aboutsummaryrefslogtreecommitdiff
path: root/drivers/io/io_fip.c
blob: d4771b5147598700a513e21b7d847f2e62f86094 (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
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
/*
 * Copyright (c) 2014-2018, ARM Limited and Contributors. All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

#include <assert.h>
#include <errno.h>
#include <stdint.h>
#include <string.h>

#include <platform_def.h>

#include <common/bl_common.h>
#include <common/debug.h>
#include <drivers/io/io_driver.h>
#include <drivers/io/io_fip.h>
#include <drivers/io/io_storage.h>
#include <lib/utils.h>
#include <plat/common/platform.h>
#include <tools_share/firmware_image_package.h>
#include <tools_share/uuid.h>

#ifndef MAX_FIP_DEVICES
#define MAX_FIP_DEVICES		1
#endif

/* Useful for printing UUIDs when debugging.*/
#define PRINT_UUID2(x)								\
	"%08x-%04hx-%04hx-%02hhx%02hhx-%02hhx%02hhx%02hhx%02hhx%02hhx%02hhx",	\
		x.time_low, x.time_mid, x.time_hi_and_version,			\
		x.clock_seq_hi_and_reserved, x.clock_seq_low,			\
		x.node[0], x.node[1], x.node[2], x.node[3],			\
		x.node[4], x.node[5]

typedef struct {
	unsigned int file_pos;
	fip_toc_entry_t entry;
} file_state_t;

/*
 * Maintain dev_spec per FIP Device
 * TODO - Add backend handles and file state
 * per FIP device here once backends like io_memmap
 * can support multiple open files
 */
typedef struct {
	uintptr_t dev_spec;
} fip_dev_state_t;

static const uuid_t uuid_null = { {0} };
/*
 * Only one file can be open across all FIP device
 * as backends like io_memmap don't support
 * multiple open files. The file state and
 * backend handle should be maintained per FIP device
 * if the same support is available in the backend
 */
static file_state_t current_file = {0};
static uintptr_t backend_dev_handle;
static uintptr_t backend_image_spec;

static fip_dev_state_t state_pool[MAX_FIP_DEVICES];
static io_dev_info_t dev_info_pool[MAX_FIP_DEVICES];

/* Track number of allocated fip devices */
static unsigned int fip_dev_count;

/* Firmware Image Package driver functions */
static int fip_dev_open(const uintptr_t dev_spec, io_dev_info_t **dev_info);
static int fip_file_open(io_dev_info_t *dev_info, const uintptr_t spec,
			  io_entity_t *entity);
static int fip_file_len(io_entity_t *entity, size_t *length);
static int fip_file_read(io_entity_t *entity, uintptr_t buffer, size_t length,
			  size_t *length_read);
static int fip_file_close(io_entity_t *entity);
static int fip_dev_init(io_dev_info_t *dev_info, const uintptr_t init_params);
static int fip_dev_close(io_dev_info_t *dev_info);


/* Return 0 for equal uuids. */
static inline int compare_uuids(const uuid_t *uuid1, const uuid_t *uuid2)
{
	return memcmp(uuid1, uuid2, sizeof(uuid_t));
}


/* TODO: We could check version numbers or do a package checksum? */
static inline int is_valid_header(fip_toc_header_t *header)
{
	if ((header->name == TOC_HEADER_NAME) && (header->serial_number != 0)) {
		return 1;
	} else {
		return 0;
	}
}


/* Identify the device type as a virtual driver */
static io_type_t device_type_fip(void)
{
	return IO_TYPE_FIRMWARE_IMAGE_PACKAGE;
}


static const io_dev_connector_t fip_dev_connector = {
	.dev_open = fip_dev_open
};


static const io_dev_funcs_t fip_dev_funcs = {
	.type = device_type_fip,
	.open = fip_file_open,
	.seek = NULL,
	.size = fip_file_len,
	.read = fip_file_read,
	.write = NULL,
	.close = fip_file_close,
	.dev_init = fip_dev_init,
	.dev_close = fip_dev_close,
};

/* Locate a file state in the pool, specified by address */
static int find_first_fip_state(const uintptr_t dev_spec,
				  unsigned int *index_out)
{
	int result = -ENOENT;
	unsigned int index;

	for (index = 0; index < (unsigned int)MAX_FIP_DEVICES; ++index) {
		/* dev_spec is used as identifier since it's unique */
		if (state_pool[index].dev_spec == dev_spec) {
			result = 0;
			*index_out = index;
			break;
		}
	}
	return result;
}


