1/*	$OpenBSD: pci_eb164_intr.s,v 1.3 2002/08/15 17:01:38 deraadt Exp $	*/
2/*	$NetBSD: pci_eb164_intr.s,v 1.1 1996/11/25 03:47:07 cgd Exp $	*/
3
4/*
5 * Copyright (c) 1996 Carnegie-Mellon University.
6 * All rights reserved.
7 *
8 * Author: Chris G. Demetriou
9 *
10 * Permission to use, copy, modify and distribute this software and
11 * its documentation is hereby granted, provided that both the copyright
12 * notice and this permission notice appear in all copies of the
13 * software, derivative works or modified versions, and any portions
14 * thereof, and that both notices appear in supporting documentation.
15 *
16 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
17 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
18 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
19 *
20 * Carnegie Mellon requests users of this software to return to
21 *
22 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
23 *  School of Computer Science
24 *  Carnegie Mellon University
25 *  Pittsburgh PA 15213-3890
26 *
27 * any improvements or extensions that they make and grant Carnegie the
28 * rights to redistribute these changes.
29 */
30
31/*
32 * The description of how to enable and disable interrupts in the
33 * AlphaPC 164 motherboard technical reference manual is incorrect,
34 * at least for the OSF/1 PALcode.
35 *
36 * These functions were written by disassembling a Digital UNIX kernel's
37 * eb164_intrdsabl and eb164_intrenabl functions (because they had
38 * interesting names), and then playing with them to see how to call
39 * them correctly.
40 *
41 * It looks like the right thing to do is to call them with the interrupt
42 * request that you want to enable or disable (presumably in the range
43 * 0 -> 23, since there are 3 8-bit interrupt-enable bits in the
44 * interrupt mask PLD).
45 */
46
47#include <machine/asm.h>
48
49	.text
50LEAF(eb164_intr_enable,1)
51	mov	a0, a1
52	ldiq	a0, 0x34
53	call_pal PAL_cserve
54	RET
55	END(eb164_intr_enable)
56
57	.text
58LEAF(eb164_intr_disable,1)
59	mov	a0, a1
60	ldiq	a0, 0x35
61	call_pal PAL_cserve
62	RET
63	END(eb164_intr_disable)
64