b741a1c581
tweak to enable/disable interrupt sources. Seems to work. It is unclear how many of the PC164 models actually might needs this, and whether or not there are other hidden issues. Obtained from:Bernd Walter <ticso@cicely8.cicely.de>
96 lines
2.7 KiB
ArmAsm
96 lines
2.7 KiB
ArmAsm
/* $FreeBSD$ */
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/* $NetBSD: pci_eb164_intr.s,v 1.5 1997/09/02 13:19:42 thorpej Exp $ */
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/*
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* Copyright (c) 1996 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Author: Chris G. Demetriou
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*
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* Permission to use, copy, modify and distribute this software and
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* its documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
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* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*/
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/*
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* The description of how to enable and disable interrupts in the
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* AlphaPC 164 motherboard technical reference manual is incorrect,
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* at least for the OSF/1 PALcode.
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*
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* These functions were written by disassembling a Digital UNIX kernel's
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* eb164_intrdsabl and eb164_intrenabl functions (because they had
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* interesting names), and then playing with them to see how to call
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* them correctly.
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*
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* It looks like the right thing to do is to call them with the interrupt
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* request that you want to enable or disable (presumably in the range
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* 0 -> 23, since there are 3 8-bit interrupt-enable bits in the
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* interrupt mask PLD).
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*/
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#include <machine/asm.h>
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__KERNEL_RCSID(0, "$NetBSD: pci_eb164_intr.s,v 1.5 1997/09/02 13:19:42 thorpej Exp $");
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.text
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LEAF(eb164_intr_enable,1)
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mov a0, a1
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ldiq a0, 0x34
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call_pal PAL_cserve
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RET
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END(eb164_intr_enable)
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.text
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LEAF(eb164_intr_disable,1)
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mov a0, a1
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ldiq a0, 0x35
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call_pal PAL_cserve
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RET
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END(eb164_intr_disable)
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.text
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LEAF(eb164_intr_enable_icsr,1)
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mov a0, a1
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ldiq a0, 0x34
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call_pal PAL_cserve
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ldiq a0, 0x08 /* Allow PALRES */
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call_pal PAL_cserve
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.long 0x66100118 /* hw_mfpr a0, icsr */
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ldah a1, 0x0020 /* IMSK1 */
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or a0, a1, a0
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xor a0, a1, a0
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.long 0x76100118 /* hw_mtpr a0, icsr */
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ldiq a0, 0x09 /* Disable PALRES */
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call_pal PAL_cserve
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RET
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END(eb164_intr_enable_icsr)
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.text
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LEAF(eb164_intr_disable_icsr,1)
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ldiq a0, 0x08 /* Allow PALRES */
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call_pal PAL_cserve
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.long 0x66100118 /* hw_mfpr a0, icsr */
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ldah a1, 0x0020 /* IMSK1 */
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or a0, a1, a0
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.long 0x76100118 /* hw_mtpr a0, icsr */
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ldiq a0, 0x09 /* Disable PALRES */
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call_pal PAL_cserve
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RET
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END(eb164_intr_disable_icsr)
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