/********************************************************************************** Copyright (c) 2006 Xilinx, Inc.  All rights reserved. * * Xilinx, Inc. * XILINX IS PROVIDING THIS DESIGN, CODE, OR INFORMATION "AS IS" AS A * COURTESY TO YOU.  BY PROVIDING THIS DESIGN, CODE, OR INFORMATION AS * ONE POSSIBLE   IMPLEMENTATION OF THIS FEATURE, APPLICATION OR * STANDARD, XILINX IS MAKING NO REPRESENTATION THAT THIS IMPLEMENTATION * IS FREE FROM ANY CLAIMS OF INFRINGEMENT, AND YOU ARE RESPONSIBLE * FOR OBTAINING ANY RIGHTS YOU MAY REQUIRE FOR YOUR IMPLEMENTATION. * XILINX EXPRESSLY DISCLAIMS ANY WARRANTY WHATSOEVER WITH RESPECT TO * THE ADEQUACY OF THE IMPLEMENTATION, INCLUDING BUT NOT LIMITED TO * ANY WARRANTIES OR REPRESENTATIONS THAT THIS IMPLEMENTATION IS FREE * FROM CLAIMS OF INFRINGEMENT, IMPLIED WARRANTIES OF MERCHANTABILITY * AND FITNESS FOR A PARTICULAR PURPOSE. * * File   : microblaze_update_dcache.s* Date   : 2003, September 24* Company: Xilinx* Group  : Emerging Software Technologies** Summary:* Update dcache on the microblaze.* Takes in three parameters*	r5 : Cache Tag Line*	r6 : Cache Data*	r7 : Lock/Valid information*		Bit 30 is Lock  [ 1 indicates locked ]*		Bit 31 is Valid [ 1 indicates valid ]**	--------------------------------------------------------------*	|  Lock	 |     Valid  | Effect*	--------------------------------------------------------------*	|   0    |      0     | Invalidate Cache*       |   0    |      1     | Valid, but unlocked cacheline*       |   1    |      0     | Invalidate Cache, No effect of lock*       |   1    |      1     | Valid cache. Locked to a *       |        |            | particular addrees*	--------------------------------------------------------------** $Id: microblaze_update_dcache.S,v 1.1.2.3 2006/12/08 23:46:24 vasanth Exp $***********************************************************************************/#include "xparameters.h"    #ifndef XPAR_MICROBLAZE_DCACHE_LINE_LEN#define XPAR_MICROBLAZE_DCACHE_LINE_LEN   1#endif	.text	.globl	microblaze_update_dcache	.ent	microblaze_update_dcache	.align	2microblaze_update_dcache:#if XPAR_MICROBLAZE_DCACHE_LINE_LEN == 1/* Read the MSR register into a temp register */	mfs	r18, rmsr/* Clear the dcache enable bit to disable the cache   Register r10,r18 are  volatile registers and hence do not need to be saved before use */	andi	r10, r18, ~128	mts	rmsr, r10/* Update the lock and valid info */	andi	r5, r5, 0xfffffffc	or	r5, r5, r7/* Update dcache */	wdc	r5, r6/* Return */	rtsd	r15, 8	mts	rmsr, r18#else        /* The only valid usage of this routine for larger cache line lengths is to invalidate a data cache line           So call microblaze_init_dcache_range appropriately to do the job   */        brid    microblaze_init_dcache_range        addik   r6, r0, (XPAR_MICROBLAZE_DCACHE_LINE_LEN * 4)        /* We don't have a return instruction here. This is tail call optimization :) */    #endif /* XPAR_MICROBLAZE_DCACHE_LINE_LEN == 1 */	.end	microblaze_update_dcache