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/* $NetBSD: fiq_subr.S,v 1.3 2002/04/12 18:50:31 thorpej Exp $ */
/*-
* Copyright (c) 2001 Wasabi Systems, Inc.
* All rights reserved.
*
* Written by Jason R. Thorpe for Wasabi Systems, Inc.
*
* 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 for the NetBSD Project by
* Wasabi Systems, Inc.
* 4. The name of Wasabi Systems, Inc. may not be used to endorse
* or promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``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 WASABI SYSTEMS, INC
* 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.
*
*/
#include <machine/asm.h>
__FBSDID("$FreeBSD$");
#include <machine/armreg.h>
/*
* MODE_CHANGE_NOP should be inserted between a mode change and a
* banked register (R8--R15) access.
*/
#if defined(CPU_ARM2) || defined(CPU_ARM250)
#define MODE_CHANGE_NOP mov r0, r0
#else
#define MODE_CHANGE_NOP /* Data sheet says ARM3 doesn't need it */
#endif
#define SWITCH_TO_FIQ_MODE \
mrs r2, cpsr ; \
mov r3, r2 ; \
bic r2, r2, #(PSR_MODE) ; \
orr r2, r2, #(PSR_FIQ32_MODE) ; \
msr cpsr_fsxc, r2
#define BACK_TO_SVC_MODE \
msr cpsr_fsxc, r3
/*
* fiq_getregs:
*
* Fetch the FIQ mode banked registers into the fiqhandler
* structure.
*/
ENTRY(fiq_getregs)
SWITCH_TO_FIQ_MODE
stmia r0, {r8-r13}
BACK_TO_SVC_MODE
RET
END(fiq_getregs)
/*
* fiq_setregs:
*
* Load the FIQ mode banked registers from the fiqhandler
* structure.
*/
ENTRY(fiq_setregs)
SWITCH_TO_FIQ_MODE
ldmia r0, {r8-r13}
BACK_TO_SVC_MODE
RET
END(fiq_setregs)
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