7e5f1b6738
In general, we should not present two separate (and inevitably different) hardware descriptions to the OS, in the form of ACPI tables and a device tree blob. For this reason, we recently added the logic to ArmVirtQemu to only expose the ACPI 2.0 entry point if no DT binary is being passed, and vice versa. However, this is arguably a regression for those who relied on DT descriptions being available, even if the former behavior can be restored by passing the -no-acpi switch to QEMU. So allow a secret handshake with the UEFI Shell, to set a variable that will result in ACPI to be disabled on subsequent boots even if -no-acpi was not passed on the QEMU command line. setvar -nv -bs -guid 50bea1e5-a2c5-46e9-9b3a-59596516b00a ForceNoAcpi =01 To delete the variable and revert to the old situation, simply omit the value after the = setvar -nv -bs -guid 50bea1e5-a2c5-46e9-9b3a-59596516b00a ForceNoAcpi = Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Reviewed-by: Laszlo Ersek <lersek@redhat.com> Tested-by: Marc Zyngier <marc.zyngier@arm.com> Acked-by: Marc Zyngier <marc.zyngier@arm.com>
89 lines
2.4 KiB
C
89 lines
2.4 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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This program and the accompanying materials are licensed and made available
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under the terms and conditions of the BSD License which accompanies this
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distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT
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WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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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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