efi_null.c

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/*
 * Copyright (C) 2020 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 (at your option) 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 <ipxe/efi/efi.h>
#include <ipxe/efi/efi_null.h>

/** @file
 *
 * EFI null interfaces
 *
 */

/******************************************************************************
 *
 * Simple Network Protocol
 *
 ******************************************************************************
 */

static EFI_STATUS EFIAPI
efi_null_snp_start ( EFI_SIMPLE_NETWORK_PROTOCOL *snp __unused ) {
        return EFI_UNSUPPORTED;
}

static EFI_STATUS EFIAPI
efi_null_snp_stop ( EFI_SIMPLE_NETWORK_PROTOCOL *snp __unused ) {
        return EFI_UNSUPPORTED;
}

static EFI_STATUS EFIAPI
efi_null_snp_initialize ( EFI_SIMPLE_NETWORK_PROTOCOL *snp __unused,
                          UINTN extra_rx_bufsize __unused,
                          UINTN extra_tx_bufsize __unused ) {
        return EFI_UNSUPPORTED;
}

static EFI_STATUS EFIAPI
efi_null_snp_reset ( EFI_SIMPLE_NETWORK_PROTOCOL *snp __unused,
                     BOOLEAN ext_verify __unused ) {
        return EFI_UNSUPPORTED;
}

static EFI_STATUS EFIAPI
efi_null_snp_shutdown ( EFI_SIMPLE_NETWORK_PROTOCOL *snp __unused ) {
        return EFI_UNSUPPORTED;
}

static EFI_STATUS EFIAPI
efi_null_snp_receive_filters ( EFI_SIMPLE_NETWORK_PROTOCOL *snp __unused,
                               UINT32 enable __unused,
                               UINT32 disable __unused,
                               BOOLEAN mcast_reset __unused,
                               UINTN mcast_count __unused,
                               EFI_MAC_ADDRESS *mcast __unused ) {
        return EFI_UNSUPPORTED;
}

static EFI_STATUS EFIAPI
efi_null_snp_station_address ( EFI_SIMPLE_NETWORK_PROTOCOL *snp __unused,
                               BOOLEAN reset __unused,
                               EFI_MAC_ADDRESS *new __unused ) {
        return EFI_UNSUPPORTED;
}

static EFI_STATUS EFIAPI
efi_null_snp_statistics ( EFI_SIMPLE_NETWORK_PROTOCOL *snp __unused,
                          BOOLEAN reset __unused, UINTN *stats_len __unused,
                          EFI_NETWORK_STATISTICS *stats __unused ) {
        return EFI_UNSUPPORTED;
}

static EFI_STATUS EFIAPI
efi_null_snp_mcast_ip_to_mac ( EFI_SIMPLE_NETWORK_PROTOCOL *snp __unused,
                               BOOLEAN ipv6 __unused,
                               EFI_IP_ADDRESS *ip __unused,
                               EFI_MAC_ADDRESS *mac __unused ) {
        return EFI_UNSUPPORTED;
}

static EFI_STATUS EFIAPI
efi_null_snp_nvdata ( EFI_SIMPLE_NETWORK_PROTOCOL *snp __unused,
                      BOOLEAN read __unused, UINTN offset __unused,
                      UINTN len __unused, VOID *data __unused ) {
        return EFI_UNSUPPORTED;
}

static EFI_STATUS EFIAPI
efi_null_snp_get_status ( EFI_SIMPLE_NETWORK_PROTOCOL *snp __unused,
                          UINT32 *interrupts __unused, VOID **txbuf __unused ) {
        return EFI_UNSUPPORTED;
}

static EFI_STATUS EFIAPI
efi_null_snp_transmit ( EFI_SIMPLE_NETWORK_PROTOCOL *snp __unused,
                        UINTN ll_header_len __unused, UINTN len __unused,
                        VOID *data __unused, EFI_MAC_ADDRESS *ll_src __unused,
                        EFI_MAC_ADDRESS *ll_dest __unused,
                        UINT16 *net_proto __unused ) {
        return EFI_UNSUPPORTED;
}

