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      1 /*	$NetBSD: ip22_cache.S,v 1.5 2005/12/11 12:18:58 christos Exp $	*/
      2 
      3 /*
      4  * Copyright 2001 Wasabi Systems, Inc.
      5  * All rights reserved.
      6  *
      7  * Written by Jason R. Thorpe for Wasabi Systems, Inc.
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  * 3. All advertising materials mentioning features or use of this software
     18  *    must display the following acknowledgement:
     19  *	This product includes software developed for the NetBSD Project by
     20  *	Wasabi Systems, Inc.
     21  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
     22  *    or promote products derived from this software without specific prior
     23  *    written permission.
     24  *
     25  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
     26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     27  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     28  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
     29  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     30  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     31  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     32  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     33  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     34  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     35  * POSSIBILITY OF SUCH DAMAGE.
     36  */
     37 
     38 /*
     39  * Code to manipulate the L2 SysAD cache on R4600-based SGI IP22/24 systems.
     40  */
     41 
     42 #include <mips/asm.h>
     43 #include <mips/cpuregs.h>
     44 
     45 	.set	noreorder
     46 	.set	mips3
     47 
     48 #define	PROLOGUE							\
     49 	mfc0	t0, MIPS_COP_0_STATUS				;	\
     50 	nop							;	\
     51 	nop							;	\
     52 	nop							;	\
     53 	li	v0, ~MIPS_SR_INT_IE	/* ints off */		;	\
     54 	and	t1, v0, t0					;	\
     55 	or	t1, MIPS3_SR_KX		/* enable 64-bit */	;	\
     56 	mtc0	t1, MIPS_COP_0_STATUS				;	\
     57 	nop							;	\
     58 	nop							;	\
     59 	nop							;	\
     60 	nop
     61 
     62 #define	EPILOGUE							\
     63 	mtc0	t0, MIPS_COP_0_STATUS				;	\
     64 	nop							;	\
     65 	nop							;	\
     66 	nop							;	\
     67 	nop
     68 
     69 /*
     70  * ip22_sdcache_do_wbinv:
     71  *
     72  *	Write-back and invalidate the cache lines [a0..a1].
     73  */
     74 LEAF_NOPROFILE(ip22_sdcache_do_wbinv)
     75 	PROLOGUE
     76 
     77 	/*
     78 	 * Translate the cache indices into the magic cache
     79 	 * flush space.
     80 	 */
     81 	dli	v0, 0x9000000080000000	/* base of cache flush space */
     82 	or	a0, v0			/* first */
     83 	or	a1, v0			/* last */
     84 
     85 	/*
     86 	 * Flush the cache by performing a store into the
     87 	 * magic cache flush space.
     88 	 */
     89 1:	sw	zero, 0(a0)
     90 	bne	a0, a1, 1b
     91 	daddu	a0, 32
     92 
     93 	EPILOGUE
     94 
     95 	j	ra
     96 	nop
     97 END(ip22_sdcache_do_wbinv)
     98 
     99 LEAF_NOPROFILE(ip22_sdcache_enable)
    100 	PROLOGUE
    101 
    102 	li	a0, 0x1
    103 	dsll	a0, 31
    104 	lui	a1, 0x9000
    105 	dsll32	a1, 0
    106 	or	a0, a1, a0
    107 	sb	zero, 0(a0)
    108 
    109 	EPILOGUE
    110 
    111 	j	ra
    112 	nop
    113 END(ip22_sdcache_enable)
    114 
    115 LEAF_NOPROFILE(ip22_sdcache_disable)
    116 	PROLOGUE
    117 
    118 	li	a0, 0x1
    119 	dsll	a0, 31
    120 	lui	a1, 0x9000
    121 	dsll32	a1, 0
    122 	or	a0, a1, a0
    123 	sh	zero, 0(a0)
    124 
    125 	EPILOGUE
    126 
    127 	j	ra
    128 	nop
    129 END(ip22_sdcache_disable)
    130