@  ____________________________________________________________________
@ 
@  Copyright (c) 2002, Andrew N. Sloss, Chris Wright and Dominic Symes
@  All rights reserved.
@  ____________________________________________________________________
@ 
@  NON-COMMERCIAL USE License
@  
@  Redistribution and use in source and binary forms, with or without 
@  modification, are permitted provided that the following conditions 
@  are met: 
@  
@  1. For NON-COMMERCIAL USE only.
@ 
@  2. Redistributions of source code must retain the above copyright 
@     notice, this list of conditions and the following disclaimer. 
@ 
@  3. Redistributions in binary form must reproduce the above 
@     copyright notice, this list of conditions and the following 
@     disclaimer in the documentation and/or other materials provided 
@     with the distribution. 
@ 
@  4. All advertising materials mentioning features or use of this 
@     software must display the following acknowledgement:
@ 
@     This product includes software developed by Andrew N. Sloss,
@     Chris Wright and Dominic Symes. 
@ 
@   THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS ``AS IS'' AND ANY 
@   EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
@   IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 
@   PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE CONTRIBUTORS BE 
@   LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 
@   OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 
@   PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES@ LOSS OF USE, DATA, 
@   OR PROFITS@ OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 
@   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR 
@   TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 
@   OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 
@   OF SUCH DAMAGE. 
@ 
@  If you have questions about this license or would like a different
@  license please email :
@ 
@ 	andrew@sloss.net
@ 
@ 
@ ****************************************************************************
@ * Simple Little Operating System - mpuSLOS
@ ****************************************************************************


@ ****************************************************************************
@ *
@ * Module      : async 
@ * Description : switch on system (enable cache and asynchronous mode).
@ * History     :
@ *
@ * 8th July 2002 Andrew N. Sloss
@ * - ported from Chris Wright's example code. 
@ * 
@ ****************************************************************************

	.extern jumpToTask1
	.extern mpuChangeControl

	.global switchOnSystem


@ ; -------------------------------------------------------------------
@ ; switchOnSystem :
@ ;      enables I & D cache, and Write back
@ ;      special to the 940 set the bus to asynchronous clocking
@ ; -------------------------------------------------------------------
 
switchOnSystem:

@ ;infinite
@ ;    B infinite

@ ; enable: Icache,WB,Dcache,MPU

     LDR     r0,=0x100d
     LDR     r1,=0x100d
     BL      mpuChangeControl
 
@ ; asynchronous clocking, 940t only

     LDR     r0,=0xc0000000
     LDR     r1,=0xc0000000
     BL      mpuChangeControl

@ ; -------------------------------------------------------------------
@ ; Jump to Task 1 and switch to User mode and enable IRQ interrupts
@ ; -------------------------------------------------------------------

     MOV     r0,#0x20000
     B       jumpToTask1
     .end