static EFI_STATUS EFIAPI
efi_null_snp_receive ( EFI_SIMPLE_NETWORK_PROTOCOL *snp __unused,
                       UINTN *ll_header_len __unused, UINTN *len __unused,
                       VOID *data __unused, EFI_MAC_ADDRESS *ll_src __unused,
                       EFI_MAC_ADDRESS *ll_dest __unused,
                       UINT16 *net_proto __unused ) {
        return EFI_UNSUPPORTED;
}

static EFI_SIMPLE_NETWORK_PROTOCOL efi_null_snp = {
        .Revision       = EFI_SIMPLE_NETWORK_PROTOCOL_REVISION,
        .Start          = efi_null_snp_start,
        .Stop           = efi_null_snp_stop,
        .Initialize     = efi_null_snp_initialize,
        .Reset          = efi_null_snp_reset,
        .Shutdown       = efi_null_snp_shutdown,
        .ReceiveFilters = efi_null_snp_receive_filters,
        .StationAddress = efi_null_snp_station_address,
        .Statistics     = efi_null_snp_statistics,
        .MCastIpToMac   = efi_null_snp_mcast_ip_to_mac,
        .NvData         = efi_null_snp_nvdata,
        .GetStatus      = efi_null_snp_get_status,
        .Transmit       = efi_null_snp_transmit,
        .Receive        = efi_null_snp_receive,
};

/**
 * Nullify SNP interface
 *
 * @v snp               SNP interface
 */
void efi_nullify_snp ( EFI_SIMPLE_NETWORK_PROTOCOL *snp ) {

        memcpy ( snp, &efi_null_snp,
                 offsetof ( typeof ( *snp ), WaitForPacket ) );
        snp->Mode->State = EfiSimpleNetworkStopped;
}

/******************************************************************************
 *
 * Network Interface Identification protocol
 *
 ******************************************************************************
 */

static EFIAPI VOID efi_null_undi_issue ( UINT64 cdb_phys ) {
        PXE_CDB *cdb = ( ( void * ) ( intptr_t ) cdb_phys );

        cdb->StatCode = PXE_STATCODE_UNSUPPORTED;
        cdb->StatFlags = PXE_STATFLAGS_COMMAND_FAILED;
}

static PXE_SW_UNDI efi_null_undi __attribute__ (( aligned ( 16 ) )) = {
        .Signature      = PXE_ROMID_SIGNATURE,
        .Len            = sizeof ( efi_null_undi ),
        .Rev            = PXE_ROMID_REV,
        .MajorVer       = PXE_ROMID_MAJORVER,
        .MinorVer       = PXE_ROMID_MINORVER,
        .Implementation = PXE_ROMID_IMP_SW_VIRT_ADDR,
};

/**
 * Nullify NII interface
 *
 * @v nii               NII interface
 */
void efi_nullify_nii ( EFI_NETWORK_INTERFACE_IDENTIFIER_PROTOCOL *nii ) {
        efi_null_undi.EntryPoint = ( ( intptr_t ) efi_null_undi_issue );
        nii->Id = ( ( intptr_t ) &efi_null_undi );
}

/******************************************************************************
 *
 * VLAN configuration protocol
 *
 ******************************************************************************
 */

static EFI_STATUS EFIAPI
efi_null_vlan_set ( EFI_VLAN_CONFIG_PROTOCOL *vcfg __unused,
                    UINT16 tag __unused, UINT8 priority __unused ) {
        return EFI_UNSUPPORTED;
}

static EFI_STATUS EFIAPI
efi_null_vlan_find ( EFI_VLAN_CONFIG_PROTOCOL *vcfg __unused,
                     UINT16 *filter __unused, UINT16 *count __unused,
                     EFI_VLAN_FIND_DATA **entries __unused ) {
        return EFI_UNSUPPORTED;
}

static EFI_STATUS EFIAPI
efi_null_vlan_remove ( EFI_VLAN_CONFIG_PROTOCOL *vcfg __unused,
                       UINT16 tag __unused ) {
        return EFI_UNSUPPORTED;
}

static EFI_VLAN_CONFIG_PROTOCOL efi_null_vlan = {
        .Set            = efi_null_vlan_set,
        .Find           = efi_null_vlan_find,
        .Remove         = efi_null_vlan_remove,
};

