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/*
* Copyright (C) 2025 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.
*
* You can also choose to distribute this program under the terms of
* the Unmodified Binary Distribution Licence (as given in the file
* COPYING.UBDL), provided that you have satisfied its requirements.
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
FILE_SECBOOT ( PERMITTED );
/** @file
*
* EFI driver connection and disconnection
*
*/
#include <errno.h>
#include <string.h>
#include <ipxe/efi/efi.h>
/* Disambiguate the various error causes */
#define EINFO_EEFI_CONNECT \
__einfo_uniqify ( EINFO_EPLATFORM, 0x01, \
"Could not connect controllers" )
#define EINFO_EEFI_CONNECT_PROHIBITED \
__einfo_platformify ( EINFO_EEFI_CONNECT, \
EFI_SECURITY_VIOLATION, \
"Connecting controllers prohibited by " \
"security policy" )
#define EEFI_CONNECT_PROHIBITED \
__einfo_error ( EINFO_EEFI_CONNECT_PROHIBITED )
#define EEFI_CONNECT( efirc ) EPLATFORM ( EINFO_EEFI_CONNECT, efirc, \
EEFI_CONNECT_PROHIBITED )
/**
* Connect UEFI driver(s)
*
* @v device EFI device handle
* @v driver EFI driver handle, or NULL
* @ret rc Return status code
*/
int efi_connect ( EFI_HANDLE device, EFI_HANDLE driver ) {
EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
EFI_HANDLE driverlist[2] = { driver, NULL };
EFI_HANDLE *drivers = ( driver ? driverlist : NULL );
EFI_STATUS efirc;
int rc;
/* Attempt connection at external TPL */
DBGC ( device, "EFI %s connecting ", efi_handle_name ( device ) );
DBGC ( device, "%s driver at %s TPL\n",
( driver ? efi_handle_name ( driver ) : "any" ),
efi_tpl_name ( efi_external_tpl ) );
bs->RestoreTPL ( efi_external_tpl );
efirc = bs->ConnectController ( device, drivers, NULL, TRUE );
bs->RaiseTPL ( efi_internal_tpl );
if ( efirc != 0 ) {
rc = -EEFI_CONNECT ( efirc );
DBGC ( device, "EFI %s could not connect: %s\n",
efi_handle_name ( device ), strerror ( rc ) );
return rc;
}
return 0;
}
/**
* Disconnect UEFI driver(s)
*
* @v device EFI device handle
* @v driver EFI driver handle, or NULL
* @ret rc Return status code
*/
int efi_disconnect ( EFI_HANDLE device, EFI_HANDLE driver ) {
EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
EFI_STATUS efirc;
int rc;
/* Attempt disconnection at external TPL */
DBGC ( device, "EFI %s disconnecting ", efi_handle_name ( device ) );
DBGC ( device, "%s driver at %s TPL\n",
( driver ? efi_handle_name ( driver ) : "any" ),
efi_tpl_name ( efi_external_tpl ) );
bs->RestoreTPL ( efi_external_tpl );
efirc = bs->DisconnectController ( device, driver, NULL );
bs->RaiseTPL ( efi_internal_tpl );
if ( ( efirc != 0 ) && ( efirc != EFI_NOT_FOUND ) ) {
rc = -EEFI ( efirc );
DBGC ( device, "EFI %s could not disconnect: %s\n",
efi_handle_name ( device ), strerror ( rc ) );
return rc;
}
return 0;
}
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