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Annotation of Net2/vm/vm_pager.h, revision 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:  *     @(#)vm_pager.h  7.2 (Berkeley) 4/20/91
        !            39:  */
        !            40: 
        !            41: /*
        !            42:  * Pager routine interface definition.
        !            43:  * For BSD we use a cleaner version of the internal pager interface.
        !            44:  */
        !            45: 
        !            46: #ifndef        _VM_PAGER_
        !            47: #define        _VM_PAGER_
        !            48: 
        !            49: struct pager_struct {
        !            50:        queue_head_t    pg_list;        /* links for list management */
        !            51:        caddr_t         pg_handle;      /* external handle (vp, dev, fp) */
        !            52:        int             pg_type;        /* type of pager */
        !            53:        struct pagerops *pg_ops;        /* pager operations */
        !            54:        caddr_t         pg_data;        /* private pager data */
        !            55: };
        !            56: typedef        struct pager_struct *vm_pager_t;
        !            57: 
        !            58: /* pager types */
        !            59: #define PG_DFLT                -1
        !            60: #define        PG_SWAP         0
        !            61: #define        PG_VNODE        1
        !            62: #define PG_DEVICE      2
        !            63: 
        !            64: struct pagerops {
        !            65:        void            (*pgo_init)();          /* initialize pager */
        !            66:        vm_pager_t      (*pgo_alloc)();         /* allocate pager */
        !            67:        void            (*pgo_dealloc)();       /* disassociate */
        !            68:        int             (*pgo_getpage)();       /* get (read) page */
        !            69:        int             (*pgo_putpage)();       /* put (write) page */
        !            70:        boolean_t       (*pgo_haspage)();       /* does pager have page? */
        !            71: };
        !            72: 
        !            73: /*
        !            74:  * get/put return values
        !            75:  * OK  operation was successful
        !            76:  * BAD specified data was out of the accepted range
        !            77:  * FAIL        specified data was in range, but doesn't exist
        !            78:  * PEND        operations was initiated but not completed
        !            79:  */
        !            80: #define        VM_PAGER_OK     0
        !            81: #define        VM_PAGER_BAD    1
        !            82: #define        VM_PAGER_FAIL   2
        !            83: #define        VM_PAGER_PEND   3
        !            84: 
        !            85: #define        VM_PAGER_ALLOC(h, s, p)         (*(pg)->pg_ops->pgo_alloc)(h, s, p)
        !            86: #define        VM_PAGER_DEALLOC(pg)            (*(pg)->pg_ops->pgo_dealloc)(pg)
        !            87: #define        VM_PAGER_GET(pg, m, s)          (*(pg)->pg_ops->pgo_getpage)(pg, m, s)
        !            88: #define        VM_PAGER_PUT(pg, m, s)          (*(pg)->pg_ops->pgo_putpage)(pg, m, s)
        !            89: #define        VM_PAGER_HASPAGE(pg, o)         (*(pg)->pg_ops->pgo_haspage)(pg, o)
        !            90: 
        !            91: #ifdef KERNEL
        !            92: vm_pager_t     vm_pager_allocate();
        !            93: void           vm_pager_deallocate();
        !            94: int            vm_pager_get();
        !            95: int            vm_pager_put();
        !            96: boolean_t      vm_pager_has_page();
        !            97: 
        !            98: vm_offset_t    vm_pager_map_page();
        !            99: void           vm_pager_unmap_page();
        !           100: vm_pager_t     vm_pager_lookup();
        !           101: void           vm_pager_sync();
        !           102: 
        !           103: extern struct pagerops *dfltpagerops;
        !           104: #endif
        !           105: 
        !           106: #endif /* _VM_PAGER_ */

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