/**
 * Nullify VLAN configuration interface
 *
 * @v vcfg              VLAN configuration protocol
 */
void efi_nullify_vlan ( EFI_VLAN_CONFIG_PROTOCOL *vcfg ) {

        memcpy ( vcfg, &efi_null_vlan, sizeof ( *vcfg ) );
}

/******************************************************************************
 *
 * Component name protocol
 *
 ******************************************************************************
 */

static EFI_STATUS EFIAPI
efi_null_get_driver_name ( EFI_COMPONENT_NAME2_PROTOCOL *name2 __unused,
                           CHAR8 *language __unused,
                           CHAR16 **driver_name __unused ) {
        return EFI_UNSUPPORTED;
}

static EFI_STATUS EFIAPI
efi_null_get_controller_name ( EFI_COMPONENT_NAME2_PROTOCOL *name2 __unused,
                               EFI_HANDLE device __unused,
                               EFI_HANDLE child __unused,
                               CHAR8 *language __unused,
                               CHAR16 **controller_name __unused ) {
        return EFI_UNSUPPORTED;
}

static EFI_COMPONENT_NAME2_PROTOCOL efi_null_name2 = {
        .GetDriverName = efi_null_get_driver_name,
        .GetControllerName = efi_null_get_controller_name,
        .SupportedLanguages = "",
};

/**
 * Nullify Component Name Protocol interface
 *
 * @v name2             Component name protocol
 */
void efi_nullify_name2 ( EFI_COMPONENT_NAME2_PROTOCOL *name2 ) {

        memcpy ( name2, &efi_null_name2, sizeof ( *name2 ) );
}

/******************************************************************************
 *
 * Load file protocol
 *
 ******************************************************************************
 */

static EFI_STATUS EFIAPI
efi_null_load_file ( EFI_LOAD_FILE_PROTOCOL *load_file __unused,
                     EFI_DEVICE_PATH_PROTOCOL *path __unused,
                     BOOLEAN booting __unused, UINTN *len __unused,
                     VOID *data __unused ) {
        return EFI_UNSUPPORTED;
}

/**
 * Nullify Load File Protocol interface
 *
 * @v load_file         Load file protocol
 */
void efi_nullify_load_file ( EFI_LOAD_FILE_PROTOCOL *load_file ) {
        load_file->LoadFile = efi_null_load_file;
}

/******************************************************************************
 *
 * HII configuration access protocol
 *
 ******************************************************************************
 */

static EFI_STATUS EFIAPI
efi_null_hii_extract ( const EFI_HII_CONFIG_ACCESS_PROTOCOL *hii __unused,
                       EFI_STRING request __unused,
                       EFI_STRING *progress __unused,
                       EFI_STRING *results __unused ) {
        return EFI_UNSUPPORTED;
}

static EFI_STATUS EFIAPI
efi_null_hii_route ( const EFI_HII_CONFIG_ACCESS_PROTOCOL *hii __unused,
                     EFI_STRING config __unused,
                     EFI_STRING *progress __unused ) {
        return EFI_UNSUPPORTED;
}

static EFI_STATUS EFIAPI
efi_null_hii_callback ( const EFI_HII_CONFIG_ACCESS_PROTOCOL *hii __unused,
                        EFI_BROWSER_ACTION action __unused,
                        EFI_QUESTION_ID question_id __unused,
                        UINT8 type __unused, EFI_IFR_TYPE_VALUE *value __unused,
                        EFI_BROWSER_ACTION_REQUEST *action_request __unused ) {
        return EFI_UNSUPPORTED;
}

static EFI_HII_CONFIG_ACCESS_PROTOCOL efi_null_hii = {
        .ExtractConfig  = efi_null_hii_extract,
        .RouteConfig    = efi_null_hii_route,
        .Callback       = efi_null_hii_callback,
};

