[PATCH 2/5] ArmPkg: prepare 32bit ARM build of StandaloneMmPkg

["Etienne Carriere" <etienne.carriere@linaro.org>]

This changes modify ArmPkg to prepare building StandaloneMm
firmware for 32bit Arm architectures, factorizing the AArch64
implementation.

This change adds MmCommunicationDxe driver and ArmMmuPeiLib
and ArmmmuStandaloneMmLib libraries to the list of the
standard components build for ArmPkg on when building for an
ARM architecture.

AArch64/ArmMmuStandaloneMmLib.c is moved to its parent
directory and built for both 32bit and 64bit architectures.

This change modifies MmCommunication to use macro
ARM_SMC_ID_MM_COMMUNICATE that is defined to the 32bit or
64bit SMC identifier defined in FF-A specification upon the
target architecture.

Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
---
 ArmPkg/ArmPkg.dec                             |  2 +-
 ArmPkg/ArmPkg.dsc                             |  2 +-
 .../MmCommunicationDxe/MmCommunication.c      |  2 +-
 .../{AArch64 => }/ArmMmuStandaloneMmLib.c     | 23 ++++++++++---------
 .../ArmMmuStandaloneMmLib.inf                 |  6 ++---
 5 files changed, 18 insertions(+), 17 deletions(-)
 rename ArmPkg/Library/StandaloneMmMmuLib/{AArch64 => }/ArmMmuStandaloneMmLib.c (90%)

diff --git a/ArmPkg/ArmPkg.dec b/ArmPkg/ArmPkg.dec
index a8a22c649f..07e9930fb0 100644
--- a/ArmPkg/ArmPkg.dec
+++ b/ArmPkg/ArmPkg.dec
@@ -84,7 +84,7 @@
   # hardware coherency (i.e., no virtualization or cache coherent DMA)
   gArmTokenSpaceGuid.PcdNormalMemoryNonshareableOverride|FALSE|BOOLEAN|0x00000043
 
-[PcdsFeatureFlag.AARCH64]
+[PcdsFeatureFlag.AARCH64, PcdsFeatureFlag.ARM]
   ## Used to select method for requesting services from S-EL1.<BR><BR>
   #   TRUE  - Selects FF-A calls for communication between S-EL0 and SPMC.<BR>
   #   FALSE - Selects SVC calls for communication between S-EL0 and SPMC.<BR>
diff --git a/ArmPkg/ArmPkg.dsc b/ArmPkg/ArmPkg.dsc
index 7194eb2d3c..208d609b1b 100644
--- a/ArmPkg/ArmPkg.dsc
+++ b/ArmPkg/ArmPkg.dsc
@@ -151,7 +151,7 @@
   ArmPkg/Universal/Smbios/ProcessorSubClassDxe/ProcessorSubClassDxe.inf
   ArmPkg/Universal/Smbios/SmbiosMiscDxe/SmbiosMiscDxe.inf
 
-[Components.AARCH64]
+[Components.AARCH64, Components.ARM]
   ArmPkg/Drivers/MmCommunicationDxe/MmCommunication.inf
   ArmPkg/Library/ArmMmuLib/ArmMmuPeiLib.inf
   ArmPkg/Library/StandaloneMmMmuLib/ArmMmuStandaloneMmLib.inf
diff --git a/ArmPkg/Drivers/MmCommunicationDxe/MmCommunication.c b/ArmPkg/Drivers/MmCommunicationDxe/MmCommunication.c
index b1e3095809..4ae38a9f22 100644
--- a/ArmPkg/Drivers/MmCommunicationDxe/MmCommunication.c
+++ b/ArmPkg/Drivers/MmCommunicationDxe/MmCommunication.c
@@ -125,7 +125,7 @@ MmCommunication2Communicate (
   }
 
   // SMC Function ID
-  CommunicateSmcArgs.Arg0 = ARM_SMC_ID_MM_COMMUNICATE_AARCH64;
+  CommunicateSmcArgs.Arg0 = ARM_SMC_ID_MM_COMMUNICATE;
 
   // Cookie
   CommunicateSmcArgs.Arg1 = 0;
diff --git a/ArmPkg/Library/StandaloneMmMmuLib/AArch64/ArmMmuStandaloneMmLib.c b/ArmPkg/Library/StandaloneMmMmuLib/ArmMmuStandaloneMmLib.c
similarity index 90%
rename from ArmPkg/Library/StandaloneMmMmuLib/AArch64/ArmMmuStandaloneMmLib.c
rename to ArmPkg/Library/StandaloneMmMmuLib/ArmMmuStandaloneMmLib.c
index 5f453d18e4..77bf3dcedf 100644
--- a/ArmPkg/Library/StandaloneMmMmuLib/AArch64/ArmMmuStandaloneMmLib.c
+++ b/ArmPkg/Library/StandaloneMmMmuLib/ArmMmuStandaloneMmLib.c
@@ -2,6 +2,7 @@
   File managing the MMU for ARMv8 architecture in S-EL0
 
   Copyright (c) 2017 - 2021, Arm Limited. All rights reserved.<BR>
+  Copyright (c) 2021, Linaro Limited
   SPDX-License-Identifier: BSD-2-Clause-Patent
 
