2 * Copyright (c) 2010 by The DragonFly Project and Samuel J. Greear.
5 * This code is derived from software contributed to The DragonFly Project
6 * by Samuel J. Greear <sjg@thesjg.com>
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
18 * 3. Neither the name of The DragonFly Project nor the names of its
19 * contributors may be used to endorse or promote products derived
20 * from this software without specific, prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
25 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
26 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
27 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
28 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
29 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
30 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
31 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
32 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
40 #include <sys/types.h>
42 #ifndef _SYS_GLOBALDATA_H_
43 #include <sys/globaldata.h>
48 #ifndef _VM_VM_PAGE_H_
49 #include <vm/vm_page.h>
51 #include <machine/atomic.h>
52 #ifndef _MACHINE_VMPARAM_H_
53 #include <machine/vmparam.h>
56 #if !defined(_KERNEL) && !defined(_KERNEL_STRUCTURES)
57 #error "This file should not be included by userland programs."
61 vm_page_t m; /* currently mapped page */
62 vm_offset_t kva; /* va of mapping */
65 static __inline vm_page_t
66 lwbuf_page(struct lwbuf *lwb)
71 static __inline vm_offset_t
72 lwbuf_kva(struct lwbuf *lwb)
77 static __inline struct lwbuf *
78 lwbuf_alloc(vm_page_t m, struct lwbuf *lwb_cache)
80 struct lwbuf *lwb = lwb_cache;
83 lwb->kva = PHYS_TO_DMAP(VM_PAGE_TO_PHYS(lwb->m));
89 lwbuf_free(struct lwbuf *lwb)
91 lwb->m = NULL; /* safety */
94 #define lwbuf_set_global(lwb)
96 /* tell the kernel that lwbufs are cheap */
97 #define LWBUF_IS_OPTIMAL
103 #endif /* !_CPU_LWBUF_H_ */