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Initial revision

/*	$OpenBSD: cachectl.c,v 1.1 2005/08/01 11:54:24 miod Exp $	*/
/*	$NetBSD: sys_machdep.c,v 1.17 1997/05/19 10:15:00 veego Exp $	*/

/*
 * Copyright (c) 1982, 1986, 1993
 *	The Regents of the University of California.  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. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 THE REGENTS OR CONTRIBUTORS 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.
 *
 *	@(#)sys_machdep.c	8.2 (Berkeley) 1/13/94
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/kernel.h>

#include <machine/cpu.h>

#include <uvm/uvm_extern.h>

/*
 * Note that what we do here for a 68040 is different than HP-UX.
 *
 * In HP-UX they either act on a line (len == 16), a page (len == NBPG)
 * or the whole cache (len == anything else).
 *
 * In BSD we attempt to be more optimal when acting on "odd" sizes.
 * For lengths up to 1024 we do all affected lines, up to 2 * NBPG we
 * do pages, above that we do the entire cache.
 */
/*ARGSUSED1*/
int
cachectl(struct proc *p, int req, vaddr_t addr, int len)
{
	int error = 0;

#if defined(M68040) || defined(M68060)
	if (mmutype <= MMU_68040) {
		int inc = 0;
		int doall = 0;
		paddr_t pa = 0;
		vaddr_t end = 0;
#ifdef COMPAT_HPUX
		extern struct emul emul_hpux;

		if ((p->p_emul == &emul_hpux) &&
		    len != 16 && len != NBPG)
			doall = 1;
#endif

		if (addr == 0 ||
		    ((req & ~CC_EXTPURGE) != CC_PURGE && len > 2*NBPG))
			doall = 1;

		if (!doall) {
			end = addr + len;
			if (len <= 1024) {
				addr = addr & ~0xF;
				inc = 16;
			} else {
				addr = addr & ~PGOFSET;
				inc = NBPG;
			}
		}
		do {
			/*
			 * Convert to physical address if needed.
			 * If translation fails, we perform operation on
			 * entire cache (XXX is this a rational thing to do?)
			 */
			if (!doall &&
			    (pa == 0 || ((int)addr & PGOFSET) == 0)) {
				if (pmap_extract(
				    p->p_vmspace->vm_map.pmap,
				    addr, &pa) == FALSE)
					doall = 1;
			}
			switch (req) {
			case CC_EXTPURGE|CC_IPURGE:
			case CC_IPURGE:
				if (doall) {
					DCFA();
					ICPA();
				} else if (inc == 16) {
					DCFL(pa);
					ICPL(pa);
				} else if (inc == NBPG) {
					DCFP(pa);
					ICPP(pa);
				}
				break;

			case CC_EXTPURGE|CC_PURGE:
			case CC_PURGE:
				if (doall)
					DCFA();	/* note: flush not purge */
				else if (inc == 16)
					DCPL(pa);
				else if (inc == NBPG)
					DCPP(pa);
				break;

			case CC_EXTPURGE|CC_FLUSH:
			case CC_FLUSH:
				if (doall)
					DCFA();
				else if (inc == 16)
					DCFL(pa);
				else if (inc == NBPG)
					DCFP(pa);
				break;

			default:
				error = EINVAL;
				break;
			}
			if (doall)
				break;
			pa += inc;
			addr += inc;
		} while (addr < end);
		return (error);
	}
#endif
	switch (req) {
	case CC_EXTPURGE|CC_PURGE:
	case CC_EXTPURGE|CC_FLUSH:
#if defined(CACHE_HAVE_PAC)
		if (ectype == EC_PHYS)
			PCIA();
		/* FALLTHROUGH */
#endif
	case CC_PURGE:
	case CC_FLUSH:
		DCIU();
		break;
	case CC_EXTPURGE|CC_IPURGE:
#if defined(CACHE_HAVE_PAC)
		if (ectype == EC_PHYS)
			PCIA();
		else
#endif
		DCIU();
		/* FALLTHROUGH */
	case CC_IPURGE:
		ICIA();
		break;
	default:
		error = EINVAL;
		break;
	}
	return (error);
}