1 /* $NetBSD: ioc_fiq_util.S,v 1.1 2002/03/24 15:47:18 bjh21 Exp $ */
4 * Copyright (c) 2001 Ben Harris
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 #include <machine/asm.h>
32 RCSID("$NetBSD: ioc_fiq_util.S,v 1.1 2002/03/24 15:47:18 bjh21 Exp $")
34 #include <machine/memcreg.h>
35 #include <arch/acorn26/iobus/iocreg.h>
38 * fiq_downgrade should be called in FIQ mode. It uses R12_fiq and R13_fiq
39 * as scratch registers. When finished, it returns from the FIQ.
43 ldrb r13, [r12, #(IOC_IRQMSKA << 2)]
44 orr r13, r13, #(1 <<IOC_IRQ_1)
45 strb r13, [r12, #(IOC_IRQMSKA << 2)]
47 strb r13, [r12, #(IOC_FIQMSK << 2)]
48 ldr r12, Lfiq_want_downgrade
53 ENTRY(fiq_downgrade_dont_disable)
55 ldrb r13, [r12, #(IOC_IRQMSKA << 2)]
56 orr r13, r13, #(1 <<IOC_IRQ_1)
57 strb r13, [r12, #(IOC_IRQMSKA << 2)]
58 ldr r12, Lfiq_want_downgrade
67 .word _C_LABEL(fiq_want_downgrade)