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[efi] Add ability to extract device path from an EFI load option

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An EFI boot option (stored in a BootXXXX variable) comprises an
EFI_LOAD_OPTION structure, which includes some undefined number of EFI
device paths.  (The structure is extremely messy and awkward to parse
in C, but that's par for the course with EFI.)

Add a function to extract the first device path from an EFI load
option, along with wrapper functions to read and extract the first
device path from an EFI boot variable.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2025-08-28 15:34:32 +01:00
parent 5bec2604a3
commit c10da8b53c
2 changed files with 204 additions and 0 deletions
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5
src/include/ipxe/efi/efi_path.h
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@@ -43,6 +43,7 @@ efi_path_prev ( EFI_DEVICE_PATH_PROTOCOL *path,
extern EFI_DEVICE_PATH_PROTOCOL *
efi_path_end ( EFI_DEVICE_PATH_PROTOCOL *path );
extern size_t efi_path_len ( EFI_DEVICE_PATH_PROTOCOL *path );
extern int efi_path_check ( EFI_DEVICE_PATH_PROTOCOL *path, size_t max );
extern void * efi_path_mac ( EFI_DEVICE_PATH_PROTOCOL *path );
extern unsigned int efi_path_vlan ( EFI_DEVICE_PATH_PROTOCOL *path );
extern int efi_path_guid ( EFI_DEVICE_PATH_PROTOCOL *path, union uuid *uuid );
@@ -58,6 +59,10 @@ extern EFI_DEVICE_PATH_PROTOCOL * efi_fcp_path ( struct fcp_description *desc );
extern EFI_DEVICE_PATH_PROTOCOL *
efi_ib_srp_path ( struct ib_srp_device *ib_srp );
extern EFI_DEVICE_PATH_PROTOCOL * efi_usb_path ( struct usb_function *func );
extern EFI_DEVICE_PATH_PROTOCOL * efi_load_path ( EFI_LOAD_OPTION *load,
size_t len );
extern EFI_DEVICE_PATH_PROTOCOL * efi_boot_path ( unsigned int number );
extern EFI_DEVICE_PATH_PROTOCOL * efi_current_boot_path ( void );
extern EFI_DEVICE_PATH_PROTOCOL * efi_describe ( struct interface *interface );
#define efi_describe_TYPE( object_type ) \