path: root/arch/parisc/kernel/pacache.S

/*
 *  PARISC TLB and cache flushing support
 *  Copyright (C) 2000-2001 Hewlett-Packard (John Marvin)
 *  Copyright (C) 2001 Matthew Wilcox (willy at parisc-linux.org)
 *  Copyright (C) 2002 Richard Hirst (rhirst with parisc-linux.org)
 *
 *    This program is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; either version 2, or (at your option)
 *    any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program; if not, write to the Free Software
 *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

/*
 * NOTE: fdc,fic, and pdc instructions that use base register modification
 *       should only use index and base registers that are not shadowed,
 *       so that the fast path emulation in the non access miss handler
 *       can be used.
 */

#ifdef __LP64__
#define ADDIB	addib,*
#define CMPB	cmpb,*
#define ANDCM	andcm,*

	.level	2.0w
#else
#define ADDIB	addib,
#define CMPB	cmpb,
#define ANDCM	andcm

	.level	2.0
#endif

#include <asm/assembly.h>
#include <asm/psw.h>
#include <asm/pgtable.h>
#include <asm/cache.h>

	.text
	.align	128

	.export flush_tlb_all_local,code

flush_tlb_all_local:
	.proc
	.callinfo NO_CALLS
	.entry

	/*
	 * The pitlbe and pdtlbe instructions should only be used to
	 * flush the entire tlb. Also, there needs to be no intervening
	 * tlb operations, e.g. tlb misses, so the operation needs
	 * to happen in real mode with all interruptions disabled.
	 */

	/*
	 * Once again, we do the rfi dance ... some day we need examine
	 * all of our uses of this type of code and see what can be
	 * consolidated.
	 */

	rsm		PSW_SM_I, %r19		/* relied upon translation! PA 2.0 Arch. F-5 */
	nop
	nop
	nop
	nop
	nop
	nop
	nop
	
	rsm		PSW_SM_Q, %r0		/* Turn off Q bit to load iia queue */
	ldil		L%REAL_MODE_PSW, %r1
	ldo		R%REAL_MODE_PSW(%r1), %r1
	mtctl		%r1, %cr22
	mtctl		%r0, %cr17		/* Clear IIASQ tail */
	mtctl		%r0, %cr17		/* Clear IIASQ head */
	ldil		L%PA(1f), %r1
	ldo		R%PA(1f)(%r1), %r1
	mtctl		%r1, %cr18		/* IIAOQ head */
	ldo		4(%r1), %r1
	mtctl		%r1, %cr18		/* IIAOQ tail */
	rfi