NetBSD-5.0.2/sys/arch/arm/arm/cpufunc_asm_arm3.S

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/*	$NetBSD: cpufunc_asm_arm3.S,v 1.1 2001/11/10 23:14:09 thorpej Exp $	*/

/*
 * Copyright (c) 1997,1998 Mark Brinicombe.
 * Copyright (c) 1997 Causality Limited
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by Causality Limited.
 * 4. The name of Causality Limited may not be used to endorse or promote
 *    products derived from this software without specific prior written
 *    permission.
 *
 * THIS SOFTWARE IS PROVIDED BY CAUSALITY LIMITED ``AS IS'' AND ANY EXPRESS
 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL CAUSALITY LIMITED BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * ARM3 assembly functions for CPU / MMU / TLB specific operations
 */
 
#include <machine/cpu.h>
#include <machine/asm.h>

/*
 * The ARM3 has its own control register in a different place.
 */
ENTRY(arm3_control)
	mrc	p15, 0, r3, c2, c0, 0	/* Read the control register */
	bic	r2, r3, r0		/* Clear bits */
	eor	r2, r2, r1		/* XOR bits */

	teq	r2, r3			/* Only write if there is a change */
	mcrne	p15, 0, r2, c2, c0, 0	/* Write new control register */
	mov	r0, r3			/* Return old value */
	mov	pc, lr

/*
 * Cache functions.
 */

ENTRY(arm3_cache_flush)
	mcr	p15, 0, r0, c1, c0, 0
	mov	pc, lr