mirror of https://github.com/acidanthera/audk.git
75 lines
2.8 KiB
ArmAsm
75 lines
2.8 KiB
ArmAsm
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#------------------------------------------------------------------------------
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#
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# ARM VE Entry point. Reset vector in FV header will brach to
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# _ModuleEntryPoint.
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#
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# We use crazy macros, like LoadConstantToReg, since Xcode assembler
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# does not support = assembly syntax for ldr.
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#
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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 <Library/ArmPlatformLib.h>
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#include <AutoGen.h>
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#Start of Code section
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.text
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.align 3
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GCC_ASM_EXPORT(ArmPlatformIsMemoryInitialized)
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GCC_ASM_EXPORT(ArmPlatformInitializeBootMemory)
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.extern ASM_PFX(InitializeSMC)
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/**
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Called at the early stage of the Boot phase to know if the memory has already been initialized
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Running the code from the reset vector does not mean we start from cold boot. In some case, we
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can go through this code with the memory already initialized.
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Because this function is called at the early stage, the implementation must not use the stack.
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Its implementation must probably done in assembly to ensure this requirement.
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@return Return the condition value into the 'Z' flag
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**/
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ASM_PFX(ArmPlatformIsMemoryInitialized):
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// Check if the memory has been already mapped, if so skipped the memory initialization
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LoadConstantToReg (ARM_VE_SYS_CFGRW1_REG ,r0)
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ldr r0, [r0, #0]
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// 0x40000000 = Value of Physical Configuration Switch SW[0]
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and r0, r0, #0x40000000
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tst r0, #0x40000000
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bx lr
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/**
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Initialize the memory where the initial stacks will reside
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This memory can contain the initial stacks (Secure and Secure Monitor stacks).
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In some platform, this region is already initialized and the implementation of this function can
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do nothing. This memory can also represent the Secure RAM.
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This function is called before the satck has been set up. Its implementation must ensure the stack
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pointer is not used (probably required to use assembly language)
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**/
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ASM_PFX(ArmPlatformInitializeBootMemory):
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mov r5, lr
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// Initialize PL354 SMC
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LoadConstantToReg (ARM_VE_SMC_CTRL_BASE, r1)
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LoadConstantToReg (ARM_VE_SMB_PERIPH_VRAM, r2)
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blx ASM_PFX(InitializeSMC)
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bx r5
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.end
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