1/*- 2 * Copyright (c) 2003 Alan L. Cox <alc@cs.rice.edu> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD$ 27 */ 28 29#ifndef _MACHINE_SF_BUF_H_ 30#define _MACHINE_SF_BUF_H_ 31 32#ifdef __mips_n64 33#include <vm/vm.h> 34#include <vm/vm_param.h> 35#include <vm/vm_page.h> 36#else 37#include <sys/queue.h> 38#endif 39 40#ifdef __mips_n64 41/* In 64 bit the whole memory is directly mapped */ 42struct sf_buf; 43 44static inline struct sf_buf * 45sf_buf_alloc(struct vm_page *m, int pri) 46{ 47 48 return ((struct sf_buf *)m); 49} 50 51static inline void 52sf_buf_free(struct sf_buf *sf) 53{ 54} 55 56static __inline vm_offset_t 57sf_buf_kva(struct sf_buf *sf) 58{ 59 vm_page_t m; 60 61 m = (vm_page_t)sf; 62 return (MIPS_PHYS_TO_DIRECT(VM_PAGE_TO_PHYS(m))); 63} 64 65static __inline struct vm_page * 66sf_buf_page(struct sf_buf *sf) 67{ 68 69 return ((vm_page_t)sf); 70} 71 72#else /* ! __mips_n64 */ 73struct vm_page; 74 75struct sf_buf { 76 SLIST_ENTRY(sf_buf) free_list; /* list of free buffer slots */ 77 struct vm_page *m; /* currently mapped page */ 78 vm_offset_t kva; /* va of mapping */ 79}; 80 81struct sf_buf * sf_buf_alloc(struct vm_page *m, int flags); 82void sf_buf_free(struct sf_buf *sf); 83 84static __inline vm_offset_t 85sf_buf_kva(struct sf_buf *sf) 86{ 87 88 return (sf->kva); 89} 90 91static __inline struct vm_page * 92sf_buf_page(struct sf_buf *sf) 93{ 94 95 return (sf->m); 96} 97#endif /* __mips_n64 */ 98 99#endif /* !_MACHINE_SF_BUF_H_ */ 100