mirror of https://github.com/ipxe/ipxe.git
609 lines
16 KiB
C
609 lines
16 KiB
C
/*
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* Copyright (C) 2011 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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FILE_LICENCE ( GPL2_OR_LATER );
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#include <stddef.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <ipxe/version.h>
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#include <ipxe/efi/efi.h>
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#include <ipxe/efi/Protocol/DriverBinding.h>
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#include <ipxe/efi/Protocol/ComponentName2.h>
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#include <ipxe/efi/Protocol/DevicePath.h>
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#include <ipxe/efi/efi_strings.h>
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#include <ipxe/efi/efi_driver.h>
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/** @file
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*
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* EFI driver interface
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*
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*/
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static EFI_DRIVER_BINDING_PROTOCOL efi_driver_binding;
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/** EFI driver binding protocol GUID */
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static EFI_GUID efi_driver_binding_protocol_guid
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= EFI_DRIVER_BINDING_PROTOCOL_GUID;
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/** EFI component name protocol GUID */
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static EFI_GUID efi_component_name2_protocol_guid
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= EFI_COMPONENT_NAME2_PROTOCOL_GUID;
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/** EFI device path protocol GUID */
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static EFI_GUID efi_device_path_protocol_guid
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= EFI_DEVICE_PATH_PROTOCOL_GUID;
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/** List of controlled EFI devices */
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static LIST_HEAD ( efi_devices );
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/**
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* Find end of device path
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*
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* @v path Path to device
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* @ret path_end End of device path
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*/
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EFI_DEVICE_PATH_PROTOCOL * efi_devpath_end ( EFI_DEVICE_PATH_PROTOCOL *path ) {
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while ( path->Type != END_DEVICE_PATH_TYPE ) {
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path = ( ( ( void * ) path ) +
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/* There's this amazing new-fangled thing known as
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* a UINT16, but who wants to use one of those? */
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( ( path->Length[1] << 8 ) | path->Length[0] ) );
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}
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return path;
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}
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/**
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* Find EFI device
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*
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* @v device EFI device handle
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* @ret efidev EFI device, or NULL if not found
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*/
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static struct efi_device * efidev_find ( EFI_HANDLE device ) {
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struct efi_device *efidev;
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/* Look for an existing EFI device */
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list_for_each_entry ( efidev, &efi_devices, dev.siblings ) {
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if ( efidev->device == device )
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return efidev;
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}
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return NULL;
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}
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/**
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* Get parent EFI device
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*
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* @v dev Generic device
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* @ret efidev Parent EFI device, or NULL
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*/
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struct efi_device * efidev_parent ( struct device *dev ) {
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struct device *parent = dev->parent;
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struct efi_device *efidev;
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/* Check that parent exists and is an EFI device */
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if ( ! parent )
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return NULL;
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if ( parent->desc.bus_type != BUS_TYPE_EFI )
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return NULL;
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/* Get containing EFI device */
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efidev = container_of ( parent, struct efi_device, dev );
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return efidev;
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}
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/**
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* Add EFI device as child of EFI device
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*
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* @v efidev EFI device
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* @v device EFI child device handle
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* @ret efirc EFI status code
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*/
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int efidev_child_add ( struct efi_device *efidev, EFI_HANDLE device ) {
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EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
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void *devpath;
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EFI_STATUS efirc;
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int rc;
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/* Re-open the device path protocol */
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if ( ( efirc = bs->OpenProtocol ( efidev->device,
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&efi_device_path_protocol_guid,
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&devpath,
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efi_image_handle, device,
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EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER
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) ) != 0 ) {
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rc = -EEFI ( efirc );
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DBGC ( efidev->device, "EFIDRV %p %s could not add child",
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efidev->device, efi_devpath_text ( efidev->path ) );
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DBGC ( efidev->device, " %p %s: %s\n", device,
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efi_handle_devpath_text ( device ), strerror ( rc ) );
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return rc;
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}
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DBGC2 ( efidev->device, "EFIDRV %p %s added child",
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efidev->device, efi_devpath_text ( efidev->path ) );
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DBGC2 ( efidev->device, " %p %s\n",
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device, efi_handle_devpath_text ( device ) );
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return 0;
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}
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/**
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* Remove EFI device as child of EFI device
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*
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* @v efidev EFI device
