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MdeModulePkg/Core/DxeIplPeim: Add support for PCD PcdPteMemoryEncryptionAddressOrMask

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This PCD holds the address mask for page table entries when memory
encryption is enabled on AMD processors supporting the Secure Encrypted
Virtualization (SEV) feature.

The mask is applied when creating page tables.

Cc: Feng Tian <feng.tian@intel.com>
Cc: Star Zeng <star.zeng@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Brijesh Singh <brijesh.singh@amd.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Leo Duran <leo.duran@amd.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>
This commit is contained in:
Leo Duran
2017-02-27 01:43:03 +08:00
committed by Star Zeng
parent e043f7895b
commit 5997daf742
4 changed files with 50 additions and 11 deletions
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12
MdeModulePkg/Core/DxeIplPeim/Ia32/DxeLoadFunc.c
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@@ -2,6 +2,8 @@
Ia32-specific functionality for DxeLoad.
Copyright (c) 2006 - 2015, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2017, AMD Incorporated. 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
@@ -82,6 +84,12 @@ Create4GPageTablesIa32Pae (
PAGE_TABLE_ENTRY *PageDirectoryEntry;
UINTN TotalPagesNum;
UINTN PageAddress;
UINT64 AddressEncMask;
//
// Make sure AddressEncMask is contained to smallest supported address field
//
AddressEncMask = PcdGet64 (PcdPteMemoryEncryptionAddressOrMask) & PAGING_1G_ADDRESS_MASK_64;
PhysicalAddressBits = 32;
@@ -111,7 +119,7 @@ Create4GPageTablesIa32Pae (
//
// Fill in a Page Directory Pointer Entries
//
PageDirectoryPointerEntry->Uint64 = (UINT64) (UINTN) PageDirectoryEntry;
PageDirectoryPointerEntry->Uint64 = (UINT64) (UINTN) PageDirectoryEntry | AddressEncMask;
PageDirectoryPointerEntry->Bits.Present = 1;
for (IndexOfPageDirectoryEntries = 0; IndexOfPageDirectoryEntries < 512; IndexOfPageDirectoryEntries++, PageDirectoryEntry++, PhysicalAddress += SIZE_2MB) {
@@ -124,7 +132,7 @@ Create4GPageTablesIa32Pae (
//
// Fill in the Page Directory entries
//
PageDirectoryEntry->Uint64 = (UINT64) PhysicalAddress;
PageDirectoryEntry->Uint64 = (UINT64) PhysicalAddress | AddressEncMask;
PageDirectoryEntry->Bits.ReadWrite = 1;
PageDirectoryEntry->Bits.Present = 1;
PageDirectoryEntry->Bits.MustBe1 = 1;