sys/arch/vax/include/param.h

   1 /*      $NetBSD: param.h,v 1.56 2008/07/02 17:28:57 ad Exp $    */
   2 /*-
   3  * Copyright (c) 1990 The Regents of the University of California.
   4  * All rights reserved.
   5  *
   6  * This code is derived from software contributed to Berkeley by
   7  * William Jolitz.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  *      @(#)param.h     5.8 (Berkeley) 6/28/91
  34  */
  35
  36 #ifndef _VAX_PARAM_H_
  37 #define _VAX_PARAM_H_
  38
  39 /*
  40  * Machine dependent constants for VAX.
  41  */
  42
  43 #define _MACHINE        vax
  44 #define MACHINE         "vax"
  45 #define _MACHINE_ARCH   vax
  46 #define MACHINE_ARCH    "vax"
  47 #define MID_MACHINE     MID_VAX
  48
  49 /*
  50  * Round p (pointer or byte index) up to a correctly-aligned value
  51  * for all data types (int, long, ...).   The result is u_int and
  52  * must be cast to any desired pointer type.
  53  *
  54  * ALIGNED_POINTER is a boolean macro that checks whether an address
  55  * is valid to fetch data elements of type t from on this architecture.
  56  * This does not reflect the optimal alignment, just the possibility
  57  * (within reasonable limits).
  58  *
  59  */
  60
  61 #define ALIGNBYTES              (sizeof(int) - 1)
  62 #define ALIGN(p)                (((u_int)(p) + ALIGNBYTES) &~ ALIGNBYTES)
  63 #define ALIGNED_POINTER(p,t)    ((((u_long)(p)) & (sizeof(t)-1)) == 0)
  64
  65 #define PGSHIFT         12                      /* LOG2(NBPG) */
  66 #define NBPG            (1 << PGSHIFT)          /* (1 << PGSHIFT) bytes/page */
  67 #define PGOFSET         (NBPG - 1)              /* byte offset into page */
  68
  69 #define VAX_PGSHIFT     9
  70 #define VAX_NBPG        (1 << VAX_PGSHIFT)
  71 #define VAX_PGOFSET     (VAX_NBPG - 1)
  72 #define VAX_NPTEPG      (VAX_NBPG / 4)
  73
  74 #define KERNBASE        0x80000000              /* start of kernel virtual */
  75
  76 #define DEV_BSHIFT      9                              /* log2(DEV_BSIZE) */
  77 #define DEV_BSIZE       (1 << DEV_BSHIFT)
  78
  79 #define BLKDEV_IOSIZE   2048
  80 #define MAXPHYS         (64 * 1024)     /* max raw I/O transfer size */
  81 #define MAXBSIZE        0x4000          /* max FS block size - XXX */
  82
  83 #define UPAGES          2               /* pages of u-area */
  84 #define USPACE          (NBPG*UPAGES)
  85 #define REDZONEADDR     (VAX_NBPG*3)    /* Must be > sizeof(struct pcb) */
  86
  87 #ifndef MSGBUFSIZE
  88 #define MSGBUFSIZE      NBPG            /* default message buffer size */
  89 #endif
  90
  91 /*
  92  * KVA is very tight on vax, reduce the amount of KVA used by pipe
  93  * "direct" write code to reasonably low value.
  94  */
  95 #ifndef PIPE_DIRECT_CHUNK
  96 #define PIPE_DIRECT_CHUNK       65536
  97 #endif
  98
  99 /*
 100  * Constants related to network buffer management.
 101  * MCLBYTES must be no larger than NBPG (the software page size), and,
 102  * on machines that exchange pages of input or output buffers with mbuf
 103  * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
 104  * of the hardware page size.
 105  */
 106 #define MSIZE           256             /* size of an mbuf */
 107
 108 #ifndef MCLSHIFT
 109 #define MCLSHIFT        11              /* convert bytes to m_buf clusters */
 110                                         /* 2K cluster can hold Ether frame */
 111 #endif  /* MCLSHIFT */
 112
 113 #define MCLBYTES        (1 << MCLSHIFT) /* size of a m_buf cluster */
 114
 115 #ifndef NMBCLUSTERS
 116 #if defined(_KERNEL_OPT)
 117 #include "opt_gateway.h"
 118 #endif
 119
 120 #ifdef GATEWAY
 121 #define NMBCLUSTERS     512             /* map size, max cluster allocation */
 122 #else
 123 #define NMBCLUSTERS     256             /* map size, max cluster allocation */
 124 #endif
 125 #endif
 126
 127 /*
 128  * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized
 129  * logical pages.
 130  */
 131 #define NKMEMPAGES_MIN_DEFAULT  ((4 * 1024 * 1024) >> PAGE_SHIFT)
 132 #define NKMEMPAGES_MAX_DEFAULT  ((4 * 1024 * 1024) >> PAGE_SHIFT)
 133
 134 /*
 135  * Some macros for units conversion
 136  */
 137
 138 #define btop(x)         ((x) >> PGSHIFT)
 139
 140 /* MD conversion macros */
 141 #define vax_btoc(x)     (((unsigned)(x) + VAX_PGOFSET) >> VAX_PGSHIFT)
 142 #define vax_btop(x)     (((unsigned)(x)) >> VAX_PGSHIFT)
 143
 144 #ifdef _KERNEL
 145 #include <machine/intr.h>
 146
 147 /* Prototype needed for delay() */
 148 #ifndef _LOCORE
 149 void    delay(int);
 150 /* inline macros used inside kernel */
 151 #include <machine/macros.h>
 152 #endif
 153
 154 #define DELAY(x) delay(x)
 155 #define MAXEXEC 1
 156 #endif /* _KERNEL */
 157
 158 #endif /* _VAX_PARAM_H_ */