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* @v device EFI child device handle
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* @ret efirc EFI status code
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*/
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void efidev_child_del ( struct efi_device *efidev, EFI_HANDLE device ) {
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EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
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bs->CloseProtocol ( efidev->device,
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&efi_device_path_protocol_guid,
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efi_image_handle, device );
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DBGC2 ( efidev->device, "EFIDRV %p %s removed child",
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efidev->device, efi_devpath_text ( efidev->path ) );
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DBGC2 ( efidev->device, " %p %s\n",
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device, efi_handle_devpath_text ( device ) );
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}
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/**
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* Check to see if driver supports a device
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*
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* @v driver EFI driver
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* @v device EFI device
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* @v child Path to child device, if any
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* @ret efirc EFI status code
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*/
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static EFI_STATUS EFIAPI
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efi_driver_supported ( EFI_DRIVER_BINDING_PROTOCOL *driver __unused,
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EFI_HANDLE device, EFI_DEVICE_PATH_PROTOCOL *child ) {
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struct efi_driver *efidrv;
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int rc;
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DBGCP ( device, "EFIDRV %p %s DRIVER_SUPPORTED",
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device, efi_handle_devpath_text ( device ) );
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if ( child )
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DBGCP ( device, " (child %s)", efi_devpath_text ( child ) );
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DBGCP ( device, "\n" );
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/* Do nothing if we are already driving this device */
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if ( efidev_find ( device ) != NULL ) {
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DBGCP ( device, "EFIDRV %p %s is already started\n",
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device, efi_handle_devpath_text ( device ) );
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return EFI_ALREADY_STARTED;
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}
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/* Look for a driver claiming to support this device */
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for_each_table_entry ( efidrv, EFI_DRIVERS ) {
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if ( ( rc = efidrv->supported ( device ) ) == 0 ) {
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DBGC ( device, "EFIDRV %p %s has driver \"%s\"\n",
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device, efi_handle_devpath_text ( device ),
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efidrv->name );
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return 0;
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}
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}
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DBGCP ( device, "EFIDRV %p %s has no driver\n",
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device, efi_handle_devpath_text ( device ) );
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return EFI_UNSUPPORTED;
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}
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/**
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* Attach driver to device
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*
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* @v driver EFI driver
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* @v device EFI device
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* @v child Path to child device, if any
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* @ret efirc EFI status code
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*/
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static EFI_STATUS EFIAPI
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efi_driver_start ( EFI_DRIVER_BINDING_PROTOCOL *driver __unused,
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EFI_HANDLE device, EFI_DEVICE_PATH_PROTOCOL *child ) {
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EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
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struct efi_driver *efidrv;
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struct efi_device *efidev;
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union {
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EFI_DEVICE_PATH_PROTOCOL *devpath;
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void *interface;
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} devpath;
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EFI_STATUS efirc;
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int rc;
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DBGC ( device, "EFIDRV %p %s DRIVER_START",
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device, efi_handle_devpath_text ( device ) );
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if ( child )
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DBGC ( device, " (child %s)", efi_devpath_text ( child ) );
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DBGC ( device, "\n" );
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/* Do nothing if we are already driving this device */
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efidev = efidev_find ( device );
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if ( efidev ) {
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DBGCP ( device, "EFIDRV %p %s is already started\n",
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device, efi_devpath_text ( efidev->path ) );
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efirc = EFI_ALREADY_STARTED;
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goto err_already_started;
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}
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/* Allocate and initialise structure */
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efidev = zalloc ( sizeof ( *efidev ) );
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if ( ! efidev ) {
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efirc = EFI_OUT_OF_RESOURCES;
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goto err_alloc;
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}
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efidev->device = device;
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efidev->dev.desc.bus_type = BUS_TYPE_EFI;
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INIT_LIST_HEAD ( &efidev->dev.children );
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list_add ( &efidev->dev.siblings, &efi_devices );
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/* Open device path protocol */
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if ( ( efirc = bs->OpenProtocol ( device,
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&efi_device_path_protocol_guid,
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&devpath.interface,
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efi_image_handle, device,
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EFI_OPEN_PROTOCOL_BY_DRIVER ) ) != 0){
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DBGCP ( device, "EFIDRV %p %s has no device path\n",
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device, efi_handle_devpath_text ( device ) );
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goto err_no_device_path;
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}
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efidev->path = devpath.devpath;
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/* Try to start this device */
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for_each_table_entry ( efidrv, EFI_DRIVERS ) {
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if ( ( rc = efidrv->supported ( device ) ) != 0 ) {
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DBGC ( device, "EFIDEV %p %s is not supported by "
