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Annotation of 43BSDTahoe/sys/vax/machparam.h, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1982, 1986 Regents of the University of California.
                      3:  * All rights reserved.  The Berkeley software License Agreement
                      4:  * specifies the terms and conditions for redistribution.
                      5:  *
                      6:  *     @(#)machparam.h 7.10 (Berkeley) 1/21/88
                      7:  */
                      8: 
                      9: /*
                     10:  * Machine dependent constants for VAX.
                     11:  */
                     12: #define        MACHINE "vax"
                     13: 
                     14: #ifndef BYTE_ORDER
                     15: #include <machine/endian.h>
                     16: #endif
                     17: 
                     18: #define        CHAR_BIT        NBBY
                     19: #define        CHAR_MAX        0x7f
                     20: #define        CHAR_MIN        0x80
                     21: #define        CLK_TCK         60                      /* for times() */
                     22: #define        INT_MAX         0x7fffffff
                     23: #define        INT_MIN         0x80000000
                     24: #define        LONG_MAX        0x7fffffff
                     25: #define        LONG_MIN        0x80000000
                     26: #define        SCHAR_MAX       0x7f
                     27: #define        SCHAR_MIN       0x80
                     28: #define        SHRT_MAX        0x7fff
                     29: #define        SHRT_MIN        0x8000
                     30: #define        UCHAR_MAX       0xff
                     31: #define        UINT_MAX        0xffffffff
                     32: #define        ULONG_MAX       0xffffffff
                     33: #define        USHRT_MAX       0xffff
                     34: 
                     35: #define        NBPG            512             /* bytes/page */
                     36: #define        PGOFSET         (NBPG-1)        /* byte offset into page */
                     37: #define        PGSHIFT         9               /* LOG2(NBPG) */
                     38: #define        NPTEPG          (NBPG/(sizeof (struct pte)))
                     39: 
                     40: #define        KERNBASE        0x80000000      /* start of kernel virtual */
                     41: #define        BTOPKERNBASE    ((u_long)KERNBASE >> PGSHIFT)
                     42: 
                     43: #define        DEV_BSIZE       512
                     44: #define        DEV_BSHIFT      9               /* log2(DEV_BSIZE) */
                     45: #define BLKDEV_IOSIZE  2048
                     46: #define        MAXPHYS         (63 * 1024)     /* max raw I/O transfer size */
                     47: 
                     48: #define        CLSIZE          2
                     49: #define        CLSIZELOG2      1
                     50: 
                     51: #define        SSIZE           4               /* initial stack size/NBPG */
                     52: #define        SINCR           4               /* increment of stack/NBPG */
                     53: 
                     54: #define        UPAGES          10              /* pages of u-area */
                     55: 
                     56: /*
                     57:  * Some macros for units conversion
                     58:  */
                     59: /* Core clicks (512 bytes) to segments and vice versa */
                     60: #define        ctos(x) (x)
                     61: #define        stoc(x) (x)
                     62: 
                     63: /* Core clicks (512 bytes) to disk blocks */
                     64: #define        ctod(x) (x)
                     65: #define        dtoc(x) (x)
                     66: #define        dtob(x) ((x)<<PGSHIFT)
                     67: 
                     68: /* clicks to bytes */
                     69: #define        ctob(x) ((x)<<9)
                     70: 
                     71: /* bytes to clicks */
                     72: #define        btoc(x) ((((unsigned)(x)+511)>>9))
                     73: 
                     74: #define        btodb(bytes)                    /* calculates (bytes / DEV_BSIZE) */ \
                     75:        ((unsigned)(bytes) >> DEV_BSHIFT)
                     76: #define        dbtob(db)                       /* calculates (db * DEV_BSIZE) */ \
                     77:        ((unsigned)(db) << DEV_BSHIFT)
                     78: 
                     79: /*
                     80:  * Map a ``block device block'' to a file system block.
                     81:  * This should be device dependent, and will be if we
                     82:  * add an entry to cdevsw/bdevsw for that purpose.
                     83:  * For now though just use DEV_BSIZE.
                     84:  */
                     85: #define        bdbtofsb(bn)    ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE))
                     86: 
                     87: /*
                     88:  * Macros to decode processor status word.
                     89:  */
                     90: #define        USERMODE(ps)    (((ps) & PSL_CURMOD) == PSL_CURMOD)
                     91: #define        BASEPRI(ps)     (((ps) & PSL_IPL) == 0)
                     92: 
                     93: #ifdef KERNEL
                     94: #ifndef LOCORE
                     95: int    cpuspeed;
                     96: #define        DELAY(n)        { register int N = cpuspeed * (n); while (--N > 0); }
                     97: #endif
                     98: 
                     99: #else KERNEL
                    100: #define        DELAY(n)        { register int N = (n); while (--N > 0); }
                    101: #endif KERNEL

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