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      1 /*	$NetBSD: cpufunc_asm_ixp12x0.S,v 1.4 2014/03/30 01:15:03 matt Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2002 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 #include <arm/asm.h>
     39 #include <arm/locore.h>
     40 
     41 /*
     42  * This function is the same as sa110_context_switch for now, the plan
     43  * is to make use of the process id register to avoid cache flushes.
     44  */
     45 ENTRY(ixp12x0_context_switch)
     46 	/*
     47 	 * CF_CACHE_PURGE_ID will *ALWAYS* be called prior to this.
     48 	 * Thus the data cache will contain only kernel data and the
     49 	 * instruction cache will contain only kernel code, and all
     50 	 * kernel mappings are shared by all processes.
     51 	 */
     52 
     53 	/* Write the TTB */
     54 	mcr	p15, 0, r0, c2, c0, 0
     55 
     56 	/* If we have updated the TTB we must flush the TLB */
     57 	mcr	p15, 0, r0, c8, c7, 0	/* flush the I+D tlb */
     58 
     59 	/* Make sure that pipeline is emptied */
     60 	mov	r0, r0
     61 	mov	r0, r0
     62 	mov	pc, lr
     63 END(ixp12x0_context_switch)
     64 
     65 ENTRY(ixp12x0_drain_readbuf)
     66 	mcr	p15, 0, r0, c9, c0, 0		/* drain read buffer */
     67 	mov	pc, lr
     68 END(ixp12x0_drain_readbuf)
     69 
     70 /*
     71  * Information for the IXP12X0 cache clean/purge functions:
     72  *
     73  *      * Virtual address of the memory region to use
     74  *      * Size of memory region
     75  */
     76 	.data
     77 
     78 	.global _C_LABEL(ixp12x0_cache_clean_addr)
     79 _C_LABEL(ixp12x0_cache_clean_addr):
     80         .word   0xf0000000
     81 
     82 	.global _C_LABEL(ixp12x0_cache_clean_size)
     83 _C_LABEL(ixp12x0_cache_clean_size):
     84 	.word   0x00008000
     85 
     86 	.text
     87 
     88 .Lixp12x0_cache_clean_addr:
     89 	.word   _C_LABEL(ixp12x0_cache_clean_addr)
     90 .Lixp12x0_cache_clean_size:
     91 	.word   _C_LABEL(ixp12x0_cache_clean_size)
     92