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Annotation of Net2/vm/vm_param.h, revision 1.1

1.1     ! root        1: /* 
        !             2:  * Copyright (c) 1991 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * This code is derived from software contributed to Berkeley by
        !             6:  * The Mach Operating System project at Carnegie-Mellon University.
        !             7:  *
        !             8:  * Redistribution and use in source and binary forms, with or without
        !             9:  * modification, are permitted provided that the following conditions
        !            10:  * are met:
        !            11:  * 1. Redistributions of source code must retain the above copyright
        !            12:  *    notice, this list of conditions and the following disclaimer.
        !            13:  * 2. Redistributions in binary form must reproduce the above copyright
        !            14:  *    notice, this list of conditions and the following disclaimer in the
        !            15:  *    documentation and/or other materials provided with the distribution.
        !            16:  * 3. All advertising materials mentioning features or use of this software
        !            17:  *    must display the following acknowledgement:
        !            18:  *     This product includes software developed by the University of
        !            19:  *     California, Berkeley and its contributors.
        !            20:  * 4. Neither the name of the University nor the names of its contributors
        !            21:  *    may be used to endorse or promote products derived from this software
        !            22:  *    without specific prior written permission.
        !            23:  *
        !            24:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            25:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            26:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            27:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            28:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            29:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            30:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            31:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            32:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            33:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            34:  * SUCH DAMAGE.
        !            35:  *
        !            36:  *     @(#)vm_param.h  7.2 (Berkeley) 4/21/91
        !            37:  *
        !            38:  *
        !            39:  * Copyright (c) 1987, 1990 Carnegie-Mellon University.
        !            40:  * All rights reserved.
        !            41:  *
        !            42:  * Authors: Avadis Tevanian, Jr., Michael Wayne Young
        !            43:  * 
        !            44:  * Permission to use, copy, modify and distribute this software and
        !            45:  * its documentation is hereby granted, provided that both the copyright
        !            46:  * notice and this permission notice appear in all copies of the
        !            47:  * software, derivative works or modified versions, and any portions
        !            48:  * thereof, and that both notices appear in supporting documentation.
        !            49:  * 
        !            50:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 
        !            51:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 
        !            52:  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
        !            53:  * 
        !            54:  * Carnegie Mellon requests users of this software to return to
        !            55:  *
        !            56:  *  Software Distribution Coordinator  or  [email protected]
        !            57:  *  School of Computer Science
        !            58:  *  Carnegie Mellon University
        !            59:  *  Pittsburgh PA 15213-3890
        !            60:  *
        !            61:  * any improvements or extensions that they make and grant Carnegie the
        !            62:  * rights to redistribute these changes.
        !            63:  */
        !            64: 
        !            65: /*
        !            66:  *     Machine independent virtual memory parameters.
        !            67:  */
        !            68: 
        !            69: #ifndef        _VM_PARAM_
        !            70: #define        _VM_PARAM_
        !            71: 
        !            72: #ifdef KERNEL
        !            73: #include "machine/vmparam.h"
        !            74: #else
        !            75: #include <machine/vmparam.h>
        !            76: #endif
        !            77: 
        !            78: /*
        !            79:  * This belongs in types.h, but breaks too many existing programs.
        !            80:  */
        !            81: typedef int    boolean_t;
        !            82: #define        TRUE    1
        !            83: #define        FALSE   0
        !            84: 
        !            85: /*
        !            86:  *     The machine independent pages are refered to as PAGES.  A page
        !            87:  *     is some number of hardware pages, depending on the target machine.
        !            88:  */
        !            89: 
        !            90: /*
        !            91:  *     All references to the size of a page should be done with PAGE_SIZE
        !            92:  *     or PAGE_SHIFT.  The fact they are variables is hidden here so that
        !            93:  *     we can easily make them constant if we so desire.
        !            94:  */
        !            95: 
        !            96: #define        PAGE_SIZE       page_size       /* size of page in addressible units */
        !            97: #define PAGE_SHIFT     page_shift      /* number of bits to shift for pages */
        !            98: 
        !            99: /* 
        !           100:  *     Return values from the VM routines.
        !           101:  */
        !           102: #define        KERN_SUCCESS            0
        !           103: #define        KERN_INVALID_ADDRESS    1
        !           104: #define        KERN_PROTECTION_FAILURE 2
        !           105: #define        KERN_NO_SPACE           3
        !           106: #define        KERN_INVALID_ARGUMENT   4
        !           107: #define        KERN_FAILURE            5
        !           108: #define        KERN_RESOURCE_SHORTAGE  6
        !           109: #define        KERN_NOT_RECEIVER       7
        !           110: #define        KERN_NO_ACCESS          8
        !           111: 
        !           112: #ifdef ASSEMBLER
        !           113: #else  ASSEMBLER
        !           114: /*
        !           115:  *     Convert addresses to pages and vice versa.
        !           116:  *     No rounding is used.
        !           117:  */
        !           118: 
        !           119: #ifdef KERNEL
        !           120: #define        atop(x)         (((unsigned)(x)) >> page_shift)
        !           121: #define        ptoa(x)         ((vm_offset_t)((x) << page_shift))
        !           122: #endif KERNEL
        !           123: 
        !           124: /*
        !           125:  *     Round off or truncate to the nearest page.  These will work
        !           126:  *     for either addresses or counts.  (i.e. 1 byte rounds to 1 page
        !           127:  *     bytes.
        !           128:  */
        !           129: 
        !           130: #ifdef KERNEL
        !           131: #define round_page(x)  ((vm_offset_t)((((vm_offset_t)(x)) + page_mask) & ~page_mask))
        !           132: #define trunc_page(x)  ((vm_offset_t)(((vm_offset_t)(x)) & ~page_mask))
        !           133: #else  KERNEL
        !           134: #define        round_page(x)   ((((vm_offset_t)(x) + (vm_page_size - 1)) / vm_page_size) * vm_page_size)
        !           135: #define        trunc_page(x)   ((((vm_offset_t)(x)) / vm_page_size) * vm_page_size)
        !           136: #endif KERNEL
        !           137: 
        !           138: #ifdef KERNEL
        !           139: extern vm_size_t       page_size;      /* machine independent page size */
        !           140: extern vm_size_t       page_mask;      /* page_size - 1; mask for
        !           141:                                                   offset within page */
        !           142: extern int             page_shift;     /* shift to use for page size */
        !           143: 
        !           144: extern vm_size_t       mem_size;       /* size of physical memory (bytes) */
        !           145: extern vm_offset_t     first_addr;     /* first physical page */
        !           146: extern vm_offset_t     last_addr;      /* last physical page */
        !           147: #endif KERNEL
        !           148: 
        !           149: #endif ASSEMBLER
        !           150: 
        !           151: #endif _VM_PARAM_

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