From: Sean Brogan <sean.brogan@microsoft.com>
After adding the abstract MmuLib to MdePkg, add an implementation
backed by the existing ArmMmuLib to ArmPkg.
This implementation is currently just a shim to the
old library, while enabling higher-level code to be more
common.
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3651
Cc: Leif Lindholm <leif@nuviainc.com>
Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Sean Brogan <sean.brogan@microsoft.com>
Signed-off-by: Bret Barkelew <bret.barkelew@microsoft.com>
---
ArmPkg/Library/MmuLib/MmuLib.c | 120 ++++++++++++++++++++
ArmPkg/ArmPkg.dsc | 1 +
ArmPkg/Library/MmuLib/BaseMmuLib.inf | 30 +++++
3 files changed, 151 insertions(+)
diff --git a/ArmPkg/Library/MmuLib/MmuLib.c b/ArmPkg/Library/MmuLib/MmuLib.c
new file mode 100644
index 000000000000..6f3b664971da
--- /dev/null
+++ b/ArmPkg/Library/MmuLib/MmuLib.c
@@ -0,0 +1,120 @@
+/** @file
+This library instance implements a very limited MMU Lib instance
+for the ARM/AARCH64 architectures. This library shims a common library
+interface to the ArmPkg defined ArmMmuLib.ib.
+
+Copyright (c) Microsoft Corporation.
+SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <Library/ArmMmuLib.h>
+#include <Library/DebugLib.h>
+#include <Library/MmuLib.h>
+
+/**
+ Bitwise sets the memory attributes on a range of memory based on an attributes mask.
+
+ @param BaseAddress The start of the range for which to set attributes.
+ @param Length The length of the range.
+ @param Attributes A bitmask of the attributes to set. See "Physical memory
+ protection attributes" in UefiSpec.h
+
+ @return EFI_SUCCESS
+ @return Others
+
+**/
+EFI_STATUS
+EFIAPI
+MmuSetAttributes (
+ IN EFI_PHYSICAL_ADDRESS BaseAddress,
+ IN UINT64 Length,
+ IN UINT64 Attributes
+ )
+{
+ EFI_STATUS Status;
+
+ Status = EFI_UNSUPPORTED;
+
+ if ((Attributes & EFI_MEMORY_XP) == EFI_MEMORY_XP) {
+ Status = ArmSetMemoryRegionNoExec (BaseAddress, Length);
+ if (EFI_ERROR(Status)) {
+ DEBUG((DEBUG_ERROR, "%a - Failed to set NX. Status = %r\n", __FUNCTION__, Status));
+ }
+ }
+
+ ASSERT_EFI_ERROR(Status);
+ return Status;
+}
+
+
+/**
+ Bitwise clears the memory attributes on a range of memory based on an attributes mask.
+
+ @param BaseAddress The start of the range for which to clear attributes.
+ @param Length The length of the range.
+ @param Attributes A bitmask of the attributes to clear. See "Physical memory
+ protection attributes" in UefiSpec.h
+
+ @return EFI_SUCCESS
+ @return Others
+
+**/
+EFI_STATUS
+EFIAPI
+MmuClearAttributes (
+ IN EFI_PHYSICAL_ADDRESS BaseAddress,
+ IN UINT64 Length,
+ IN UINT64 Attributes
+ )
+{
+ EFI_STATUS Status;
+
+ Status = EFI_UNSUPPORTED;
+
+ if ((Attributes & EFI_MEMORY_XP) == EFI_MEMORY_XP) {
+ Status = ArmClearMemoryRegionNoExec (BaseAddress, Length);
+ if (EFI_ERROR(Status)) {
+ DEBUG((DEBUG_ERROR, "%a - Failed to clear NX. Status = %r\n", __FUNCTION__, Status));
+ }
+ }
+
+ if ((Attributes & EFI_MEMORY_RO) == EFI_MEMORY_RO) {
+ Status = ArmClearMemoryRegionReadOnly(BaseAddress, Length);
+ if (EFI_ERROR(Status)) {
+ DEBUG((DEBUG_ERROR, "%a - Failed to clear RO. Status = %r\n", __FUNCTION__, Status));
+ }
+ }
+
+ ASSERT_EFI_ERROR(Status);
+ return Status;
+}
+
+
+/**
+ Returns the memory attributes on a range of memory.
+
+ @param BaseAddress The start of the range for which to set attributes.
+ @param Attributes A return pointer for the attributes.
+
+ @return EFI_SUCCESS
+ @return EFI_INVALID_PARAMETER A return pointer is NULL.
+ @return Others
+
+**/
+EFI_STATUS
+EFIAPI
+MmuGetAttributes (
+ IN EFI_PHYSICAL_ADDRESS BaseAddress,
+ OUT UINT64 *Attributes
+ )
+{
+ EFI_STATUS Status;
+
+ Status = EFI_UNSUPPORTED;
+
+ DEBUG ((DEBUG_ERROR, "%a() API not implemented\n", __FUNCTION__));
+
+ ASSERT_EFI_ERROR(Status);
+ return Status;
+}
diff --git a/ArmPkg/ArmPkg.dsc b/ArmPkg/ArmPkg.dsc
index f9268de8347e..197519a64718 100644
--- a/ArmPkg/ArmPkg.dsc
+++ b/ArmPkg/ArmPkg.dsc
@@ -165,3 +165,4 @@ [Components.AARCH64]
[Components.AARCH64, Components.ARM]
ArmPkg/Library/StandaloneMmMmuLib/ArmMmuStandaloneMmLib.inf
+ ArmPkg/Library/MmuLib/BaseMmuLib.inf
diff --git a/ArmPkg/Library/MmuLib/BaseMmuLib.inf b/ArmPkg/Library/MmuLib/BaseMmuLib.inf
new file mode 100644
index 000000000000..15095abee9c3
--- /dev/null
+++ b/ArmPkg/Library/MmuLib/BaseMmuLib.inf
@@ -0,0 +1,30 @@
+## @file
+# This library instance implements a very limited MMU Lib instance
+# for the ARM/AARCH64 architectures. This library shims a common library
+# interface to the ArmPkg defined ArmMmuLib.
+#
+# Copyright (c) Microsoft Corporation.
+#
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##
+
+[Defines]
+ INF_VERSION = 0x00010005
+ BASE_NAME = MmuLib
+ FILE_GUID = 6f2ee9a4-79b3-4b77-9a47-e2bd4b917b75
+ MODULE_TYPE = BASE
+ VERSION_STRING = 1.0
+ LIBRARY_CLASS = MmuLib
+
+[Sources]
+ MmuLib.c
+
+[Packages]
+ MdePkg/MdePkg.dec
+ MdeModulePkg/MdeModulePkg.dec
+ ArmPkg/ArmPkg.dec
+
+[LibraryClasses]
+ DebugLib
+ ArmMmuLib
--
2.31.1.windows.1
-=-=-=-=-=-=-=-=-=-=-=-
Groups.io Links: You receive all messages sent to this group.
View/Reply Online (#83621): https://edk2.groups.io/g/devel/message/83621
Mute This Topic: https://groups.io/mt/86971568/1787277
Group Owner: devel+owner@edk2.groups.io
Unsubscribe: https://edk2.groups.io/g/devel/unsub [importer@patchew.org]
-=-=-=-=-=-=-=-=-=-=-=-