2 * EFI application disk support
4 * Copyright (c) 2016 Alexander Graf
6 * SPDX-License-Identifier: GPL-2.0+
11 #include <efi_loader.h>
16 static const efi_guid_t efi_block_io_guid = BLOCK_IO_GUID;
19 /* Generic EFI object parent class data */
20 struct efi_object parent;
21 /* EFI Interface callback struct for block I/O */
22 struct efi_block_io ops;
23 /* U-Boot ifname for block device */
25 /* U-Boot dev_index for block device */
27 /* EFI Interface Media descriptor struct, referenced by ops */
28 struct efi_block_io_media media;
29 /* EFI device path to this block device */
30 struct efi_device_path_file_path *dp;
31 /* Offset into disk for simple partitions */
35 static efi_status_t efi_disk_open_block(void *handle, efi_guid_t *protocol,
36 void **protocol_interface, void *agent_handle,
37 void *controller_handle, uint32_t attributes)
39 struct efi_disk_obj *diskobj = handle;
41 *protocol_interface = &diskobj->ops;
46 static efi_status_t efi_disk_open_dp(void *handle, efi_guid_t *protocol,
47 void **protocol_interface, void *agent_handle,
48 void *controller_handle, uint32_t attributes)
50 struct efi_disk_obj *diskobj = handle;
52 *protocol_interface = diskobj->dp;
57 static efi_status_t EFIAPI efi_disk_reset(struct efi_block_io *this,
58 char extended_verification)
60 EFI_ENTRY("%p, %x", this, extended_verification);
61 return EFI_EXIT(EFI_DEVICE_ERROR);
64 enum efi_disk_direction {
69 static efi_status_t EFIAPI efi_disk_rw_blocks(struct efi_block_io *this,
70 u32 media_id, u64 lba, unsigned long buffer_size,
71 void *buffer, enum efi_disk_direction direction)
73 struct efi_disk_obj *diskobj;
74 struct blk_desc *desc;
79 EFI_ENTRY("%p, %x, %"PRIx64", %lx, %p", this, media_id, lba,
82 diskobj = container_of(this, struct efi_disk_obj, ops);
83 if (!(desc = blk_get_dev(diskobj->ifname, diskobj->dev_index)))
84 return EFI_EXIT(EFI_DEVICE_ERROR);
86 blocks = buffer_size / blksz;
87 lba += diskobj->offset;
90 printf("EFI: %s:%d blocks=%x lba=%"PRIx64" blksz=%x dir=%d\n", __func__,
91 __LINE__, blocks, lba, blksz, direction);
94 /* We only support full block access */
95 if (buffer_size & (blksz - 1))
96 return EFI_EXIT(EFI_DEVICE_ERROR);
98 if (direction == EFI_DISK_READ)
99 n = desc->block_read(desc, lba, blocks, buffer);
101 n = desc->block_write(desc, lba, blocks, buffer);
103 /* We don't do interrupts, so check for timers cooperatively */
107 printf("EFI: %s:%d n=%lx blocks=%x\n", __func__, __LINE__, n, blocks);
110 return EFI_EXIT(EFI_DEVICE_ERROR);
112 return EFI_EXIT(EFI_SUCCESS);
115 static efi_status_t efi_disk_read_blocks(struct efi_block_io *this,
116 u32 media_id, u64 lba, unsigned long buffer_size,
119 return efi_disk_rw_blocks(this, media_id, lba, buffer_size, buffer,
123 static efi_status_t efi_disk_write_blocks(struct efi_block_io *this,
124 u32 media_id, u64 lba, unsigned long buffer_size,
127 return efi_disk_rw_blocks(this, media_id, lba, buffer_size, buffer,
131 static efi_status_t EFIAPI efi_disk_flush_blocks(struct efi_block_io *this)
133 /* We always write synchronously */
134 EFI_ENTRY("%p", this);
135 return EFI_EXIT(EFI_SUCCESS);
138 static const struct efi_block_io block_io_disk_template = {
139 .reset = &efi_disk_reset,
