OvmfPkg/SecMain: move SEV specific routines in AmdSev.c

BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3275

Move all the SEV specific function in AmdSev.c.

No functional change intended.

Cc: Michael Roth <michael.roth@amd.com>
Cc: James Bottomley <jejb@linux.ibm.com>
Cc: Min Xu <min.m.xu@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Erdem Aktas <erdemaktas@google.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Acked-by: Jiewen Yao <Jiewen.yao@intel.com>
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>

OvmfPkg/Sec/AmdSev.h

@@ -0,0 +1,71 @@
+/** @file
+  File defines the Sec routines for the AMD SEV
+
+  Copyright (c) 2021, Advanced Micro Devices, Inc. All rights reserved.<BR>
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef _AMD_SEV_SEC_INTERNAL_H__
+#define _AMD_SEV_SEC_INTERNAL_H__
+
+/**
+  Handle an SEV-ES/GHCB protocol check failure.
+
+  Notify the hypervisor using the VMGEXIT instruction that the SEV-ES guest
+  wishes to be terminated.
+
+  @param[in] ReasonCode  Reason code to provide to the hypervisor for the
+                         termination request.
+
+**/
+VOID
+SevEsProtocolFailure (
+  IN UINT8  ReasonCode
+  );
+
+/**
+  Validate the SEV-ES/GHCB protocol level.
+
+  Verify that the level of SEV-ES/GHCB protocol supported by the hypervisor
+  and the guest intersect. If they don't intersect, request termination.
+
+**/
+VOID
+SevEsProtocolCheck (
+  VOID
+  );
+
+/**
+ Determine if the SEV is active.
+
+ During the early booting, GuestType is set in the work area. Verify that it
+ is an SEV guest.
+
+ @retval TRUE   SEV is enabled
+ @retval FALSE  SEV is not enabled
+
+**/
+BOOLEAN
+IsSevGuest (
+  VOID
+  );
+
+/**
+  Determine if SEV-ES is active.
+
+  During early booting, SEV-ES support code will set a flag to indicate that
+  SEV-ES is enabled. Return the value of this flag as an indicator that SEV-ES
+  is enabled.
+
+  @retval TRUE   SEV-ES is enabled
+  @retval FALSE  SEV-ES is not enabled
+
+**/
+BOOLEAN
+SevEsIsEnabled (
+  VOID
+  );
+
+#endif