/* Allocate a device info from the pool and return a pointer to it */
static int allocate_dev_info(io_dev_info_t **dev_info)
{
	int result = -ENOMEM;

	assert(dev_info != NULL);

	if (fip_dev_count < (unsigned int)MAX_FIP_DEVICES) {
		unsigned int index = 0;

		result = find_first_fip_state(0, &index);
		assert(result == 0);
		/* initialize dev_info */
		dev_info_pool[index].funcs = &fip_dev_funcs;
		dev_info_pool[index].info =
				(uintptr_t)&state_pool[index];
		*dev_info = &dev_info_pool[index];
		++fip_dev_count;
	}

	return result;
}

/* Release a device info to the pool */
static int free_dev_info(io_dev_info_t *dev_info)
{
	int result;
	unsigned int index = 0;
	fip_dev_state_t *state;

	assert(dev_info != NULL);

	state = (fip_dev_state_t *)dev_info->info;
	result = find_first_fip_state(state->dev_spec, &index);
	if (result ==  0) {
		/* free if device info is valid */
		zeromem(state, sizeof(fip_dev_state_t));
		--fip_dev_count;
	}

	return result;
}

/*
 * Multiple FIP devices can be opened depending on the value of
 * MAX_FIP_DEVICES. Given that there is only one backend, only a
 * single file can be open at a time by any FIP device.
 */
static int fip_dev_open(const uintptr_t dev_spec,
			 io_dev_info_t **dev_info)
{
	int result;
	io_dev_info_t *info;
	fip_dev_state_t *state;

	assert(dev_info != NULL);
#if MAX_FIP_DEVICES > 1
	assert(dev_spec != (uintptr_t)NULL);
#endif

	result = allocate_dev_info(&info);
	if (result != 0)
		return -ENOMEM;

	state = (fip_dev_state_t *)info->info;

	state->dev_spec = dev_spec;

	*dev_info = info;

	return 0;
}


/* Do some basic package checks. */
static int fip_dev_init(io_dev_info_t *dev_info, const uintptr_t init_params)
{
	int result;
	unsigned int image_id = (unsigned int)init_params;
	uintptr_t backend_handle;
	fip_toc_header_t header;
	size_t bytes_read;

	/* Obtain a reference to the image by querying the platform layer */
	result = plat_get_image_source(image_id, &backend_dev_handle,
				       &backend_image_spec);
	if (result != 0) {
		WARN("Failed to obtain reference to image id=%u (%i)\n",
			image_id, result);
		result = -ENOENT;
		goto fip_dev_init_exit;
	}

	/* Attempt to access the FIP image */
	result = io_open(backend_dev_handle, backend_image_spec,
			 &backend_handle);
	if (result != 0) {
		WARN("Failed to access image id=%u (%i)\n", image_id, result);
		result = -ENOENT;
		goto fip_dev_init_exit;
	}

	result = io_read(backend_handle, (uintptr_t)&header, sizeof(header),
			&bytes_read);
	if (result == 0) {
		if (!is_valid_header(&header)) {
			WARN("Firmware Image Package header check failed.\n");
			result = -ENOENT;
		} else {
			VERBOSE("FIP header looks OK.\n");
		}
	}

	io_close(backend_handle);

 fip_dev_init_exit:
	return result;
}

/* Close a connection to the FIP device */
static int fip_dev_close(io_dev_info_t *dev_info)
{
	/* TODO: Consider tracking open files and cleaning them up here */

	/* Clear the backend. */
	backend_dev_handle = (uintptr_t)NULL;
	backend_image_spec = (uintptr_t)NULL;

	return free_dev_info(dev_info);
}


/* Open a file for access from package. */
static int fip_file_open(io_dev_info_t *dev_info, const uintptr_t spec,
			 io_entity_t *entity)
{
	int result;
	uintptr_t backend_handle;
	const io_uuid_spec_t *uuid_spec = (io_uuid_spec_t *)spec;
	size_t bytes_read;
	int found_file = 0;

	assert(uuid_spec != NULL);
	assert(entity != NULL);

	/* Can only have one file open at a time for the moment. We need to
	 * track state like file cursor position. We know the header lives at
	 * offset zero, so this entry should never be zero for an active file.
	 * When the system supports dynamic memory allocation we can allow more
	 * than one open file at a time if needed.
	 */
	if (current_file.entry.offset_address != 0) {
		WARN("fip_file_open : Only one open file at a time.\n");
		return -ENOMEM;
	}

