mirror of https://github.com/acidanthera/audk.git
63 lines
1.7 KiB
C
63 lines
1.7 KiB
C
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/**@file
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Initialize Secure Encrypted Virtualization (SEV) support
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Copyright (c) 2017, Advanced Micro Devices. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD
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License which accompanies this distribution. The full text of the license
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may be found at http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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//
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// The package level header files this module uses
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//
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#include <PiPei.h>
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#include <Library/DebugLib.h>
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#include <Library/PcdLib.h>
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#include <Register/Cpuid.h>
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#include <Register/Amd/Cpuid.h>
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#include <Library/MemEncryptSevLib.h>
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/**
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Function checks if SEV support is available, if present then it sets
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the dynamic PcdPteMemoryEncryptionAddressOrMask with memory encryption mask.
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**/
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VOID
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EFIAPI
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AmdSevInitialize (
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VOID
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)
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{
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CPUID_MEMORY_ENCRYPTION_INFO_EBX Ebx;
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UINT64 EncryptionMask;
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RETURN_STATUS PcdStatus;
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//
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// Check if SEV is enabled
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//
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if (!MemEncryptSevIsEnabled ()) {
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return;
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}
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//
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// CPUID Fn8000_001F[EBX] Bit 0:5 (memory encryption bit position)
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//
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AsmCpuid (CPUID_MEMORY_ENCRYPTION_INFO, NULL, &Ebx.Uint32, NULL, NULL);
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EncryptionMask = LShiftU64 (1, Ebx.Bits.PtePosBits);
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//
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// Set Memory Encryption Mask PCD
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//
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PcdStatus = PcdSet64S (PcdPteMemoryEncryptionAddressOrMask, EncryptionMask);
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ASSERT_RETURN_ERROR (PcdStatus);
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DEBUG ((DEBUG_INFO, "SEV is enabled (mask 0x%lx)\n", EncryptionMask));
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}
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