/**
 * Nullify HII configuration access protocol
 *
 * @v hii               HII configuration access protocol
 */
void efi_nullify_hii ( EFI_HII_CONFIG_ACCESS_PROTOCOL *hii ) {

        memcpy ( hii, &efi_null_hii, sizeof ( *hii ) );
}

/******************************************************************************
 *
 * Block I/O protocol
 *
 ******************************************************************************
 */

static EFI_STATUS EFIAPI
efi_null_block_reset ( EFI_BLOCK_IO_PROTOCOL *block __unused,
                       BOOLEAN verify __unused ) {
        return EFI_UNSUPPORTED;
}

static EFI_STATUS EFIAPI
efi_null_block_read ( EFI_BLOCK_IO_PROTOCOL *block __unused,
                      UINT32 media __unused, EFI_LBA lba __unused,
                      UINTN len __unused, VOID *data __unused ) {
        return EFI_UNSUPPORTED;
}

static EFI_STATUS EFIAPI
efi_null_block_write ( EFI_BLOCK_IO_PROTOCOL *block __unused,
                       UINT32 media __unused, EFI_LBA lba __unused,
                       UINTN len __unused, VOID *data __unused ) {
        return EFI_UNSUPPORTED;
}

static EFI_STATUS EFIAPI
efi_null_block_flush ( EFI_BLOCK_IO_PROTOCOL *block __unused ) {
        return EFI_UNSUPPORTED;
}

static EFI_BLOCK_IO_MEDIA efi_null_block_media;

static EFI_BLOCK_IO_PROTOCOL efi_null_block = {
        .Revision = EFI_BLOCK_IO_INTERFACE_REVISION,
        .Media = &efi_null_block_media,
        .Reset = efi_null_block_reset,
        .ReadBlocks = efi_null_block_read,
        .WriteBlocks = efi_null_block_write,
        .FlushBlocks = efi_null_block_flush,
};

/**
 * Nullify block I/O protocol
 *
 * @v block             Block I/O protocol
 */
void efi_nullify_block ( EFI_BLOCK_IO_PROTOCOL *block ) {

        memcpy ( block, &efi_null_block, sizeof ( *block ) );
}

/******************************************************************************
 *
 * PXE base code protocol
 *
 ******************************************************************************
 */

static EFI_STATUS EFIAPI
efi_null_pxe_start ( EFI_PXE_BASE_CODE_PROTOCOL *pxe __unused,
                     BOOLEAN use_ipv6 __unused ) {
        return EFI_UNSUPPORTED;
}

static EFI_STATUS EFIAPI
efi_null_pxe_stop ( EFI_PXE_BASE_CODE_PROTOCOL *pxe __unused ) {
        return EFI_UNSUPPORTED;
}

static EFI_STATUS EFIAPI
efi_null_pxe_dhcp ( EFI_PXE_BASE_CODE_PROTOCOL *pxe __unused,
                    BOOLEAN sort __unused ) {
        return EFI_UNSUPPORTED;
}

static EFI_STATUS EFIAPI
efi_null_pxe_discover ( EFI_PXE_BASE_CODE_PROTOCOL *pxe __unused,
                        UINT16 type __unused, UINT16 *layer __unused,
                        BOOLEAN bis __unused,
                        EFI_PXE_BASE_CODE_DISCOVER_INFO *info __unused ) {
        return EFI_UNSUPPORTED;
}

static EFI_STATUS EFIAPI
efi_null_pxe_mtftp ( EFI_PXE_BASE_CODE_PROTOCOL *pxe __unused,
                     EFI_PXE_BASE_CODE_TFTP_OPCODE opcode __unused,
                     VOID *data __unused, BOOLEAN overwrite __unused,
                     UINT64 *len __unused, UINTN *blksize __unused,
                     EFI_IP_ADDRESS *ip __unused, UINT8 *filename __unused,
                     EFI_PXE_BASE_CODE_MTFTP_INFO *info __unused,
                     BOOLEAN callback __unused ) {
        return EFI_UNSUPPORTED;
}