	/* Attempt to access the FIP image */
	result = io_open(backend_dev_handle, backend_image_spec,
			 &backend_handle);
	if (result != 0) {
		WARN("Failed to open Firmware Image Package (%i)\n", result);
		result = -ENOENT;
		goto fip_file_open_exit;
	}

	/* Seek past the FIP header into the Table of Contents */
	result = io_seek(backend_handle, IO_SEEK_SET, sizeof(fip_toc_header_t));
	if (result != 0) {
		WARN("fip_file_open: failed to seek\n");
		result = -ENOENT;
		goto fip_file_open_close;
	}

	found_file = 0;
	do {
		result = io_read(backend_handle,
				 (uintptr_t)&current_file.entry,
				 sizeof(current_file.entry),
				 &bytes_read);
		if (result == 0) {
			if (compare_uuids(&current_file.entry.uuid,
					  &uuid_spec->uuid) == 0) {
				found_file = 1;
				break;
			}
		} else {
			WARN("Failed to read FIP (%i)\n", result);
			goto fip_file_open_close;
		}
	} while (compare_uuids(&current_file.entry.uuid, &uuid_null) != 0);

	if (found_file == 1) {
		/* All fine. Update entity info with file state and return. Set
		 * the file position to 0. The 'current_file.entry' holds the
		 * base and size of the file.
		 */
		current_file.file_pos = 0;
		entity->info = (uintptr_t)&current_file;
	} else {
		/* Did not find the file in the FIP. */
		current_file.entry.offset_address = 0;
		result = -ENOENT;
	}

 fip_file_open_close:
	io_close(backend_handle);

 fip_file_open_exit:
	return result;
}


/* Return the size of a file in package */
static int fip_file_len(io_entity_t *entity, size_t *length)
{
	assert(entity != NULL);
	assert(length != NULL);

	*length =  ((file_state_t *)entity->info)->entry.size;

	return 0;
}


/* Read data from a file in package */
static int fip_file_read(io_entity_t *entity, uintptr_t buffer, size_t length,
			  size_t *length_read)
{
	int result;
	file_state_t *fp;
	size_t file_offset;
	size_t bytes_read;
	uintptr_t backend_handle;

	assert(entity != NULL);
	assert(length_read != NULL);
	assert(entity->info != (uintptr_t)NULL);

	/* Open the backend, attempt to access the blob image */
	result = io_open(backend_dev_handle, backend_image_spec,
			 &backend_handle);
	if (result != 0) {
		WARN("Failed to open FIP (%i)\n", result);
		result = -ENOENT;
		goto fip_file_read_exit;
	}

	fp = (file_state_t *)entity->info;

	/* Seek to the position in the FIP where the payload lives */
	file_offset = fp->entry.offset_address + fp->file_pos;
	result = io_seek(backend_handle, IO_SEEK_SET, file_offset);
	if (result != 0) {
		WARN("fip_file_read: failed to seek\n");
		result = -ENOENT;
		goto fip_file_read_close;
	}

	result = io_read(backend_handle, buffer, length, &bytes_read);
	if (result != 0) {
		/* We cannot read our data. Fail. */
		WARN("Failed to read payload (%i)\n", result);
		result = -ENOENT;
		goto fip_file_read_close;
	} else {
		/* Set caller length and new file position. */
		*length_read = bytes_read;
		fp->file_pos += bytes_read;
	}

/* Close the backend. */
 fip_file_read_close:
	io_close(backend_handle);

 fip_file_read_exit:
	return result;
}


/* Close a file in package */
static int fip_file_close(io_entity_t *entity)
{
	/* Clear our current file pointer.
	 * If we had malloc() we would free() here.
	 */
	if (current_file.entry.offset_address != 0) {
		zeromem(&current_file, sizeof(current_file));
	}

	/* Clear the Entity info. */
	entity->info = 0;

	return 0;
}

/* Exported functions */

/* Register the Firmware Image Package driver with the IO abstraction */
int register_io_dev_fip(const io_dev_connector_t **dev_con)
{
	int result;
	assert(dev_con != NULL);

	/*
	 * Since dev_info isn't really used in io_register_device, always
	 * use the same device info at here instead.
	 */
	result = io_register_device(&dev_info_pool[0]);
	if (result == 0)
		*dev_con = &fip_dev_connector;

	return result;
}