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Annotation of qemu/roms/ipxe/src/drivers/net/efi/snponly.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (C) 2010 VMware, Inc.  All Rights Reserved.
                      3:  *
                      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.
                      8:  *
                      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.
                     13:  *
                     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 St, Fifth Floor, Boston, MA 02110-1301 USA.
                     17:  */
                     18: 
                     19: FILE_LICENCE ( GPL2_OR_LATER );
                     20: 
                     21: #include <string.h>
                     22: #include <errno.h>
                     23: #include <ipxe/device.h>
                     24: #include <ipxe/init.h>
                     25: #include <ipxe/efi/efi.h>
                     26: #include <ipxe/efi/Protocol/SimpleNetwork.h>
                     27: #include "snp.h"
                     28: #include "snpnet.h"
                     29: 
                     30: /** @file
                     31:  *
                     32:  * Chain-loading Simple Network Protocol Bus Driver
                     33:  *
                     34:  * This bus driver allows iPXE to use the EFI Simple Network Protocol provided
                     35:  * by the platform to transmit and receive packets. It attaches to only the
                     36:  * device handle that iPXE was loaded from, that is, it will only use the
                     37:  * Simple Network Protocol on the current loaded image's device handle.
                     38:  *
                     39:  * Eseentially, this driver provides the EFI equivalent of the "undionly"
                     40:  * driver.
                     41:  */
                     42: 
                     43: /** The one and only SNP network device */
                     44: static struct snp_device snponly_dev;
                     45: 
                     46: /** EFI simple network protocol GUID */
                     47: static EFI_GUID efi_simple_network_protocol_guid
                     48:        = EFI_SIMPLE_NETWORK_PROTOCOL_GUID;
                     49: 
                     50: /**
                     51:  * Probe SNP root bus
                     52:  *
                     53:  * @v rootdev          SNP bus root device
                     54:  *
                     55:  * Look at the loaded image's device handle and see if the simple network
                     56:  * protocol exists. If so, register a driver for it.
                     57:  */
                     58: static int snpbus_probe ( struct root_device *rootdev ) {
                     59:        EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
                     60:        EFI_STATUS efirc;
                     61:        int rc;
                     62:        void *snp;
                     63: 
                     64:        efirc = bs->OpenProtocol ( efi_loaded_image->DeviceHandle,
                     65:                                   &efi_simple_network_protocol_guid,
                     66:                                   &snp, efi_image_handle, NULL,
                     67:                                   EFI_OPEN_PROTOCOL_GET_PROTOCOL );
                     68:        if ( efirc ) {
                     69:                DBG ( "Could not find Simple Network Protocol!\n" );
                     70:                return -ENODEV;
                     71:        }
                     72:        snponly_dev.snp = snp;
                     73: 
                     74:        /* Add to device hierarchy */
                     75:        strncpy ( snponly_dev.dev.name, "EFI SNP",
                     76:                  ( sizeof ( snponly_dev.dev.name ) - 1 ) );
                     77:        snponly_dev.dev.parent = &rootdev->dev;
                     78:        list_add ( &snponly_dev.dev.siblings, &rootdev->dev.children);
                     79:        INIT_LIST_HEAD ( &snponly_dev.dev.children );
                     80: 
                     81:        /* Create network device */
                     82:        if ( ( rc = snpnet_probe ( &snponly_dev ) ) != 0 )
                     83:                goto err;
                     84: 
                     85:        return 0;
                     86: 
                     87: err:
                     88:        list_del ( &snponly_dev.dev.siblings );
                     89:        return rc;
                     90: }
                     91: 
                     92: /**
                     93:  * Remove SNP root bus
                     94:  *
                     95:  * @v rootdev          SNP bus root device
                     96:  */
                     97: static void snpbus_remove ( struct root_device *rootdev __unused ) {
                     98:        snpnet_remove ( &snponly_dev );
                     99:        list_del ( &snponly_dev.dev.siblings );
                    100: }
                    101: 
                    102: /** SNP bus root device driver */
                    103: static struct root_driver snp_root_driver = {
                    104:        .probe = snpbus_probe,
                    105:        .remove = snpbus_remove,
                    106: };
                    107: 
                    108: /** SNP bus root device */
                    109: struct root_device snp_root_device __root_device = {
                    110:        .dev = { .name = "EFI SNP" },
                    111:        .driver = &snp_root_driver,
                    112: };
                    113: 
                    114: /**
                    115:  * Prepare for exit
                    116:  *
                    117:  * @v booting          System is shutting down for OS boot
                    118:  */
                    119: static void snponly_shutdown ( int booting ) {
                    120:        /* If we are shutting down to boot an OS, make sure the SNP does not
                    121:         * stay active.
                    122:         */
                    123:        if ( booting )
                    124:                snponly_dev.removal_state = EfiSimpleNetworkStopped;
                    125: }
                    126: 
                    127: struct startup_fn startup_snponly __startup_fn ( STARTUP_LATE ) = {
                    128:        .shutdown = snponly_shutdown,
                    129: };

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