/** @file
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DXE Reset System Library Shutdown API implementation for OVMF.
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Copyright (C) 2020, Red Hat, Inc.
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Copyright (c) 2006 - 2019, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <Base.h> // BIT13
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#include <Library/BaseLib.h> // CpuDeadLoop()
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#include <Library/DebugLib.h> // ASSERT()
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#include <Library/IoLib.h> // IoOr16()
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#include <Library/PcdLib.h> // PcdGet16()
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#include <Library/ResetSystemLib.h> // ResetShutdown()
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#include <OvmfPlatforms.h> // PIIX4_PMBA_VALUE
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STATIC UINT16 mAcpiPmBaseAddress;
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EFI_STATUS
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EFIAPI
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DxeResetInit (
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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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UINT16 HostBridgeDevId;
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HostBridgeDevId = PcdGet16 (PcdOvmfHostBridgePciDevId);
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switch (HostBridgeDevId) {
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case INTEL_82441_DEVICE_ID:
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mAcpiPmBaseAddress = PIIX4_PMBA_VALUE;
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break;
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case INTEL_Q35_MCH_DEVICE_ID:
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mAcpiPmBaseAddress = ICH9_PMBASE_VALUE;
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break;
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default:
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ASSERT (FALSE);
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CpuDeadLoop ();
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return EFI_UNSUPPORTED;
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}
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return EFI_SUCCESS;
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}
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/**
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Calling this function causes the system to enter a power state equivalent
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to the ACPI G2/S5 or G3 states.
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System shutdown should not return, if it returns, it means the system does
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not support shut down reset.
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**/
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VOID
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EFIAPI
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ResetShutdown (
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VOID
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)
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{
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IoBitFieldWrite16 (mAcpiPmBaseAddress + 4, 10, 13, 0);
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IoOr16 (mAcpiPmBaseAddress + 4, BIT13);
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CpuDeadLoop ();
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}
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