| 1 | /*- |
| 2 | * Copyright (c) 2003, 2005 Alan L. Cox <alc@cs.rice.edu> |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * 1. Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in the |
| 12 | * documentation and/or other materials provided with the distribution. |
| 13 | * |
| 14 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
| 15 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 16 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 17 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| 18 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 19 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 20 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 21 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 22 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 23 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 24 | * SUCH DAMAGE. |
| 25 | */ |
| 26 | |
| 27 | #ifndef _MACHINE_SF_BUF_H_ |
| 28 | #define _MACHINE_SF_BUF_H_ |
| 29 | |
| 30 | /* |
| 31 | * On this machine, the only purpose for which sf_buf is used is to implement |
| 32 | * an opaque pointer required by the machine-independent parts of the kernel. |
| 33 | * That pointer references the vm_page that is "mapped" by the sf_buf. The |
| 34 | * actual mapping is provided by the direct virtual-to-physical mapping. |
| 35 | */ |
| 36 | static inline vm_offset_t |
| 37 | sf_buf_kva(struct sf_buf *sf) |
| 38 | { |
| 39 | |
| 40 | return (PHYS_TO_DMAP(VM_PAGE_TO_PHYS((vm_page_t)sf))); |
| 41 | } |
| 42 | |
| 43 | static inline vm_page_t |
| 44 | sf_buf_page(struct sf_buf *sf) |
| 45 | { |
| 46 | |
| 47 | return ((vm_page_t)sf); |
| 48 | } |
| 49 | #endif /* !_MACHINE_SF_BUF_H_ */ |