2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
16 * Copyright (C) IBM Corp. 2006
18 * Authors: Hollis Blanchard <hollisb@us.ibm.com>
19 * Jerone Young <jyoung5@us.ibm.com>
22 #ifndef _LINUX_XENCOMM_H_
23 #define _LINUX_XENCOMM_H_
25 #include <xen/interface/xencomm.h>
27 #define XENCOMM_MINI_ADDRS 3
29 struct xencomm_desc _desc;
30 uint64_t address[XENCOMM_MINI_ADDRS];
33 /* To avoid additionnal virt to phys conversion, an opaque structure is
35 struct xencomm_handle;
37 extern void xencomm_free(struct xencomm_handle *desc);
38 extern struct xencomm_handle *xencomm_map(void *ptr, unsigned long bytes);
39 extern struct xencomm_handle *__xencomm_map_no_alloc(void *ptr,
40 unsigned long bytes, struct xencomm_mini *xc_area);
43 #define XENCOMM_MINI_ALIGNED(xc_desc, n) \
44 struct xencomm_mini xc_desc ## _base[(n)] \
45 __attribute__((__aligned__(sizeof(struct xencomm_mini)))); \
46 struct xencomm_mini *xc_desc = &xc_desc ## _base[0];
50 * http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16660
51 * gcc doesn't handle properly stack variable with
52 * __attribute__((__align__(sizeof(struct xencomm_mini))))
54 #define XENCOMM_MINI_ALIGNED(xc_desc, n) \
55 unsigned char xc_desc ## _base[((n) + 1 ) * \
56 sizeof(struct xencomm_mini)]; \
57 struct xencomm_mini *xc_desc = (struct xencomm_mini *) \
58 ((unsigned long)xc_desc ## _base + \
59 (sizeof(struct xencomm_mini) - \
60 ((unsigned long)xc_desc ## _base) % \
61 sizeof(struct xencomm_mini)));
63 #define xencomm_map_no_alloc(ptr, bytes) \
64 ({ XENCOMM_MINI_ALIGNED(xc_desc, 1); \
65 __xencomm_map_no_alloc(ptr, bytes, xc_desc); })
67 /* provided by architecture code: */
68 extern unsigned long xencomm_vtop(unsigned long vaddr);
70 static inline void *xencomm_pa(void *ptr)
72 return (void *)xencomm_vtop((unsigned long)ptr);
75 #define xen_guest_handle(hnd) ((hnd).p)
77 #endif /* _LINUX_XENCOMM_H_ */