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*
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*
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******************************************************************************/
/******************************************************************************
*
*
* 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
*
*
*******************************************************************************/

#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