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+/*
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+ * Copyright (C) 2017 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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+ * You can also choose to distribute this program under the terms of
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+ * the Unmodified Binary Distribution Licence (as given in the file
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+ * COPYING.UBDL), provided that you have satisfied its requirements.
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+ */
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+
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+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
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+
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+/**
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+ * @file
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+ *
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+ * iPXE ACPI API for EFI
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+ *
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+ */
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+
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+#include <ipxe/acpi.h>
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+#include <ipxe/efi/efi.h>
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+#include <ipxe/efi/Guid/Acpi.h>
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+#include <ipxe/efi/efi_acpi.h>
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+
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+/** ACPI configuration table */
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+static EFI_ACPI_1_0_ROOT_SYSTEM_DESCRIPTION_POINTER *rsdp;
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+EFI_USE_TABLE ( ACPI_10_TABLE, &rsdp, 0 );
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+
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+/**
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+ * Locate ACPI root system description table
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+ *
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+ * @ret rsdt ACPI root system description table, or UNULL
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+ */
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+static userptr_t efi_find_rsdt ( void ) {
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+
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+ /* Locate RSDT via ACPI configuration table, if available */
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+ if ( rsdp )
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+ return phys_to_user ( rsdp->RsdtAddress );
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+
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+ return UNULL;
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+}
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+
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+PROVIDE_ACPI ( efi, acpi_find_rsdt, efi_find_rsdt );
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