/******************************************************************************
* Copyright (c) 2008 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. 
*
* microblaze_invalidate_icache_range(unsigned int cacheaddr, unsigned int len)
*    
*    Invalidate an ICache range
*    
*    Parameters:  
*       'cacheaddr' - address in the Icache where invalidation begins
*	'len'       - length (in bytes) worth of Icache to be invalidated
*
* $Id: microblaze_invalidate_icache_range.S,v 1.1.2.1 2009/09/24 23:37:37 haibing Exp $
*
*******************************************************************************/

#include "xparameters.h"

#define MICROBLAZE_MSR_ICACHE_ENABLE        0x00000020
#define MICROBLAZE_MSR_INTR_ENABLE          0x00000002
    
#ifndef XPAR_MICROBLAZE_ICACHE_LINE_LEN
#define XPAR_MICROBLAZE_ICACHE_LINE_LEN   1
#endif

#ifndef XPAR_MICROBLAZE_DCACHE_USE_WRITEBACK
#define MB_VERSION_LT_v720
#endif
    
	.text
	.globl	microblaze_invalidate_icache_range
	.ent	microblaze_invalidate_icache_range
	.align	2

microblaze_invalidate_icache_range:

#ifdef MB_VERSION_LT_v720                                       /* Disable Icache and interrupts before invalidating */    
	mfs	r9, rmsr                                        
	andi	r10, r9, ~(MICROBLAZE_MSR_ICACHE_ENABLE | MICROBLAZE_MSR_INTR_ENABLE)
	mts	rmsr, r10
#endif

        beqi    r6, L_done                                      /* Skip loop if size is zero */
    
        add	r6, r5, r6                                      /* Compute end address */
        addik   r6, r6, -1
    
        andi    r6, r6, -(4 * XPAR_MICROBLAZE_ICACHE_LINE_LEN)  /* Align end down to cache line */   
        andi    r5, r5, -(4 * XPAR_MICROBLAZE_ICACHE_LINE_LEN)  /* Align start down to cache line */

L_start:
    	cmpu	r18, r5, r6                                     /* Are we at the end? */
	blti	r18, L_done                                     

	wic	r5, r0                                          /* Invalidate the cache line */
        
     	brid	L_start                                         /* Branch to the beginning of the loop */
	addik	r5, r5, (XPAR_MICROBLAZE_ICACHE_LINE_LEN * 4)   /* Increment the addrees by 4 (delay slot) */

L_done:
	rtsd	r15, 8                                          /* Return */
#ifdef MB_VERSION_LT_v720                                       /* restore MSR only for MB version < v7.20 */
	mts	rmsr, r9
#else
        nop
#endif
	.end	microblaze_invalidate_icache_range