1 /*-
2 * Copyright (c) 2003 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 * $FreeBSD$
27 */
28
29 #ifndef _MACHINE_SF_BUF_H_
30 #define _MACHINE_SF_BUF_H_
31
32 #ifdef __mips_n64
33 #include <vm/vm.h>
34 #include <vm/vm_param.h>
35 #include <vm/vm_page.h>
36 #else
37 #include <sys/queue.h>
38 #endif
39
40 #ifdef __mips_n64
41 /* In 64 bit the whole memory is directly mapped */
42 struct sf_buf;
43
44 static inline struct sf_buf *
sf_buf_alloc(struct vm_page * m,int pri)45 sf_buf_alloc(struct vm_page *m, int pri)
46 {
47
48 return ((struct sf_buf *)m);
49 }
50
51 static inline void
sf_buf_free(struct sf_buf * sf)52 sf_buf_free(struct sf_buf *sf)
53 {
54 }
55
56 static __inline vm_offset_t
sf_buf_kva(struct sf_buf * sf)57 sf_buf_kva(struct sf_buf *sf)
58 {
59 vm_page_t m;
60
61 m = (vm_page_t)sf;
62 return (MIPS_PHYS_TO_DIRECT(VM_PAGE_TO_PHYS(m)));
63 }
64
65 static __inline struct vm_page *
sf_buf_page(struct sf_buf * sf)66 sf_buf_page(struct sf_buf *sf)
67 {
68
69 return ((vm_page_t)sf);
70 }
71
72 #else /* ! __mips_n64 */
73 struct vm_page;
74
75 struct sf_buf {
76 SLIST_ENTRY(sf_buf) free_list; /* list of free buffer slots */
77 struct vm_page *m; /* currently mapped page */
78 vm_offset_t kva; /* va of mapping */
79 };
80
81 struct sf_buf * sf_buf_alloc(struct vm_page *m, int flags);
82 void sf_buf_free(struct sf_buf *sf);
83
84 static __inline vm_offset_t
sf_buf_kva(struct sf_buf * sf)85 sf_buf_kva(struct sf_buf *sf)
86 {
87
88 return (sf->kva);
89 }
90
91 static __inline struct vm_page *
sf_buf_page(struct sf_buf * sf)92 sf_buf_page(struct sf_buf *sf)
93 {
94
95 return (sf->m);
96 }
97 #endif /* __mips_n64 */
98
99 #endif /* !_MACHINE_SF_BUF_H_ */
100