arch/ia64/include/asm/xen/irq.h

   1 /******************************************************************************
   2  * arch/ia64/include/asm/xen/irq.h
   3  *
   4  * Copyright (c) 2008 Isaku Yamahata <yamahata at valinux co jp>
   5  *                    VA Linux Systems Japan K.K.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  *
  21  */
  22
  23 #ifndef _ASM_IA64_XEN_IRQ_H
  24 #define _ASM_IA64_XEN_IRQ_H
  25
  26 /*
  27  * The flat IRQ space is divided into two regions:
  28  *  1. A one-to-one mapping of real physical IRQs. This space is only used
  29  *     if we have physical device-access privilege. This region is at the
  30  *     start of the IRQ space so that existing device drivers do not need
  31  *     to be modified to translate physical IRQ numbers into our IRQ space.
  32  *  3. A dynamic mapping of inter-domain and Xen-sourced virtual IRQs. These
  33  *     are bound using the provided bind/unbind functions.
  34  */
  35
  36 #define XEN_PIRQ_BASE           0
  37 #define XEN_NR_PIRQS            256
  38
  39 #define XEN_DYNIRQ_BASE         (XEN_PIRQ_BASE + XEN_NR_PIRQS)
  40 #define XEN_NR_DYNIRQS          (NR_CPUS * 8)
  41
  42 #define XEN_NR_IRQS             (XEN_NR_PIRQS + XEN_NR_DYNIRQS)
  43
  44 #endif /* _ASM_IA64_XEN_IRQ_H */