mirror of https://github.com/acidanthera/audk.git
54 lines
1.7 KiB
NASM
54 lines
1.7 KiB
NASM
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//------------------------------------------------------------------------------
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//
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// Copyright (c) 2008-2009 Apple Inc. All rights reserved.
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//
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// All rights reserved. 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 <Library/PcdLib.h>
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#include <AutoGen.h>
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INCLUDE AsmMacroIoLib.inc
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IMPORT CEntryPoint
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EXPORT _ModuleEntryPoint
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PRESERVE8
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AREA ModuleEntryPoint, CODE, READONLY
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_ModuleEntryPoint
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//
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// Set stack based on PCD values. Need to do it this way to make C code work
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// when it runs from FLASH.
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//
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LoadConstantToReg (FixedPcdGet32(PcdPrePiStackBase) ,r2) /* stack base arg2 */
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LoadConstantToReg (FixedPcdGet32(PcdPrePiStackSize) ,r3) /* stack size arg3 */
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add r4, r2, r3
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//Enter SVC mode and set up SVC stack pointer
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mov r0,#0x13|0x80|0x40
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msr CPSR_c,r0
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mov r13,r4
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// Call C entry point
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LoadConstantToReg (FixedPcdGet32(PcdMemorySize) ,r1) /* memory size arg1 */
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LoadConstantToReg (FixedPcdGet32(PcdMemoryBase) ,r0) /* memory size arg0 */
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blx CEntryPoint /* Assume C code is thumb */
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ShouldNeverGetHere
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/* _CEntryPoint should never return */
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b ShouldNeverGetHere
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END
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