1/* 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. 6 * 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. 11 * 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 15 * 16 * Copyright (C) IBM Corp. 2006 17 * 18 * Authors: Hollis Blanchard <hollisb@us.ibm.com> 19 * Jerone Young <jyoung5@us.ibm.com> 20 */ 21 22#ifndef _LINUX_XENCOMM_H_ 23#define _LINUX_XENCOMM_H_ 24 25#include <xen/interface/xencomm.h> 26 27#define XENCOMM_MINI_ADDRS 3 28struct xencomm_mini { 29 struct xencomm_desc _desc; 30 uint64_t address[XENCOMM_MINI_ADDRS]; 31}; 32 33/* To avoid additionnal virt to phys conversion, an opaque structure is 34 presented. */ 35struct xencomm_handle; 36 37extern void xencomm_free(struct xencomm_handle *desc); 38extern struct xencomm_handle *xencomm_map(void *ptr, unsigned long bytes); 39extern struct xencomm_handle *__xencomm_map_no_alloc(void *ptr, 40 unsigned long bytes, struct xencomm_mini *xc_area); 41 42#define XENCOMM_MINI_ALIGNED(xc_desc, n) \ 43 unsigned char xc_desc ## _base[((n) + 1 ) * \ 44 sizeof(struct xencomm_mini)]; \ 45 struct xencomm_mini *xc_desc = (struct xencomm_mini *) \ 46 ((unsigned long)xc_desc ## _base + \ 47 (sizeof(struct xencomm_mini) - \ 48 ((unsigned long)xc_desc ## _base) % \ 49 sizeof(struct xencomm_mini))); 50#define xencomm_map_no_alloc(ptr, bytes) \ 51 ({ XENCOMM_MINI_ALIGNED(xc_desc, 1); \ 52 __xencomm_map_no_alloc(ptr, bytes, xc_desc); }) 53 54/* provided by architecture code: */ 55extern unsigned long xencomm_vtop(unsigned long vaddr); 56 57static inline void *xencomm_pa(void *ptr) 58{ 59 return (void *)xencomm_vtop((unsigned long)ptr); 60} 61 62#define xen_guest_handle(hnd) ((hnd).p) 63 64#endif /* _LINUX_XENCOMM_H_ */ 65