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[efi] Add efi_path_guid() utility function

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EFI provides no API for determining the partition GUID (if any) for a
specified device handle.  The partition GUID appears to be exposed
only as part of the device path.

Add efi_path_guid() to extract the partition GUID (if any) from a
device path.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2024-03-05 20:00:15 +00:00
parent 636ccb4ca5
commit c4471e3408
3 changed files with 46 additions and 0 deletions
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src/include/ipxe/efi/efi_path.h
+2
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@@ -20,6 +20,7 @@ struct aoe_device;
struct fcp_description;
struct ib_srp_device;
struct usb_function;
union uuid;
/**
* Terminate device path
@@ -43,6 +44,7 @@ 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 unsigned int efi_path_vlan ( EFI_DEVICE_PATH_PROTOCOL *path );
extern int efi_path_guid ( EFI_DEVICE_PATH_PROTOCOL *path, union uuid *uuid );
extern EFI_DEVICE_PATH_PROTOCOL * efi_paths ( EFI_DEVICE_PATH_PROTOCOL *first,
... );
extern EFI_DEVICE_PATH_PROTOCOL * efi_netdev_path ( struct net_device *netdev );
src/include/ipxe/errfile.h
+1
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@@ -80,6 +80,7 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#define ERRFILE_acpimac ( ERRFILE_CORE | 0x00280000 )
#define ERRFILE_efi_strings ( ERRFILE_CORE | 0x00290000 )
#define ERRFILE_uuid ( ERRFILE_CORE | 0x002a0000 )
#define ERRFILE_efi_path ( ERRFILE_CORE | 0x002b0000 )
#define ERRFILE_eisa ( ERRFILE_DRIVER | 0x00000000 )
#define ERRFILE_isa ( ERRFILE_DRIVER | 0x00010000 )