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/* $OpenBSD: pci_eb164_intr.s,v 1.2 1997/11/10 15:53:13 niklas Exp $ */
/* $NetBSD: pci_eb164_intr.s,v 1.1 1996/11/25 03:47:07 cgd Exp $ */
/*
* Copyright (c) 1996 Carnegie-Mellon University.
* All rights reserved.
*
* Author: Chris G. Demetriou
*
* Permission to use, copy, modify and distribute this software and
* its documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*/
/*
* The description of how to enable and disable interrupts in the
* AlphaPC 164 motherboard technical reference manual is incorrect,
* at least for the OSF/1 PALcode.
*
* These functions were written by disassembling a Digital UNIX kernel's
* eb164_intrdsabl and eb164_intrenabl functions (because they had
* interesting names), and then playing with them to see how to call
* them correctly.
*
* It looks like the right thing to do is to call them with the interrupt
* request that you want to enable or disable (presumably in the range
* 0 -> 23, since there are 3 8-bit interrupt-enable bits in the
* interrupt mask PLD).
*/
#include <machine/asm.h>
.text
LEAF(eb164_intr_enable,1)
mov a0, a1
ldiq a0, 0x34
call_pal PAL_cserve
RET
END(eb164_intr_enable)
.text
LEAF(eb164_intr_disable,1)
mov a0, a1
ldiq a0, 0x35
call_pal PAL_cserve
RET
END(eb164_intr_enable)
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