1 files changed, 130 insertions, 0 deletions
diff --git a/BeagleBoardPkg/PrePi/Arm/ModuleEntryPoint.S b/BeagleBoardPkg/PrePi/Arm/ModuleEntryPoint.S
new file mode 100644
index 0000000000..212cab62d4
--- /dev/null
+++ b/BeagleBoardPkg/PrePi/Arm/ModuleEntryPoint.S
@@ -0,0 +1,130 @@
+//
+//  Copyright (c) 2011-2015, 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 <Chipset/ArmV7.h>
+
+ASM_FUNC(_ModuleEntryPoint)
+  // Do early platform specific actions
+  bl    ASM_PFX(ArmPlatformPeiBootAction)
+
+  // Get ID of this CPU in Multicore system
+  bl    ASM_PFX(ArmReadMpidr)
+  // Keep a copy of the MpId register value
+  mov   r8, r0
+
+_SetSVCMode:
+  // Enter SVC mode, Disable FIQ and IRQ
+  mov     r1, #(CPSR_MODE_SVC | CPSR_IRQ | CPSR_FIQ)
+  msr     CPSR_c, r1
+
+// Check if we can install the stack at the top of the System Memory or if we need
+// to install the stacks at the bottom of the Firmware Device (case the FD is located
+// at the top of the DRAM)
+_SystemMemoryEndInit:
+  ADRL  (r1, mSystemMemoryEnd)
+  ldrd  r2, r3, [r1]
+  teq   r3, #0
+  moveq r1, r2
+  mvnne r1, #0
+
+_SetupStackPosition:
+  // r1 = SystemMemoryTop
+
+  // Calculate Top of the Firmware Device
+  MOV32 (r2, FixedPcdGet32(PcdFdBaseAddress))
+  MOV32 (r3, FixedPcdGet32(PcdFdSize) - 1)
+  add   r3, r3, r2      // r3 = FdTop = PcdFdBaseAddress + PcdFdSize
+
+  // UEFI Memory Size (stacks are allocated in this region)
+  MOV32 (r4, FixedPcdGet32(PcdSystemMemoryUefiRegionSize))
+
+  //
+  // Reserve the memory for the UEFI region (contain stacks on its top)
+  //
+
+  // Calculate how much space there is between the top of the Firmware and the Top of the System Memory
+  subs  r0, r1, r3      // r0 = SystemMemoryTop - FdTop
+  bmi   _SetupStack     // Jump if negative (FdTop > SystemMemoryTop). Case when the PrePi is in XIP memory outside of the DRAM
+  cmp   r0, r4
+  bge   _SetupStack
+
+  // Case the top of stacks is the FdBaseAddress
+  mov   r1, r2
+
+_SetupStack:
+  // r1 contains the top of the stack (and the UEFI Memory)
+
+  // Because the 'push' instruction is equivalent to 'stmdb' (decrement before), we need to increment
+  // one to the top of the stack. We check if incrementing one does not overflow (case of DRAM at the
+  // top of the memory space)
+  adds  r9, r1, #1
+  bcs   _SetupOverflowStack
+
+_SetupAlignedStack:
+  mov   r1, r9
+  b     _GetBaseUefiMemory
+
+_SetupOverflowStack:
+  // Case memory at the top of the address space. Ensure the top of the stack is EFI_PAGE_SIZE
+  // aligned (4KB)
+  MOV32 (r9, ~EFI_PAGE_MASK & 0xFFFFFFFF)
+  and   r1, r1, r9
+
+_GetBaseUefiMemory:
+  // Calculate the Base of the UEFI Memory
+  sub   r9, r1, r4
+
+_GetStackBase:
+  // r1 = The top of the Mpcore Stacks
+  // Stack for the primary core = PrimaryCoreStack
+  MOV32 (r2, FixedPcdGet32(PcdCPUCorePrimaryStackSize))
+  sub   r10, r1, r2
+
+  // Stack for the secondary core = Number of Cores - 1
+  MOV32 (r1, (FixedPcdGet32(PcdCoreCount) - 1) * FixedPcdGet32(PcdCPUCoreSecondaryStackSize))
+  sub   r10, r10, r1
+
+  // r10 = The base of the MpCore Stacks (primary stack & secondary stacks)
+  mov   r0, r10
+  mov   r1, r8
+  //ArmPlatformStackSet(StackBase, MpId, PrimaryStackSize, SecondaryStackSize)
+  MOV32 (r2, FixedPcdGet32(PcdCPUCorePrimaryStackSize))
+  MOV32 (r3, FixedPcdGet32(PcdCPUCoreSecondaryStackSize))
+  bl    ASM_PFX(ArmPlatformStackSet)
+
+  // Is it the Primary Core ?
+  mov   r0, r8
+  bl    ASM_PFX(ArmPlatformIsPrimaryCore)
+  cmp   r0, #1
+  bne   _PrepareArguments
+
+_PrepareArguments:
+  mov   r0, r8
+  mov   r1, r9
+  mov   r2, r10
+  mov   r3, sp
+
+  // Move sec startup address into a data register
+  // Ensure we're jumping to FV version of the code (not boot remapped alias)
+  ldr   r4, =ASM_PFX(CEntryPoint)
+
+  // Jump to PrePiCore C code
+  //    r0 = MpId
+  //    r1 = UefiMemoryBase
+  //    r2 = StacksBase
+  blx   r4
+
+_NeverReturn:
+  b _NeverReturn