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/*-
* Copyright (c) 2003 Alan L. Cox <alc@cs.rice.edu>
* All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*
* $FreeBSD$
*/
#ifndef _MACHINE_SF_BUF_H_
#define _MACHINE_SF_BUF_H_
#include <vm/vm.h>
#include <vm/vm_param.h>
#include <vm/vm_page.h>
#include <machine/md_var.h>
#include <sys/queue.h>
struct vm_page;
struct sf_buf {
LIST_ENTRY(sf_buf) list_entry; /* list of buffers */
TAILQ_ENTRY(sf_buf) free_entry; /* list of buffers */
struct vm_page *m; /* currently mapped page */
vm_offset_t kva; /* va of mapping */
int ref_count; /* usage of this mapping */
};
/*
* On 32-bit OEA, the only purpose for which sf_buf is used is to implement
* an opaque pointer required by the machine-independent parts of the kernel.
* That pointer references the vm_page that is "mapped" by the sf_buf. The
* actual mapping is provided by the direct virtual-to-physical mapping.
*
* On OEA64 and Book-E, we need to do something a little more complicated. Use
* the runtime-detected hw_direct_map to pick between the two cases. Our
* friends in vm_machdep.c will do the same to ensure nothing gets confused.
*/
static __inline vm_offset_t
sf_buf_kva(struct sf_buf *sf)
{
if (hw_direct_map)
return (VM_PAGE_TO_PHYS((vm_page_t)sf));
return (sf->kva);
}
static __inline struct vm_page *
sf_buf_page(struct sf_buf *sf)
{
if (hw_direct_map)
return ((vm_page_t)sf);
return (sf->m);
}
#endif /* !_MACHINE_SF_BUF_H_ */
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