Edit File: xencomm.h
/* * 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 <hollisb@us.ibm.com> * Jerone Young <jyoung5@us.ibm.com> */ #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_ */