mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
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84 lines
2.0 KiB
C
84 lines
2.0 KiB
C
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/** @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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//
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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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