summaryrefslogtreecommitdiff
path: root/lib/efi_loader/efi_disk.c
blob: c434c92250aea21b78384a70d23a680607595374 (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
/*
 *  EFI application disk support
 *
 *  Copyright (c) 2016 Alexander Graf
 *
 *  SPDX-License-Identifier:     GPL-2.0+
 */

#include <common.h>
#include <blk.h>
#include <dm.h>
#include <efi_loader.h>
#include <inttypes.h>
#include <part.h>
#include <malloc.h>

static const efi_guid_t efi_block_io_guid = BLOCK_IO_GUID;

struct efi_disk_obj {
	/* Generic EFI object parent class data */
	struct efi_object parent;
	/* EFI Interface callback struct for block I/O */
	struct efi_block_io ops;
	/* U-Boot ifname for block device */
	const char *ifname;
	/* U-Boot dev_index for block device */
	int dev_index;
	/* EFI Interface Media descriptor struct, referenced by ops */
	struct efi_block_io_media media;
	/* EFI device path to this block device */
	struct efi_device_path_file_path *dp;
	/* Offset into disk for simple partitions */
	lbaint_t offset;
};

static efi_status_t efi_disk_open_block(void *handle, efi_guid_t *protocol,
			void **protocol_interface, void *agent_handle,
			void *controller_handle, uint32_t attributes)
{
	struct efi_disk_obj *diskobj = handle;

	*protocol_interface = &diskobj->ops;

	return EFI_SUCCESS;
}

static efi_status_t efi_disk_open_dp(void *handle, efi_guid_t *protocol,
			void **protocol_interface, void *agent_handle,
			void *controller_handle, uint32_t attributes)
{
	struct efi_disk_obj *diskobj = handle;

	*protocol_interface = diskobj->dp;

	return EFI_SUCCESS;
}

static efi_status_t EFIAPI efi_disk_reset(struct efi_block_io *this,
			char extended_verification)
{
	EFI_ENTRY("%p, %x", this, extended_verification);
	return EFI_EXIT(EFI_DEVICE_ERROR);
}

enum efi_disk_direction {
	EFI_DISK_READ,
	EFI_DISK_WRITE,
};

static efi_status_t EFIAPI efi_disk_rw_blocks(struct efi_block_io *this,
			u32 media_id, u64 lba, unsigned long buffer_size,
			void *buffer, enum efi_disk_direction direction)
{
	struct efi_disk_obj *diskobj;
	struct blk_desc *desc;
	int blksz;
	int blocks;
	unsigned long n;

	diskobj = container_of(this, struct efi_disk_obj, ops);
	if (!(desc = blk_get_dev(diskobj->ifname, diskobj->dev_index)))
		return EFI_EXIT(EFI_DEVICE_ERROR);
	blksz = desc->blksz;
	blocks = buffer_size / blksz;
	lba += diskobj->offset;

	debug("EFI: %s:%d blocks=%x lba=%"PRIx64" blksz=%x dir=%d\n", __func__,
	      __LINE__, blocks, lba, blksz, direction);

	/* We only support full block access */
	if (buffer_size & (blksz - 1))
		return EFI_EXIT(EFI_DEVICE_ERROR);

	if (direction == EFI_DISK_READ)
		n = blk_dread(desc, lba, blocks, buffer);
	else
		n = blk_dwrite(desc, lba, blocks, buffer);

	/* We don't do interrupts, so check for timers cooperatively */
	efi_timer_check();

	debug("EFI: %s:%d n=%lx blocks=%x\n", __func__, __LINE__, n, blocks);

	if (n != blocks)
		return EFI_EXIT(EFI_DEVICE_ERROR);

	return EFI_EXIT(EFI_SUCCESS);
}

static efi_status_t efi_disk_read_blocks(struct efi_block_io *this,
			u32 media_id, u64 lba, unsigned long buffer_size,
			void *buffer)
{
	void *real_buffer = buffer;
	efi_status_t r;

