mirror of https://github.com/acidanthera/audk.git
70 lines
1.9 KiB
C
70 lines
1.9 KiB
C
/**@file
|
|
Initialize Secure Encrypted Virtualization (SEV) support
|
|
|
|
Copyright (c) 2017, Advanced Micro Devices. All rights reserved.<BR>
|
|
|
|
This program and the accompanying materials
|
|
are licensed and made available under the terms and conditions of the BSD
|
|
License which accompanies this distribution. The full text of the license
|
|
may be found at http://opensource.org/licenses/bsd-license.php
|
|
|
|
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
|
|
|
|
**/
|
|
//
|
|
// The package level header files this module uses
|
|
//
|
|
#include <PiPei.h>
|
|
|
|
#include <Library/DebugLib.h>
|
|
#include <Library/PcdLib.h>
|
|
#include <Register/Cpuid.h>
|
|
#include <Register/Amd/Cpuid.h>
|
|
#include <Library/MemEncryptSevLib.h>
|
|
|
|
/**
|
|
|
|
Function checks if SEV support is available, if present then it sets
|
|
the dynamic PcdPteMemoryEncryptionAddressOrMask with memory encryption mask.
|
|
|
|
**/
|
|
VOID
|
|
EFIAPI
|
|
AmdSevInitialize (
|
|
VOID
|
|
)
|
|
{
|
|
CPUID_MEMORY_ENCRYPTION_INFO_EBX Ebx;
|
|
UINT64 EncryptionMask;
|
|
RETURN_STATUS PcdStatus;
|
|
|
|
//
|
|
// Check if SEV is enabled
|
|
//
|
|
if (!MemEncryptSevIsEnabled ()) {
|
|
return;
|
|
}
|
|
|
|
//
|
|
// CPUID Fn8000_001F[EBX] Bit 0:5 (memory encryption bit position)
|
|
//
|
|
AsmCpuid (CPUID_MEMORY_ENCRYPTION_INFO, NULL, &Ebx.Uint32, NULL, NULL);
|
|
EncryptionMask = LShiftU64 (1, Ebx.Bits.PtePosBits);
|
|
|
|
//
|
|
// Set Memory Encryption Mask PCD
|
|
//
|
|
PcdStatus = PcdSet64S (PcdPteMemoryEncryptionAddressOrMask, EncryptionMask);
|
|
ASSERT_RETURN_ERROR (PcdStatus);
|
|
|
|
DEBUG ((DEBUG_INFO, "SEV is enabled (mask 0x%lx)\n", EncryptionMask));
|
|
|
|
//
|
|
// Set Pcd to Deny the execution of option ROM when security
|
|
// violation.
|
|
//
|
|
PcdStatus = PcdSet32S (PcdOptionRomImageVerificationPolicy, 0x4);
|
|
ASSERT_RETURN_ERROR (PcdStatus);
|
|
}
|