9792fb0e65
https://bugzilla.tianocore.org/show_bug.cgi?id=1373 Replace BSD 2-Clause License with BSD+Patent License. This change is based on the following emails: https://lists.01.org/pipermail/edk2-devel/2019-February/036260.html https://lists.01.org/pipermail/edk2-devel/2018-October/030385.html RFCs with detailed process for the license change: V3: https://lists.01.org/pipermail/edk2-devel/2019-March/038116.html V2: https://lists.01.org/pipermail/edk2-devel/2019-March/037669.html V1: https://lists.01.org/pipermail/edk2-devel/2019-March/037500.html Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com> Reviewed-by: Laszlo Ersek <lersek@redhat.com>
83 lines
2.0 KiB
C
83 lines
2.0 KiB
C
/** @file
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Decide whether the firmware should expose an ACPI- and/or a Device Tree-based
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hardware description to the operating system.
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Copyright (c) 2017, Red Hat, Inc.
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <Guid/PlatformHasAcpi.h>
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#include <Guid/PlatformHasDeviceTree.h>
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#include <Library/BaseLib.h>
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#include <Library/DebugLib.h>
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#include <Library/PcdLib.h>
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#include <Library/QemuFwCfgLib.h>
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#include <Library/UefiBootServicesTableLib.h>
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EFI_STATUS
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EFIAPI
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PlatformHasAcpiDt (
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IN EFI_HANDLE ImageHandle,
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IN EFI_SYSTEM_TABLE *SystemTable
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)
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{
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EFI_STATUS Status;
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FIRMWARE_CONFIG_ITEM FwCfgItem;
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UINTN FwCfgSize;
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//
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// If we fail to install any of the necessary protocols below, the OS will be
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// unbootable anyway (due to lacking hardware description), so tolerate no
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// errors here.
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//
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if (MAX_UINTN == MAX_UINT64 &&
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!PcdGetBool (PcdForceNoAcpi) &&
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!EFI_ERROR (
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QemuFwCfgFindFile (
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"etc/table-loader",
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&FwCfgItem,
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&FwCfgSize
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)
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)) {
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//
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// Only make ACPI available on 64-bit systems, and only if QEMU generates
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// (a subset of) the ACPI tables.
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//
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Status = gBS->InstallProtocolInterface (
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&ImageHandle,
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&gEdkiiPlatformHasAcpiGuid,
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EFI_NATIVE_INTERFACE,
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NULL
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);
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if (EFI_ERROR (Status)) {
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goto Failed;
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}
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return Status;
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}
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//
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// Expose the Device Tree otherwise.
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//
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Status = gBS->InstallProtocolInterface (
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&ImageHandle,
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&gEdkiiPlatformHasDeviceTreeGuid,
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EFI_NATIVE_INTERFACE,
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NULL
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);
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if (EFI_ERROR (Status)) {
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goto Failed;
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}
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return Status;
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Failed:
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ASSERT_EFI_ERROR (Status);
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CpuDeadLoop ();
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//
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// Keep compilers happy.
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//
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return Status;
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}
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