/*
* Copyright (C) 2014 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 );
#include <string.h>
#include <errno.h>
#include <ipxe/init.h>
#include <ipxe/efi/efi.h>
#include <ipxe/efi/efi_driver.h>
#include <ipxe/efi/efi_utils.h>
#include <ipxe/efi/Protocol/SimpleNetwork.h>
#include <ipxe/efi/Protocol/NetworkInterfaceIdentifier.h>
#include "snpnet.h"
#include "nii.h"
/** @file
*
* EFI chainloaded-device-only driver
*
*/
/** A chainloaded protocol */
struct chained_protocol {
/** Protocol GUID */
EFI_GUID *protocol;
/**
* Protocol instance installed on the loaded image's device handle
*
* We match against the protocol instance (rather than simply
* matching against the device handle itself) because some
* systems load us via a child of the underlying device, with
* a duplicate protocol installed on the child handle.
*/
void *interface;
};
/** Chainloaded SNP protocol */
static struct chained_protocol chained_snp = {
.protocol = &efi_simple_network_protocol_guid,
};
/** Chainloaded NII protocol */
static struct chained_protocol chained_nii = {
.protocol = &efi_nii31_protocol_guid,
};
/**
* Locate chainloaded protocol instance
*
* @v chained Chainloaded protocol
* @ret rc Return status code
*/
static int chained_locate ( struct chained_protocol *chained ) {
EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
EFI_HANDLE device = efi_loaded_image->DeviceHandle;
EFI_HANDLE parent;
EFI_STATUS efirc;
int rc;
/* Locate handle supporting this protocol */
if ( ( rc = efi_locate_device ( device, chained->protocol,
&parent, 0 ) ) != 0 ) {
DBGC ( device, "CHAINED %s does not support %s: %s\n",
efi_handle_name ( device ),
efi_guid_ntoa ( chained->protocol ), strerror ( rc ) );
goto err_locate_device;
}
DBGC ( device, "CHAINED %s found %s on ", efi_handle_name ( device ),
efi_guid_ntoa ( chained->protocol ) );
DBGC ( device, "%s\n", efi_handle_name ( parent ) );
/* Get protocol instance */
if ( ( efirc = bs->OpenProtocol ( parent, chained->protocol,
&chained->interface, efi_image_handle,
device,
EFI_OPEN_PROTOCOL_GET_PROTOCOL ))!=0){
rc = -EEFI ( efirc );
DBGC ( device, "CHAINED %s could not open %s on ",
efi_handle_name ( device ),
efi_guid_ntoa ( chained->protocol ) );
DBGC ( device, "%s: %s\n",
efi_handle_name ( parent ), strerror ( rc ) );
goto err_open_protocol;
}
err_locate_device:
bs->CloseProtocol ( parent, chained->protocol, efi_image_handle,
device );
err_open_protocol:
return rc;
}
/**
* Check to see if driver supports a device
*
* @v device EFI device handle
* @v chained Chainloaded protocol
* @ret rc Return status code
*/
static int chained_supported ( EFI_HANDLE device,
struct chained_protocol *chained ) {
EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
EFI_STATUS efirc;
void *interface;
int rc;
/* Get protocol */
if ( ( efirc = bs->OpenProtocol ( device, chained->protocol, &interface,
efi_image_handle, device,
EFI_OPEN_PROTOCOL_GET_PROTOCOL ))!=0){
rc = -EEFI ( efirc );
DBGCP ( device, "CHAINED %s is not a %s device\n",
efi_handle_name ( device ),
efi_guid_ntoa ( chained->protocol ) );
goto err_open_protocol;
}
/* Test for a match against the chainloading device */
if ( interface != chained->interface ) {
DBGC ( device, "CHAINED %s %p is not the chainloaded %s\n",
efi_handle_name ( device ), interface,
efi_guid_ntoa ( chained->protocol ) );
rc = -ENOTTY;
goto err_no_match;
}
/* Success */
rc = 0;
DBGC ( device, "CHAINED %s %p is the chainloaded %s\n",
efi_handle_name ( device ), interface,
efi_guid_ntoa ( chained->protocol ) );
err_no_match:
bs->CloseProtocol ( device, chained->protocol, efi_image_handle,
device );
err_open_protocol:
return rc;
}
/**
* Check to see if driver supports a device
*
* @v device EFI device handle
* @ret rc Return status code
*/
static int snponly_supported ( EFI_HANDLE device ) {
return chained_supported ( device, &chained_snp );
}
/**
* Check to see if driver supports a device
*
* @v device EFI device handle
* @ret rc Return status code
*/
static int niionly_supported ( EFI_HANDLE device ) {
return chained_supported ( device, &chained_nii );
}
/** EFI SNP chainloading-device-only driver */
struct efi_driver snponly_driver __efi_driver ( EFI_DRIVER_NORMAL ) = {
.name = "SNPONLY",
.supported = snponly_supported,
.start = snpnet_start,
.stop = snpnet_stop,
};
/** EFI NII chainloading-device-only driver */
struct efi_driver niionly_driver __efi_driver ( EFI_DRIVER_NORMAL ) = {
.name = "NIIONLY",
.supported = niionly_supported,
.start = nii_start,
.stop = nii_stop,
};
/**
* Initialise EFI chainloaded-device-only driver
*
*/
static void chained_init ( void ) {
chained_locate ( &chained_snp );
chained_locate ( &chained_nii );
}
/** EFI chainloaded-device-only initialisation function */
struct init_fn chained_init_fn __init_fn ( INIT_LATE ) = {
.initialise = chained_init,
};