static EFI_STATUS EFIAPI
efi_null_pxe_udp_write ( EFI_PXE_BASE_CODE_PROTOCOL *pxe __unused,
                         UINT16 flags __unused,
                         EFI_IP_ADDRESS *dest_ip __unused,
                         EFI_PXE_BASE_CODE_UDP_PORT *dest_port __unused,
                         EFI_IP_ADDRESS *gateway __unused,
                         EFI_IP_ADDRESS *src_ip __unused,
                         EFI_PXE_BASE_CODE_UDP_PORT *src_port __unused,
                         UINTN *hdr_len __unused, VOID *hdr __unused,
                         UINTN *len __unused, VOID *data __unused ) {
        return EFI_UNSUPPORTED;
}

static EFI_STATUS EFIAPI
efi_null_pxe_udp_read ( EFI_PXE_BASE_CODE_PROTOCOL *pxe __unused,
                        UINT16 flags __unused,
                        EFI_IP_ADDRESS *dest_ip __unused,
                        EFI_PXE_BASE_CODE_UDP_PORT *dest_port __unused,
                        EFI_IP_ADDRESS *src_ip __unused,
                        EFI_PXE_BASE_CODE_UDP_PORT *src_port __unused,
                        UINTN *hdr_len __unused, VOID *hdr __unused,
                        UINTN *len __unused, VOID *data __unused ) {
        return EFI_UNSUPPORTED;
}

static EFI_STATUS EFIAPI
efi_null_pxe_set_ip_filter ( EFI_PXE_BASE_CODE_PROTOCOL *pxe __unused,
                             EFI_PXE_BASE_CODE_IP_FILTER *filter __unused ) {
        return EFI_UNSUPPORTED;
}

static EFI_STATUS EFIAPI
efi_null_pxe_arp ( EFI_PXE_BASE_CODE_PROTOCOL *pxe __unused,
                   EFI_IP_ADDRESS *ip __unused,
                   EFI_MAC_ADDRESS *mac __unused ) {
        return EFI_UNSUPPORTED;
}

static EFI_STATUS EFIAPI
efi_null_pxe_set_parameters ( EFI_PXE_BASE_CODE_PROTOCOL *pxe __unused,
                              BOOLEAN *autoarp __unused,
                              BOOLEAN *sendguid __unused, UINT8 *ttl __unused,
                              UINT8 *tos __unused,
                              BOOLEAN *callback __unused ) {
        return EFI_UNSUPPORTED;
}

static EFI_STATUS EFIAPI
efi_null_pxe_set_station_ip ( EFI_PXE_BASE_CODE_PROTOCOL *pxe __unused,
                              EFI_IP_ADDRESS *ip __unused,
                              EFI_IP_ADDRESS *netmask __unused ) {
        return EFI_UNSUPPORTED;
}

static EFI_STATUS EFIAPI
efi_null_pxe_set_packets ( EFI_PXE_BASE_CODE_PROTOCOL *pxe __unused,
                           BOOLEAN *dhcpdisc_ok __unused,
                           BOOLEAN *dhcpack_ok __unused,
                           BOOLEAN *proxyoffer_ok __unused,
                           BOOLEAN *pxebsdisc_ok __unused,
                           BOOLEAN *pxebsack_ok __unused,
                           BOOLEAN *pxebsbis_ok __unused,
                           EFI_PXE_BASE_CODE_PACKET *dhcpdisc __unused,
                           EFI_PXE_BASE_CODE_PACKET *dhcpack __unused,
                           EFI_PXE_BASE_CODE_PACKET *proxyoffer __unused,
                           EFI_PXE_BASE_CODE_PACKET *pxebsdisc __unused,
                           EFI_PXE_BASE_CODE_PACKET *pxebsack __unused,
                           EFI_PXE_BASE_CODE_PACKET *pxebsbis __unused ) {
        return EFI_UNSUPPORTED;
}

static EFI_PXE_BASE_CODE_PROTOCOL efi_null_pxe = {
        .Revision       = EFI_PXE_BASE_CODE_PROTOCOL_REVISION,
        .Start          = efi_null_pxe_start,
        .Stop           = efi_null_pxe_stop,
        .Dhcp           = efi_null_pxe_dhcp,
        .Discover       = efi_null_pxe_discover,
        .Mtftp          = efi_null_pxe_mtftp,
        .UdpWrite       = efi_null_pxe_udp_write,
        .UdpRead        = efi_null_pxe_udp_read,
        .SetIpFilter    = efi_null_pxe_set_ip_filter,
        .Arp            = efi_null_pxe_arp,
        .SetParameters  = efi_null_pxe_set_parameters,
        .SetStationIp   = efi_null_pxe_set_station_ip,
        .SetPackets     = efi_null_pxe_set_packets,
};

