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efi_loader: Add el torito support

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When loading an el torito image, uEFI exposes said image as a raw
block device to the payload.

Let's do the same by creating new block devices with added offsets for
the respective el torito partitions.

Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Alexander Graf 2016-04-11 16:16:18 +02:00 committed by Tom Rini
parent 4a12a97c14
commit 8c3df0bf2e
2 changed files with 49 additions and 0 deletions
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14
cmd/bootefi.c
View File

@ -194,12 +194,26 @@ U_BOOT_CMD(
void efi_set_bootdev(const char *dev, const char *devnr)
{
__maybe_unused struct blk_desc *desc;
char devname[16] = { 0 }; /* dp->str is u16[16] long */
char *colon;
/* Assemble the condensed device name we use in efi_disk.c */
snprintf(devname, sizeof(devname), "%s%s", dev, devnr);
colon = strchr(devname, ':');
#ifdef CONFIG_ISO_PARTITION
/* For ISOs we create partition block devices */
desc = blk_get_dev(dev, simple_strtol(devnr, NULL, 10));
if (desc && (desc->type != DEV_TYPE_UNKNOWN) &&
(desc->part_type == PART_TYPE_ISO)) {
if (!colon)
snprintf(devname, sizeof(devname), "%s%s:1", dev,
devnr);
colon = NULL;
}
#endif
if (colon)
*colon = '\0';

35
lib/efi_loader/efi_disk.c
View File

@ -27,6 +27,8 @@ struct efi_disk_obj {
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,
@ -81,6 +83,7 @@ static efi_status_t EFIAPI efi_disk_rw_blocks(struct efi_block_io *this,
return EFI_EXIT(EFI_DEVICE_ERROR);
blksz = desc->blksz;
blocks = buffer_size / blksz;
lba += diskobj->offset;
#ifdef DEBUG_EFI
printf("EFI: %s:%d blocks=%x lba=%"PRIx64" blksz=%x dir=%d\n", __func__,
@ -159,6 +162,7 @@ static void efi_disk_add_dev(char *name,
diskobj->ops = block_io_disk_template;
diskobj->ifname = cur_drvr->name;
diskobj->dev_index = dev_index;
diskobj->offset = offset;
/* Fill in EFI IO Media info (for read/write callbacks) */
diskobj->media.removable_media = desc->removable;
@ -184,6 +188,31 @@ static void efi_disk_add_dev(char *name,
list_add_tail(&diskobj->parent.link, &efi_obj_list);
}
static int efi_disk_create_eltorito(struct blk_desc *desc,
const struct block_drvr *cur_drvr,
int diskid)
{
int disks = 0;
#ifdef CONFIG_ISO_PARTITION
char devname[16] = { 0 }; /* dp->str is u16[16] 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", cur_drvr->name,
diskid, part);
efi_disk_add_dev(devname, cur_drvr, 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
@ -214,6 +243,12 @@ int efi_disk_register(void)
cur_drvr->name, i);
efi_disk_add_dev(devname, cur_drvr, 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, cur_drvr, i);
}
}
printf("Found %d disks\n", disks);