[dragonfly.git] / sys / cpu / x86_64 / include / lwbuf.h

/*
 * Copyright (c) 2010 by The DragonFly Project and Samuel J. Greear.
 * All rights reserved.
 *
 * This code is derived from software contributed to The DragonFly Project
 * by Samuel J. Greear <sjg@thesjg.com>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name of The DragonFly Project nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific, prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef _CPU_LWBUF_H_
#define _CPU_LWBUF_H_

#ifndef _SYS_TYPES_H_
#include <sys/types.h>
#endif
#ifndef _SYS_GLOBALDATA_H_
#include <sys/globaldata.h>
#endif
#ifndef _VM_PMAP_H_
#include <vm/pmap.h>
#endif
#ifndef _VM_VM_PAGE_H_
#include <vm/vm_page.h>
#endif
#ifndef _MACHINE_ATOMIC_H_
#include <machine/atomic.h>
#endif
#ifndef _MACHINE_VMPARAM_H_
#include <machine/vmparam.h>
#endif

#if !defined(_KERNEL) && !defined(_KERNEL_STRUCTURES)
#error "This file should not be included by userland programs."
#endif

struct lwbuf {
	vm_page_t	m;	/* currently mapped page */
	vm_offset_t	kva;	/* va of mapping */
};

static __inline vm_page_t
lwbuf_page(struct lwbuf *lwb)
{
	return (lwb->m);
}

static __inline vm_offset_t
lwbuf_kva(struct lwbuf *lwb)
{
	return (lwb->kva);
}

static __inline struct lwbuf *
lwbuf_alloc(vm_page_t m, struct lwbuf *lwb_cache)
{
	struct lwbuf *lwb = lwb_cache;

	lwb->m = m;
	lwb->kva = PHYS_TO_DMAP(VM_PAGE_TO_PHYS(lwb->m));

	return (lwb);
}

static __inline void
lwbuf_free(struct lwbuf *lwb)
{
	lwb->m = NULL;	/* safety */
}

#define lwbuf_set_global(lwb)

#if defined(_KERNEL)

#endif

#endif /* !_CPU_LWBUF_H_ */
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 SG	51	#ifndef _MACHINE_ATOMIC_H_
	52	#include <machine/atomic.h>
	53	#endif
7a683a24 MD	54	#ifndef _MACHINE_VMPARAM_H_
	55	#include <machine/vmparam.h>
	56	#endif
5c5185ae SG	57
	58	#if !defined(_KERNEL) && !defined(_KERNEL_STRUCTURES)
	59	#error "This file should not be included by userland programs."
	60	#endif
	61
	62	struct lwbuf {
7a683a24 MD	63	vm_page_t m; /* currently mapped page */
7a683a24 MD	64	vm_offset_t kva; /* va of mapping */
5c5185ae SG	65	};
	66
	67	static __inline vm_page_t
7a683a24 MD	68	lwbuf_page(struct lwbuf *lwb)
	69	{
	70	return (lwb->m);
5c5185ae SG	71	}
	72
	73	static __inline vm_offset_t
7a683a24 MD	74	lwbuf_kva(struct lwbuf *lwb)
	75	{
	76	return (lwb->kva);
	77	}
	78
	79	static __inline struct lwbuf *
	80	lwbuf_alloc(vm_page_t m, struct lwbuf *lwb_cache)
	81	{
	82	struct lwbuf *lwb = lwb_cache;
	83
	84	lwb->m = m;
	85	lwb->kva = PHYS_TO_DMAP(VM_PAGE_TO_PHYS(lwb->m));
	86
	87	return (lwb);
	88	}
	89
	90	static __inline void
	91	lwbuf_free(struct lwbuf *lwb)
	92	{
	93	lwb->m = NULL; /* safety */
5c5185ae SG	94	}
	95
	96	#define lwbuf_set_global(lwb)
	97
	98	#if defined(_KERNEL)
	99
5c5185ae SG	100	#endif
	101
	102	#endif /* !_CPU_LWBUF_H_ */