ArmPlatformPkg: Moved ARMv7 specific files to a 'Arm' subdirectory

[mirror_edk2.git] / ArmPlatformPkg / PrePeiCore / Arm / PrePeiCoreEntryPoint.asm

diff --git a/ArmPlatformPkg/PrePeiCore/Arm/PrePeiCoreEntryPoint.asm b/ArmPlatformPkg/PrePeiCore/Arm/PrePeiCoreEntryPoint.asm
new file mode 100644 (file)
index 0000000..a3dd1fb
--- /dev/null
+++ b/ArmPlatformPkg/PrePeiCore/Arm/PrePeiCoreEntryPoint.asm
@@ -0,0 +1,89 @@
+//\r
+//  Copyright (c) 2011, ARM Limited. All rights reserved.\r
+//  \r
+//  This program and the accompanying materials                          \r
+//  are licensed and made available under the terms and conditions of the BSD License         \r
+//  which accompanies this distribution.  The full text of the license may be found at        \r
+//  http://opensource.org/licenses/bsd-license.php                                            \r
+//\r
+//  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,                     \r
+//  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.             \r
+//\r
+//\r
+\r
+#include <AsmMacroIoLib.h>\r
+#include <Base.h>\r
+#include <Library/PcdLib.h>\r
+#include <AutoGen.h>\r
+\r
+  INCLUDE AsmMacroIoLib.inc\r
+  \r
+  IMPORT  CEntryPoint\r
+  IMPORT  ArmReadMpidr\r
+  EXPORT  _ModuleEntryPoint\r
+  \r
+  PRESERVE8\r
+  AREA    PrePeiCoreEntryPoint, CODE, READONLY\r
+  \r
+StartupAddr        DCD      CEntryPoint\r
+\r
+_ModuleEntryPoint\r
+  // Identify CPU ID\r
+  bl    ArmReadMpidr\r
+  // Get ID of this CPU in Multicore system\r
+  LoadConstantToReg (FixedPcdGet32(PcdArmPrimaryCoreMask), r1)\r
+  and   r5, r0, r1\r
+  \r
+  // Get the top of the primary stacks (and the base of the secondary stacks)\r
+  LoadConstantToReg (FixedPcdGet32(PcdCPUCoresStackBase), r1)\r
+  LoadConstantToReg (FixedPcdGet32(PcdCPUCorePrimaryStackSize), r2)\r
+  add   r1, r1, r2\r
+\r
+  // Is it the Primary Core ?\r
+  LoadConstantToReg (FixedPcdGet32(PcdArmPrimaryCore), r3)\r
+  cmp   r5, r3\r
+  beq   _SetupPrimaryCoreStack\r
+\r
+_SetupSecondaryCoreStack\r
+  // r1 contains the base of the secondary stacks\r
+\r
+  // Get the Core Position (ClusterId * 4) + CoreId\r
+  GetCorePositionFromMpId(r0, r5, r2)\r
+  // The stack starts at the top of the stack region. Add '1' to the Core Position to get the top of the stack\r
+  add   r0, r0, #1\r
+\r
+  // StackOffset = CorePos * StackSize\r
+  LoadConstantToReg (FixedPcdGet32(PcdCPUCoreSecondaryStackSize), r2)\r
+  mul   r0, r0, r2\r
+  // SP = StackBase + StackOffset\r
+  add   sp, r1, r0\r
+\r
+_PrepareArguments\r
+  // The PEI Core Entry Point has been computed by GenFV and stored in the second entry of the Reset Vector\r
+  LoadConstantToReg (FixedPcdGet32(PcdFvBaseAddress), r2)\r
+  add   r2, r2, #4\r
+  ldr   r1, [r2]\r
+\r
+  // Move sec startup address into a data register\r
+  // Ensure we're jumping to FV version of the code (not boot remapped alias)\r
+  ldr   r3, StartupAddr\r
+  \r
+  // Jump to PrePeiCore C code\r
+  //    r0 = mp_id\r
+  //    r1 = pei_core_address\r
+  mov   r0, r5\r
+  blx   r3\r
+\r
+_SetupPrimaryCoreStack\r
+  // r1 contains the top of the primary stack\r
+  LoadConstantToReg (FixedPcdGet32(PcdPeiGlobalVariableSize), r2)\r
+\r
+  // The reserved space for global variable must be 8-bytes aligned for pushing\r
+  // 64-bit variable on the stack\r
+  SetPrimaryStack (r1, r2, r3)\r
+  b     _PrepareArguments\r
+\r
+_NeverReturn\r
+  b _NeverReturn\r
+\r
+  END\r