sf_buf.h revision 176770
1122780Salc/*- 2122780Salc * Copyright (c) 2003 Alan L. Cox <alc@cs.rice.edu> 3122780Salc * All rights reserved. 4122780Salc * 5122780Salc * Redistribution and use in source and binary forms, with or without 6122780Salc * modification, are permitted provided that the following conditions 7122780Salc * are met: 8122780Salc * 1. Redistributions of source code must retain the above copyright 9122780Salc * notice, this list of conditions and the following disclaimer. 10122780Salc * 2. Redistributions in binary form must reproduce the above copyright 11122780Salc * notice, this list of conditions and the following disclaimer in the 12122780Salc * documentation and/or other materials provided with the distribution. 13122780Salc * 14122780Salc * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15122780Salc * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16122780Salc * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17122780Salc * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18122780Salc * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19122780Salc * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20122780Salc * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21122780Salc * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22122780Salc * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23122780Salc * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24122780Salc * SUCH DAMAGE. 25122780Salc * 26122780Salc * $FreeBSD: head/sys/powerpc/include/sf_buf.h 176770 2008-03-03 13:20:52Z raj $ 27122780Salc */ 28122780Salc 29122780Salc#ifndef _MACHINE_SF_BUF_H_ 30122780Salc#define _MACHINE_SF_BUF_H_ 31122780Salc 32128395Salc#include <vm/vm.h> 33128395Salc#include <vm/vm_param.h> 34128395Salc#include <vm/vm_page.h> 35176770Sraj#include <sys/queue.h> 36122780Salc 37176770Sraj#if defined(AIM) 38128395Salc/* 39128395Salc * On this machine, the only purpose for which sf_buf is used is to implement 40128395Salc * an opaque pointer required by the machine-independent parts of the kernel. 41128395Salc * That pointer references the vm_page that is "mapped" by the sf_buf. The 42128395Salc * actual mapping is provided by the direct virtual-to-physical mapping. 43128395Salc */ 44128395Salcstruct sf_buf; 45122780Salc 46122780Salcstatic __inline vm_offset_t 47122780Salcsf_buf_kva(struct sf_buf *sf) 48122780Salc{ 49122780Salc 50128395Salc return (VM_PAGE_TO_PHYS((vm_page_t)sf)); 51122780Salc} 52122780Salc 53128395Salcstatic __inline vm_page_t 54122780Salcsf_buf_page(struct sf_buf *sf) 55122780Salc{ 56122780Salc 57128395Salc return ((vm_page_t)sf); 58122780Salc} 59122780Salc 60176770Sraj#elif defined(E500) 61176770Sraj 62176770Srajstruct vm_page; 63176770Sraj 64176770Srajstruct sf_buf { 65176770Sraj LIST_ENTRY(sf_buf) list_entry; /* list of buffers */ 66176770Sraj TAILQ_ENTRY(sf_buf) free_entry; /* list of buffers */ 67176770Sraj struct vm_page *m; /* currently mapped page */ 68176770Sraj vm_offset_t kva; /* va of mapping */ 69176770Sraj int ref_count; /* usage of this mapping */ 70176770Sraj}; 71176770Sraj 72176770Srajstatic __inline vm_offset_t 73176770Srajsf_buf_kva(struct sf_buf *sf) 74176770Sraj{ 75176770Sraj 76176770Sraj return (sf->kva); 77176770Sraj} 78176770Sraj 79176770Srajstatic __inline struct vm_page * 80176770Srajsf_buf_page(struct sf_buf *sf) 81176770Sraj{ 82176770Sraj 83176770Sraj return (sf->m); 84176770Sraj} 85176770Sraj 86176770Sraj#endif 87176770Sraj 88122780Salc#endif /* !_MACHINE_SF_BUF_H_ */ 89