mirror of https://github.com/acidanthera/audk.git
131 lines
4.0 KiB
ArmAsm
131 lines
4.0 KiB
ArmAsm
//
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// Copyright (c) 2011-2015, 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 <Chipset/ArmV7.h>
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ASM_FUNC(_ModuleEntryPoint)
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// Do early platform specific actions
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bl ASM_PFX(ArmPlatformPeiBootAction)
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// Get ID of this CPU in Multicore system
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bl ASM_PFX(ArmReadMpidr)
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// Keep a copy of the MpId register value
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mov r8, r0
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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 | CPSR_IRQ | CPSR_FIQ)
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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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_SystemMemoryEndInit:
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ADRL (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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_SetupStackPosition:
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// r1 = SystemMemoryTop
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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) - 1)
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add r3, r3, r2 // r3 = FdTop = PcdFdBaseAddress + PcdFdSize
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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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// 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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// 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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_SetupAlignedStack:
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mov r1, r9
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b _GetBaseUefiMemory
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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 & 0xFFFFFFFF)
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and r1, r1, r9
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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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_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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// 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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// 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 ASM_PFX(ArmPlatformStackSet)
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// Is it the Primary Core ?
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mov r0, r8
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bl ASM_PFX(ArmPlatformIsPrimaryCore)
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cmp r0, #1
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bne _PrepareArguments
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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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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, =ASM_PFX(CEntryPoint)
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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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_NeverReturn:
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b _NeverReturn
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