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: releng/10.3/sys/powerpc/include/sf_buf.h 255318 2013-09-06 17:44:13Z glebius $ 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> 35190681Snwhitehorn#include <machine/md_var.h> 36176770Sraj#include <sys/queue.h> 37122780Salc 38176770Srajstruct vm_page; 39176770Sraj 40176770Srajstruct sf_buf { 41176770Sraj LIST_ENTRY(sf_buf) list_entry; /* list of buffers */ 42176770Sraj TAILQ_ENTRY(sf_buf) free_entry; /* list of buffers */ 43176770Sraj struct vm_page *m; /* currently mapped page */ 44176770Sraj vm_offset_t kva; /* va of mapping */ 45176770Sraj int ref_count; /* usage of this mapping */ 46176770Sraj}; 47176770Sraj 48255318Sglebiusstruct sf_buf * sf_buf_alloc(struct vm_page *m, int flags); 49255318Sglebiusvoid sf_buf_free(struct sf_buf *sf); 50255318Sglebius 51190681Snwhitehorn/* 52190681Snwhitehorn * On 32-bit OEA, the only purpose for which sf_buf is used is to implement 53190681Snwhitehorn * an opaque pointer required by the machine-independent parts of the kernel. 54190681Snwhitehorn * That pointer references the vm_page that is "mapped" by the sf_buf. The 55190681Snwhitehorn * actual mapping is provided by the direct virtual-to-physical mapping. 56190681Snwhitehorn * 57190681Snwhitehorn * On OEA64 and Book-E, we need to do something a little more complicated. Use 58190681Snwhitehorn * the runtime-detected hw_direct_map to pick between the two cases. Our 59190681Snwhitehorn * friends in vm_machdep.c will do the same to ensure nothing gets confused. 60190681Snwhitehorn */ 61190681Snwhitehorn 62176770Srajstatic __inline vm_offset_t 63176770Srajsf_buf_kva(struct sf_buf *sf) 64176770Sraj{ 65190681Snwhitehorn if (hw_direct_map) 66190681Snwhitehorn return (VM_PAGE_TO_PHYS((vm_page_t)sf)); 67176770Sraj 68176770Sraj return (sf->kva); 69176770Sraj} 70176770Sraj 71176770Srajstatic __inline struct vm_page * 72176770Srajsf_buf_page(struct sf_buf *sf) 73176770Sraj{ 74190681Snwhitehorn if (hw_direct_map) 75190681Snwhitehorn return ((vm_page_t)sf); 76176770Sraj 77176770Sraj return (sf->m); 78176770Sraj} 79176770Sraj 80122780Salc#endif /* !_MACHINE_SF_BUF_H_ */ 81