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efi_loader: identify EFI system partition

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In subsequent patches UEFI variables shalled be stored on the EFI system
partition. Hence we need to identify the EFI system partition.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Heinrich Schuchardt 2020-03-19 15:16:31 +01:00
parent 25801acc1f
commit 11078bb262
2 changed files with 27 additions and 0 deletions
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7
include/efi_loader.h
View file

@ -47,6 +47,13 @@ static inline void *guidcpy(void *dst, const void *src)
/* Root node */
extern efi_handle_t efi_root;
/* EFI system partition */
extern struct efi_system_partition {
enum if_type if_type;
int devnum;
u8 part;
} efi_system_partition;
int __efi_entry_check(void);
int __efi_exit_check(void);
const char *__efi_nesting(void);

20
lib/efi_loader/efi_disk.c
View file

@ -13,6 +13,8 @@
#include <part.h>
#include <malloc.h>
struct efi_system_partition efi_system_partition;
const efi_guid_t efi_block_io_guid = EFI_BLOCK_IO_PROTOCOL_GUID;
/**
@ -418,6 +420,24 @@ static efi_status_t efi_disk_add_dev(
diskobj->ops.media = &diskobj->media;
if (disk)
*disk = diskobj;
/* Store first EFI system partition */
if (part && !efi_system_partition.if_type) {
int r;
disk_partition_t info;
r = part_get_info(desc, part, &info);
if (r)
return EFI_DEVICE_ERROR;
if (info.bootable & PART_EFI_SYSTEM_PARTITION) {
efi_system_partition.if_type = desc->if_type;
efi_system_partition.devnum = desc->devnum;
efi_system_partition.part = part;
EFI_PRINT("EFI system partition: %s %d:%d\n",
blk_get_if_type_name(desc->if_type),
desc->devnum, part);
}
}
return EFI_SUCCESS;
}