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"driver \"%s\": %s\n",
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device, efi_devpath_text ( efidev->path ),
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efidrv->name, strerror ( rc ) );
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continue;
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}
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if ( ( rc = efidrv->start ( efidev ) ) == 0 ) {
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efidev->driver = efidrv;
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DBGC ( device, "EFIDRV %p %s using driver \"%s\"\n",
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device, efi_devpath_text ( efidev->path ),
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efidev->driver->name );
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return 0;
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}
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DBGC ( device, "EFIDRV %p %s could not start driver \"%s\": "
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"%s\n", device, efi_devpath_text ( efidev->path ),
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efidrv->name, strerror ( rc ) );
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}
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efirc = EFI_UNSUPPORTED;
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bs->CloseProtocol ( device, &efi_device_path_protocol_guid,
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efi_image_handle, device );
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err_no_device_path:
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list_del ( &efidev->dev.siblings );
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free ( efidev );
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err_alloc:
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err_already_started:
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return efirc;
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}
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/**
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* Detach driver from device
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*
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* @v driver EFI driver
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* @v device EFI device
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* @v pci PCI device
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* @v num_children Number of child devices
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* @v children List of child devices
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* @ret efirc EFI status code
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*/
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static EFI_STATUS EFIAPI
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efi_driver_stop ( EFI_DRIVER_BINDING_PROTOCOL *driver __unused,
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EFI_HANDLE device, UINTN num_children,
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EFI_HANDLE *children ) {
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EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
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struct efi_driver *efidrv;
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struct efi_device *efidev;
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UINTN i;
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DBGC ( device, "EFIDRV %p %s DRIVER_STOP",
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device, efi_handle_devpath_text ( device ) );
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for ( i = 0 ; i < num_children ; i++ ) {
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DBGC ( device, "%s%p %s", ( i ? ", " : " child " ),
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children[i], efi_handle_devpath_text ( children[i] ) );
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}
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DBGC ( device, "\n" );
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/* Do nothing unless we are driving this device */
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efidev = efidev_find ( device );
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if ( ! efidev ) {
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DBGCP ( device, "EFIDRV %p %s is not started\n",
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device, efi_devpath_text ( efidev->path ) );
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return 0;
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}
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/* Stop this device */
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efidrv = efidev->driver;
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assert ( efidrv != NULL );
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efidrv->stop ( efidev );
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bs->CloseProtocol ( efidev->device, &efi_device_path_protocol_guid,
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efi_image_handle, efidev->device );
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list_del ( &efidev->dev.siblings );
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free ( efidev );
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return 0;
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}
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/** EFI driver binding protocol */
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static EFI_DRIVER_BINDING_PROTOCOL efi_driver_binding = {
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.Supported = efi_driver_supported,
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.Start = efi_driver_start,
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.Stop = efi_driver_stop,
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};
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/**
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* Look up driver name
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*
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* @v wtf Component name protocol
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* @v language Language to use
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* @v driver_name Driver name to fill in
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* @ret efirc EFI status code
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*/
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static EFI_STATUS EFIAPI
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efi_driver_name ( EFI_COMPONENT_NAME2_PROTOCOL *wtf __unused,
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CHAR8 *language __unused, CHAR16 **driver_name ) {
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const wchar_t *name;
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name = ( product_wname[0] ? product_wname : build_wname );
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*driver_name = ( ( wchar_t * ) name );
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return 0;
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}
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/**
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* Look up controller name
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*
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* @v wtf Component name protocol
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* @v device Device
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* @v child Child device, or NULL
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* @v language Language to use
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* @v driver_name Device name to fill in
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* @ret efirc EFI status code
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*/
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static EFI_STATUS EFIAPI
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efi_driver_controller_name ( EFI_COMPONENT_NAME2_PROTOCOL *wtf __unused,
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EFI_HANDLE device, EFI_HANDLE child,
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CHAR8 *language, CHAR16 **controller_name ) {
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EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
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union {
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EFI_COMPONENT_NAME2_PROTOCOL *name2;
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void *interface;
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} name2;
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EFI_STATUS efirc;
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/* Delegate to the EFI_COMPONENT_NAME2_PROTOCOL instance
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* installed on child handle, if present.
