projects / dragonfly.git / blame
| Commit | Line | Data |
|---|---|---|
| 5c5185ae SG |
1 | /* |
| 2 | * Copyright (c) 2010 by The DragonFly Project and Samuel J. Greear. | |
| 3 | * All rights reserved. | |
| 4 | * | |
| 5 | * This code is derived from software contributed to The DragonFly Project | |
| 6 | * by Samuel J. Greear <sjg@thesjg.com> | |
| 7 | * | |
| 8 | * Redistribution and use in source and binary forms, with or without | |
| 9 | * modification, are permitted provided that the following conditions | |
| 10 | * are met: | |
| 11 | * | |
| 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 | |
| 17 | * distribution. | |
| 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. | |
| 21 | * | |
| 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 | |
| 33 | * SUCH DAMAGE. | |
| 34 | */ | |
| 35 | ||
| 36 | #ifndef _CPU_LWBUF_H_ | |
| 37 | #define _CPU_LWBUF_H_ | |
| 38 | ||
| 39 | #ifndef _SYS_TYPES_H_ | |
| 40 | #include <sys/types.h> | |
| 41 | #endif | |
| 42 | #ifndef _SYS_GLOBALDATA_H_ | |
| 43 | #include <sys/globaldata.h> | |
| 44 | #endif | |
| 45 | #ifndef _VM_PMAP_H_ | |
| 46 | #include <vm/pmap.h> | |
| 47 | #endif | |
| 46751036 SG |
48 | #ifndef _VM_VM_PAGE_H_ |
| 49 | #include <vm/vm_page.h> | |
| 50 | #endif | |
| 5c5185ae | 51 | #include <machine/atomic.h> |
| 7a683a24 MD |
52 | #ifndef _MACHINE_VMPARAM_H_ |
| 53 | #include <machine/vmparam.h> | |
| 54 | #endif | |
| 5c5185ae SG |
55 | |
| 56 | #if !defined(_KERNEL) && !defined(_KERNEL_STRUCTURES) | |
| 57 | #error "This file should not be included by userland programs." | |
| 58 | #endif | |
| 59 | ||
| 60 | struct lwbuf { | |
| 7a683a24 MD |
61 | vm_page_t m; /* currently mapped page */ |
| 62 | vm_offset_t kva; /* va of mapping */ | |
| 5c5185ae SG |
63 | }; |
| 64 | ||
| 65 | static __inline vm_page_t | |
| 7a683a24 MD |
66 | lwbuf_page(struct lwbuf *lwb) |
| 67 | { | |
| 68 | return (lwb->m); | |
| 5c5185ae SG |
69 | } |
| 70 | ||
| 71 | static __inline vm_offset_t | |
| 7a683a24 MD |
72 | lwbuf_kva(struct lwbuf *lwb) |
| 73 | { | |
| 74 | return (lwb->kva); | |
| 75 | } | |
| 76 | ||
| 77 | static __inline struct lwbuf * | |
| 78 | lwbuf_alloc(vm_page_t m, struct lwbuf *lwb_cache) | |
| 79 | { | |
| 80 | struct lwbuf *lwb = lwb_cache; | |
| 81 | ||
| 82 | lwb->m = m; | |
| 83 | lwb->kva = PHYS_TO_DMAP(VM_PAGE_TO_PHYS(lwb->m)); | |
| 84 | ||
| 85 | return (lwb); | |
| 86 | } | |
| 87 | ||
| 88 | static __inline void | |
| 89 | lwbuf_free(struct lwbuf *lwb) | |
| 90 | { | |
| 91 | lwb->m = NULL; /* safety */ | |
| 5c5185ae SG |
92 | } |
| 93 | ||
| 94 | #define lwbuf_set_global(lwb) | |
| 95 | ||
| 68ad1455 MD |
96 | /* tell the kernel that lwbufs are cheap */ |
| 97 | #define LWBUF_IS_OPTIMAL | |
| 98 | ||
| 5c5185ae SG |
99 | #if defined(_KERNEL) |
| 100 | ||
| 5c5185ae SG |
101 | #endif |
| 102 | ||
| 103 | #endif /* !_CPU_LWBUF_H_ */ |