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******************************************************************************/
/******************************************************************************
*
* microblaze_invalidate_dcache()
*
*    Invalidate the entire L1 DCache
*
*
*******************************************************************************/

#include "xparameters.h"

#define MICROBLAZE_MSR_DCACHE_ENABLE        0x00000080
#define MICROBLAZE_MSR_INTR_ENABLE          0x00000002

#ifndef XPAR_MICROBLAZE_DCACHE_LINE_LEN
#define XPAR_MICROBLAZE_DCACHE_LINE_LEN   1
#endif

#ifndef XPAR_MICROBLAZE_DCACHE_USE_WRITEBACK
#define MB_VERSION_LT_v720
#endif

	.text
	.globl	microblaze_invalidate_dcache
	.ent	microblaze_invalidate_dcache
	.align	2

microblaze_invalidate_dcache:

#ifdef MB_VERSION_LT_v720                                       /* Disable Dcache and interrupts before invalidating */
	mfs	r9, rmsr
	andi	r10, r9, ~(MICROBLAZE_MSR_DCACHE_ENABLE | MICROBLAZE_MSR_INTR_ENABLE)
	mts	rmsr, r10
#endif
	addik 	r5, r0, XPAR_MICROBLAZE_DCACHE_BASEADDR & (-(4 * XPAR_MICROBLAZE_DCACHE_LINE_LEN))
	addik	r6, r5, XPAR_MICROBLAZE_DCACHE_BYTE_SIZE &  (-(4 * XPAR_MICROBLAZE_DCACHE_LINE_LEN))        /* Compute end */

L_start:
	wdc	r5, r0                                          /* Invalidate the Cache */

	cmpu	r18, r5, r6                                     /* Are we at the end? */
	blei	r18, L_done

	brid	L_start                                         /* Branch to the beginning of the loop */
	addik	r5, r5, (XPAR_MICROBLAZE_DCACHE_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_dcache