2 * Copyright (C) 2014 Michael Brown <mbrown@fensystems.co.uk>.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License as
6 * published by the Free Software Foundation; either version 2 of the
7 * License, or any later version.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
19 * You can also choose to distribute this program under the terms of
20 * the Unmodified Binary Distribution Licence (as given in the file
21 * COPYING.UBDL), provided that you have satisfied its requirements.
24 FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
28 #include <ipxe/init.h>
29 #include <ipxe/efi/efi.h>
30 #include <ipxe/efi/efi_driver.h>
31 #include <ipxe/efi/efi_utils.h>
32 #include <ipxe/efi/Protocol/SimpleNetwork.h>
33 #include <ipxe/efi/Protocol/NetworkInterfaceIdentifier.h>
39 * EFI chainloaded-device-only driver
43 /** A chainloaded protocol */
44 struct chained_protocol {
48 * Protocol instance installed on the loaded image's device handle
50 * We match against the protocol instance (rather than simply
51 * matching against the device handle itself) because some
52 * systems load us via a child of the underlying device, with
53 * a duplicate protocol installed on the child handle.
58 /** Chainloaded SNP protocol */
59 static struct chained_protocol chained_snp = {
60 .protocol = &efi_simple_network_protocol_guid,
63 /** Chainloaded NII protocol */
64 static struct chained_protocol chained_nii = {
65 .protocol = &efi_nii31_protocol_guid,
69 * Locate chainloaded protocol instance
71 * @v chained Chainloaded protocol
72 * @ret rc Return status code
74 static int chained_locate ( struct chained_protocol *chained ) {
75 EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
76 EFI_HANDLE device = efi_loaded_image->DeviceHandle;
81 /* Locate handle supporting this protocol */
82 if ( ( rc = efi_locate_device ( device, chained->protocol,
84 DBGC ( device, "CHAINED %p %s does not support %s: %s\n",
85 device, efi_handle_name ( device ),
86 efi_guid_ntoa ( chained->protocol ), strerror ( rc ) );
87 goto err_locate_device;
89 DBGC ( device, "CHAINED %p %s found %s on ", device,
90 efi_handle_name ( device ), efi_guid_ntoa ( chained->protocol ));
91 DBGC ( device, "%p %s\n", parent, efi_handle_name ( parent ) );
93 /* Get protocol instance */
94 if ( ( efirc = bs->OpenProtocol ( parent, chained->protocol,
95 &chained->interface, efi_image_handle,
97 EFI_OPEN_PROTOCOL_GET_PROTOCOL ))!=0){
99 DBGC ( device, "CHAINED %p %s could not open %s on ",
100 device, efi_handle_name ( device ),
101 efi_guid_ntoa ( chained->protocol ) );
102 DBGC ( device, "%p %s: %s\n",
103 parent, efi_handle_name ( parent ), strerror ( rc ) );
104 goto err_open_protocol;
108 bs->CloseProtocol ( parent, chained->protocol, efi_image_handle,
115 * Check to see if driver supports a device
117 * @v device EFI device handle
118 * @v chained Chainloaded protocol
119 * @ret rc Return status code
121 static int chained_supported ( EFI_HANDLE device,
122 struct chained_protocol *chained ) {
123 EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
129 if ( ( efirc = bs->OpenProtocol ( device, chained->protocol, &interface,
130 efi_image_handle, device,
131 EFI_OPEN_PROTOCOL_GET_PROTOCOL ))!=0){
132 rc = -EEFI ( efirc );
133 DBGCP ( device, "CHAINED %p %s is not a %s device\n",
134 device, efi_handle_name ( device ),
135 efi_guid_ntoa ( chained->protocol ) );
136 goto err_open_protocol;
139 /* Test for a match against the chainloading device */
140 if ( interface != chained->interface ) {
141 DBGC ( device, "CHAINED %p %s %p is not the chainloaded "
142 "%s\n", device, efi_handle_name ( device ),
143 interface, efi_guid_ntoa ( chained->protocol ) );
150 DBGC ( device, "CHAINED %p %s %p is the chainloaded %s\n",
151 device, efi_handle_name ( device ), interface,
152 efi_guid_ntoa ( chained->protocol ) );
155 bs->CloseProtocol ( device, chained->protocol, efi_image_handle,
162 * Check to see if driver supports a device
164 * @v device EFI device handle
165 * @ret rc Return status code
167 static int snponly_supported ( EFI_HANDLE device ) {
169 return chained_supported ( device, &chained_snp );
173 * Check to see if driver supports a device
175 * @v device EFI device handle
176 * @ret rc Return status code
178 static int niionly_supported ( EFI_HANDLE device ) {
180 return chained_supported ( device, &chained_nii );
183 /** EFI SNP chainloading-device-only driver */
184 struct efi_driver snponly_driver __efi_driver ( EFI_DRIVER_NORMAL ) = {
186 .supported = snponly_supported,
187 .start = snpnet_start,
191 /** EFI NII chainloading-device-only driver */
192 struct efi_driver niionly_driver __efi_driver ( EFI_DRIVER_NORMAL ) = {
194 .supported = niionly_supported,
200 * Initialise EFI chainloaded-device-only driver
203 static void chained_init ( void ) {
205 chained_locate ( &chained_snp );
206 chained_locate ( &chained_nii );
209 /** EFI chainloaded-device-only initialisation function */
210 struct init_fn chained_init_fn __init_fn ( INIT_LATE ) = {
211 .initialise = chained_init,