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[/] [amber/] [trunk/] [sw/] [hello-world/] [start.S] - Rev 66
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/*----------------------------------------------------------------
// //
// start.S //
// //
// This file is part of the Amber project //
// http://www.opencores.org/project,amber //
// //
// Description //
// Assembly routines for hello-world. //
// As hello-world is a stand-alone application, it needs a //
// simple start function written in assembly to call the //
// C code main() function. //
// //
// Author(s): //
// - Conor Santifort, csantifort.amber@gmail.com //
// //
//////////////////////////////////////////////////////////////////
// //
// Copyright (C) 2010 Authors and OPENCORES.ORG //
// //
// This source file may be used and distributed without //
// restriction provided that this copyright statement is not //
// removed from the file and that any derivative work contains //
// the original copyright notice and the associated disclaimer. //
// //
// This source file is free software; you can redistribute it //
// and/or modify it under the terms of the GNU Lesser General //
// Public License as published by the Free Software Foundation; //
// either version 2.1 of the License, or (at your option) any //
// later version. //
// //
// This source is distributed in the hope that it will be //
// useful, but WITHOUT ANY WARRANTY; without even the implied //
// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR //
// PURPOSE. See the GNU Lesser General Public License for more //
// details. //
// //
// You should have received a copy of the GNU Lesser General //
// Public License along with this source; if not, download it //
// from http://www.opencores.org/lgpl.shtml //
// //
----------------------------------------------------------------*/
.section .text
.globl start
_start:
/* Switch to User Mode */
/* and unset interrupt mask bits */
mov r0, #0x00000000
teqp pc, r0
@ Enable the cache
mov r0, #0xffffffff
mcr 15, 0, r0, cr3, cr0, 0 @ cacheable area
mov r0, #1
mcr 15, 0, r0, cr2, cr0, 0 @ cache enable
@ initialize the stack pointer
ldr sp, AdrStack
@ jump to main
.extern main
bl main
b _testpass
/* stack at top of ddr3 memory space */
AdrStack: .word 0x8000000
.section .bss
.word 0x0
/* ========================================================================= */
/* ========================================================================= */
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