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Annotation of researchv9/sys/sun3/param.h, revision 1.1

1.1     ! root        1: /*      @(#)param.h 1.1 86/02/03 SMI      */
        !             2: 
        !             3: /*
        !             4:  * Copyright (c) 1985 by Sun Microsystems, Inc.
        !             5:  *
        !             6:  * This file is intended to contain the
        !             7:  * specific details of a given architecture.
        !             8:  */
        !             9: 
        !            10: /*
        !            11:  * Machine dependent constants for Sun-3.
        !            12:  */
        !            13: #define        NBPG    8192            /* bytes/page */
        !            14: #define        PGOFSET (NBPG-1)        /* byte offset into page */
        !            15: #define        PGSHIFT 13              /* LOG2(NBPG) */
        !            16: 
        !            17: #define        NBSG    131072          /* bytes/segment */
        !            18: #define        SGOFSET (NBSG-1)        /* byte offset into segment */
        !            19: #define        SGSHIFT 17              /* LOG2(NBSG) */
        !            20: 
        !            21: #define        CLSIZE          1
        !            22: #define        CLSIZELOG2      0
        !            23: 
        !            24: #define        SSIZE           1       /* initial stack size/NBPG */
        !            25: #define        SINCR           1       /* increment of stack/NBPG */
        !            26: 
        !            27: /*
        !            28:  * Define UADDR as a 32 bit address so that the compiler will
        !            29:  * generate short absolute references to access the u-area.
        !            30:  */
        !            31: #define        UADDR           (0-4*NBPG) /* u-area virtual address - 4th page down */
        !            32: #define        UPAGES          1       /* pages of u-area, NOT including red zone */
        !            33: 
        !            34: #define        KERNSTACK       0x800   /* size of kernel stack in u-area */
        !            35: 
        !            36: /*
        !            37:  * KERNELBASE is the virtual address which
        !            38:  * the kernel mapping starts in all contexts.
        !            39:  */
        !            40: #define        KERNELBASE      0x0F000000
        !            41: 
        !            42: /*
        !            43:  * Some macros for units conversion
        !            44:  */
        !            45: /* Core clicks (8192 bytes) to segments and vice versa */
        !            46: #define        ctos(x) (((x)+15)>>(SGSHIFT-PGSHIFT))
        !            47: #define        stoc(x) ((x)<<(SGSHIFT-PGSHIFT))
        !            48: 
        !            49: /* Page number to segment number */
        !            50: #define        ptos(x) ((x)>>(SGSHIFT-PGSHIFT))
        !            51: 
        !            52: /* Core clicks (8192 bytes) to disk blocks and vice versa */
        !            53: #define        ctod(x) ((x)<<4)
        !            54: #define        dtoc(x) (((x)+15)>>4)
        !            55: #define        dtob(x) ((x)<<9)
        !            56: 
        !            57: /* clicks to bytes */
        !            58: #define        ctob(x) ((x)<<PGSHIFT)
        !            59: 
        !            60: /* bytes to clicks */
        !            61: #define        btoc(x) ((((unsigned)(x)+(NBPG-1))>>PGSHIFT))
        !            62: 
        !            63: /*
        !            64:  * Macros to decode processor status word.
        !            65:  */
        !            66: #define        USERMODE(ps)    (((ps) & SR_SMODE) == 0)
        !            67: #define        BASEPRI(ps)     (((ps) & SR_INTPRI) == 0)
        !            68: 
        !            69: /*
        !            70:  * Delay units are in microseconds.
        !            71:  */
        !            72: #define        DELAY(n)        \
        !            73: { \
        !            74:        extern int cpudelay; \
        !            75:        register int N = (((n)<<4) >> cpudelay); \
        !            76:  \
        !            77:        while (--N > 0) ; \
        !            78: }
        !            79: 
        !            80: #define        CDELAY(c, n)    \
        !            81: { \
        !            82:        extern int cpudelay; \
        !            83:        register int N = (((n)<<3) >> cpudelay); \
        !            84:  \
        !            85:        while (--N > 0) \
        !            86:                if (c) \
        !            87:                        break; \
        !            88: }

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