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.  */
26extern void xencomm_initialize(void);
27extern 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 */
34static 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 */