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/*
* Copyright (C) 2013 Michael Brown <mbrown@fensystems.co.uk>.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
FILE_LICENCE ( GPL2_OR_LATER );
/**
* @file
*
* EFI debugging utilities
*
*/
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <ipxe/uuid.h>
#include <ipxe/efi/efi.h>
#include <ipxe/efi/efi_driver.h>
#include <ipxe/efi/Protocol/DevicePath.h>
#include <ipxe/efi/Protocol/DevicePathToText.h>
#include <ipxe/efi/Protocol/BlockIo.h>
#include <ipxe/efi/Protocol/DiskIo.h>
#include <ipxe/efi/Protocol/SimpleFileSystem.h>
#include <ipxe/efi/Protocol/SimpleNetwork.h>
/** Device path protocol GUID */
static EFI_GUID efi_device_path_protocol_guid
= EFI_DEVICE_PATH_PROTOCOL_GUID;
/** Device path to text protocol */
static EFI_DEVICE_PATH_TO_TEXT_PROTOCOL *efidpt;
EFI_REQUEST_PROTOCOL ( EFI_DEVICE_PATH_TO_TEXT_PROTOCOL, &efidpt );
/** A well-known GUID */
struct efi_well_known_guid {
/** GUID */
EFI_GUID guid;
/** Name */
const char *name;
};
/** Well-known GUIDs */
static struct efi_well_known_guid efi_well_known_guids[] = {
{ EFI_BLOCK_IO_PROTOCOL_GUID, "BlockIo" },
{ EFI_DISK_IO_PROTOCOL_GUID, "DiskIo" },
{ EFI_DEVICE_PATH_PROTOCOL_GUID, "DevicePath" },
{ EFI_LOADED_IMAGE_PROTOCOL_GUID, "LoadedImage" },
{ EFI_SIMPLE_FILE_SYSTEM_PROTOCOL_GUID, "SimpleFileSystem" },
{ EFI_SIMPLE_NETWORK_PROTOCOL_GUID, "SimpleNetwork" },
};
/**
* Convert GUID to a printable string
*
* @v guid GUID
* @ret string Printable string
*/
const char * efi_guid_ntoa ( EFI_GUID *guid ) {
union {
union uuid uuid;
EFI_GUID guid;
} u;
unsigned int i;
/* Check for a match against well-known GUIDs */
for ( i = 0 ; i < ( sizeof ( efi_well_known_guids ) /
sizeof ( efi_well_known_guids[0] ) ) ; i++ ) {
if ( memcmp ( guid, &efi_well_known_guids[i].guid,
sizeof ( *guid ) ) == 0 ) {
return efi_well_known_guids[i].name;
}
}
/* Convert GUID to standard endianness */
memcpy ( &u.guid, guid, sizeof ( u.guid ) );
uuid_mangle ( &u.uuid );
return uuid_ntoa ( &u.uuid );
}
/**
* Print list of protocol handlers attached to a handle
*
* @v handle EFI handle
*/
void dbg_efi_protocols ( EFI_HANDLE handle ) {
EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
EFI_GUID **protocols;
UINTN count;
unsigned int i;
EFI_STATUS efirc;
int rc;
/* Retrieve list of protocols */
if ( ( efirc = bs->ProtocolsPerHandle ( handle, &protocols,
&count ) ) != 0 ) {
rc = -EEFI ( efirc );
printf ( "EFI could not retrieve protocols for %p: %s\n",
handle, strerror ( rc ) );
return;
}
/* Dump list of protocols */
for ( i = 0 ; i < count ; i++ )
printf ( "%s\n", efi_guid_ntoa ( protocols[i] ) );
/* Free list */
bs->FreePool ( protocols );
}
/**
* Get textual representation of device path
*
* @v path Device path
* @ret text Textual representation of device path, or NULL
*/
const char * efi_devpath_text ( EFI_DEVICE_PATH_PROTOCOL *path ) {
EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
static char text[256];
CHAR16 *wtext;
/* Convert path to a textual representation */
if ( ! efidpt )
return NULL;
wtext = efidpt->ConvertDevicePathToText ( path, TRUE, FALSE );
if ( ! wtext )
return NULL;
/* Store path in buffer */
snprintf ( text, sizeof ( text ), "%ls", wtext );
/* Free path */
bs->FreePool ( wtext );
return text;
}
/**
* Get textual representation of device path for a handle
*
* @v handle EFI handle
* @ret text Textual representation of device path, or NULL
*/
const char * efi_handle_devpath_text ( EFI_HANDLE handle ) {
EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
union {
EFI_DEVICE_PATH_PROTOCOL *path;
void *interface;
} path;
const char *text;
EFI_STATUS efirc;
/* Obtain device path, if any */
if ( ( efirc = bs->OpenProtocol ( handle,
&efi_device_path_protocol_guid,
&path.interface, efi_image_handle,
handle,
EFI_OPEN_PROTOCOL_GET_PROTOCOL ))!=0){
return NULL;
}
/* Format device path */
text = efi_devpath_text ( path.path );
/* Close device path */
bs->CloseProtocol ( handle, &efi_device_path_protocol_guid,
efi_image_handle, handle );
return text;
}
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