1178172Simp/*-
2206714Sjmallett * Copyright (c) 2003 Alan L. Cox <alc@cs.rice.edu>
3178172Simp * All rights reserved.
4178172Simp *
5178172Simp * Redistribution and use in source and binary forms, with or without
6178172Simp * modification, are permitted provided that the following conditions
7178172Simp * are met:
8178172Simp * 1. Redistributions of source code must retain the above copyright
9178172Simp *    notice, this list of conditions and the following disclaimer.
10178172Simp * 2. Redistributions in binary form must reproduce the above copyright
11178172Simp *    notice, this list of conditions and the following disclaimer in the
12178172Simp *    documentation and/or other materials provided with the distribution.
13178172Simp *
14178172Simp * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15178172Simp * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16178172Simp * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17178172Simp * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18178172Simp * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19178172Simp * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20178172Simp * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21178172Simp * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22178172Simp * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23178172Simp * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24178172Simp * SUCH DAMAGE.
25178172Simp *
26178172Simp * $FreeBSD$
27178172Simp */
28178172Simp
29178172Simp#ifndef _MACHINE_SF_BUF_H_
30206714Sjmallett#define _MACHINE_SF_BUF_H_
31178172Simp
32217944Sjchandra#ifdef __mips_n64
33217944Sjchandra#include <vm/vm.h>
34217944Sjchandra#include <vm/vm_param.h>
35217944Sjchandra#include <vm/vm_page.h>
36217944Sjchandra#else
37178172Simp#include <sys/queue.h>
38217944Sjchandra#endif
39178172Simp
40217944Sjchandra#ifdef __mips_n64
41217944Sjchandra/* In 64 bit the whole memory is directly mapped */
42217944Sjchandrastruct	sf_buf;
43217944Sjchandra
44255289Sglebiusstatic inline struct sf_buf *
45255289Sglebiussf_buf_alloc(struct vm_page *m, int pri)
46255289Sglebius{
47255289Sglebius
48255289Sglebius	return ((struct sf_buf *)m);
49255289Sglebius}
50255289Sglebius
51255289Sglebiusstatic inline void
52255289Sglebiussf_buf_free(struct sf_buf *sf)
53255289Sglebius{
54255289Sglebius}
55255289Sglebius
56217944Sjchandrastatic __inline vm_offset_t
57217944Sjchandrasf_buf_kva(struct sf_buf *sf)
58217944Sjchandra{
59217944Sjchandra	vm_page_t	m;
60217944Sjchandra
61217944Sjchandra	m = (vm_page_t)sf;
62217944Sjchandra	return (MIPS_PHYS_TO_DIRECT(VM_PAGE_TO_PHYS(m)));
63217944Sjchandra}
64217944Sjchandra
65217944Sjchandrastatic __inline struct vm_page *
66217944Sjchandrasf_buf_page(struct sf_buf *sf)
67217944Sjchandra{
68217944Sjchandra
69217944Sjchandra	return ((vm_page_t)sf);
70217944Sjchandra}
71217944Sjchandra
72217944Sjchandra#else /* ! __mips_n64 */
73178172Simpstruct vm_page;
74178172Simp
75178172Simpstruct sf_buf {
76206714Sjmallett	SLIST_ENTRY(sf_buf) free_list;	/* list of free buffer slots */
77178172Simp	struct		vm_page *m;	/* currently mapped page */
78178172Simp	vm_offset_t	kva;		/* va of mapping */
79178172Simp};
80178172Simp
81255318Sglebiusstruct sf_buf * sf_buf_alloc(struct vm_page *m, int flags);
82255318Sglebiusvoid sf_buf_free(struct sf_buf *sf);
83255318Sglebius
84178172Simpstatic __inline vm_offset_t
85178172Simpsf_buf_kva(struct sf_buf *sf)
86178172Simp{
87178172Simp
88178172Simp	return (sf->kva);
89178172Simp}
90178172Simp
91178172Simpstatic __inline struct vm_page *
92178172Simpsf_buf_page(struct sf_buf *sf)
93178172Simp{
94178172Simp
95178172Simp	return (sf->m);
96178172Simp}
97217944Sjchandra#endif /* __mips_n64 */
98178172Simp
99178172Simp#endif /* !_MACHINE_SF_BUF_H_ */
100