From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received-SPF: Pass (sender SPF authorized) identity=mailfrom; client-ip=217.140.101.70; helo=foss.arm.com; envelope-from=supreeth.venkatesh@arm.com; receiver=edk2-devel@lists.01.org Received: from foss.arm.com (usa-sjc-mx-foss1.foss.arm.com [217.140.101.70]) by ml01.01.org (Postfix) with ESMTP id DA6AE210E2A55 for ; Tue, 3 Jul 2018 02:56:08 -0700 (PDT) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id B9EF680D; Tue, 3 Jul 2018 02:56:08 -0700 (PDT) Received: from usa.arm.com (a074948-lin.blr.arm.com [10.162.4.138]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id EA3773F5A0; Tue, 3 Jul 2018 02:56:06 -0700 (PDT) From: Supreeth Venkatesh To: edk2-devel@lists.01.org Date: Tue, 3 Jul 2018 15:25:13 +0530 Message-Id: <1530611715-9819-5-git-send-email-supreeth.venkatesh@arm.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1530611715-9819-1-git-send-email-supreeth.venkatesh@arm.com> References: <1530611715-9819-1-git-send-email-supreeth.venkatesh@arm.com> Subject: [PATCH 4/6] ArmPkg/ArmMmuLib: Add MMU Library suitable for use in S-EL0. X-BeenThere: edk2-devel@lists.01.org X-Mailman-Version: 2.1.26 Precedence: list List-Id: EDK II Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 03 Jul 2018 09:56:09 -0000 The Standalone MM environment runs in S-EL0 in AArch64 on ARM Standard Platforms. Privileged firmware e.g. ARM Trusted Firmware sets up its architectural context including the initial translation tables for the S-EL1/EL0 translation regime. The MM environment will still request ARM TF to change the memory attributes of memory regions during initialization. The Standalone MM image is a FV that encapsulates the MM foundation and drivers. These are PE-COFF images with data and text segments. To initialise the MM environment, Arm Trusted Firmware has to create translation tables with sane default attributes for the memory occupied by the FV. This library sends SVCs to ARM Trusted Firmware to request memory permissions change for data and text segments. This patch adds a simple MMU library suitable for execution in S-EL0 and requesting memory permissions change operations from Arm Trusted Firmware. Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Achin Gupta Signed-off-by: Supreeth Venkatesh Cc: Leif Lindholm Cc: Ard Biesheuvel --- .../ArmMmuLib/AArch64/ArmMmuStandaloneMmCoreLib.c | 195 +++++++++++++++++++++ 1 file changed, 195 insertions(+) create mode 100644 ArmPkg/Library/ArmMmuLib/AArch64/ArmMmuStandaloneMmCoreLib.c diff --git a/ArmPkg/Library/ArmMmuLib/AArch64/ArmMmuStandaloneMmCoreLib.c b/ArmPkg/Library/ArmMmuLib/AArch64/ArmMmuStandaloneMmCoreLib.c new file mode 100644 index 0000000..0f5e68d --- /dev/null +++ b/ArmPkg/Library/ArmMmuLib/AArch64/ArmMmuStandaloneMmCoreLib.c @@ -0,0 +1,195 @@ +/** @file +* File managing the MMU for ARMv8 architecture in S-EL0 +* +* Copyright (c) 2017 - 2018, ARM Limited. All rights reserved. +* +* 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. +* +**/ + +#include +#include +#include + +#include +#include +#include +#include +#include + +EFI_STATUS +GetMemoryPermissions ( + IN EFI_PHYSICAL_ADDRESS BaseAddress, + OUT UINT32 *MemoryAttributes + ) +{ + ARM_SVC_ARGS GetMemoryPermissionsSvcArgs = {0}; + + GetMemoryPermissionsSvcArgs.Arg0 = ARM_SVC_ID_SP_GET_MEM_ATTRIBUTES_AARCH64; + GetMemoryPermissionsSvcArgs.Arg1 = BaseAddress; + GetMemoryPermissionsSvcArgs.Arg2 = 0; + GetMemoryPermissionsSvcArgs.Arg3 = 0; + + ArmCallSvc (&GetMemoryPermissionsSvcArgs); + if (GetMemoryPermissionsSvcArgs.Arg0 == ARM_SVC_SPM_RET_INVALID_PARAMS) { + *MemoryAttributes = 0; + return EFI_INVALID_PARAMETER; + } + + *MemoryAttributes = GetMemoryPermissionsSvcArgs.Arg0; + return EFI_SUCCESS; +} + +EFI_STATUS +RequestMemoryPermissionChange ( + IN EFI_PHYSICAL_ADDRESS BaseAddress, + IN UINT64 Length, + IN UINTN Permissions + ) +{ + EFI_STATUS Status; + ARM_SVC_ARGS ChangeMemoryPermissionsSvcArgs = {0}; + + ChangeMemoryPermissionsSvcArgs.Arg0 = ARM_SVC_ID_SP_SET_MEM_ATTRIBUTES_AARCH64; + ChangeMemoryPermissionsSvcArgs.Arg1 = BaseAddress; + ChangeMemoryPermissionsSvcArgs.Arg2 = (Length >= EFI_PAGE_SIZE) ? \ + Length >> EFI_PAGE_SHIFT : 1; + ChangeMemoryPermissionsSvcArgs.Arg3 = Permissions; + + ArmCallSvc (&ChangeMemoryPermissionsSvcArgs); + + Status = ChangeMemoryPermissionsSvcArgs.Arg0; + + switch (Status) { + case ARM_SVC_SPM_RET_SUCCESS: + Status = EFI_SUCCESS; + break; + + case ARM_SVC_SPM_RET_NOT_SUPPORTED: + Status = EFI_UNSUPPORTED; + break; + + case ARM_SVC_SPM_RET_INVALID_PARAMS: + Status = EFI_INVALID_PARAMETER; + break; + + case ARM_SVC_SPM_RET_DENIED: + Status = EFI_ACCESS_DENIED; + break; + + case ARM_SVC_SPM_RET_NO_MEMORY: + Status = EFI_BAD_BUFFER_SIZE; + break; + + default: + Status = EFI_ACCESS_DENIED; + ASSERT (0); + } + + return Status; +} + +EFI_STATUS +ArmSetMemoryRegionNoExec ( + IN EFI_PHYSICAL_ADDRESS BaseAddress, + IN UINT64 Length + ) +{ + EFI_STATUS Status; + UINT32 MemoryAttributes; + + Status = GetMemoryPermissions (BaseAddress, &MemoryAttributes); + if (Status != EFI_INVALID_PARAMETER) { + return RequestMemoryPermissionChange (BaseAddress, + Length, + MemoryAttributes | + (SET_MEM_ATTR_CODE_PERM_XN << SET_MEM_ATTR_CODE_PERM_SHIFT)); + } + return EFI_INVALID_PARAMETER; +} + +EFI_STATUS +ArmClearMemoryRegionNoExec ( + IN EFI_PHYSICAL_ADDRESS BaseAddress, + IN UINT64 Length + ) +{ + EFI_STATUS Status; + UINT32 MemoryAttributes; + + Status = GetMemoryPermissions (BaseAddress, &MemoryAttributes); + if (Status != EFI_INVALID_PARAMETER) { + return RequestMemoryPermissionChange (BaseAddress, + Length, + MemoryAttributes & + ~(SET_MEM_ATTR_CODE_PERM_XN << SET_MEM_ATTR_CODE_PERM_SHIFT)); + } + return EFI_INVALID_PARAMETER; +} + +EFI_STATUS +ArmSetMemoryRegionReadOnly ( + IN EFI_PHYSICAL_ADDRESS BaseAddress, + IN UINT64 Length + ) +{ + EFI_STATUS Status; + UINT32 MemoryAttributes; + + Status = GetMemoryPermissions (BaseAddress, &MemoryAttributes); + if (Status != EFI_INVALID_PARAMETER) { + return RequestMemoryPermissionChange (BaseAddress, + Length, + MemoryAttributes | + (SET_MEM_ATTR_DATA_PERM_RO << SET_MEM_ATTR_DATA_PERM_SHIFT)); + } + return EFI_INVALID_PARAMETER; +} + +EFI_STATUS +ArmClearMemoryRegionReadOnly ( + IN EFI_PHYSICAL_ADDRESS BaseAddress, + IN UINT64 Length + ) +{ + EFI_STATUS Status; + UINT32 MemoryAttributes; + + Status = GetMemoryPermissions (BaseAddress, &MemoryAttributes); + if (Status != EFI_INVALID_PARAMETER) { + return RequestMemoryPermissionChange (BaseAddress, + Length, + SET_MEM_ATTR_MAKE_PERM_REQUEST + ( \ + SET_MEM_ATTR_DATA_PERM_RW, \ + MemoryAttributes)); + } + return EFI_INVALID_PARAMETER; +} + +EFI_STATUS +EFIAPI +ArmConfigureMmu ( + IN ARM_MEMORY_REGION_DESCRIPTOR *MemoryTable, + OUT VOID **TranslationTableBase OPTIONAL, + OUT UINTN *TranslationTableSize OPTIONAL + ) +{ + return EFI_UNSUPPORTED; +} + +EFI_STATUS +EFIAPI +ArmMmuStandaloneMmCoreLibConstructor ( + IN EFI_HANDLE ImageHandle, + IN EFI_MM_SYSTEM_TABLE *MmSystemTable + ) +{ + return EFI_SUCCESS; +} -- 2.7.4