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/*
* Copyright (C) 2011 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 );
#include <stddef.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <ipxe/efi/efi.h>
#include <ipxe/efi/Protocol/DriverBinding.h>
#include <ipxe/efi/Protocol/ComponentName2.h>
#include <ipxe/efi/efi_strings.h>
#include <ipxe/efi/efi_driver.h>
#include <config/general.h>
/** @file
*
* EFI driver interface
*
*/
/** EFI driver binding protocol GUID */
static EFI_GUID efi_driver_binding_protocol_guid
= EFI_DRIVER_BINDING_PROTOCOL_GUID;
/** EFI component name protocol GUID */
static EFI_GUID efi_component_name2_protocol_guid
= EFI_COMPONENT_NAME2_PROTOCOL_GUID;
/**
* Find end of device path
*
* @v path Path to device
* @ret path_end End of device path
*/
EFI_DEVICE_PATH_PROTOCOL * efi_devpath_end ( EFI_DEVICE_PATH_PROTOCOL *path ) {
while ( path->Type != END_DEVICE_PATH_TYPE ) {
path = ( ( ( void * ) path ) +
/* There's this amazing new-fangled thing known as
* a UINT16, but who wants to use one of those? */
( ( path->Length[1] << 8 ) | path->Length[0] ) );
}
return path;
}
/**
* Look up driver name
*
* @v wtf Component name protocol
* @v language Language to use
* @v driver_name Driver name to fill in
* @ret efirc EFI status code
*/
static EFI_STATUS EFIAPI
efi_driver_get_driver_name ( EFI_COMPONENT_NAME2_PROTOCOL *wtf,
CHAR8 *language __unused, CHAR16 **driver_name ) {
struct efi_driver *efidrv =
container_of ( wtf, struct efi_driver, wtf );
*driver_name = efidrv->wname;
return 0;
}
/**
* Look up controller name
*
* @v wtf Component name protocol
* @v device Device
* @v child Child device, or NULL
* @v language Language to use
* @v driver_name Device name to fill in
* @ret efirc EFI status code
*/
static EFI_STATUS EFIAPI
efi_driver_get_controller_name ( EFI_COMPONENT_NAME2_PROTOCOL *wtf __unused,
EFI_HANDLE device, EFI_HANDLE child,
CHAR8 *language, CHAR16 **controller_name ) {
EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
union {
EFI_COMPONENT_NAME2_PROTOCOL *name2;
void *interface;
} name2;
EFI_STATUS efirc;
/* Delegate to the EFI_COMPONENT_NAME2_PROTOCOL instance
* installed on child handle, if present.
*/
if ( ( child != NULL ) &&
( ( efirc = bs->OpenProtocol (
child, &efi_component_name2_protocol_guid,
&name2.interface, NULL, NULL,
EFI_OPEN_PROTOCOL_GET_PROTOCOL ) ) == 0 ) ) {
return name2.name2->GetControllerName ( name2.name2, device,
child, language,
controller_name );
}
/* Otherwise, let EFI use the default Device Path Name */
return EFI_UNSUPPORTED;
}
/**
* Install EFI driver
*
* @v efidrv EFI driver
* @ret rc Return status code
*/
int efi_driver_install ( struct efi_driver *efidrv ) {
EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
EFI_DRIVER_BINDING_PROTOCOL *driver = &efidrv->driver;
EFI_COMPONENT_NAME2_PROTOCOL *wtf = &efidrv->wtf;
EFI_STATUS efirc;
int rc;
/* Configure driver binding protocol */
driver->ImageHandle = efi_image_handle;
/* Configure component name protocol */
wtf->GetDriverName = efi_driver_get_driver_name;
wtf->GetControllerName = efi_driver_get_controller_name;
wtf->SupportedLanguages = "en";
/* Fill in driver name */
efi_snprintf ( efidrv->wname,
( sizeof ( efidrv->wname ) /
sizeof ( efidrv->wname[0] ) ),
PRODUCT_SHORT_NAME "%s%s",
( efidrv->name ? " - " : "" ),
( efidrv->name ? efidrv->name : "" ) );
/* Install driver */
if ( ( efirc = bs->InstallMultipleProtocolInterfaces (
&driver->DriverBindingHandle,
&efi_driver_binding_protocol_guid, driver,
&efi_component_name2_protocol_guid, wtf,
NULL ) ) != 0 ) {
rc = -EEFI ( efirc );
DBGC ( efidrv, "EFIDRV %s could not install protocol: %s\n",
efidrv->name, strerror ( rc ) );
return rc;
}
DBGC ( efidrv, "EFIDRV %s installed\n", efidrv->name );
return 0;
}
/**
* Uninstall EFI driver
*
* @v efidrv EFI driver
*/
void efi_driver_uninstall ( struct efi_driver *efidrv ) {
EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
EFI_HANDLE *handles;
UINTN num_handles;
EFI_STATUS efirc;
UINTN i;
int rc;
/* Disconnect the driver from its devices */
if ( ( efirc = bs->LocateHandleBuffer ( AllHandles, NULL, NULL,
&num_handles,
&handles ) ) != 0 ) {
rc = -EEFI ( efirc );
DBGC ( efidrv, "EFIDRV %s could not list handles: %s\n",
efidrv->name, strerror ( rc ) );
/* No way to disconnect driver; leave it loaded */
return;
}
DBGC ( efidrv, "EFIDRV %s disconnecting devices\n", efidrv->name );
for ( i = 0 ; i < num_handles ; i++ ) {
bs->DisconnectController ( handles[i],
efidrv->driver.DriverBindingHandle,
NULL );
}
bs->FreePool ( handles );
/* Uninstall the driver */
bs->UninstallMultipleProtocolInterfaces (
efidrv->driver.DriverBindingHandle,
&efi_driver_binding_protocol_guid, &efidrv->driver,
&efi_component_name2_protocol_guid, &efidrv->wtf,
NULL );
DBGC ( efidrv, "EFIDRV %s uninstalled\n", efidrv->name );
}
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