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

   1 /*
   2  * Copyright (C) 2006 Hollis Blanchard <hollisb@us.ibm.com>, IBM Corporation
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  17  */
  18
  19 #ifndef _ASM_IA64_XEN_XENCOMM_H
  20 #define _ASM_IA64_XEN_XENCOMM_H
  21
  22 #include <xen/xencomm.h>
  23 #include <asm/pgtable.h>
  24
  25 /* Must be called before any hypercall.  */
  26 extern void xencomm_initialize(void);
  27 extern int xencomm_is_initialized(void);
  28
  29 /* Check if virtual contiguity means physical contiguity
  30  * where the passed address is a pointer value in virtual address.
  31  * On ia64, identity mapping area in region 7 or the piece of region 5
  32  * that is mapped by itr[IA64_TR_KERNEL]/dtr[IA64_TR_KERNEL]
  33  */
  34 static inline int xencomm_is_phys_contiguous(unsigned long addr)
  35 {
  36         return (PAGE_OFFSET <= addr &&
  37                 addr < (PAGE_OFFSET + (1UL << IA64_MAX_PHYS_BITS))) ||
  38                 (KERNEL_START <= addr &&
  39                  addr < KERNEL_START + KERNEL_TR_PAGE_SIZE);
  40 }
  41
  42 #endif /* _ASM_IA64_XEN_XENCOMM_H */