102 lines
3.0 KiB
ArmAsm
102 lines
3.0 KiB
ArmAsm
/* $NetBSD: fiq_subr.S,v 1.3 2002/04/12 18:50:31 thorpej Exp $ */
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/*-
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* Copyright (c) 2001 Wasabi Systems, Inc.
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* All rights reserved.
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*
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* Written by Jason R. Thorpe for Wasabi Systems, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed for the NetBSD Project by
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* Wasabi Systems, Inc.
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* 4. The name of Wasabi Systems, Inc. may not be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include <machine/armreg.h>
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#include <machine/asm.h>
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__FBSDID("$FreeBSD$");
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/*
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* MODE_CHANGE_NOP should be inserted between a mode change and a
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* banked register (R8--R15) access.
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*/
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#if defined(CPU_ARM2) || defined(CPU_ARM250)
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#define MODE_CHANGE_NOP mov r0, r0
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#else
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#define MODE_CHANGE_NOP /* Data sheet says ARM3 doesn't need it */
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#endif
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#define SWITCH_TO_FIQ_MODE \
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mrs r2, cpsr_all ; \
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mov r3, r2 ; \
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bic r2, r2, #(PSR_MODE) ; \
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orr r2, r2, #(PSR_FIQ32_MODE) ; \
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msr cpsr_all, r2
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#define BACK_TO_SVC_MODE \
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msr cpsr_all, r3
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/*
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* fiq_getregs:
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*
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* Fetch the FIQ mode banked registers into the fiqhandler
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* structure.
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*/
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ENTRY(fiq_getregs)
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SWITCH_TO_FIQ_MODE
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stmia r0, {r8-r13}
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BACK_TO_SVC_MODE
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RET
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/*
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* fiq_setregs:
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*
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* Load the FIQ mode banked registers from the fiqhandler
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* structure.
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*/
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ENTRY(fiq_setregs)
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SWITCH_TO_FIQ_MODE
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ldmia r0, {r8-r13}
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BACK_TO_SVC_MODE
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RET
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/*
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* fiq_nullhandler:
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*
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* Null handler copied down to the FIQ vector when the last
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* FIQ handler is removed.
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*/
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.global _C_LABEL(fiq_nullhandler), _C_LABEL(fiq_nullhandler_end)
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_C_LABEL(fiq_nullhandler):
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subs pc, lr, #4
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_C_LABEL(fiq_nullhandler_end):
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