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-//
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-// Copyright (c) 2011 - 2020, Arm Limited. All rights reserved.<BR>
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-//
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-// SPDX-License-Identifier: BSD-2-Clause-Patent
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-//
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-//
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-
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-#include <AutoGen.h>
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-#include <Chipset/ArmV7.h>
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-
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- INCLUDE AsmMacroIoLib.inc
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-
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- IMPORT CEntryPoint
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- IMPORT ArmPlatformIsPrimaryCore
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- IMPORT ArmReadMpidr
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- IMPORT ArmPlatformPeiBootAction
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- IMPORT ArmPlatformStackSet
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- IMPORT mSystemMemoryEnd
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-
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- EXPORT _ModuleEntryPoint
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-
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- PRESERVE8
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- AREA PrePiCoreEntryPoint, CODE, READONLY
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-
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-StartupAddr DCD CEntryPoint
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-
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-_ModuleEntryPoint
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- // Do early platform specific actions
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- bl ArmPlatformPeiBootAction
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-
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- // Get ID of this CPU in multi-core system
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- bl ArmReadMpidr
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- // Keep a copy of the MpId register value
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- mov r8, r0
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-
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-_SetSVCMode
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- // Enter SVC mode, Disable FIQ and IRQ
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- mov r1, #(CPSR_MODE_SVC :OR: CPSR_IRQ :OR: CPSR_FIQ)
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- msr CPSR_c, r1
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-
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-// Check if we can install the stack at the top of the System Memory or if we need
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-// to install the stacks at the bottom of the Firmware Device (case the FD is located
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-// at the top of the DRAM)
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-_SystemMemoryEndInit
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- adrll r1, mSystemMemoryEnd
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- ldrd r2, r3, [r1]
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- teq r3, #0
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- moveq r1, r2
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- mvnne r1, #0
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-
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-_SetupStackPosition
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- // r1 = SystemMemoryTop
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-
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- // Calculate Top of the Firmware Device
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- mov32 r2, FixedPcdGet32(PcdFdBaseAddress)
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- mov32 r3, FixedPcdGet32(PcdFdSize)
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- sub r3, r3, #1
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- add r3, r3, r2 // r3 = FdTop = PcdFdBaseAddress + PcdFdSize
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-
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- // UEFI Memory Size (stacks are allocated in this region)
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- mov32 r4, FixedPcdGet32(PcdSystemMemoryUefiRegionSize)
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-
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- //
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- // Reserve the memory for the UEFI region (contain stacks on its top)
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- //
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-
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- // Calculate how much space there is between the top of the Firmware and the Top of the System Memory
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- subs r0, r1, r3 // r0 = SystemMemoryTop - FdTop
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- bmi _SetupStack // Jump if negative (FdTop > SystemMemoryTop). Case when the PrePi is in XIP memory outside of the DRAM
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- cmp r0, r4
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- bge _SetupStack
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-
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- // Case the top of stacks is the FdBaseAddress
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- mov r1, r2
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-
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-_SetupStack
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- // r1 contains the top of the stack (and the UEFI Memory)
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-
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- // Because the 'push' instruction is equivalent to 'stmdb' (decrement before), we need to increment
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- // one to the top of the stack. We check if incrementing one does not overflow (case of DRAM at the
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- // top of the memory space)
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- adds r9, r1, #1
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- bcs _SetupOverflowStack
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-
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-_SetupAlignedStack
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- mov r1, r9
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- b _GetBaseUefiMemory
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-
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-_SetupOverflowStack
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- // Case memory at the top of the address space. Ensure the top of the stack is EFI_PAGE_SIZE
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- // aligned (4KB)
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- mov32 r9, EFI_PAGE_MASK
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- and r9, r9, r1
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- sub r1, r1, r9
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-
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-_GetBaseUefiMemory
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- // Calculate the Base of the UEFI Memory
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- sub r9, r1, r4
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-
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-_GetStackBase
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- // r1 = The top of the Mpcore Stacks
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- // Stack for the primary core = PrimaryCoreStack
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- mov32 r2, FixedPcdGet32(PcdCPUCorePrimaryStackSize)
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- sub r10, r1, r2
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-
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- // Stack for the secondary core = Number of Cores - 1
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- mov32 r1, (FixedPcdGet32(PcdCoreCount) - 1) * FixedPcdGet32(PcdCPUCoreSecondaryStackSize)
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- sub r10, r10, r1
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-
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- // r10 = The base of the MpCore Stacks (primary stack & secondary stacks)
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- mov r0, r10
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- mov r1, r8
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- //ArmPlatformStackSet(StackBase, MpId, PrimaryStackSize, SecondaryStackSize)
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- mov32 r2, FixedPcdGet32(PcdCPUCorePrimaryStackSize)
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- mov32 r3, FixedPcdGet32(PcdCPUCoreSecondaryStackSize)
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- bl ArmPlatformStackSet
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-
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- // Is it the Primary Core ?
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- mov r0, r8
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- bl ArmPlatformIsPrimaryCore
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- cmp r0, #1
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- bne _PrepareArguments
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-
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-_PrepareArguments
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- mov r0, r8
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- mov r1, r9
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- mov r2, r10
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-
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- // Move sec startup address into a data register
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- // Ensure we're jumping to FV version of the code (not boot remapped alias)
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- ldr r4, StartupAddr
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-
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- // Jump to PrePiCore C code
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- // r0 = MpId
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- // r1 = UefiMemoryBase
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- // r2 = StacksBase
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- blx r4
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-
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-_NeverReturn
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- b _NeverReturn
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-
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- END
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