mirror of https://github.com/acidanthera/audk.git
103 lines
3.4 KiB
ArmAsm
Executable File
103 lines
3.4 KiB
ArmAsm
Executable File
//
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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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.text
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.align 3
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# Global symbols referenced by this module
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GCC_ASM_IMPORT(CEntryPoint)
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GCC_ASM_IMPORT(ArmReadMpidr)
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GCC_ASM_EXPORT(_ModuleEntryPoint)
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StartupAddr: .word CEntryPoint
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ASM_PFX(_ModuleEntryPoint):
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// Get ID of this CPU in Multicore system
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bl ASM_PFX(ArmReadMpidr)
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LoadConstantToReg (FixedPcdGet32(PcdArmPrimaryCoreMask), r1)
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and r0, r0, r1
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_SetSVCMode:
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// Enter SVC mode
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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 size 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(PcdNormalFdBaseAddress), r2)
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LoadConstantToReg (FixedPcdGet32(PcdNormalFdSize), r3)
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add r3, r3, r2 // r4 = FdTop = PcdNormalFdBaseAddress + PcdNormalFdSize
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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 r5, r1, r3 // r5 = SystemMemoryTop - FdTop
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bmi _SetupStack // Jump if negative (FdTop > SystemMemoryTop)
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cmp r5, 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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// Compute Base of Normal stacks for CPU Cores
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LoadConstantToReg (FixedPcdGet32(PcdCPUCoresNonSecStackSize), r5)
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mul r3, r0, r5 // r3 = core_id * stack_size = offset from the stack base
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sub sp, r1, r3 // r3 = (SystemMemoryTop|FdBaseAddress) - StackOffset = TopOfStack
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// Calculate the Base of the UEFI Memory
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sub r1, r1, r4
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// Only allocate memory for global variables at top of the primary core stack
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cmp r0, #0
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bne _PrepareArguments
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_AllocateGlobalPrePiVariables:
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// Reserve top of the stack for Global PEI Variables (eg: PeiServicesTablePointer)
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LoadConstantToReg (FixedPcdGet32(PcdPeiGlobalVariableSize), r4)
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// The reserved place must be 8-bytes aligned for pushing 64-bit variable on the stack
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and r5, r4, #7
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rsb r5, r5, #8
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add r4, r4, r5
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sub sp, sp, r4
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_PrepareArguments:
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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 r2, 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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blx r2
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