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Annotation of XNU/bsd/i386/param.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /*-
        !            23:  * Copyright (c) 1990, 1993
        !            24:  *     The Regents of the University of California.  All rights reserved.
        !            25:  * (c) UNIX System Laboratories, Inc.
        !            26:  * All or some portions of this file are derived from material licensed
        !            27:  * to the University of California by American Telephone and Telegraph
        !            28:  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
        !            29:  * the permission of UNIX System Laboratories, Inc.
        !            30:  *
        !            31:  * Redistribution and use in source and binary forms, with or without
        !            32:  * modification, are permitted provided that the following conditions
        !            33:  * are met:
        !            34:  * 1. Redistributions of source code must retain the above copyright
        !            35:  *    notice, this list of conditions and the following disclaimer.
        !            36:  * 2. Redistributions in binary form must reproduce the above copyright
        !            37:  *    notice, this list of conditions and the following disclaimer in the
        !            38:  *    documentation and/or other materials provided with the distribution.
        !            39:  * 3. All advertising materials mentioning features or use of this software
        !            40:  *    must display the following acknowledgement:
        !            41:  *     This product includes software developed by the University of
        !            42:  *     California, Berkeley and its contributors.
        !            43:  * 4. Neither the name of the University nor the names of its contributors
        !            44:  *    may be used to endorse or promote products derived from this software
        !            45:  *    without specific prior written permission.
        !            46:  *
        !            47:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            48:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            49:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            50:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            51:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            52:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            53:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            54:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            55:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            56:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            57:  * SUCH DAMAGE.
        !            58:  *
        !            59:  *     @(#)param.h     8.1 (Berkeley) 4/4/95
        !            60:  */
        !            61: 
        !            62: /*
        !            63:  * Machine dependent constants for Intel 386.
        !            64:  */
        !            65: 
        !            66: #ifndef _I386_PARAM_H_
        !            67: #define _I386_PARAM_H_
        !            68: 
        !            69: /*
        !            70:  * Round p (pointer or byte index) up to a correctly-aligned value for all
        !            71:  * data types (int, long, ...).   The result is u_int and must be cast to
        !            72:  * any desired pointer type.
        !            73:  */
        !            74: #define        ALIGNBYTES      3
        !            75: #define        ALIGN(p)        (((u_int)(p) + ALIGNBYTES) &~ ALIGNBYTES)
        !            76: 
        !            77: #define        NBPG            4096            /* bytes/page */
        !            78: #define        PGOFSET         (NBPG-1)        /* byte offset into page */
        !            79: #define        PGSHIFT         12              /* LOG2(NBPG) */
        !            80: 
        !            81: #define        DEV_BSIZE       512
        !            82: #define        DEV_BSHIFT      9               /* log2(DEV_BSIZE) */
        !            83: #define BLKDEV_IOSIZE  2048
        !            84: #define        MAXPHYS         (64 * 1024)     /* max raw I/O transfer size */
        !            85: 
        !            86: #define        STACK_GROWS_UP  0               /* stack grows to lower addresses */
        !            87: 
        !            88: #define        CLSIZE          1
        !            89: #define        CLSIZELOG2      0
        !            90: 
        !            91: /*
        !            92:  * Constants related to network buffer management.
        !            93:  * MCLBYTES must be no larger than CLBYTES (the software page size), and,
        !            94:  * on machines that exchange pages of input or output buffers with mbuf
        !            95:  * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
        !            96:  * of the hardware page size.
        !            97:  */
        !            98: #define        MSIZE           128             /* size of an mbuf */
        !            99: #define        MCLBYTES        2048            /* large enough for ether MTU */
        !           100: #define        MCLSHIFT        11
        !           101: #define        MCLOFSET        (MCLBYTES - 1)
        !           102: #ifndef NMBCLUSTERS
        !           103: #ifdef GATEWAY
        !           104: #define        NMBCLUSTERS     ((1024 * 1024) / MCLBYTES)      /* cl map size: 1MB */
        !           105: #else
        !           106: #define        NMBCLUSTERS     ((1024 * 512) / MCLBYTES)       /* cl map size: 0.5MB */
        !           107: #endif
        !           108: #endif
        !           109: 
        !           110: /*
        !           111:  * Some macros for units conversion
        !           112:  */
        !           113: /* Core clicks (NeXT_page_size bytes) to segments and vice versa */
        !           114: #define        ctos(x) (x)
        !           115: #define        stoc(x) (x)
        !           116: 
        !           117: /* Core clicks (4096 bytes) to disk blocks */
        !           118: #define        ctod(x) ((x)<<(PGSHIFT-DEV_BSHIFT))
        !           119: #define        dtoc(x) ((x)>>(PGSHIFT-DEV_BSHIFT))
        !           120: #define        dtob(x) ((x)<<DEV_BSHIFT)
        !           121: 
        !           122: /* clicks to bytes */
        !           123: #define        ctob(x) ((x)<<PGSHIFT)
        !           124: 
        !           125: /* bytes to clicks */
        !           126: #define        btoc(x) (((unsigned)(x)+(NBPG-1))>>PGSHIFT)
        !           127: 
        !           128: #ifdef __APPLE__
        !           129: #define  btodb(bytes, devBlockSize)         \
        !           130:         ((unsigned)(bytes) / devBlockSize)
        !           131: #define  dbtob(db, devBlockSize)            \
        !           132:         ((unsigned)(db) * devBlockSize)
        !           133: #else
        !           134: #define        btodb(bytes)                    /* calculates (bytes / DEV_BSIZE) */ \
        !           135:        ((unsigned)(bytes) >> DEV_BSHIFT)
        !           136: #define        dbtob(db)                       /* calculates (db * DEV_BSIZE) */ \
        !           137:        ((unsigned)(db) << DEV_BSHIFT)
        !           138: #endif
        !           139: 
        !           140: /*
        !           141:  * Map a ``block device block'' to a file system block.
        !           142:  * This should be device dependent, and will be if we
        !           143:  * add an entry to cdevsw/bdevsw for that purpose.
        !           144:  * For now though just use DEV_BSIZE.
        !           145:  */
        !           146: #define        bdbtofsb(bn)    ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE))
        !           147: 
        !           148: /*
        !           149:  * Macros to decode (and encode) processor status word.
        !           150:  */
        !           151: #define STATUS_WORD(rpl, ipl)  (((ipl) << 8) | (rpl))
        !           152: #define        USERMODE(x)             (((x) & 3) == 3)
        !           153: #define        BASEPRI(x)              (((x) & (255 << 8)) == 0)
        !           154: 
        !           155: 
        !           156: #if    defined(KERNEL) || defined(STANDALONE)
        !           157: #define        DELAY(n) delay(n)
        !           158: 
        !           159: #else  /* defined(KERNEL) || defined(STANDALONE) */
        !           160: #define        DELAY(n)        { register int N = (n); while (--N > 0); }
        !           161: #endif /* defined(KERNEL) || defined(STANDALONE) */
        !           162: 
        !           163: #endif /* _I386_PARAM_H_ */

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