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csantifort |
/*----------------------------------------------------------------
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// //
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// start.S //
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// //
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// This file is part of the Amber project //
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// http://www.opencores.org/project,amber //
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// //
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// Description //
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// Assembly routines for hello-world. //
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// As hello-world is a stand-alone application, it needs a //
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// simple start function written in assembly to call the //
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// C code main() function. //
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// //
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// Author(s): //
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// - Conor Santifort, csantifort.amber@gmail.com //
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// //
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//////////////////////////////////////////////////////////////////
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// //
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// Copyright (C) 2010 Authors and OPENCORES.ORG //
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// //
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// This source file may be used and distributed without //
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// restriction provided that this copyright statement is not //
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// removed from the file and that any derivative work contains //
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// the original copyright notice and the associated disclaimer. //
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// //
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// This source file is free software; you can redistribute it //
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// and/or modify it under the terms of the GNU Lesser General //
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// Public License as published by the Free Software Foundation; //
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// either version 2.1 of the License, or (at your option) any //
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// later version. //
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// //
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// This source is distributed in the hope that it will be //
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// useful, but WITHOUT ANY WARRANTY; without even the implied //
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// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR //
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// PURPOSE. See the GNU Lesser General Public License for more //
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// details. //
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// //
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// You should have received a copy of the GNU Lesser General //
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// Public License along with this source; if not, download it //
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// from http://www.opencores.org/lgpl.shtml //
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// //
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----------------------------------------------------------------*/
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.section .text
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.globl start
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_start:
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/* Switch to User Mode */
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/* and unset interrupt mask bits */
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mov r0, #0x00000000
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teqp pc, r0
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@ Enable the cache
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mov r0, #0xffffffff
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mcr 15, 0, r0, cr3, cr0, 0 @ cacheable area
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mov r0, #1
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mcr 15, 0, r0, cr2, cr0, 0 @ cache enable
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@ initialize the stack pointer
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ldr sp, AdrStack
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@ jump to main
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.extern main
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bl main
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b _testpass
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/* stack at top of ddr3 memory space */
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AdrStack: .word 0x8000000
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AdrMalloc: .word 0x7000000
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/* ========================================================================= */
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/* ========================================================================= */
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