/*
* 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
*
* Copyright (C) IBM Corp. 2006
*
* Authors: Hollis Blanchard <[email protected]>
* Jerone Young <[email protected]>
*/

#ifndef _LINUX_XENCOMM_H_
#define _LINUX_XENCOMM_H_

#include <xen/interface/xencomm.h>

#define XENCOMM_MINI_ADDRS 3
struct xencomm_mini {
struct xencomm_desc _desc;
uint64_t address[XENCOMM_MINI_ADDRS];
};

/* To avoid additionnal virt to phys conversion, an opaque structure is
presented. */
struct xencomm_handle;

extern void xencomm_free(struct xencomm_handle *desc);
extern struct xencomm_handle *xencomm_map(void *ptr, unsigned long bytes);
extern struct xencomm_handle *__xencomm_map_no_alloc(void *ptr,
unsigned long bytes, struct xencomm_mini *xc_area);

#if 0
#define XENCOMM_MINI_ALIGNED(xc_desc, n) \
struct xencomm_mini xc_desc ## _base[(n)] \
__attribute__((__aligned__(sizeof(struct xencomm_mini)))); \
struct xencomm_mini *xc_desc = &xc_desc ## _base[0];
#else
/*
* gcc bug workaround:
* http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16660
* gcc doesn't handle properly stack variable with
* __attribute__((__align__(sizeof(struct xencomm_mini))))
*/
#define XENCOMM_MINI_ALIGNED(xc_desc, n) \
unsigned char xc_desc ## _base[((n) + 1 ) * \
sizeof(struct xencomm_mini)]; \
struct xencomm_mini *xc_desc = (struct xencomm_mini *) \
((unsigned long)xc_desc ## _base + \
(sizeof(struct xencomm_mini) - \
((unsigned long)xc_desc ## _base) % \
sizeof(struct xencomm_mini)));
#endif
#define xencomm_map_no_alloc(ptr, bytes) \
({ XENCOMM_MINI_ALIGNED(xc_desc, 1); \
__xencomm_map_no_alloc(ptr, bytes, xc_desc); })

/* provided by architecture code: */
extern unsigned long xencomm_vtop(unsigned long vaddr);

static inline void *xencomm_pa(void *ptr)
{
return (void *)xencomm_vtop((unsigned long)ptr);
}

#define xen_guest_handle(hnd) ((hnd).p)

#endif /* _LINUX_XENCOMM_H_ */