mirror of https://github.com/acidanthera/audk.git
147 lines
4.7 KiB
ArmAsm
147 lines
4.7 KiB
ArmAsm
//
|
|
// Copyright (c) 2011-2013, 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 <AsmMacroIoLibV8.h>
|
|
#include <Base.h>
|
|
#include <Library/PcdLib.h>
|
|
#include <AutoGen.h>
|
|
|
|
.text
|
|
.align 3
|
|
|
|
GCC_ASM_IMPORT(ArmPlatformIsPrimaryCore)
|
|
GCC_ASM_IMPORT(ArmReadMpidr)
|
|
GCC_ASM_IMPORT(ArmPlatformPeiBootAction)
|
|
GCC_ASM_IMPORT(ArmPlatformStackSet)
|
|
GCC_ASM_EXPORT(_ModuleEntryPoint)
|
|
|
|
StartupAddr: .dword ASM_PFX(CEntryPoint)
|
|
|
|
ASM_PFX(_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 x10, x0
|
|
|
|
_SetSVCMode:
|
|
// 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)
|
|
_SetupStackPosition:
|
|
// Compute Top of System Memory
|
|
LoadConstantToReg (FixedPcdGet32(PcdSystemMemoryBase), x1)
|
|
LoadConstantToReg (FixedPcdGet32(PcdSystemMemorySize), x2)
|
|
sub x2, x2, #1
|
|
add x1, x1, x2 // x1 = SystemMemoryTop = PcdSystemMemoryBase + PcdSystemMemorySize
|
|
|
|
// Calculate Top of the Firmware Device
|
|
LoadConstantToReg (FixedPcdGet32(PcdFdBaseAddress), x2)
|
|
LoadConstantToReg (FixedPcdGet32(PcdFdSize), x3)
|
|
sub x3, x3, #1
|
|
add x3, x3, x2 // x3 = FdTop = PcdFdBaseAddress + PcdFdSize
|
|
|
|
// UEFI Memory Size (stacks are allocated in this region)
|
|
LoadConstantToReg (FixedPcdGet32(PcdSystemMemoryUefiRegionSize), x4)
|
|
|
|
//
|
|
// 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 x0, x1, x3 // x0 = SystemMemoryTop - FdTop
|
|
b.mi _SetupStack // Jump if negative (FdTop > SystemMemoryTop). Case when the PrePi is in XIP memory outside of the DRAM
|
|
cmp x0, x4
|
|
b.ge _SetupStack
|
|
|
|
// Case the top of stacks is the FdBaseAddress
|
|
mov x1, x2
|
|
|
|
_SetupStack:
|
|
// x1 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 x11, x1, #1
|
|
b.cs _SetupOverflowStack
|
|
|
|
_SetupAlignedStack:
|
|
mov x1, x11
|
|
b _GetBaseUefiMemory
|
|
|
|
_SetupOverflowStack:
|
|
// Case memory at the top of the address space. Ensure the top of the stack is EFI_PAGE_SIZE
|
|
// aligned (4KB)
|
|
LoadConstantToReg (EFI_PAGE_MASK, x11)
|
|
and x11, x11, x1
|
|
sub x1, x1, x11
|
|
|
|
_GetBaseUefiMemory:
|
|
// Calculate the Base of the UEFI Memory
|
|
sub x11, x1, x4
|
|
|
|
_GetStackBase:
|
|
// r1 = The top of the Mpcore Stacks
|
|
// Stack for the primary core = PrimaryCoreStack
|
|
LoadConstantToReg (FixedPcdGet32(PcdCPUCorePrimaryStackSize), x2)
|
|
sub x12, x1, x2
|
|
|
|
// Stack for the secondary core = Number of Cores - 1
|
|
LoadConstantToReg (FixedPcdGet32(PcdCoreCount), x0)
|
|
sub x0, x0, #1
|
|
LoadConstantToReg (FixedPcdGet32(PcdCPUCoreSecondaryStackSize), x1)
|
|
mul x1, x1, x0
|
|
sub x12, x12, x1
|
|
|
|
// x12 = The base of the MpCore Stacks (primary stack & secondary stacks)
|
|
mov x0, x12
|
|
mov x1, x10
|
|
//ArmPlatformStackSet(StackBase, MpId, PrimaryStackSize, SecondaryStackSize)
|
|
LoadConstantToReg (FixedPcdGet32(PcdCPUCorePrimaryStackSize), x2)
|
|
LoadConstantToReg (FixedPcdGet32(PcdCPUCoreSecondaryStackSize), x3)
|
|
bl ASM_PFX(ArmPlatformStackSet)
|
|
|
|
// Is it the Primary Core ?
|
|
mov x0, x10
|
|
bl ASM_PFX(ArmPlatformIsPrimaryCore)
|
|
cmp x0, #1
|
|
bne _PrepareArguments
|
|
|
|
_ReserveGlobalVariable:
|
|
LoadConstantToReg (FixedPcdGet32(PcdPeiGlobalVariableSize), x0)
|
|
// InitializePrimaryStack($GlobalVariableSize, $Tmp1, $Tmp2)
|
|
InitializePrimaryStack(x0, x1, x2)
|
|
|
|
_PrepareArguments:
|
|
mov x0, x10
|
|
mov x1, x11
|
|
mov x2, x12
|
|
mov x3, sp
|
|
|
|
// Move sec startup address into a data register
|
|
// Ensure we're jumping to FV version of the code (not boot remapped alias)
|
|
ldr x4, StartupAddr
|
|
|
|
// Jump to PrePiCore C code
|
|
// x0 = MpId
|
|
// x1 = UefiMemoryBase
|
|
// x2 = StacksBase
|
|
// x3 = GlobalVariableBase
|
|
blr x4
|
|
|
|
_NeverReturn:
|
|
b _NeverReturn
|