/*
* 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.
*/
FILE_LICENCE ( GPL2_OR_LATER );
#include <errno.h>
#include <ipxe/init.h>
#include <ipxe/efi/efi.h>
#include <ipxe/efi/efi_driver.h>
#include <ipxe/efi/Protocol/SimpleNetwork.h>
#include "snpnet.h"
/** @file
*
* SNP chainloading-device-only driver
*
*/
/**
* SNP protocol instance installed on the loaded image's device handle
*
* We match against the SNP protocol instance (rather than simply
* matching against the device handle itself) because some systems
* load us via a child of the SNP device, with a duplicate SNP
* protocol installed on the child handle.
*/
static EFI_SIMPLE_NETWORK_PROTOCOL *snponly;
/**
* 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 ) {
EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
EFI_STATUS efirc;
union {
EFI_SIMPLE_NETWORK_PROTOCOL *snp;
void *interface;
} snp;
int rc;
/* Get SNP protocol */
if ( ( efirc = bs->OpenProtocol ( device,
&efi_simple_network_protocol_guid,
&snp.interface, efi_image_handle,
device,
EFI_OPEN_PROTOCOL_GET_PROTOCOL ))!=0){
rc = -EEFI ( efirc );
DBGCP ( device, "SNPONLY %p %s is not an SNP device\n",
device, efi_handle_name ( device ) );
goto err_not_snp;
}
/* Test for a match against the chainloading device */
if ( snp.snp != snponly ) {
DBGC ( device, "SNPONLY %p %s SNP %p is not the "
"chainloading SNP\n", device,
efi_handle_name ( device ), snp.snp );
rc = -ENOTTY;
goto err_not_snponly;
}
/* Success */
rc = 0;
DBGC ( device, "SNPONLY %p %s SNP %p is the chainloading SNP\n",
device, efi_handle_name ( device ), snp.snp );
err_not_snponly:
bs->CloseProtocol ( device, &efi_simple_network_protocol_guid,
efi_image_handle, device );
err_not_snp:
return rc;
}
/** EFI 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,
};
/**
* Initialise EFI chainloading-device-only driver
*
*/
static void snponly_init ( void ) {
EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
EFI_HANDLE device = efi_loaded_image->DeviceHandle;
union {
EFI_SIMPLE_NETWORK_PROTOCOL *snp;
void *interface;
} snp;
EFI_STATUS efirc;
/* Look for SNP protocol on the loaded image's device handle */
if ( ( efirc = bs->OpenProtocol ( device,
&efi_simple_network_protocol_guid,
&snp.interface, efi_image_handle,
device,
EFI_OPEN_PROTOCOL_GET_PROTOCOL ))!=0){
DBGC ( device, "SNPONLY %p %s is not an SNP device\n",
device, efi_handle_name ( device ) );
goto err_open_protocol;
}
/* Record SNP protocol instance */
snponly = snp.snp;
DBGC ( device, "SNPONLY %p %s found chainloading SNP %p\n",
device, efi_handle_name ( device ), snponly );
err_open_protocol:
bs->CloseProtocol ( device, &efi_simple_network_protocol_guid,
efi_image_handle, device );
}
/** EFI chainloading-device-only initialisation function */
struct init_fn snponly_init_fn __init_fn ( INIT_LATE ) = {
.initialise = snponly_init,
};
