045a22764a
EFI passes in copies of SMBIOS and other system configuration tables via the EFI system table. Allow configuration tables to be requested using a mechanism similar to the current method for requesting EFI protocols.
125 lines
3.8 KiB
C
125 lines
3.8 KiB
C
/*
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* Copyright (C) 2008 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., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <gpxe/efi/efi.h>
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#include <gpxe/uuid.h>
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/** Image handle passed to entry point */
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EFI_HANDLE efi_image_handle;
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/** System table passed to entry point */
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EFI_SYSTEM_TABLE *efi_systab;
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/** Declared used EFI protocols */
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static struct efi_protocol efi_protocols[0] \
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__table_start ( struct efi_protocol, efi_protocols );
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static struct efi_protocol efi_protocols_end[0] \
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__table_end ( struct efi_protocol, efi_protocols );
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/** Declared used EFI configuration tables */
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static struct efi_config_table efi_config_tables[0] \
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__table_start ( struct efi_config_table, efi_config_tables );
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static struct efi_config_table efi_config_tables_end[0] \
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__table_end ( struct efi_config_table, efi_config_tables );
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/**
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* Look up EFI configuration table
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*
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* @v guid Configuration table GUID
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* @ret table Configuration table, or NULL
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*/
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static void * efi_find_table ( EFI_GUID *guid ) {
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unsigned int i;
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for ( i = 0 ; i < efi_systab->NumberOfTableEntries ; i++ ) {
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if ( memcmp ( &efi_systab->ConfigurationTable[i].VendorGuid,
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guid, sizeof ( *guid ) ) == 0 )
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return efi_systab->ConfigurationTable[i].VendorTable;
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}
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return NULL;
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}
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/**
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* EFI entry point
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*
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* @v image_handle Image handle
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* @v systab System table
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* @ret efirc EFI return status code
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*/
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EFI_STATUS EFIAPI efi_entry ( EFI_HANDLE image_handle,
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EFI_SYSTEM_TABLE *systab ) {
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EFI_BOOT_SERVICES *bs;
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struct efi_protocol *prot;
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struct efi_config_table *tab;
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EFI_STATUS efirc;
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/* Store image handle and system table pointer for future use */
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efi_image_handle = image_handle;
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efi_systab = systab;
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/* Sanity checks */
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if ( ! systab )
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return EFI_NOT_AVAILABLE_YET;
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if ( ! systab->ConOut )
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return EFI_NOT_AVAILABLE_YET;
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if ( ! systab->BootServices ) {
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DBGC ( systab, "EFI provided no BootServices entry point\n" );
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return EFI_NOT_AVAILABLE_YET;
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}
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if ( ! systab->RuntimeServices ) {
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DBGC ( systab, "EFI provided no RuntimeServices entry "
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"point\n" );
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return EFI_NOT_AVAILABLE_YET;
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}
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DBGC ( systab, "EFI handle %p systab %p\n", image_handle, systab );
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/* Look up used protocols */
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bs = systab->BootServices;
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for ( prot = efi_protocols ; prot < efi_protocols_end ; prot++ ) {
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if ( ( efirc = bs->LocateProtocol ( &prot->u.guid, NULL,
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prot->protocol ) ) == 0 ) {
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DBGC ( systab, "EFI protocol %s is at %p\n",
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uuid_ntoa ( &prot->u.uuid ), *(prot->protocol));
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} else {
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DBGC ( systab, "EFI does not provide protocol %s\n",
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uuid_ntoa ( &prot->u.uuid ) );
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/* All protocols are required */
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return efirc;
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}
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}
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/* Look up used configuration tables */
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for ( tab = efi_config_tables ; tab < efi_config_tables_end ; tab++ ) {
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if ( ( *(tab->table) = efi_find_table ( &tab->u.guid ) ) ) {
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DBGC ( systab, "EFI configuration table %s is at %p\n",
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uuid_ntoa ( &tab->u.uuid ), *(tab->table) );
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} else {
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DBGC ( systab, "EFI does not provide configuration "
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"table %s\n", uuid_ntoa ( &tab->u.uuid ) );
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if ( tab->required )
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return EFI_NOT_AVAILABLE_YET;
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}
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}
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/* Call to main() */
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return RC_TO_EFIRC ( main () );
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}
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