diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/xen/interface/xencomm.h | 41 | ||||
| -rw-r--r-- | include/xen/xencomm.h | 77 |
2 files changed, 118 insertions, 0 deletions
diff --git a/include/xen/interface/xencomm.h b/include/xen/interface/xencomm.h new file mode 100644 index 000000000000..ac45e0712afa --- /dev/null +++ b/include/xen/interface/xencomm.h @@ -0,0 +1,41 @@ +/* + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to + * deal in the Software without restriction, including without limitation the + * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or + * sell copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER + * DEALINGS IN THE SOFTWARE. + * + * Copyright (C) IBM Corp. 2006 + */ + +#ifndef _XEN_XENCOMM_H_ +#define _XEN_XENCOMM_H_ + +/* A xencomm descriptor is a scatter/gather list containing physical + * addresses corresponding to a virtually contiguous memory area. The + * hypervisor translates these physical addresses to machine addresses to copy + * to and from the virtually contiguous area. + */ + +#define XENCOMM_MAGIC 0x58434F4D /* 'XCOM' */ +#define XENCOMM_INVALID (~0UL) + +struct xencomm_desc { + uint32_t magic; + uint32_t nr_addrs; /* the number of entries in address[] */ + uint64_t address[0]; +}; + +#endif /* _XEN_XENCOMM_H_ */ diff --git a/include/xen/xencomm.h b/include/xen/xencomm.h new file mode 100644 index 000000000000..e43b039be112 --- /dev/null +++ b/include/xen/xencomm.h @@ -0,0 +1,77 @@ +/* + * 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_ */ |