2 * EFI application disk support
4 * Copyright (c) 2016 Alexander Graf
6 * SPDX-License-Identifier: GPL-2.0+
10 #include <efi_loader.h>
15 static const efi_guid_t efi_block_io_guid = BLOCK_IO_GUID;
18 /* Generic EFI object parent class data */
19 struct efi_object parent;
20 /* EFI Interface callback struct for block I/O */
21 struct efi_block_io ops;
22 /* U-Boot ifname for block device */
24 /* U-Boot dev_index for block device */
26 /* EFI Interface Media descriptor struct, referenced by ops */
27 struct efi_block_io_media media;
28 /* EFI device path to this block device */
29 struct efi_device_path_file_path *dp;
30 /* Offset into disk for simple partitions */
34 static efi_status_t efi_disk_open_block(void *handle, efi_guid_t *protocol,
35 void **protocol_interface, void *agent_handle,
36 void *controller_handle, uint32_t attributes)
38 struct efi_disk_obj *diskobj = handle;
40 *protocol_interface = &diskobj->ops;
45 static efi_status_t efi_disk_open_dp(void *handle, efi_guid_t *protocol,
46 void **protocol_interface, void *agent_handle,
47 void *controller_handle, uint32_t attributes)
49 struct efi_disk_obj *diskobj = handle;
51 *protocol_interface = diskobj->dp;
56 static efi_status_t EFIAPI efi_disk_reset(struct efi_block_io *this,
57 char extended_verification)
59 EFI_ENTRY("%p, %x", this, extended_verification);
60 return EFI_EXIT(EFI_DEVICE_ERROR);
63 enum efi_disk_direction {
68 static efi_status_t EFIAPI efi_disk_rw_blocks(struct efi_block_io *this,
69 u32 media_id, u64 lba, unsigned long buffer_size,
70 void *buffer, enum efi_disk_direction direction)
72 struct efi_disk_obj *diskobj;
73 struct blk_desc *desc;
78 EFI_ENTRY("%p, %x, %"PRIx64", %lx, %p", this, media_id, lba,
81 diskobj = container_of(this, struct efi_disk_obj, ops);
82 if (!(desc = blk_get_dev(diskobj->ifname, diskobj->dev_index)))
83 return EFI_EXIT(EFI_DEVICE_ERROR);
85 blocks = buffer_size / blksz;
86 lba += diskobj->offset;
89 printf("EFI: %s:%d blocks=%x lba=%"PRIx64" blksz=%x dir=%d\n", __func__,
90 __LINE__, blocks, lba, blksz, direction);
93 /* We only support full block access */
94 if (buffer_size & (blksz - 1))
95 return EFI_EXIT(EFI_DEVICE_ERROR);
97 if (direction == EFI_DISK_READ)
98 n = desc->block_read(desc, lba, blocks, buffer);
100 n = desc->block_write(desc, lba, blocks, buffer);
102 /* We don't do interrupts, so check for timers cooperatively */
106 printf("EFI: %s:%d n=%lx blocks=%x\n", __func__, __LINE__, n, blocks);
109 return EFI_EXIT(EFI_DEVICE_ERROR);
111 return EFI_EXIT(EFI_SUCCESS);
114 static efi_status_t efi_disk_read_blocks(struct efi_block_io *this,
115 u32 media_id, u64 lba, unsigned long buffer_size,
118 return efi_disk_rw_blocks(this, media_id, lba, buffer_size, buffer,
122 static efi_status_t efi_disk_write_blocks(struct efi_block_io *this,
123 u32 media_id, u64 lba, unsigned long buffer_size,
126 return efi_disk_rw_blocks(this, media_id, lba, buffer_size, buffer,
130 static efi_status_t EFIAPI efi_disk_flush_blocks(struct efi_block_io *this)
132 /* We always write synchronously */
133 EFI_ENTRY("%p", this);
134 return EFI_EXIT(EFI_SUCCESS);
