014157862c
* Use a common set of exception handlers for all arm32 platforms. * New FIQ framework based on discussions with Ben Harris, shared between arm26 and arm32.
67 lines
2.4 KiB
ArmAsm
67 lines
2.4 KiB
ArmAsm
/* $NetBSD: ioc_fiq_util.S,v 1.1 2001/12/20 01:20:25 thorpej Exp $ */
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/*-
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* Copyright (c) 2001 Ben Harris
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* All rights reserved.
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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. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <machine/asm.h>
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RCSID("$NetBSD: ioc_fiq_util.S,v 1.1 2001/12/20 01:20:25 thorpej Exp $")
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#include <machine/memcreg.h>
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#include <arch/arm26/iobus/iocreg.h>
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/*
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* fiq_downgrade should be called in FIQ mode. It uses R12_fiq and R13_fiq
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* as scratch registers. When finished, it returns from the FIQ.
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*/
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ENTRY(fiq_downgrade)
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ldr r12, Lioc_base
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ldrb r13, [r12, #(IOC_IRQMSKA << 2)]
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orr r13, r13, #(1 <<IOC_IRQ_1)
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strb r13, [r12, #(IOC_IRQMSKA << 2)]
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mov r13, #0
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strb r13, [r12, #(IOC_FIQMSK << 2)]
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ldr r12, Lfiq_want_downgrade
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mov r13, #1
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str r13, [r12]
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subs pc, r14, #4
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ENTRY(fiq_downgrade_dont_disable)
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ldr r12, Lioc_base
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ldrb r13, [r12, #(IOC_IRQMSKA << 2)]
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orr r13, r13, #(1 <<IOC_IRQ_1)
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strb r13, [r12, #(IOC_IRQMSKA << 2)]
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ldr r12, Lfiq_want_downgrade
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mov r13, #1
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str r13, [r12]
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subs pc, r14, #4
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Lioc_base:
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.word 0x03200000
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Lfiq_want_downgrade:
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.word _C_LABEL(fiq_want_downgrade) |