/**
 * Nullify PXE base code protocol
 *
 * @v pxe               PXE base code protocol
 */
void efi_nullify_pxe ( EFI_PXE_BASE_CODE_PROTOCOL *pxe ) {

        memcpy ( pxe, &efi_null_pxe, offsetof ( typeof ( *pxe ), Mode ) );
        pxe->Mode->Started = FALSE;
}

/******************************************************************************
 *
 * Apple Net Boot protocol
 *
 ******************************************************************************
 */

static EFI_STATUS EFIAPI
efi_null_apple_dhcp ( EFI_APPLE_NET_BOOT_PROTOCOL *apple __unused,
                      UINTN *len __unused, VOID *data __unused ) {
        return EFI_UNSUPPORTED;
}

static EFI_STATUS EFIAPI
efi_null_apple_bsdp ( EFI_APPLE_NET_BOOT_PROTOCOL *apple __unused,
                      UINTN *len __unused, VOID *data __unused ) {
        return EFI_UNSUPPORTED;
}

static EFI_APPLE_NET_BOOT_PROTOCOL efi_null_apple = {
        .GetDhcpResponse = efi_null_apple_dhcp,
        .GetBsdpResponse = efi_null_apple_bsdp,
};

/**
 * Nullify Apple Net Boot protocol
 *
 * @v apple             Apple Net Boot protocol
 */
void efi_nullify_apple ( EFI_APPLE_NET_BOOT_PROTOCOL *apple ) {

        memcpy ( apple, &efi_null_apple, sizeof ( *apple ) );
}

/******************************************************************************
 *
 * USB I/O Protocol
 *
 ******************************************************************************
 */

static EFI_STATUS EFIAPI
efi_null_usb_control_transfer ( EFI_USB_IO_PROTOCOL *usbio __unused,
                                EFI_USB_DEVICE_REQUEST *packet __unused,
                                EFI_USB_DATA_DIRECTION direction __unused,
                                UINT32 timeout __unused, VOID *data __unused,
                                UINTN len __unused, UINT32 *status __unused ) {
        return EFI_UNSUPPORTED;
}

static EFI_STATUS EFIAPI
efi_null_usb_bulk_transfer ( EFI_USB_IO_PROTOCOL *usbio __unused,
                             UINT8 endpoint __unused, VOID *data __unused,
                             UINTN *len __unused, UINTN timeout __unused,
                             UINT32 *status __unused ) {
        return EFI_UNSUPPORTED;
}

static EFI_STATUS EFIAPI
efi_null_usb_sync_interrupt_transfer ( EFI_USB_IO_PROTOCOL *usbio __unused,
                                       UINT8 endpoint __unused,
                                       VOID *data __unused,
                                       UINTN *len __unused,
                                       UINTN timeout __unused,
                                       UINT32 *status __unused ) {
        return EFI_UNSUPPORTED;
}

static EFI_STATUS EFIAPI
efi_null_usb_async_interrupt_transfer ( EFI_USB_IO_PROTOCOL *usbio __unused,
                                        UINT8 endpoint __unused,
                                        BOOLEAN start __unused,
                                        UINTN interval __unused,
                                        UINTN len __unused,
                                        EFI_ASYNC_USB_TRANSFER_CALLBACK
                                        callback __unused,
                                        VOID *context __unused ) {
        return EFI_UNSUPPORTED;
}

static EFI_STATUS EFIAPI
efi_null_usb_isochronous_transfer ( EFI_USB_IO_PROTOCOL *usbio __unused,
                                    UINT8 endpoint __unused,
                                    VOID *data __unused, UINTN len __unused,
                                    UINT32 *status __unused ) {
        return EFI_UNSUPPORTED;
}

