mirror of https://github.com/acidanthera/audk.git
102 lines
3.3 KiB
NASM
102 lines
3.3 KiB
NASM
//
|
|
// Copyright (c) 2011, 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 <AsmMacroIoLib.h>
|
|
#include <Base.h>
|
|
#include <Library/PcdLib.h>
|
|
#include <AutoGen.h>
|
|
|
|
INCLUDE AsmMacroIoLib.inc
|
|
|
|
IMPORT CEntryPoint
|
|
EXPORT _ModuleEntryPoint
|
|
|
|
PRESERVE8
|
|
AREA PrePiCoreEntryPoint, CODE, READONLY
|
|
|
|
StartupAddr DCD CEntryPoint
|
|
|
|
_ModuleEntryPoint
|
|
// Identify CPU ID
|
|
mrc p15, 0, r0, c0, c0, 5
|
|
and r0, #0xf
|
|
|
|
_SetSVCMode
|
|
// Enter SVC mode
|
|
mov r1, #0x13|0x80|0x40
|
|
msr CPSR_c, r1
|
|
|
|
// Check if we can install the size 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), r1)
|
|
LoadConstantToReg (FixedPcdGet32(PcdSystemMemorySize), r2)
|
|
add r1, r1, r2 // r1 = SystemMemoryTop = PcdSystemMemoryBase + PcdSystemMemorySize
|
|
|
|
// Calculate Top of the Firmware Device
|
|
LoadConstantToReg (FixedPcdGet32(PcdNormalFdBaseAddress), r2)
|
|
LoadConstantToReg (FixedPcdGet32(PcdNormalFdSize), r3)
|
|
add r3, r3, r2 // r4 = FdTop = PcdNormalFdBaseAddress + PcdNormalFdSize
|
|
|
|
// UEFI Memory Size (stacks are allocated in this region)
|
|
LoadConstantToReg (FixedPcdGet32(PcdSystemMemoryUefiRegionSize), r4)
|
|
|
|
//
|
|
// 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 r5, r1, r3 // r5 = SystemMemoryTop - FdTop
|
|
bmi _SetupStack // Jump if negative (FdTop > SystemMemoryTop)
|
|
cmp r5, r4
|
|
bge _SetupStack
|
|
|
|
// Case the top of stacks is the FdBaseAddress
|
|
mov r1, r2
|
|
|
|
_SetupStack
|
|
// Compute Base of Normal stacks for CPU Cores
|
|
LoadConstantToReg (FixedPcdGet32(PcdCPUCoresNonSecStackSize), r5)
|
|
mul r3, r0, r5 // r3 = core_id * stack_size = offset from the stack base
|
|
sub sp, r1, r3 // r3 = (SystemMemoryTop|FdBaseAddress) - StackOffset = TopOfStack
|
|
|
|
// Calculate the Base of the UEFI Memory
|
|
sub r1, r1, r4
|
|
|
|
// Only allocate memory for global variables at top of the primary core stack
|
|
cmp r0, #0
|
|
bne _PrepareArguments
|
|
|
|
_AllocateGlobalPrePiVariables
|
|
// Reserve top of the stack for Global PEI Variables (eg: PeiServicesTablePointer)
|
|
LoadConstantToReg (FixedPcdGet32(PcdPeiGlobalVariableSize), r4)
|
|
// The reserved place must be 8-bytes aligned for pushing 64-bit variable on the stack
|
|
and r5, r4, #7
|
|
rsb r5, r5, #8
|
|
add r4, r4, r5
|
|
sub sp, sp, r4
|
|
|
|
_PrepareArguments
|
|
// Move sec startup address into a data register
|
|
// Ensure we're jumping to FV version of the code (not boot remapped alias)
|
|
ldr r2, StartupAddr
|
|
|
|
// Jump to PrePiCore C code
|
|
// r0 = core_id
|
|
// r1 = UefiMemoryBase
|
|
blx r2
|
|
|
|
END
|