sys/arch/alpha/pci/pci_eb164_intr.s

   1 /* $NetBSD: pci_eb164_intr.s,v 1.5 1997/09/02 13:19:42 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@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 1.5 1997/09/02 13:19:42 thorpej Exp $");
  49
  50         .text
  51 LEAF(eb164_intr_enable,1)
  52         mov     a0, a1
  53         ldiq    a0, 0x34
  54         call_pal PAL_cserve
  55         RET
  56         END(eb164_intr_enable)
  57
  58         .text
  59 LEAF(eb164_intr_disable,1)
  60         mov     a0, a1
  61         ldiq    a0, 0x35
  62         call_pal PAL_cserve
  63         RET
  64         END(eb164_intr_disable)