mirror of https://github.com/acidanthera/audk.git
171 lines
5.2 KiB
NASM
171 lines
5.2 KiB
NASM
//
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// Copyright (c) 2011, ARM Limited. All rights reserved.
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//
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// This program and the accompanying materials
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// are licensed and made available under the terms and conditions of the BSD License
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// which accompanies this distribution. The full text of the license may be found at
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// http://opensource.org/licenses/bsd-license.php
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//
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// THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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// WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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//
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//
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#include <AsmMacroIoLib.h>
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#include <Base.h>
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#include <Library/PcdLib.h>
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#include <AutoGen.h>
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INCLUDE AsmMacroIoLib.inc
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IMPORT CEntryPoint
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IMPORT ArmReadMpidr
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IMPORT ArmIsMpCore
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EXPORT _ModuleEntryPoint
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PRESERVE8
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AREA PrePiCoreEntryPoint, CODE, READONLY
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StartupAddr DCD CEntryPoint
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_ModuleEntryPoint
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// Get ID of this CPU in Multicore system
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bl ArmReadMpidr
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LoadConstantToReg (FixedPcdGet32(PcdArmPrimaryCoreMask), r1)
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and r5, r0, r1
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_SetSVCMode
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// Enter SVC mode, Disable FIQ and IRQ
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mov r1, #0x13|0x80|0x40
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msr CPSR_c, r1
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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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_SetupStackPosition
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// Compute Top of System Memory
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LoadConstantToReg (FixedPcdGet32(PcdSystemMemoryBase), r1)
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LoadConstantToReg (FixedPcdGet32(PcdSystemMemorySize), r2)
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add r1, r1, r2 // r1 = SystemMemoryTop = PcdSystemMemoryBase + PcdSystemMemorySize
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// Calculate Top of the Firmware Device
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LoadConstantToReg (FixedPcdGet32(PcdFdBaseAddress), r2)
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LoadConstantToReg (FixedPcdGet32(PcdFdSize), r3)
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add r3, r3, r2 // r4 = FdTop = PcdFdBaseAddress + PcdFdSize
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// UEFI Memory Size (stacks are allocated in this region)
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LoadConstantToReg (FixedPcdGet32(PcdSystemMemoryUefiRegionSize), r4)
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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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// 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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// Case the top of stacks is the FdBaseAddress
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mov r1, r2
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_SetupStack
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// r1 contains the top of the stack (and the UEFI Memory)
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// Calculate the Base of the UEFI Memory
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sub r6, r1, r4
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_GetStackBase
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// Compute Base of Normal stacks for CPU Cores
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// Is it MpCore system
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bl ArmIsMpCore
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cmp r0, #0
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// Case it is not an MP Core system. Just setup the primary core
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beq _SetupUnicoreStack
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_GetStackBaseMpCore
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// Stack for the primary core = PrimaryCoreStack
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LoadConstantToReg (FixedPcdGet32(PcdCPUCorePrimaryStackSize), r2)
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sub r7, r1, r2
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// Stack for the secondary core = Number of Cluster * (4 Core per cluster) * SecondaryStackSize
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LoadConstantToReg (FixedPcdGet32(PcdClusterCount), r2)
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lsl r2, r2, #2
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LoadConstantToReg (FixedPcdGet32(PcdCPUCoreSecondaryStackSize), r3)
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mul r2, r2, r3
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sub r7, r7, r2
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// The top of the Mpcore Stacks is in r1
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// The base of the MpCore Stacks is in r7
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// Is it the Primary Core ?
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LoadConstantToReg (FixedPcdGet32(PcdArmPrimaryCore), r4)
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cmp r5, r4
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beq _SetupPrimaryCoreStack
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_SetupSecondaryCoreStack
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// Base of the stack for the secondary cores is in r7
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// Get the position of the cores (ClusterId * 4) + CoreId
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GetCorePositionInStack(r0, r5, r4)
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// The stack starts at the top of the stack region. Add '1' to the Core Position to get the top of the stack
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add r0, r0, #1
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// Get the offset for the Secondary Stack
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mul r0, r0, r3
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add sp, r7, r0
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bne _PrepareArguments
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_SetupPrimaryCoreStack
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// The top of the Mpcore Stacks is in r1
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LoadConstantToReg (FixedPcdGet32(PcdPeiGlobalVariableSize), r2)
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// The reserved space for global variable must be 8-bytes aligned for pushing
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// 64-bit variable on the stack
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SetPrimaryStack (r1, r2, r3)
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_SetGlobals
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// Set all the PrePi global variables to 0
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mov r3, sp
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mov r2, #0x0
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_InitGlobals
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cmp r3, r1
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beq _PrepareArguments
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str r2, [r3], #4
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b _InitGlobals
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_PrepareArguments
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mov r0, r5
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mov r1, r6
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mov r2, r7
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mov r3, sp
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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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// 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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// r3 = GlobalVariableBase
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blx r4
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_NeverReturn
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b _NeverReturn
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_SetupUnicoreStack
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// The top of the Unicore Stack is in r1
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LoadConstantToReg (FixedPcdGet32(PcdPeiGlobalVariableSize), r2)
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LoadConstantToReg (FixedPcdGet32(PcdCPUCorePrimaryStackSize), r3)
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// Calculate the bottom of the primary stack (StackBase)
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sub r7, r1, r3
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// The reserved space for global variable must be 8-bytes aligned for pushing
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// 64-bit variable on the stack
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SetPrimaryStack (r1, r2, r3)
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b _SetGlobals
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END
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