static EFI_STATUS EFIAPI
efi_null_usb_async_isochronous_transfer ( EFI_USB_IO_PROTOCOL *usbio __unused,
                                          UINT8 endpoint __unused,
                                          VOID *data __unused,
                                          UINTN len __unused,
                                          EFI_ASYNC_USB_TRANSFER_CALLBACK
                                          callback __unused,
                                          VOID *context __unused ) {
        return EFI_UNSUPPORTED;
}

static EFI_STATUS EFIAPI
efi_null_usb_get_device_descriptor ( EFI_USB_IO_PROTOCOL *usbio __unused,
                                     EFI_USB_DEVICE_DESCRIPTOR
                                     *efidesc __unused ) {
        return EFI_UNSUPPORTED;
}

static EFI_STATUS EFIAPI
efi_null_usb_get_config_descriptor ( EFI_USB_IO_PROTOCOL *usbio __unused,
                                     EFI_USB_CONFIG_DESCRIPTOR
                                     *efidesc __unused ) {
        return EFI_UNSUPPORTED;
}

static EFI_STATUS EFIAPI
efi_null_usb_get_interface_descriptor ( EFI_USB_IO_PROTOCOL *usbio __unused,
                                        EFI_USB_INTERFACE_DESCRIPTOR
                                        *efidesc __unused ) {
        return EFI_UNSUPPORTED;
}

static EFI_STATUS EFIAPI
efi_null_usb_get_endpoint_descriptor ( EFI_USB_IO_PROTOCOL *usbio __unused,
                                       UINT8 index __unused,
                                       EFI_USB_ENDPOINT_DESCRIPTOR
                                       *efidesc __unused ) {
        return EFI_UNSUPPORTED;
}

static EFI_STATUS EFIAPI
efi_null_usb_get_string_descriptor ( EFI_USB_IO_PROTOCOL *usbio __unused,
                                     UINT16 language __unused,
                                     UINT8 index __unused,
                                     CHAR16 **string __unused ) {
        return EFI_UNSUPPORTED;
}

static EFI_STATUS EFIAPI
efi_null_usb_get_supported_languages ( EFI_USB_IO_PROTOCOL *usbio __unused,
                                       UINT16 **languages __unused,
                                       UINT16 *len __unused ) {
        return EFI_UNSUPPORTED;
}

static EFI_STATUS EFIAPI
efi_null_usb_port_reset ( EFI_USB_IO_PROTOCOL *usbio __unused ) {
        return EFI_UNSUPPORTED;
}

static EFI_USB_IO_PROTOCOL efi_null_usbio = {
        .UsbControlTransfer          = efi_null_usb_control_transfer,
        .UsbBulkTransfer             = efi_null_usb_bulk_transfer,
        .UsbAsyncInterruptTransfer   = efi_null_usb_async_interrupt_transfer,
        .UsbSyncInterruptTransfer    = efi_null_usb_sync_interrupt_transfer,
        .UsbIsochronousTransfer      = efi_null_usb_isochronous_transfer,
        .UsbAsyncIsochronousTransfer = efi_null_usb_async_isochronous_transfer,
        .UsbGetDeviceDescriptor      = efi_null_usb_get_device_descriptor,
        .UsbGetConfigDescriptor      = efi_null_usb_get_config_descriptor,
        .UsbGetInterfaceDescriptor   = efi_null_usb_get_interface_descriptor,
        .UsbGetEndpointDescriptor    = efi_null_usb_get_endpoint_descriptor,
        .UsbGetStringDescriptor      = efi_null_usb_get_string_descriptor,
        .UsbGetSupportedLanguages    = efi_null_usb_get_supported_languages,
        .UsbPortReset                = efi_null_usb_port_reset,
};

/**
 * Nullify USB I/O protocol
 *
 * @v usbio             USB I/O protocol
 */
void efi_nullify_usbio ( EFI_USB_IO_PROTOCOL *usbio ) {

        memcpy ( usbio, &efi_null_usbio, sizeof ( *usbio ) );
}