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Annotation of Net2/arch/i386/include/param.h, revision 1.1

1.1     ! root        1: /*-
        !             2:  * Copyright (c) 1990 The Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * This code is derived from software contributed to Berkeley by
        !             6:  * William Jolitz.
        !             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:  *     @(#)param.h     5.8 (Berkeley) 6/28/91
        !            37:  */
        !            38: 
        !            39: /*
        !            40:  * Machine dependent constants for Intel 386.
        !            41:  */
        !            42: 
        !            43: #define MACHINE "i386"
        !            44: 
        !            45: /*
        !            46:  * Round p (pointer or byte index) up to a correctly-aligned value
        !            47:  * for all data types (int, long, ...).   The result is u_int and
        !            48:  * must be cast to any desired pointer type.
        !            49:  */
        !            50: #define        ALIGN(p)        (((u_int)(p) + (sizeof(int) - 1)) &~ (sizeof(int) - 1))
        !            51: 
        !            52: #define        NBPG            4096            /* bytes/page */
        !            53: #define        PGOFSET         (NBPG-1)        /* byte offset into page */
        !            54: #define        PGSHIFT         12              /* LOG2(NBPG) */
        !            55: #define        NPTEPG          (NBPG/(sizeof (struct pte)))
        !            56: 
        !            57: #define NBPDR          (1024*NBPG)     /* bytes/page dir */
        !            58: #define        PDROFSET        (NBPDR-1)       /* byte offset into page dir */
        !            59: #define        PDRSHIFT        22              /* LOG2(NBPDR) */
        !            60: 
        !            61: #define        KERNBASE        0xFE000000      /* start of kernel virtual */
        !            62: #define        BTOPKERNBASE    ((u_long)KERNBASE >> PGSHIFT)
        !            63: 
        !            64: #define        DEV_BSIZE       512
        !            65: #define        DEV_BSHIFT      9               /* log2(DEV_BSIZE) */
        !            66: #define BLKDEV_IOSIZE  2048
        !            67: #define        MAXPHYS         (64 * 1024)     /* max raw I/O transfer size */
        !            68: 
        !            69: #define        CLSIZE          1
        !            70: #define        CLSIZELOG2      0
        !            71: 
        !            72: /* NOTE: SSIZE, SINCR and UPAGES must be multiples of CLSIZE */
        !            73: #define        SSIZE   1               /* initial stack size/NBPG */
        !            74: #define        SINCR   1               /* increment of stack/NBPG */
        !            75: 
        !            76: #define        UPAGES  2               /* pages of u-area */
        !            77: 
        !            78: /*
        !            79:  * Constants related to network buffer management.
        !            80:  * MCLBYTES must be no larger than CLBYTES (the software page size), and,
        !            81:  * on machines that exchange pages of input or output buffers with mbuf
        !            82:  * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
        !            83:  * of the hardware page size.
        !            84:  */
        !            85: #define        MSIZE           128             /* size of an mbuf */
        !            86: #define        MCLBYTES        1024
        !            87: #define        MCLSHIFT        10
        !            88: #define        MCLOFSET        (MCLBYTES - 1)
        !            89: #ifndef NMBCLUSTERS
        !            90: #ifdef GATEWAY
        !            91: #define        NMBCLUSTERS     512             /* map size, max cluster allocation */
        !            92: #else
        !            93: #define        NMBCLUSTERS     256             /* map size, max cluster allocation */
        !            94: #endif
        !            95: #endif
        !            96: 
        !            97: /*
        !            98:  * Size of kernel malloc arena in CLBYTES-sized logical pages
        !            99:  */ 
        !           100: #ifndef NKMEMCLUSTERS
        !           101: #define        NKMEMCLUSTERS   (2048*1024/CLBYTES)
        !           102: #endif
        !           103: /*
        !           104:  * Some macros for units conversion
        !           105:  */
        !           106: /* Core clicks (4096 bytes) to segments and vice versa */
        !           107: #define        ctos(x) (x)
        !           108: #define        stoc(x) (x)
        !           109: 
        !           110: /* Core clicks (4096 bytes) to disk blocks */
        !           111: #define        ctod(x) ((x)<<(PGSHIFT-DEV_BSHIFT))
        !           112: #define        dtoc(x) ((x)>>(PGSHIFT-DEV_BSHIFT))
        !           113: #define        dtob(x) ((x)<<DEV_BSHIFT)
        !           114: 
        !           115: /* clicks to bytes */
        !           116: #define        ctob(x) ((x)<<PGSHIFT)
        !           117: 
        !           118: /* bytes to clicks */
        !           119: #define        btoc(x) (((unsigned)(x)+(NBPG-1))>>PGSHIFT)
        !           120: 
        !           121: #define        btodb(bytes)                    /* calculates (bytes / DEV_BSIZE) */ \
        !           122:        ((unsigned)(bytes) >> DEV_BSHIFT)
        !           123: #define        dbtob(db)                       /* calculates (db * DEV_BSIZE) */ \
        !           124:        ((unsigned)(db) << DEV_BSHIFT)
        !           125: 
        !           126: /*
        !           127:  * Map a ``block device block'' to a file system block.
        !           128:  * This should be device dependent, and will be if we
        !           129:  * add an entry to cdevsw/bdevsw for that purpose.
        !           130:  * For now though just use DEV_BSIZE.
        !           131:  */
        !           132: #define        bdbtofsb(bn)    ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE))
        !           133: 
        !           134: /*
        !           135:  * Mach derived conversion macros
        !           136:  */
        !           137: #define i386_round_pdr(x)      ((((unsigned)(x)) + NBPDR - 1) & ~(NBPDR-1))
        !           138: #define i386_trunc_pdr(x)      ((unsigned)(x) & ~(NBPDR-1))
        !           139: #define i386_round_page(x)     ((((unsigned)(x)) + NBPG - 1) & ~(NBPG-1))
        !           140: #define i386_trunc_page(x)     ((unsigned)(x) & ~(NBPG-1))
        !           141: #define i386_btod(x)           ((unsigned)(x) >> PDRSHIFT)
        !           142: #define i386_dtob(x)           ((unsigned)(x) << PDRSHIFT)
        !           143: #define i386_btop(x)           ((unsigned)(x) >> PGSHIFT)
        !           144: #define i386_ptob(x)           ((unsigned)(x) << PGSHIFT)
        !           145: 
        !           146: #ifdef KERNEL
        !           147: #ifndef LOCORE
        !           148: int    cpuspeed;
        !           149: #endif
        !           150: #define        DELAY(n)        { register int N = cpuspeed * (n); while (--N > 0); }
        !           151: 
        !           152: #else
        !           153: #define        DELAY(n)        { register int N = (n); while (--N > 0); }
        !           154: #endif

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