#ifdef CONFIG_EFI_LOADER_BOUNCE_BUFFER
	if (buffer_size > EFI_LOADER_BOUNCE_BUFFER_SIZE) {
		r = efi_disk_read_blocks(this, media_id, lba,
			EFI_LOADER_BOUNCE_BUFFER_SIZE, buffer);
		if (r != EFI_SUCCESS)
			return r;
		return efi_disk_read_blocks(this, media_id, lba +
			EFI_LOADER_BOUNCE_BUFFER_SIZE / this->media->block_size,
			buffer_size - EFI_LOADER_BOUNCE_BUFFER_SIZE,
			buffer + EFI_LOADER_BOUNCE_BUFFER_SIZE);
	}

	real_buffer = efi_bounce_buffer;
#endif

	EFI_ENTRY("%p, %x, %"PRIx64", %lx, %p", this, media_id, lba,
		  buffer_size, buffer);

	r = efi_disk_rw_blocks(this, media_id, lba, buffer_size, real_buffer,
			       EFI_DISK_READ);

	/* Copy from bounce buffer to real buffer if necessary */
	if ((r == EFI_SUCCESS) && (real_buffer != buffer))
		memcpy(buffer, real_buffer, buffer_size);

	return EFI_EXIT(r);
}

static efi_status_t efi_disk_write_blocks(struct efi_block_io *this,
			u32 media_id, u64 lba, unsigned long buffer_size,
			void *buffer)
{
	void *real_buffer = buffer;
	efi_status_t r;

#ifdef CONFIG_EFI_LOADER_BOUNCE_BUFFER
	if (buffer_size > EFI_LOADER_BOUNCE_BUFFER_SIZE) {
		r = efi_disk_write_blocks(this, media_id, lba,
			EFI_LOADER_BOUNCE_BUFFER_SIZE, buffer);
		if (r != EFI_SUCCESS)
			return r;
		return efi_disk_write_blocks(this, media_id, lba +
			EFI_LOADER_BOUNCE_BUFFER_SIZE / this->media->block_size,
			buffer_size - EFI_LOADER_BOUNCE_BUFFER_SIZE,
			buffer + EFI_LOADER_BOUNCE_BUFFER_SIZE);
	}

	real_buffer = efi_bounce_buffer;
#endif

	EFI_ENTRY("%p, %x, %"PRIx64", %lx, %p", this, media_id, lba,
		  buffer_size, buffer);

	/* Populate bounce buffer if necessary */
	if (real_buffer != buffer)
		memcpy(real_buffer, buffer, buffer_size);

	r = efi_disk_rw_blocks(this, media_id, lba, buffer_size, real_buffer,
			       EFI_DISK_WRITE);

	return EFI_EXIT(r);
}

static efi_status_t EFIAPI efi_disk_flush_blocks(struct efi_block_io *this)
{
	/* We always write synchronously */
	EFI_ENTRY("%p", this);
	return EFI_EXIT(EFI_SUCCESS);
}

static const struct efi_block_io block_io_disk_template = {
	.reset = &efi_disk_reset,
	.read_blocks = &efi_disk_read_blocks,
	.write_blocks = &efi_disk_write_blocks,
	.flush_blocks = &efi_disk_flush_blocks,
};

static void efi_disk_add_dev(const char *name,
			     const char *if_typename,
			     const struct blk_desc *desc,
			     int dev_index,
			     lbaint_t offset)
{
	struct efi_disk_obj *diskobj;
	struct efi_device_path_file_path *dp;
	int objlen = sizeof(*diskobj) + (sizeof(*dp) * 2);

	diskobj = calloc(1, objlen);

	/* Fill in object data */
	diskobj->parent.protocols[0].guid = &efi_block_io_guid;
	diskobj->parent.protocols[0].open = efi_disk_open_block;
	diskobj->parent.protocols[1].guid = &efi_guid_device_path;
	diskobj->parent.protocols[1].open = efi_disk_open_dp;
	diskobj->parent.handle = diskobj;
	diskobj->ops = block_io_disk_template;
	diskobj->ifname = if_typename;
	diskobj->dev_index = dev_index;
	diskobj->offset = offset;