137 static const struct efi_block_io block_io_disk_template = {
138 .reset = &efi_disk_reset,
139 .read_blocks = &efi_disk_read_blocks,
140 .write_blocks = &efi_disk_write_blocks,
141 .flush_blocks = &efi_disk_flush_blocks,
144 static void efi_disk_add_dev(char *name,
145 const struct block_drvr *cur_drvr,
146 const struct blk_desc *desc,
150 struct efi_disk_obj *diskobj;
151 struct efi_device_path_file_path *dp;
152 int objlen = sizeof(*diskobj) + (sizeof(*dp) * 2);
154 diskobj = calloc(1, objlen);
156 /* Fill in object data */
157 diskobj->parent.protocols[0].guid = &efi_block_io_guid;
158 diskobj->parent.protocols[0].open = efi_disk_open_block;
159 diskobj->parent.protocols[1].guid = &efi_guid_device_path;
160 diskobj->parent.protocols[1].open = efi_disk_open_dp;
161 diskobj->parent.handle = diskobj;
162 diskobj->ops = block_io_disk_template;
163 diskobj->ifname = cur_drvr->name;
164 diskobj->dev_index = dev_index;
165 diskobj->offset = offset;
167 /* Fill in EFI IO Media info (for read/write callbacks) */
168 diskobj->media.removable_media = desc->removable;
169 diskobj->media.media_present = 1;
170 diskobj->media.block_size = desc->blksz;
171 diskobj->media.io_align = desc->blksz;
172 diskobj->media.last_block = desc->lba;
173 diskobj->ops.media = &diskobj->media;
175 /* Fill in device path */
176 dp = (void*)&diskobj[1];
178 dp[0].dp.type = DEVICE_PATH_TYPE_MEDIA_DEVICE;
179 dp[0].dp.sub_type = DEVICE_PATH_SUB_TYPE_FILE_PATH;
180 dp[0].dp.length = sizeof(*dp);
181 ascii2unicode(dp[0].str, name);
183 dp[1].dp.type = DEVICE_PATH_TYPE_END;
184 dp[1].dp.sub_type = DEVICE_PATH_SUB_TYPE_END;
185 dp[1].dp.length = sizeof(*dp);
187 /* Hook up to the device list */
188 list_add_tail(&diskobj->parent.link, &efi_obj_list);
191 static int efi_disk_create_eltorito(struct blk_desc *desc,
192 const struct block_drvr *cur_drvr,
196 #ifdef CONFIG_ISO_PARTITION
197 char devname[32] = { 0 }; /* dp->str is u16[32] long */
198 disk_partition_t info;
201 if (desc->part_type != PART_TYPE_ISO)
204 while (!part_get_info(desc, part, &info)) {
205 snprintf(devname, sizeof(devname), "%s%d:%d", cur_drvr->name,
207 efi_disk_add_dev(devname, cur_drvr, desc, diskid, info.start);
217 * U-Boot doesn't have a list of all online disk devices. So when running our
218 * EFI payload, we scan through all of the potentially available ones and
219 * store them in our object pool.
221 * This gets called from do_bootefi_exec().
223 int efi_disk_register(void)
225 const struct block_drvr *cur_drvr;
229 /* Search for all available disk devices */
230 for (cur_drvr = block_drvr; cur_drvr->name; cur_drvr++) {
231 printf("Scanning disks on %s...\n", cur_drvr->name);
232 for (i = 0; i < 4; i++) {
233 struct blk_desc *desc;
234 char devname[32] = { 0 }; /* dp->str is u16[32] long */
236 desc = blk_get_dev(cur_drvr->name, i);
239 if (desc->type == DEV_TYPE_UNKNOWN)
242 snprintf(devname, sizeof(devname), "%s%d",
244 efi_disk_add_dev(devname, cur_drvr, desc, i, 0);
248 * El Torito images show up as block devices
249 * in an EFI world, so let's create them here
251 disks += efi_disk_create_eltorito(desc, cur_drvr, i);
254 printf("Found %d disks\n", disks);