {
		msg_gerr("Too many regions included (%i).\n", num_include_args);
		return 1;
	}

	if (name == NULL) {
		msg_gerr("<NULL> is a bad region name.\n");
		return 1;
	}

	if (find_include_arg(name) != -1) {
		msg_gerr("Duplicate region name: \"%s\".\n", name);
		return 1;
	}

	include_args[num_include_args] = name;
	num_include_args++;
	return 0;
}

/* returns the index of the entry (or a negative value if it is not found) */
static int find_romentry(char *name)
{
	int i;

	if (num_rom_entries == 0)
		return -1;

	msg_gspew("Looking for region \"%s\"... ", name);
	for (i = 0; i < num_rom_entries; i++) {
		if (!strcmp(rom_entries[i].name, name)) {
			rom_entries[i].included = 1;
			msg_gspew("found.\n");
			return i;
		}
	}
	msg_gspew("not found.\n");
	return -1;
}

/* process -i arguments
 * returns 0 to indicate success, >0 to indicate failure
 */
int process_include_args(void)
{
	int i;
	unsigned int found = 0;

	if (num_include_args == 0)
		return 0;

	/* User has specified an area, but no layout file is loaded. */
	if (num_rom_entries == 0) {
		msg_gerr("Region requested (with -i \"%s\"), "
			 "but no layout data is available.\n",
			 include_args[0]);
		return 1;
	}

	for (i = 0; i < num_include_args; i++) {
		if (find_romentry(include_args[i]) < 0) {
			msg_gerr("Invalid region specified: \"%s\".\n",
				 include_args[i]);
			return 1;
		}
		found++;
	}

	msg_ginfo("Using region%s: \"%s\"", num_include_args > 1 ? "s" : "",
		  include_args[0]);
	for (i = 1; i < num_include_args; i++)
		msg_ginfo(", \"%s\"", include_args[i]);
	msg_ginfo(".\n");
	return 0;
}

void layout_cleanup(void)
{
	int i;
	for (i = 0; i < num_include_args; i++) {
		free(include_args[i]);
		include_args[i] = NULL;
	}
	num_include_args = 0;

	for (i = 0; i < num_rom_entries; i++) {
		rom_entries[i].included = 0;
	}
	num_rom_entries = 0;
}

romentry_t *get_next_included_romentry(unsigned int start)
{
	int i;
	unsigned int best_start = UINT_MAX;
	romentry_t *best_entry = NULL;
	romentry_t *cur;

	/* First come, first serve for overlapping regions. */
	for (i = 0; i < num_rom_entries; i++) {
		cur = &rom_entries[i];
		if (!cur->included)
			continue;
		/* Already past the current entry? */
		if (start > cur->end)
			continue;
		/* Inside the current entry? */
		if (start >= cur->start)
			return cur;
		/* Entry begins after start. */
		if (best_start > cur->start) {
			best_start = cur->start;
			best_entry = cur;
		}
	}
	return best_entry;
}

/* Validate and - if needed - normalize layout entries. */
int normalize_romentries(const struct flashctx *flash)
{
	chipsize_t total_size = flash->chip->total_size * 1024;
	int ret = 0;

	int i;
	for (i = 0; i < num_rom_entries; i++) {
		if (rom_entries[i].start >= total_size || rom_entries[i].end >= total_size) {
			msg_gwarn("Warning: Address range of region \"%s\" exceeds the current chip's "
				  "address space.\n", rom_entries[i].name);
			if (rom_entries[i].included)
				ret = 1;
		}
		if (rom_entries[i].start > rom_entries[i].end) {
			msg_gerr("Error: Size of the address range of region \"%s\" is not positive.\n",
				  rom_entries[i].name);
			ret = 1;
		}
	}

	return ret;
}

static int copy_old_content(struct flashctx *flash, int oldcontents_valid, uint8_t *oldcontents, uint8_t *newcontents, unsigned int start, unsigned int size)
{
	if (!oldcontents_valid) {
		/* oldcontents is a zero-filled buffer. By reading the current data into oldcontents here, we
		 * avoid a rewrite of identical regions even if an initial full chip read didn't happen. */
		msg_gdbg2("Read a chunk starting at 0x%06x (len=0x%06x).\n", start, size);
		int ret = flash->chip->read(flash, oldcontents + start, start, size);
		if (ret != 0) {
			msg_gerr("Failed to read chunk 0x%06x-0x%06x.\n", start, start + size - 1);
			return 1;
		}
	}
	memcpy(newcontents + start, oldcontents + start, size);
	return 0;
}

/**
 * Modify @newcontents so that it contains the data that should be on the chip eventually. In the case the user
 * wants to update only parts of it, copy the chunks to be preserved from @oldcontents to @newcontents. If
 * @oldcontents is not valid, we need to fetch the current data from the chip first.
 */
int build_new_image(struct flashctx *flash, bool oldcontents_valid, uint8_t *oldcontents, uint8_t *newcontents)
{
	unsigned int start = 0;
	romentry_t *entry;
	unsigned int size = flash->chip->total_size * 1024;

	/* If no regions were specified for inclusion, assume
	 * that the user wants to write the complete new image.
	 */
	if (num_include_args == 0)
		return 0;

	/* Non-included romentries are ignored.
	 * The union of all included romentries is used from the new image.
	 */
	while (start < size) {
		entry = get_next_included_romentry(start);
		/* No more romentries for remaining region? */
		if (!entry) {
			copy_old_content(flash, oldcontents_valid, oldcontents, newcontents, start,
					 size - start);
			break;
		}
		/* For non-included region, copy from old content. */
		if (entry->start > start)
			copy_old_content(flash, oldcontents_valid, oldcontents, newcontents, start,
					 entry->start - start);
		/* Skip to location after current romentry. */
		start = entry->end + 1;
		/* Catch overflow. */
		if (!start)
			break;
	}
	return 0;
}
OpenPOWER on IntegriCloud