ArmPlatformPkg: Added Aarch64 Foundation Model

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Harry Liebel <Harry.Liebel@arm.com>
Signed-off-by: Olivier Martin <olivier.martin@arm.com>



git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@14495 6f19259b-4bc3-4df7-8a09-765794883524

ArmPlatformPkg/ArmVExpressPkg/Library/ArmVExpressSecLibRTSM/AArch64/RTSMFoundationBoot.S

@@ -0,0 +1,75 @@
+//
+//  Copyright (c) 2011-2013, 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 <AsmMacroIoLib.h>
+#include <Base.h>
+#include <Library/ArmPlatformLib.h>
+#include <AutoGen.h>
+#include <ArmPlatform.h>
+
+.text
+.align 3
+
+ASM_GLOBAL ASM_PFX(ArmPlatformSecBootAction)
+ASM_GLOBAL ASM_PFX(ArmPlatformSecBootMemoryInit)
+ASM_GLOBAL ASM_PFX(ArmSecMpCoreSecondariesWrite)
+ASM_GLOBAL ASM_PFX(ArmSecMpCoreSecondariesRead)
+
+/**
+  Call at the beginning of the platform boot up
+
+  This function allows the firmware platform to do extra actions at the early
+  stage of the platform power up.
+
+  Note: This function must be implemented in assembler as there is no stack set up yet
+
+**/
+ASM_PFX(ArmPlatformSecBootAction):
+  ret
+
+/**
+  Initialize the memory where the initial stacks will reside
+
+  This memory can contain the initial stacks (Secure and Secure Monitor stacks).
+  In some platform, this region is already initialized and the implementation of this function can
+  do nothing. This memory can also represent the Secure RAM.
+  This function is called before the stack has been set up. Its implementation must ensure the stack
+  pointer is not used (probably required to use assembly language)
+
+**/
+ASM_PFX(ArmPlatformSecBootMemoryInit):
+  // The SMC does not need to be initialized for RTSM
+  ret
+
+
+// NOTE:
+// The foundation model does not have the VE_SYS_REGS like all the other VE
+// platforms. We pick a spot in RAM that *should* be safe in the simple case
+// of no UEFI apps interfering (Only the Linux loader getting used). By the
+// time we come to load Linux we should have all the cores in a safe place.
+// The image expects to be loaded at 0xa0000000. We also place the mailboxes
+// here as it does not matter if we corrupt the image at this time.
+// NOTE also see: "ArmVExpressLibRTSM/RTSMFoundation.c"
+
+/* Write the flag register used to start Secondary cores */
+ASM_PFX(ArmSecMpCoreSecondariesWrite):
+  ldr x1, =0xa0000000
+  str w0, [x1]
+  ret
+
+
+/* Read the flag register used to start Secondary cores */
+ASM_PFX(ArmSecMpCoreSecondariesRead):
+  ldr x1, =0xa0000000
+  ldr w0, [x1]
+  ret