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efi_loader: bootmgr: add load option helper functions

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In this patch, helper functions for an load option variable (BootXXXX)
are added:
* efi_deserialize_load_option(): parse a string into load_option data
			(renamed from parse_load_option and exported)
* efi_serialize_load_option(): convert load_option data into a string

Those functions will be used to implement efishell command.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
AKASHI Takahiro 2018-11-05 18:06:41 +09:00 • committed by Alexander Graf
parent 2419b161cc
commit 1a82b3413c
2 changed files with 83 additions and 33 deletions
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23
include/efi_loader.h
View file

@ -518,6 +518,29 @@ efi_status_t EFIAPI efi_set_variable(u16 *variable_name, efi_guid_t *vendor,
u32 attributes, efi_uintn_t data_size,
void *data);
/*
* See section 3.1.3 in the v2.7 UEFI spec for more details on
* the layout of EFI_LOAD_OPTION. In short it is:
*
* typedef struct _EFI_LOAD_OPTION {
* UINT32 Attributes;
* UINT16 FilePathListLength;
* // CHAR16 Description[]; <-- variable length, NULL terminated
* // EFI_DEVICE_PATH_PROTOCOL FilePathList[];
* <-- FilePathListLength bytes
* // UINT8 OptionalData[];
* } EFI_LOAD_OPTION;
*/
struct efi_load_option {
u32 attributes;
u16 file_path_length;
u16 *label;
struct efi_device_path *file_path;
u8 *optional_data;
};
void efi_deserialize_load_option(struct efi_load_option *lo, u8 *data);
unsigned long efi_serialize_load_option(struct efi_load_option *lo, u8 **data);
void *efi_bootmgr_load(struct efi_device_path **device_path,
struct efi_device_path **file_path);