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Annotation of researchv9/sys/sun3/param.h, revision 1.1.1.1

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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