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*/
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if ( ( child != NULL ) &&
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( ( efirc = bs->OpenProtocol (
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child, &efi_component_name2_protocol_guid,
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&name2.interface, NULL, NULL,
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EFI_OPEN_PROTOCOL_GET_PROTOCOL ) ) == 0 ) ) {
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return name2.name2->GetControllerName ( name2.name2, device,
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child, language,
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controller_name );
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}
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/* Otherwise, let EFI use the default Device Path Name */
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return EFI_UNSUPPORTED;
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}
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/** EFI component name protocol */
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static EFI_COMPONENT_NAME2_PROTOCOL efi_wtf = {
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.GetDriverName = efi_driver_name,
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.GetControllerName = efi_driver_controller_name,
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.SupportedLanguages = "en",
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};
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/**
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* Install EFI driver
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*
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* @ret rc Return status code
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*/
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int efi_driver_install ( void ) {
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EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
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EFI_STATUS efirc;
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int rc;
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/* Calculate driver version number. We use the build
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* timestamp (in seconds since the Epoch) shifted right by six
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* bits: this gives us an approximately one-minute resolution
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* and a scheme which will last until the year 10680.
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*/
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efi_driver_binding.Version = ( build_timestamp >> 6 );
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/* Install protocols on image handle */
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efi_driver_binding.ImageHandle = efi_image_handle;
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efi_driver_binding.DriverBindingHandle = efi_image_handle;
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if ( ( efirc = bs->InstallMultipleProtocolInterfaces (
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&efi_image_handle,
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&efi_driver_binding_protocol_guid, &efi_driver_binding,
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&efi_component_name2_protocol_guid, &efi_wtf,
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NULL ) ) != 0 ) {
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rc = -EEFI ( efirc );
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DBGC ( &efi_driver_binding, "EFIDRV could not install "
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"protocols: %s\n", strerror ( rc ) );
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return rc;
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}
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return 0;
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}
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/**
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* Uninstall EFI driver
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*
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*/
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void efi_driver_uninstall ( void ) {
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EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
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/* Uninstall protocols */
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bs->UninstallMultipleProtocolInterfaces (
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efi_image_handle,
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&efi_driver_binding_protocol_guid, &efi_driver_binding,
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&efi_component_name2_protocol_guid, &efi_wtf, NULL );