   @par Reference(s):
@@ -62,7 +63,7 @@ SendMemoryPermissionRequest (
     // for other Direct Request calls which are not atomic
     // We therefore check only for Direct Response by the
     // callee.
-    if (SvcArgs->Arg0 == ARM_SVC_ID_FFA_MSG_SEND_DIRECT_RESP_AARCH64) {
+    if (SvcArgs->Arg0 == ARM_SVC_ID_FFA_MSG_SEND_DIRECT_RESP) {
       // A Direct Response means FF-A success
       // Now check the payload for errors
       // The callee sends back the return value
@@ -103,8 +104,8 @@ SendMemoryPermissionRequest (
   // Check error response from Callee.
   if (*RetVal & BIT31) {
     // Bit 31 set means there is an error retured
-    // See [1], Section 13.5.5.1 MM_SP_MEMORY_ATTRIBUTES_GET_AARCH64 and
-    // Section 13.5.5.2 MM_SP_MEMORY_ATTRIBUTES_SET_AARCH64.
+    // See [1], Section 13.5.5.1 MM_SP_MEMORY_ATTRIBUTES_GET and
+    // Section 13.5.5.2 MM_SP_MEMORY_ATTRIBUTES_SET.
     switch (*RetVal) {
       case ARM_SVC_SPM_RET_NOT_SUPPORTED:
         return EFI_UNSUPPORTED;
@@ -160,17 +161,17 @@ GetMemoryPermissions (
   }
 
   // Prepare the message parameters.
-  // See [1], Section 13.5.5.1 MM_SP_MEMORY_ATTRIBUTES_GET_AARCH64.
+  // See [1], Section 13.5.5.1 MM_SP_MEMORY_ATTRIBUTES_GET.
   ZeroMem (&SvcArgs, sizeof (ARM_SVC_ARGS));
   if (FeaturePcdGet (PcdFfaEnable)) {
     // See [2], Section 10.2 FFA_MSG_SEND_DIRECT_REQ.
-    SvcArgs.Arg0 = ARM_SVC_ID_FFA_MSG_SEND_DIRECT_REQ_AARCH64;
+    SvcArgs.Arg0 = ARM_SVC_ID_FFA_MSG_SEND_DIRECT_REQ;
     SvcArgs.Arg1 = ARM_FFA_DESTINATION_ENDPOINT_ID;
     SvcArgs.Arg2 = 0;
-    SvcArgs.Arg3 = ARM_SVC_ID_SP_GET_MEM_ATTRIBUTES_AARCH64;
+    SvcArgs.Arg3 = ARM_SVC_ID_SP_GET_MEM_ATTRIBUTES;
     SvcArgs.Arg4 = BaseAddress;
   } else {
-    SvcArgs.Arg0 = ARM_SVC_ID_SP_GET_MEM_ATTRIBUTES_AARCH64;
+    SvcArgs.Arg0 = ARM_SVC_ID_SP_GET_MEM_ATTRIBUTES;
     SvcArgs.Arg1 = BaseAddress;
     SvcArgs.Arg2 = 0;
     SvcArgs.Arg3 = 0;
@@ -215,19 +216,19 @@ RequestMemoryPermissionChange (
   ARM_SVC_ARGS  SvcArgs;
 
   // Prepare the message parameters.
-  // See [1], Section 13.5.5.2 MM_SP_MEMORY_ATTRIBUTES_SET_AARCH64.
+  // See [1], Section 13.5.5.2 MM_SP_MEMORY_ATTRIBUTES_SET.
   ZeroMem (&SvcArgs, sizeof (ARM_SVC_ARGS));
   if (FeaturePcdGet (PcdFfaEnable)) {
     // See [2], Section 10.2 FFA_MSG_SEND_DIRECT_REQ.
-    SvcArgs.Arg0 = ARM_SVC_ID_FFA_MSG_SEND_DIRECT_REQ_AARCH64;
+    SvcArgs.Arg0 = ARM_SVC_ID_FFA_MSG_SEND_DIRECT_REQ;
     SvcArgs.Arg1 = ARM_FFA_DESTINATION_ENDPOINT_ID;
     SvcArgs.Arg2 = 0;
-    SvcArgs.Arg3 = ARM_SVC_ID_SP_SET_MEM_ATTRIBUTES_AARCH64;
+    SvcArgs.Arg3 = ARM_SVC_ID_SP_SET_MEM_ATTRIBUTES;
     SvcArgs.Arg4 = BaseAddress;
     SvcArgs.Arg5 = EFI_SIZE_TO_PAGES (Length);
     SvcArgs.Arg6 = Permissions;
   } else {
-    SvcArgs.Arg0 = ARM_SVC_ID_SP_SET_MEM_ATTRIBUTES_AARCH64;
+    SvcArgs.Arg0 = ARM_SVC_ID_SP_SET_MEM_ATTRIBUTES;
     SvcArgs.Arg1 = BaseAddress;
     SvcArgs.Arg2 = EFI_SIZE_TO_PAGES (Length);
     SvcArgs.Arg3 = Permissions;
diff --git a/ArmPkg/Library/StandaloneMmMmuLib/ArmMmuStandaloneMmLib.inf b/ArmPkg/Library/StandaloneMmMmuLib/ArmMmuStandaloneMmLib.inf
index 89dda509c5..ebb1568279 100644
--- a/ArmPkg/Library/StandaloneMmMmuLib/ArmMmuStandaloneMmLib.inf
+++ b/ArmPkg/Library/StandaloneMmMmuLib/ArmMmuStandaloneMmLib.inf
@@ -16,14 +16,14 @@
   LIBRARY_CLASS                  = StandaloneMmMmuLib
   PI_SPECIFICATION_VERSION       = 0x00010032
 
-[Sources.AARCH64]
-  AArch64/ArmMmuStandaloneMmLib.c
+[Sources]
+  ArmMmuStandaloneMmLib.c
 
 [Packages]
   ArmPkg/ArmPkg.dec
   MdePkg/MdePkg.dec
 
-[FeaturePcd.AARCH64]
+[FeaturePcd.ARM, FeaturePcd.AARCH64]
   gArmTokenSpaceGuid.PcdFfaEnable
 
 [LibraryClasses]
-- 
2.17.1