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9776f6ece1
The ACPI API currently expects platforms to provide access to a single contiguous ACPI table. Some platforms (e.g. Linux userspace) do not provide a convenient way to obtain the entire ACPI table, but do provide access to individual tables. All iPXE consumers of the ACPI API require access only to individual tables. Redefine the internal API to make acpi_find() an API method, with all existing implementations delegating to the current RSDT-based implementation. Signed-off-by: Michael Brown <mcb30@ipxe.org>
58 lines
1.7 KiB
C
58 lines
1.7 KiB
C
/*
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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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FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
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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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#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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/** 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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* 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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/* 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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return UNULL;
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}
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PROVIDE_ACPI ( efi, acpi_find_rsdt, efi_find_rsdt );
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PROVIDE_ACPI_INLINE ( efi, acpi_find );
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