	/* Fill in EFI IO Media info (for read/write callbacks) */
	diskobj->media.removable_media = desc->removable;
	diskobj->media.media_present = 1;
	diskobj->media.block_size = desc->blksz;
	diskobj->media.io_align = desc->blksz;
	diskobj->media.last_block = desc->lba;
	diskobj->ops.media = &diskobj->media;

	/* Fill in device path */
	dp = (void*)&diskobj[1];
	diskobj->dp = dp;
	dp[0].dp.type = DEVICE_PATH_TYPE_MEDIA_DEVICE;
	dp[0].dp.sub_type = DEVICE_PATH_SUB_TYPE_FILE_PATH;
	dp[0].dp.length = sizeof(*dp);
	ascii2unicode(dp[0].str, name);

	dp[1].dp.type = DEVICE_PATH_TYPE_END;
	dp[1].dp.sub_type = DEVICE_PATH_SUB_TYPE_END;
	dp[1].dp.length = sizeof(*dp);

	/* Hook up to the device list */
	list_add_tail(&diskobj->parent.link, &efi_obj_list);
}

static int efi_disk_create_eltorito(struct blk_desc *desc,
				    const char *if_typename,
				    int diskid)
{
	int disks = 0;
#ifdef CONFIG_ISO_PARTITION
	char devname[32] = { 0 }; /* dp->str is u16[32] long */
	disk_partition_t info;
	int part = 1;

	if (desc->part_type != PART_TYPE_ISO)
		return 0;

	while (!part_get_info(desc, part, &info)) {
		snprintf(devname, sizeof(devname), "%s%d:%d", if_typename,
			 diskid, part);
		efi_disk_add_dev(devname, if_typename, desc, diskid,
				 info.start);
		part++;
		disks++;
	}
#endif

	return disks;
}

/*
 * U-Boot doesn't have a list of all online disk devices. So when running our
 * EFI payload, we scan through all of the potentially available ones and
 * store them in our object pool.
 *
 * TODO(sjg@chromium.org): Actually with CONFIG_BLK, U-Boot does have this.
 * Consider converting the code to look up devices as needed. The EFI device
 * could be a child of the UCLASS_BLK block device, perhaps.
 *
 * This gets called from do_bootefi_exec().
 */
int efi_disk_register(void)
{
	int disks = 0;
#ifdef CONFIG_BLK
	struct udevice *dev;

	for (uclass_first_device(UCLASS_BLK, &dev);
	     dev;
	     uclass_next_device(&dev)) {
		struct blk_desc *desc = dev_get_uclass_platdata(dev);
		const char *if_typename = dev->driver->name;

		printf("Scanning disk %s...\n", dev->name);
		efi_disk_add_dev(dev->name, if_typename, desc, desc->devnum, 0);
		disks++;

		/*
		* El Torito images show up as block devices in an EFI world,
		* so let's create them here
		*/
		disks += efi_disk_create_eltorito(desc, if_typename,
						  desc->devnum);
	}
#else
	int i, if_type;

	/* Search for all available disk devices */
	for (if_type = 0; if_type < IF_TYPE_COUNT; if_type++) {
		const struct blk_driver *cur_drvr;
		const char *if_typename;

		cur_drvr = blk_driver_lookup_type(if_type);
		if (!cur_drvr)
			continue;

		if_typename = cur_drvr->if_typename;
		printf("Scanning disks on %s...\n", if_typename);
		for (i = 0; i < 4; i++) {
			struct blk_desc *desc;
			char devname[32] = { 0 }; /* dp->str is u16[32] long */

			desc = blk_get_devnum_by_type(if_type, i);
			if (!desc)
				continue;
			if (desc->type == DEV_TYPE_UNKNOWN)
				continue;

			snprintf(devname, sizeof(devname), "%s%d",
				 if_typename, i);
			efi_disk_add_dev(devname, if_typename, desc, i, 0);
			disks++;

			/*
			 * El Torito images show up as block devices
			 * in an EFI world, so let's create them here
			 */
			disks += efi_disk_create_eltorito(desc, if_typename, i);
		}
	}
#endif
	printf("Found %d disks\n", disks);

	return 0;
}