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efi_loader: prefer EFI system partition

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When booting from a block io device, prefer the EFI system
partition over other partitions.

Signed-off-by: Mark Kettenis <kettenis@openbsd.org>
This commit is contained in:
Mark Kettenis 2024-04-07 10:04:19 +02:00
parent 85c637aa26
commit 582f851413
1 changed files with 22 additions and 0 deletions
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22
lib/efi_loader/efi_bootmgr.c
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@ -14,6 +14,7 @@
#include <log.h>
#include <malloc.h>
#include <net.h>
#include <part.h>
#include <efi_default_filename.h>
#include <efi_loader.h>
#include <efi_variable.h>
@ -306,6 +307,7 @@ err:
static efi_status_t fill_default_file_path(struct udevice *blk,
struct efi_device_path **dp)
{
struct blk_desc *desc = dev_get_uclass_plat(blk);
efi_status_t ret;
struct udevice *partition;
@ -314,6 +316,26 @@ static efi_status_t fill_default_file_path(struct udevice *blk,
if (ret == EFI_SUCCESS)
return ret;
/* try EFI system partition */
if (desc->uclass_id == efi_system_partition.uclass_id &&
desc->devnum == efi_system_partition.devnum) {
device_foreach_child(partition, blk) {
struct disk_part *part;
enum uclass_id id;
id = device_get_uclass_id(partition);
if (id != UCLASS_PARTITION)
continue;
part = dev_get_uclass_plat(partition);
if (part->partnum == efi_system_partition.part) {
ret = search_default_file(partition, dp);
if (ret == EFI_SUCCESS)
return ret;
}
}
}
/* try the partitions */
device_foreach_child(partition, blk) {
enum uclass_id id;