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;
32 static efi_status_t efi_disk_open_block(void *handle, efi_guid_t *protocol,
33 void **protocol_interface, void *agent_handle,
34 void *controller_handle, uint32_t attributes)
36 struct efi_disk_obj *diskobj = handle;
38 *protocol_interface = &diskobj->ops;
43 static efi_status_t efi_disk_open_dp(void *handle, efi_guid_t *protocol,
44 void **protocol_interface, void *agent_handle,
45 void *controller_handle, uint32_t attributes)
47 struct efi_disk_obj *diskobj = handle;
49 *protocol_interface = diskobj->dp;
54 static efi_status_t EFIAPI efi_disk_reset(struct efi_block_io *this,
55 char extended_verification)
57 EFI_ENTRY("%p, %x", this, extended_verification);
58 return EFI_EXIT(EFI_DEVICE_ERROR);
61 enum efi_disk_direction {
66 static efi_status_t EFIAPI efi_disk_rw_blocks(struct efi_block_io *this,
67 u32 media_id, u64 lba, unsigned long buffer_size,
68 void *buffer, enum efi_disk_direction direction)
70 struct efi_disk_obj *diskobj;
71 struct blk_desc *desc;
76 EFI_ENTRY("%p, %x, %"PRIx64", %lx, %p", this, media_id, lba,
79 diskobj = container_of(this, struct efi_disk_obj, ops);
80 if (!(desc = blk_get_dev(diskobj->ifname, diskobj->dev_index)))
81 return EFI_EXIT(EFI_DEVICE_ERROR);
83 blocks = buffer_size / blksz;
86 printf("EFI: %s:%d blocks=%x lba=%"PRIx64" blksz=%x dir=%d\n", __func__,
87 __LINE__, blocks, lba, blksz, direction);
90 /* We only support full block access */
91 if (buffer_size & (blksz - 1))
92 return EFI_EXIT(EFI_DEVICE_ERROR);
94 if (direction == EFI_DISK_READ)
95 n = desc->block_read(desc, lba, blocks, buffer);
97 n = desc->block_write(desc, lba, blocks, buffer);
99 /* We don't do interrupts, so check for timers cooperatively */
103 printf("EFI: %s:%d n=%lx blocks=%x\n", __func__, __LINE__, n, blocks);
106 return EFI_EXIT(EFI_DEVICE_ERROR);
108 return EFI_EXIT(EFI_SUCCESS);
111 static efi_status_t efi_disk_read_blocks(struct efi_block_io *this,
112 u32 media_id, u64 lba, unsigned long buffer_size,
115 return efi_disk_rw_blocks(this, media_id, lba, buffer_size, buffer,
119 static efi_status_t efi_disk_write_blocks(struct efi_block_io *this,
120 u32 media_id, u64 lba, unsigned long buffer_size,
123 return efi_disk_rw_blocks(this, media_id, lba, buffer_size, buffer,
127 static efi_status_t EFIAPI efi_disk_flush_blocks(struct efi_block_io *this)
129 /* We always write synchronously */
130 EFI_ENTRY("%p", this);
131 return EFI_EXIT(EFI_SUCCESS);
134 static const struct efi_block_io block_io_disk_template = {
135 .reset = &efi_disk_reset,
136 .read_blocks = &efi_disk_read_blocks,
137 .write_blocks = &efi_disk_write_blocks,
138 .flush_blocks = &efi_disk_flush_blocks,
142 * U-Boot doesn't have a list of all online disk devices. So when running our
143 * EFI payload, we scan through all of the potentially available ones and
144 * store them in our object pool.
146 * This gets called from do_bootefi_exec().
148 int efi_disk_register(void)
150 const struct block_drvr *cur_drvr;
154 /* Search for all available disk devices */
155 for (cur_drvr = block_drvr; cur_drvr->name; cur_drvr++) {
156 printf("Scanning disks on %s...\n", cur_drvr->name);
157 for (i = 0; i < 4; i++) {
158 struct blk_desc *desc;
159 struct efi_disk_obj *diskobj;
160 struct efi_device_path_file_path *dp;
161 int objlen = sizeof(*diskobj) + (sizeof(*dp) * 2);
162 char devname[16] = { 0 }; /* dp->str is u16[16] long */
164 desc = blk_get_dev(cur_drvr->name, i);
167 if (desc->type == DEV_TYPE_UNKNOWN)
170 diskobj = calloc(1, objlen);
172 /* Fill in object data */
173 diskobj->parent.protocols[0].guid = &efi_block_io_guid;
174 diskobj->parent.protocols[0].open = efi_disk_open_block;
175 diskobj->parent.protocols[1].guid = &efi_guid_device_path;
176 diskobj->parent.protocols[1].open = efi_disk_open_dp;
177 diskobj->parent.handle = diskobj;
178 diskobj->ops = block_io_disk_template;
179 diskobj->ifname = cur_drvr->name;
180 diskobj->dev_index = i;
182 /* Fill in EFI IO Media info (for read/write callbacks) */
183 diskobj->media.removable_media = desc->removable;
184 diskobj->media.media_present = 1;
185 diskobj->media.block_size = desc->blksz;
186 diskobj->media.io_align = desc->blksz;
187 diskobj->media.last_block = desc->lba;
188 diskobj->ops.media = &diskobj->media;
190 /* Fill in device path */
191 dp = (void*)&diskobj[1];
193 dp[0].dp.type = DEVICE_PATH_TYPE_MEDIA_DEVICE;
194 dp[0].dp.sub_type = DEVICE_PATH_SUB_TYPE_FILE_PATH;
195 dp[0].dp.length = sizeof(*dp);
196 snprintf(devname, sizeof(devname), "%s%d",
198 ascii2unicode(dp[0].str, devname);
200 dp[1].dp.type = DEVICE_PATH_TYPE_END;
201 dp[1].dp.sub_type = DEVICE_PATH_SUB_TYPE_END;
202 dp[1].dp.length = sizeof(*dp);
204 /* Hook up to the device list */
205 list_add_tail(&diskobj->parent.link, &efi_obj_list);
209 printf("Found %d disks\n", disks);