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      1 /* $NetBSD: pci_eb164_intr.s,v 1.7 2020/09/22 15:24:02 thorpej Exp $ */
      2 
      3 /*
      4  * Copyright (c) 1996 Carnegie-Mellon University.
      5  * All rights reserved.
      6  *
      7  * Author: Chris G. Demetriou
      8  *
      9  * Permission to use, copy, modify and distribute this software and
     10  * its documentation is hereby granted, provided that both the copyright
     11  * notice and this permission notice appear in all copies of the
     12  * software, derivative works or modified versions, and any portions
     13  * thereof, and that both notices appear in supporting documentation.
     14  *
     15  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     16  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
     17  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     18  *
     19  * Carnegie Mellon requests users of this software to return to
     20  *
     21  *  Software Distribution Coordinator  or  Software.Distribution (at) CS.CMU.EDU
     22  *  School of Computer Science
     23  *  Carnegie Mellon University
     24  *  Pittsburgh PA 15213-3890
     25  *
     26  * any improvements or extensions that they make and grant Carnegie the
     27  * rights to redistribute these changes.
     28  */
     29 
     30 /*
     31  * The description of how to enable and disable interrupts in the
     32  * AlphaPC 164 motherboard technical reference manual is incorrect,
     33  * at least for the OSF/1 PALcode.
     34  *
     35  * These functions were written by disassembling a Digital UNIX kernel's
     36  * eb164_intrdsabl and eb164_intrenabl functions (because they had
     37  * interesting names), and then playing with them to see how to call
     38  * them correctly.
     39  *
     40  * It looks like the right thing to do is to call them with the interrupt
     41  * request that you want to enable or disable (presumably in the range
     42  * 0 -> 23, since there are 3 8-bit interrupt-enable bits in the
     43  * interrupt mask PLD).
     44  */
     45 
     46 #include <machine/asm.h>
     47 
     48 __KERNEL_RCSID(0, "$NetBSD: pci_eb164_intr.s,v 1.7 2020/09/22 15:24:02 thorpej Exp $");
     49 
     50 /*
     51  * void eb164_intr_enable(pci_chipset_tag_t, int irq);
     52  * void eb164_intr_disenable(pci_chipset_tag_t, int irq);
     53  */
     54 
     55 	.text
     56 LEAF(eb164_intr_enable,2)
     57 	ldiq	a0, 0x34
     58 	call_pal PAL_cserve
     59 	RET
     60 	END(eb164_intr_enable)
     61 
     62 	.text
     63 LEAF(eb164_intr_disable,2)
     64 	ldiq	a0, 0x35
     65 	call_pal PAL_cserve
     66 	RET
     67 	END(eb164_intr_disable)
     68