iPXE
efi_acpi.c
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00001 /*
00002  * Copyright (C) 2017 Michael Brown <mbrown@fensystems.co.uk>.
00003  *
00004  * This program is free software; you can redistribute it and/or
00005  * modify it under the terms of the GNU General Public License as
00006  * published by the Free Software Foundation; either version 2 of the
00007  * License, or any later version.
00008  *
00009  * This program is distributed in the hope that it will be useful, but
00010  * WITHOUT ANY WARRANTY; without even the implied warranty of
00011  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012  * General Public License for more details.
00013  *
00014  * You should have received a copy of the GNU General Public License
00015  * along with this program; if not, write to the Free Software
00016  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
00017  * 02110-1301, USA.
00018  *
00019  * You can also choose to distribute this program under the terms of
00020  * the Unmodified Binary Distribution Licence (as given in the file
00021  * COPYING.UBDL), provided that you have satisfied its requirements.
00022  */
00023 
00024 FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
00025 
00026 /**
00027  * @file
00028  *
00029  * iPXE ACPI API for EFI
00030  *
00031  */
00032 
00033 #include <ipxe/acpi.h>
00034 #include <ipxe/efi/efi.h>
00035 #include <ipxe/efi/Guid/Acpi.h>
00036 #include <ipxe/efi/efi_acpi.h>
00037 
00038 /** ACPI configuration table */
00039 static EFI_ACPI_1_0_ROOT_SYSTEM_DESCRIPTION_POINTER *rsdp;
00040 EFI_USE_TABLE ( ACPI_10_TABLE, &rsdp, 0 );
00041 
00042 /**
00043  * Locate ACPI root system description table
00044  *
00045  * @ret rsdt            ACPI root system description table, or UNULL
00046  */
00047 static userptr_t efi_find_rsdt ( void ) {
00048 
00049         /* Locate RSDT via ACPI configuration table, if available */
00050         if ( rsdp )
00051                 return phys_to_user ( rsdp->RsdtAddress );
00052 
00053         return UNULL;
00054 }
00055 
00056 PROVIDE_ACPI ( efi, acpi_find_rsdt, efi_find_rsdt );