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Annotation of 43BSDReno/sys/tahoe/machparam.h, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1982, 1986, 1988 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 7.6 (Berkeley) 5/10/90
                      7:  */
                      8: 
                      9: /*
                     10:  * Machine dependent constants for TAHOE.
                     11:  */
                     12: #define        MACHINE "tahoe"
                     13: 
                     14: #ifndef BYTE_ORDER
                     15: #include <machine/endian.h>
                     16: #endif
                     17: 
                     18: #include <machine/machlimits.h>
                     19: 
                     20: /*
                     21:  * Round p (pointer or byte index) up to a correctly-aligned value
                     22:  * for all data types (int, long, ...).   The result is u_int and
                     23:  * must be cast to any desired pointer type.
                     24:  */
                     25: #define        ALIGN(p)        (((u_int)(p) + (sizeof(int) - 1)) &~ (sizeof(int) - 1))
                     26: 
                     27: #define        NBPG            1024            /* bytes/page */
                     28: #define        PGOFSET         (NBPG-1)        /* byte offset into page */
                     29: #define        PGSHIFT         10              /* LOG2(NBPG) */
                     30: #define        NPTEPG          (NBPG/(sizeof (struct pte)))
                     31: 
                     32: #define        KERNBASE        0xc0000000      /* start of kernel virtual */
                     33: #define        KERNTEXTOFF     (KERNBASE + 0x800)      /* start of kernel text */
                     34: #define        BTOPKERNBASE    ((u_long)KERNBASE >> PGSHIFT)
                     35: 
                     36: #define        DEV_BSIZE       1024
                     37: #define        DEV_BSHIFT      10              /* log2(DEV_BSIZE) */
                     38: #define BLKDEV_IOSIZE  1024            /* NBPG for physical controllers */
                     39: #define        MAXPHYS         (64 * 1024)     /* max raw I/O transfer size */
                     40: 
                     41: #define        CLSIZE          1
                     42: #define        CLSIZELOG2      0
                     43: 
                     44: #define        SSIZE           2               /* initial stack size/NBPG */
                     45: #define        SINCR           2               /* increment of stack/NBPG */
                     46: #define        UPAGES          8               /* pages of u-area (2 stack pages) */
                     47: 
                     48: /*
                     49:  * Constants related to network buffer management.
                     50:  * MCLBYTES must be no larger than CLBYTES (the software page size), and,
                     51:  * on machines that exchange pages of input or output buffers with mbuf
                     52:  * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
                     53:  * of the hardware page size.
                     54:  */
                     55: #define        MSIZE           128             /* size of an mbuf */
                     56: #define        MAPPED_MBUFS                    /* can do scatter-gather I/O */
                     57: #if CLBYTES > 1024
                     58: #define        MCLBYTES        1024
                     59: #define        MCLSHIFT        10
                     60: #define        MCLOFSET        (MCLBYTES - 1)
                     61: #else
                     62: #define        MCLBYTES        CLBYTES
                     63: #define        MCLSHIFT        CLSHIFT
                     64: #define        MCLOFSET        CLOFSET
                     65: #endif
                     66: #ifdef GATEWAY
                     67: #define        NMBCLUSTERS     512             /* map size, max cluster allocation */
                     68: #else
                     69: #define        NMBCLUSTERS     256             /* map size, max cluster allocation */
                     70: #endif
                     71: 
                     72: #define        MAXCKEY 255             /* maximal allowed code key */
                     73: #define        MAXDKEY 255             /* maximal allowed data key */
                     74: #define        NCKEY   (MAXCKEY+1)     /* # code keys, including 0 (reserved) */
                     75: #define        NDKEY   (MAXDKEY+1)     /* # data keys, including 0 (reserved) */
                     76: 
                     77: /*
                     78:  * Size of kernel malloc arena in CLBYTES-sized logical pages
                     79:  */ 
                     80: #ifndef NKMEMCLUSTERS
                     81: #define        NKMEMCLUSTERS   (512*1024/CLBYTES)
                     82: #endif
                     83: 
                     84: /*
                     85:  * Some macros for units conversion
                     86:  */
                     87: /* Core clicks (1024 bytes) to segments and vice versa */
                     88: #define        ctos(x) (x)
                     89: #define        stoc(x) (x)
                     90: 
                     91: /* Core clicks (1024 bytes) to disk blocks */
                     92: #define        ctod(x) (x)
                     93: #define        dtoc(x) (x)
                     94: #define        dtob(x) ((x)<<PGSHIFT)
                     95: 
                     96: /* clicks to bytes */
                     97: #define        ctob(x) ((x)<<PGSHIFT)
                     98: 
                     99: /* bytes to clicks */
                    100: #define        btoc(x) ((((unsigned)(x)+NBPG-1) >> PGSHIFT))
                    101: 
                    102: #define        btodb(bytes)                    /* calculates (bytes / DEV_BSIZE) */ \
                    103:        ((unsigned)(bytes) >> DEV_BSHIFT)
                    104: #define        dbtob(db)                       /* calculates (db * DEV_BSIZE) */ \
                    105:        ((unsigned)(db) << DEV_BSHIFT)
                    106: 
                    107: /*
                    108:  * Map a ``block device block'' to a file system block.
                    109:  * This should be device dependent, and will be if we
                    110:  * add an entry to cdevsw/bdevsw for that purpose.
                    111:  * For now though just use DEV_BSIZE.
                    112:  */
                    113: #define        bdbtofsb(bn)    ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE))
                    114: 
                    115: /*
                    116:  * Macros to decode processor status word.
                    117:  */
                    118: #define        USERMODE(ps)    (((ps) & PSL_CURMOD) == PSL_CURMOD)
                    119: #define        BASEPRI(ps)     (((ps) & PSL_IPL) == 0)
                    120: 
                    121: #define        DELAY(n)        { register int N = 3*(n); while (--N > 0); }

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