2 * Copyright (c) 2003, 2005 Alan L. Cox <alc@cs.rice.edu>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
29 #ifndef _MACHINE_SF_BUF_H_
30 #define _MACHINE_SF_BUF_H_
33 #include <vm/vm_param.h>
34 #include <vm/vm_page.h>
37 * On this machine, the only purpose for which sf_buf is used is to implement
38 * an opaque pointer required by the machine-independent parts of the kernel.
39 * That pointer references the vm_page that is "mapped" by the sf_buf. The
40 * actual mapping is provided by the direct virtual-to-physical mapping.
44 static inline struct sf_buf *
45 sf_buf_alloc(struct vm_page *m, int pri)
48 return ((struct sf_buf *)m);
52 sf_buf_free(struct sf_buf *sf)
56 static __inline vm_offset_t
57 sf_buf_kva(struct sf_buf *sf)
60 return (PHYS_TO_DMAP(VM_PAGE_TO_PHYS((vm_page_t)sf)));
63 static __inline vm_page_t
64 sf_buf_page(struct sf_buf *sf)
67 return ((vm_page_t)sf);
70 #endif /* !_MACHINE_SF_BUF_H_ */