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}
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/**
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* Try to connect EFI driver
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*
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* @v device EFI device
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* @ret rc Return status code
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*/
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static int efi_driver_connect ( EFI_HANDLE device ) {
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EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
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EFI_HANDLE drivers[2] =
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{ efi_driver_binding.DriverBindingHandle, NULL };
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EFI_STATUS efirc;
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int rc;
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/* Check if we want to drive this device */
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if ( ( efirc = efi_driver_supported ( &efi_driver_binding, device,
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NULL ) ) != 0 ) {
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/* Not supported; not an error */
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return 0;
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}
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/* Disconnect any existing drivers */
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DBGC ( device, "EFIDRV %p %s disconnecting existing drivers\n",
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device, efi_handle_devpath_text ( device ) );
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bs->DisconnectController ( device, NULL, NULL );
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/* Connect our driver */
|
|
DBGC ( device, "EFIDRV %p %s connecting new drivers\n",
|
|
device, efi_handle_devpath_text ( device ) );
|
|
if ( ( efirc = bs->ConnectController ( device, drivers, NULL,
|
|
FALSE ) ) != 0 ) {
|
|
rc = -EEFI ( efirc );
|
|
DBGC ( device, "EFIDRV %p %s could not connect new drivers: "
|
|
"%s\n", device, efi_handle_devpath_text ( device ),
|
|
strerror ( rc ) );
|
|
return rc;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Try to disconnect EFI driver
|
|
*
|
|
* @v device EFI device
|
|
* @ret rc Return status code
|
|
*/
|
|
static int efi_driver_disconnect ( EFI_HANDLE device ) {
|
|
EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
|
|
|
|
/* Disconnect our driver */
|
|
bs->DisconnectController ( device,
|
|
efi_driver_binding.DriverBindingHandle,
|
|
NULL );
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Reconnect original EFI driver
|
|
*
|
|
* @v device EFI device
|
|
* @ret rc Return status code
|
|
*/
|
|
static int efi_driver_reconnect ( EFI_HANDLE device ) {
|
|
EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
|
|
|
|
/* Reconnect any available driver */
|
|
bs->ConnectController ( device, NULL, NULL, FALSE );
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Connect/disconnect EFI driver from all handles
|
|
*
|
|
* @v method Connect/disconnect method
|
|
* @ret rc Return status code
|
|
*/
|
|
static int efi_driver_handles ( int ( * method ) ( EFI_HANDLE handle ) ) {
|
|
EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
|
|
EFI_HANDLE *handles;
|
|
UINTN num_handles;
|
|
EFI_STATUS efirc;
|
|
UINTN i;
|
|
int rc;
|
|
|
|
/* Enumerate all handles */
|
|
if ( ( efirc = bs->LocateHandleBuffer ( AllHandles, NULL, NULL,
|
|
&num_handles,
|
|
&handles ) ) != 0 ) {
|
|
rc = -EEFI ( efirc );
|
|
DBGC ( &efi_driver_binding, "EFIDRV could not list handles: "
|
|
"%s\n", strerror ( rc ) );
|
|
goto err_locate;
|
|
}
|
|
|
|
/* Connect/disconnect driver from all handles */
|
|
for ( i = 0 ; i < num_handles ; i++ ) {
|
|
if ( ( rc = method ( handles[i] ) ) != 0 )
|
|
goto err_method;
|
|
}
|
|
|
|
/* Success */
|
|
rc = 0;
|
|
|
|
err_method:
|
|
bs->FreePool ( handles );
|
|
err_locate:
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* Connect EFI driver to all possible devices
|
|
*
|
|
* @ret rc Return status code
|
|
*/
|
|
int efi_driver_connect_all ( void ) {
|
|
|
|
DBGC ( &efi_driver_binding, "EFIDRV connecting our drivers\n" );
|
|
return efi_driver_handles ( efi_driver_connect );
|
|
}
|
|
|
|
/**
|
|
* Disconnect EFI driver from all possible devices
|
|
*
|
|
* @ret rc Return status code
|
|
*/
|
|
void efi_driver_disconnect_all ( void ) {
|
|
|
|
DBGC ( &efi_driver_binding, "EFIDRV disconnecting our drivers\n" );
|
|
efi_driver_handles ( efi_driver_disconnect );
|
|
}
|
|
|
|
/**
|
|
* Reconnect original EFI drivers to all possible devices
|
|
*
|
|
* @ret rc Return status code
|
|
*/
|
|
void efi_driver_reconnect_all ( void ) {
|
|
|
|
DBGC ( &efi_driver_binding, "EFIDRV reconnecting old drivers\n" );
|
|
efi_driver_handles ( efi_driver_reconnect );
|
|
}
|