| Isaku Yamahata | b15993f | 2008-04-02 10:54:01 -0700 | [diff] [blame] | 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 |
| 28 | struct 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. */ |
| 35 | struct xencomm_handle; |
| 36 | |
| 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); |
| 41 | |
| 42 | #if 0 |
| 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]; |
| 47 | #else |
| 48 | /* |
| 49 | * gcc bug workaround: |
| 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)))) |
| 53 | */ |
| 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))); |
| 62 | #endif |
| 63 | #define xencomm_map_no_alloc(ptr, bytes) \ |
| 64 | ({ XENCOMM_MINI_ALIGNED(xc_desc, 1); \ |
| 65 | __xencomm_map_no_alloc(ptr, bytes, xc_desc); }) |
| 66 | |
| 67 | /* provided by architecture code: */ |
| 68 | extern unsigned long xencomm_vtop(unsigned long vaddr); |
| 69 | |
| 70 | static inline void *xencomm_pa(void *ptr) |
| 71 | { |
| 72 | return (void *)xencomm_vtop((unsigned long)ptr); |
| 73 | } |
| 74 | |
| 75 | #define xen_guest_handle(hnd) ((hnd).p) |
| 76 | |
| 77 | #endif /* _LINUX_XENCOMM_H_ */ |