1 files changed, 105 insertions, 0 deletions
diff --git a/ArmPlatformPkg/ArmJunoPkg/Library/ArmJunoLib/Arm/ArmJunoHelper.S b/ArmPlatformPkg/ArmJunoPkg/Library/ArmJunoLib/Arm/ArmJunoHelper.S
new file mode 100755
index 000000000..2efb5451b
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+++ b/ArmPlatformPkg/ArmJunoPkg/Library/ArmJunoLib/Arm/ArmJunoHelper.S
@@ -0,0 +1,105 @@
+/** @file
+*
+*  Copyright (c) 2013-2014, 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 <AsmMacroIoLibV8.h>
+#include <Library/ArmLib.h>
+
+.text
+.align 3
+
+GCC_ASM_EXPORT(ArmPlatformPeiBootAction)
+GCC_ASM_EXPORT(ArmPlatformGetCorePosition)
+GCC_ASM_EXPORT(ArmPlatformGetPrimaryCoreMpId)
+GCC_ASM_EXPORT(ArmPlatformIsPrimaryCore)
+
+GCC_ASM_IMPORT(_gPcd_FixedAtBuild_PcdArmPrimaryCoreMask)
+
+
+PrimaryCoreMpid:  .word    0x0
+
+//
+// Return the core position from the value of its MpId register
+//
+// This function returns the core position from the position 0 in the processor.
+// This function might be called from assembler before any stack is set.
+//
+// @return   Return the core position
+//
+//UINTN
+//ArmPlatformGetCorePosition (
+//  IN UINTN MpId
+//  );
+// With this function: CorePos = (ClusterId * 2) + CoreId
+ASM_PFX(ArmPlatformGetCorePosition):
+  and   r1, r0, #ARM_CORE_MASK
+  and   r0, r0, #ARM_CLUSTER_MASK
+  add   r0, r1, r0, LSR #7
+  bx    lr
+
+//
+// Return the MpId of the primary core
+//
+// This function returns the MpId of the primary core.
+// This function might be called from assembler before any stack is set.
+//
+// @return   Return the MpId of the primary core
+//
+//UINTN
+//ArmPlatformGetPrimaryCoreMpId (
+//  VOID
+//  );
+ASM_PFX(ArmPlatformGetPrimaryCoreMpId):
+  ldr   r0, =PrimaryCoreMpid
+  ldr   r0, [r0]
+  bx    lr
+
+//
+// Return a non-zero value if the callee is the primary core
+//
+// This function returns a non-zero value if the callee is the primary core.
+// The primary core is the core responsible to initialize the hardware and run UEFI.
+// This function might be called from assembler before any stack is set.
+//
+//  @return   Return a non-zero value if the callee is the primary core.
+//
+//UINTN
+//ArmPlatformIsPrimaryCore (
+//  IN UINTN MpId
+//  );
+ASM_PFX(ArmPlatformIsPrimaryCore):
+  LoadConstantToReg (_gPcd_FixedAtBuild_PcdArmPrimaryCoreMask, r1)
+  ldr   r1, [r1]
+  and   r0, r0, r1
+
+  ldr   r1, =PrimaryCoreMpid
+  ldr   r1, [r1]
+
+  cmp   r0, r1
+  moveq r0, #1
+  movne r0, #0
+  bx    lr
+
+//
+// First platform specific function to be called in the PEI phase
+//
+// This function is actually the first function called by the PrePi
+// or PrePeiCore modules. It allows to retrieve arguments passed to
+// the UEFI firmware through the CPU registers.
+//
+ASM_PFX(ArmPlatformPeiBootAction):
+  // The trusted firmware passes the primary CPU MPID through r0 register.
+  // Save it in a variable.
+  ldr  r1, =PrimaryCoreMpid
+  str  r0, [r1]
+  bx   lr