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- /*
- * Copyright (C) 2008 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., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
- FILE_LICENCE ( GPL2_OR_LATER );
-
- #include <string.h>
- #include <ipxe/efi/efi.h>
- #include <ipxe/efi/Protocol/LoadedImage.h>
- #include <ipxe/uuid.h>
- #include <ipxe/init.h>
-
- /** Image handle passed to entry point */
- EFI_HANDLE efi_image_handle;
-
- /** Loaded image protocol for this image */
- EFI_LOADED_IMAGE_PROTOCOL *efi_loaded_image;
-
- /** System table passed to entry point */
- EFI_SYSTEM_TABLE *efi_systab;
-
- /** EFI loaded image protocol GUID */
- static EFI_GUID efi_loaded_image_protocol_guid
- = EFI_LOADED_IMAGE_PROTOCOL_GUID;
-
- /** Event used to signal shutdown */
- static EFI_EVENT efi_shutdown_event;
-
- /**
- * Shut down in preparation for booting an OS.
- *
- * This hook gets called at ExitBootServices time in order to make
- * sure that everything is properly shut down before the OS takes
- * over.
- */
- static EFIAPI void efi_shutdown_hook ( EFI_EVENT event __unused,
- void *context __unused ) {
- shutdown_boot();
- }
-
- /**
- * Look up EFI configuration table
- *
- * @v guid Configuration table GUID
- * @ret table Configuration table, or NULL
- */
- static void * efi_find_table ( EFI_GUID *guid ) {
- unsigned int i;
-
- for ( i = 0 ; i < efi_systab->NumberOfTableEntries ; i++ ) {
- if ( memcmp ( &efi_systab->ConfigurationTable[i].VendorGuid,
- guid, sizeof ( *guid ) ) == 0 )
- return efi_systab->ConfigurationTable[i].VendorTable;
- }
-
- return NULL;
- }
-
- /**
- * Initialise EFI environment
- *
- * @v image_handle Image handle
- * @v systab System table
- * @ret efirc EFI return status code
- */
- EFI_STATUS efi_init ( EFI_HANDLE image_handle,
- EFI_SYSTEM_TABLE *systab ) {
- EFI_BOOT_SERVICES *bs;
- struct efi_protocol *prot;
- struct efi_config_table *tab;
- EFI_STATUS efirc;
- void *loaded_image;
-
- /* Store image handle and system table pointer for future use */
- efi_image_handle = image_handle;
- efi_systab = systab;
-
- /* Sanity checks */
- if ( ! systab )
- return EFI_NOT_AVAILABLE_YET;
- if ( ! systab->ConOut )
- return EFI_NOT_AVAILABLE_YET;
- if ( ! systab->BootServices ) {
- DBGC ( systab, "EFI provided no BootServices entry point\n" );
- return EFI_NOT_AVAILABLE_YET;
- }
- if ( ! systab->RuntimeServices ) {
- DBGC ( systab, "EFI provided no RuntimeServices entry "
- "point\n" );
- return EFI_NOT_AVAILABLE_YET;
- }
- DBGC ( systab, "EFI handle %p systab %p\n", image_handle, systab );
-
- bs = systab->BootServices;
- efirc = bs->OpenProtocol ( image_handle,
- &efi_loaded_image_protocol_guid,
- &loaded_image, image_handle, NULL,
- EFI_OPEN_PROTOCOL_GET_PROTOCOL );
- if ( efirc ) {
- DBGC ( systab, "Could not get loaded image protocol" );
- return efirc;
- }
-
- efi_loaded_image = loaded_image;
- DBG ( "Image base address = %p\n", efi_loaded_image->ImageBase );
-
- /* Look up used protocols */
- for_each_table_entry ( prot, EFI_PROTOCOLS ) {
- if ( ( efirc = bs->LocateProtocol ( &prot->u.guid, NULL,
- prot->protocol ) ) == 0 ) {
- DBGC ( systab, "EFI protocol %s is at %p\n",
- uuid_ntoa ( &prot->u.uuid ), *(prot->protocol));
- } else {
- DBGC ( systab, "EFI does not provide protocol %s\n",
- uuid_ntoa ( &prot->u.uuid ) );
- /* All protocols are required */
- return efirc;
- }
- }
-
- /* Look up used configuration tables */
- for_each_table_entry ( tab, EFI_CONFIG_TABLES ) {
- if ( ( *(tab->table) = efi_find_table ( &tab->u.guid ) ) ) {
- DBGC ( systab, "EFI configuration table %s is at %p\n",
- uuid_ntoa ( &tab->u.uuid ), *(tab->table) );
- } else {
- DBGC ( systab, "EFI does not provide configuration "
- "table %s\n", uuid_ntoa ( &tab->u.uuid ) );
- if ( tab->required )
- return EFI_NOT_AVAILABLE_YET;
- }
- }
-
- /* EFI is perfectly capable of gracefully shutting down any
- * loaded devices if it decides to fall back to a legacy boot.
- * For no particularly comprehensible reason, it doesn't
- * bother doing so when ExitBootServices() is called.
- */
- if ( ( efirc = bs->CreateEvent ( EVT_SIGNAL_EXIT_BOOT_SERVICES,
- TPL_CALLBACK, efi_shutdown_hook,
- NULL, &efi_shutdown_event ) ) != 0 ) {
- DBGC ( systab, "EFI could not create ExitBootServices event: "
- "%s\n", efi_strerror ( efirc ) );
- return efirc;
- }
-
- return 0;
- }
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