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[efi] Make EFI_DEVICE_PATH_TO_TEXT_PROTOCOL optional

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Some UEFI systems (observed with a Mac Pro) do not provide
EFI_DEVICE_PATH_TO_TEXT_PROTOCOL.  Since we use this protocol only for
debug messages, make it optional and fall back to printing the raw
device path bytes.

Reported-by: Matt Woodward <pxematt@woodwardcc.com>
Tested-by: Matt Woodward <pxematt@woodwardcc.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown 2014-05-19 20:24:04 +01:00
parent 95cff6a4d8
commit 21c43e44cb
1 changed files with 15 additions and 9 deletions
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24
src/interface/efi/efi_debug.c
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@ -37,7 +37,7 @@ FILE_LICENCE ( GPL2_OR_LATER );
/** Device path to text protocol */
static EFI_DEVICE_PATH_TO_TEXT_PROTOCOL *efidpt;
EFI_REQUIRE_PROTOCOL ( EFI_DEVICE_PATH_TO_TEXT_PROTOCOL, &efidpt );
EFI_REQUEST_PROTOCOL ( EFI_DEVICE_PATH_TO_TEXT_PROTOCOL, &efidpt );
/**
* Convert GUID to a printable string
@ -99,19 +99,25 @@ void dbg_efi_devpath ( EFI_DEVICE_PATH_PROTOCOL *path ) {
size_t len;
/* Convert path to a textual representation */
if ( ! efidpt )
goto err_no_efidpt;
text = efidpt->ConvertDevicePathToText ( path, TRUE, FALSE );
if ( ! text ) {
printf ( "<cannot convert>:\n" );
end = efi_devpath_end ( path );
len = ( ( ( void * ) end ) - ( ( void * ) path ) +
sizeof ( *end ) );
dbg_hex_dump_da ( 0, path, len );
return;
}
if ( ! text )
goto err_convert;
/* Print path */
printf ( "%ls", text );
/* Free path */
bs->FreePool ( text );
return;
err_convert:
err_no_efidpt:
printf ( "<cannot convert>:\n" );
end = efi_devpath_end ( path );
len = ( ( ( void * ) end ) - ( ( void * ) path ) +
sizeof ( *end ) );
dbg_hex_dump_da ( 0, path, len );
}