140 .read_blocks = &efi_disk_read_blocks,
141 .write_blocks = &efi_disk_write_blocks,
142 .flush_blocks = &efi_disk_flush_blocks,
145 static void efi_disk_add_dev(char *name,
146 const struct blk_driver *cur_drvr,
147 const struct blk_desc *desc,
151 struct efi_disk_obj *diskobj;
152 struct efi_device_path_file_path *dp;
153 int objlen = sizeof(*diskobj) + (sizeof(*dp) * 2);
155 diskobj = calloc(1, objlen);
157 /* Fill in object data */
158 diskobj->parent.protocols[0].guid = &efi_block_io_guid;
159 diskobj->parent.protocols[0].open = efi_disk_open_block;
160 diskobj->parent.protocols[1].guid = &efi_guid_device_path;
161 diskobj->parent.protocols[1].open = efi_disk_open_dp;
162 diskobj->parent.handle = diskobj;
163 diskobj->ops = block_io_disk_template;
164 diskobj->ifname = cur_drvr->if_typename;
165 diskobj->dev_index = dev_index;
166 diskobj->offset = offset;
168 /* Fill in EFI IO Media info (for read/write callbacks) */
169 diskobj->media.removable_media = desc->removable;
170 diskobj->media.media_present = 1;
171 diskobj->media.block_size = desc->blksz;
172 diskobj->media.io_align = desc->blksz;
173 diskobj->media.last_block = desc->lba;
174 diskobj->ops.media = &diskobj->media;
176 /* Fill in device path */
177 dp = (void*)&diskobj[1];
179 dp[0].dp.type = DEVICE_PATH_TYPE_MEDIA_DEVICE;
180 dp[0].dp.sub_type = DEVICE_PATH_SUB_TYPE_FILE_PATH;
181 dp[0].dp.length = sizeof(*dp);
182 ascii2unicode(dp[0].str, name);
184 dp[1].dp.type = DEVICE_PATH_TYPE_END;
185 dp[1].dp.sub_type = DEVICE_PATH_SUB_TYPE_END;
186 dp[1].dp.length = sizeof(*dp);
188 /* Hook up to the device list */
189 list_add_tail(&diskobj->parent.link, &efi_obj_list);
192 static int efi_disk_create_eltorito(struct blk_desc *desc,
193 const struct blk_driver *cur_drvr,
197 #ifdef CONFIG_ISO_PARTITION
198 char devname[32] = { 0 }; /* dp->str is u16[32] long */
199 disk_partition_t info;
202 if (desc->part_type != PART_TYPE_ISO)
205 while (!part_get_info(desc, part, &info)) {
206 snprintf(devname, sizeof(devname), "%s%d:%d",
207 cur_drvr->if_typename, diskid, part);
208 efi_disk_add_dev(devname, cur_drvr, desc, diskid, info.start);
218 * U-Boot doesn't have a list of all online disk devices. So when running our
219 * EFI payload, we scan through all of the potentially available ones and
220 * store them in our object pool.
222 * This gets called from do_bootefi_exec().
224 int efi_disk_register(void)
226 const struct blk_driver *cur_drvr;
230 /* Search for all available disk devices */
231 for (if_type = 0; if_type < IF_TYPE_COUNT; if_type++) {
232 cur_drvr = blk_driver_lookup_type(if_type);
236 printf("Scanning disks on %s...\n", cur_drvr->if_typename);
237 for (i = 0; i < 4; i++) {
238 struct blk_desc *desc;
239 char devname[32] = { 0 }; /* dp->str is u16[32] long */
241 desc = blk_get_devnum_by_type(if_type, i);
244 if (desc->type == DEV_TYPE_UNKNOWN)
247 snprintf(devname, sizeof(devname), "%s%d",
248 cur_drvr->if_typename, i);
249 efi_disk_add_dev(devname, cur_drvr, desc, i, 0);
253 * El Torito images show up as block devices
254 * in an EFI world, so let's create them here
256 disks += efi_disk_create_eltorito(desc, cur_drvr, i);
259 printf("Found %d disks\n", disks);