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Annotation of Net2/vm/device_pager.h, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1990 University of Utah.
                      3:  * Copyright (c) 1991 The Regents of the University of California.
                      4:  * All rights reserved.
                      5:  *
                      6:  * This code is derived from software contributed to Berkeley by
                      7:  * the Systems Programming Group of the University of Utah Computer
                      8:  * Science Department.
                      9:  *
                     10:  * Redistribution and use in source and binary forms, with or without
                     11:  * modification, are permitted provided that the following conditions
                     12:  * are met:
                     13:  * 1. Redistributions of source code must retain the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer.
                     15:  * 2. Redistributions in binary form must reproduce the above copyright
                     16:  *    notice, this list of conditions and the following disclaimer in the
                     17:  *    documentation and/or other materials provided with the distribution.
                     18:  * 3. All advertising materials mentioning features or use of this software
                     19:  *    must display the following acknowledgement:
                     20:  *     This product includes software developed by the University of
                     21:  *     California, Berkeley and its contributors.
                     22:  * 4. Neither the name of the University nor the names of its contributors
                     23:  *    may be used to endorse or promote products derived from this software
                     24:  *    without specific prior written permission.
                     25:  *
                     26:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     27:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     28:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     29:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     30:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     31:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     32:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     33:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     34:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     35:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     36:  * SUCH DAMAGE.
                     37:  *
                     38:  *     @(#)device_pager.h      7.1 (Berkeley) 12/5/90
                     39:  */
                     40: 
                     41: #ifndef        _DEVICE_PAGER_
                     42: #define        _DEVICE_PAGER_  1
                     43: 
                     44: /*
                     45:  * Device pager private data.
                     46:  */
                     47: struct devpager {
                     48:        queue_head_t    devp_list;      /* list of managed devices */
                     49:        dev_t           devp_dev;       /* devno of device */
                     50:        vm_page_t       devp_pages;     /* page structs for device */
                     51:        int             devp_npages;    /* size of device in pages */
                     52:        int             devp_count;     /* reference count */
                     53:        vm_object_t     devp_object;    /* object representing this device */
                     54: };
                     55: typedef struct devpager        *dev_pager_t;
                     56: 
                     57: #define DEV_PAGER_NULL ((dev_pager_t)0)
                     58: 
                     59: #ifdef KERNEL
                     60: 
                     61: void           dev_pager_init();
                     62: vm_pager_t     dev_pager_alloc();
                     63: void           dev_pager_dealloc();
                     64: boolean_t      dev_pager_getpage(), dev_pager_putpage();
                     65: boolean_t      dev_pager_haspage();
                     66: 
                     67: struct pagerops devicepagerops = {
                     68:        dev_pager_init,
                     69:        dev_pager_alloc,
                     70:        dev_pager_dealloc,
                     71:        dev_pager_getpage,
                     72:        dev_pager_putpage,
                     73:        dev_pager_haspage
                     74: };
                     75: 
                     76: #endif
                     77: 
                     78: #endif /* _DEVICE_PAGER_ */

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