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+/** @file
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+ VMGEXIT Base Support Library.
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+
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+ Copyright (C) 2020, Advanced Micro Devices, Inc. All rights reserved.<BR>
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+ SPDX-License-Identifier: BSD-2-Clause-Patent
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+
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+**/
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+
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+#include <Base.h>
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+#include <Uefi.h>
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+#include <Library/VmgExitLib.h>
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+
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+/**
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+ Perform VMGEXIT.
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+
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+ Sets the necessary fields of the GHCB, invokes the VMGEXIT instruction and
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+ then handles the return actions.
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+
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+ The base library function returns an error in the form of a
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+ GHCB_EVENT_INJECTION representing a GP_EXCEPTION.
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+
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+ @param[in, out] Ghcb A pointer to the GHCB
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+ @param[in] ExitCode VMGEXIT code to be assigned to the SwExitCode
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+ field of the GHCB.
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+ @param[in] ExitInfo1 VMGEXIT information to be assigned to the
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+ SwExitInfo1 field of the GHCB.
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+ @param[in] ExitInfo2 VMGEXIT information to be assigned to the
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+ SwExitInfo2 field of the GHCB.
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+
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+ @retval 0 VMGEXIT succeeded.
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+ @return Exception number to be propagated, VMGEXIT
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+ processing did not succeed.
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+
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+**/
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+UINT64
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+EFIAPI
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+VmgExit (
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+ IN OUT GHCB *Ghcb,
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+ IN UINT64 ExitCode,
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+ IN UINT64 ExitInfo1,
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+ IN UINT64 ExitInfo2
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+ )
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+{
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+ GHCB_EVENT_INJECTION Event;
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+
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+ Event.Uint64 = 0;
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+ Event.Elements.Vector = GP_EXCEPTION;
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+ Event.Elements.Type = GHCB_EVENT_INJECTION_TYPE_EXCEPTION;
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+ Event.Elements.Valid = 1;
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+
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+ return Event.Uint64;
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+}
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+
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+/**
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+ Perform pre-VMGEXIT initialization/preparation.
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+
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+ Performs the necessary steps in preparation for invoking VMGEXIT. Must be
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+ called before setting any fields within the GHCB.
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+
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+ The base library function does nothing.
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+
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+ @param[in, out] Ghcb A pointer to the GHCB
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+
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+**/
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+VOID
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+EFIAPI
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+VmgInit (
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+ IN OUT GHCB *Ghcb
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+ )
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+{
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+}
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+
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+/**
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+ Perform post-VMGEXIT cleanup.
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+
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+ Performs the necessary steps to cleanup after invoking VMGEXIT. Must be
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+ called after obtaining needed fields within the GHCB.
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+
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+ The base library function does nothing.
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+
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+ @param[in, out] Ghcb A pointer to the GHCB
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+
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+**/
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+VOID
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+EFIAPI
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+VmgDone (
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+ IN OUT GHCB *Ghcb
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+ )
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+{
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+}
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+
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+/**
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+ Handle a #VC exception.
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+
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+ Performs the necessary processing to handle a #VC exception.
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+
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+ The base library function returns an error equal to VC_EXCEPTION,
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+ to be propagated to the standard exception handling stack.
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+
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+ @param[in, out] ExceptionType Pointer to an EFI_EXCEPTION_TYPE to be set
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+ as value to use on error.
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+ @param[in, out] SystemContext Pointer to EFI_SYSTEM_CONTEXT
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+
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+ @retval EFI_SUCCESS Exception handled
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+ @retval EFI_UNSUPPORTED #VC not supported, (new) exception value to
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+ propagate provided
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+ @retval EFI_PROTOCOL_ERROR #VC handling failed, (new) exception value to
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+ propagate provided
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+
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+**/
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+EFI_STATUS
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+EFIAPI
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+VmgExitHandleVc (
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+ IN OUT EFI_EXCEPTION_TYPE *ExceptionType,
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+ IN OUT EFI_SYSTEM_CONTEXT SystemContext
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+ )
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+{
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+ *ExceptionType = VC_EXCEPTION;
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+
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+ return EFI_UNSUPPORTED;
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+}
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