linux/arch/ia64/include/asm/xen/xencomm.h
Isaku Yamahata f021c8b334 ia64/xen: xencomm conversion functions for hypercalls
On ia64/xen, pointer arguments for hypercall is passed
by pseudo physical address(guest physical address.)
So such hypercalls needs address conversion functions.
This patch implements concrete conversion functions for
such hypercalls.

Signed-off-by: Akio Takebe <takebe_akio@jp.fujitsu.com>
Signed-off-by: Yaozu (Eddie) Dong <eddie.dong@intel.com>
Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: Tony Luck <tony.luck@intel.com>
2008-10-17 10:00:19 -07:00

43 lines
1.5 KiB
C

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