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