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