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
,
141 static void efi_disk_add_dev(char *name
,
142 const struct block_drvr
*cur_drvr
,
143 const struct blk_desc
*desc
,
147 struct efi_disk_obj
*diskobj
;
148 struct efi_device_path_file_path
*dp
;
149 int objlen
= sizeof(*diskobj
) + (sizeof(*dp
) * 2);
151 diskobj
= calloc(1, objlen
);
153 /* Fill in object data */
154 diskobj
->parent
.protocols
[0].guid
= &efi_block_io_guid
;
155 diskobj
->parent
.protocols
[0].open
= efi_disk_open_block
;
156 diskobj
->parent
.protocols
[1].guid
= &efi_guid_device_path
;
157 diskobj
->parent
.protocols
[1].open
= efi_disk_open_dp
;
158 diskobj
->parent
.handle
= diskobj
;
159 diskobj
->ops
= block_io_disk_template
;
160 diskobj
->ifname
= cur_drvr
->name
;
161 diskobj
->dev_index
= dev_index
;
163 /* Fill in EFI IO Media info (for read/write callbacks) */
164 diskobj
->media
.removable_media
= desc
->removable
;
165 diskobj
->media
.media_present
= 1;
166 diskobj
->media
.block_size
= desc
->blksz
;
167 diskobj
->media
.io_align
= desc
->blksz
;
168 diskobj
->media
.last_block
= desc
->lba
;
169 diskobj
->ops
.media
= &diskobj
->media
;
171 /* Fill in device path */
172 dp
= (void*)&diskobj
[1];
174 dp
[0].dp
.type
= DEVICE_PATH_TYPE_MEDIA_DEVICE
;
175 dp
[0].dp
.sub_type
= DEVICE_PATH_SUB_TYPE_FILE_PATH
;
176 dp
[0].dp
.length
= sizeof(*dp
);
177 ascii2unicode(dp
[0].str
, name
);
179 dp
[1].dp
.type
= DEVICE_PATH_TYPE_END
;
180 dp
[1].dp
.sub_type
= DEVICE_PATH_SUB_TYPE_END
;
181 dp
[1].dp
.length
= sizeof(*dp
);
183 /* Hook up to the device list */
184 list_add_tail(&diskobj
->parent
.link
, &efi_obj_list
);
188 * U-Boot doesn't have a list of all online disk devices. So when running our
189 * EFI payload, we scan through all of the potentially available ones and
190 * store them in our object pool.
192 * This gets called from do_bootefi_exec().
194 int efi_disk_register(void)
196 const struct block_drvr
*cur_drvr
;
200 /* Search for all available disk devices */
201 for (cur_drvr
= block_drvr
; cur_drvr
->name
; cur_drvr
++) {
202 printf("Scanning disks on %s...\n", cur_drvr
->name
);
203 for (i
= 0; i
< 4; i
++) {
204 struct blk_desc
*desc
;
205 char devname
[16] = { 0 }; /* dp->str is u16[16] long */
207 desc
= blk_get_dev(cur_drvr
->name
, i
);
210 if (desc
->type
== DEV_TYPE_UNKNOWN
)
213 snprintf(devname
, sizeof(devname
), "%s%d",
215 efi_disk_add_dev(devname
, cur_drvr
, desc
, i
, 0);
219 printf("Found %d disks\n", disks
);