mirror of https://github.com/acidanthera/audk.git
64 lines
2.3 KiB
NASM
64 lines
2.3 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 <ArmPlatform.h>
|
||
|
|
#include <AutoGen.h>
|
||
|
|
|
||
|
|
INCLUDE AsmMacroIoLib.inc
|
||
|
|
|
||
|
|
EXPORT ArmPlatformIsMemoryInitialized
|
||
|
|
EXPORT ArmPlatformInitializeBootMemory
|
||
|
|
|
||
|
|
PRESERVE8
|
||
|
|
AREA ArmRealViewEbHelper, CODE, READONLY
|
||
|
|
|
||
|
|
/**
|
||
|
|
Called at the early stage of the Boot phase to know if the memory has already been initialized
|
||
|
|
|
||
|
|
Running the code from the reset vector does not mean we start from cold boot. In some case, we
|
||
|
|
can go through this code with the memory already initialized.
|
||
|
|
Because this function is called at the early stage, the implementation must not use the stack.
|
||
|
|
Its implementation must probably done in assembly to ensure this requirement.
|
||
|
|
|
||
|
|
@return Return the condition value into the 'Z' flag
|
||
|
|
|
||
|
|
**/
|
||
|
|
ArmPlatformIsMemoryInitialized
|
||
|
|
// Check if the memory has been already mapped, if so skipped the memory initialization
|
||
|
|
LoadConstantToReg (ARM_EB_SYSCTRL, r0)
|
||
|
|
ldr r0, [r0, #0]
|
||
|
|
|
||
|
|
// 0x200 (BIT9): This read-only bit returns the remap status.
|
||
|
|
and r0, r0, #0x200
|
||
|
|
tst r0, #0x200
|
||
|
|
bx lr
|
||
|
|
|
||
|
|
/**
|
||
|
|
Initialize the memory where the initial stacks will reside
|
||
|
|
|
||
|
|
This memory can contain the initial stacks (Secure and Secure Monitor stacks).
|
||
|
|
In some platform, this region is already initialized and the implementation of this function can
|
||
|
|
do nothing. This memory can also represent the Secure RAM.
|
||
|
|
This function is called before the satck has been set up. Its implementation must ensure the stack
|
||
|
|
pointer is not used (probably required to use assembly language)
|
||
|
|
|
||
|
|
**/
|
||
|
|
ArmPlatformInitializeBootMemory
|
||
|
|
// The SMC does not need to be initialized for RTSM
|
||
|
|
bx lr
|
||
|
|
|
||
|
|
END
|