sys/arch/sh3/include/param.h

   1 /*      $NetBSD: param.h,v 1.18 2007/10/17 19:57:07 garbled Exp $       */
   2
   3 /*-
   4  * Copyright (c) 2002 The NetBSD Foundation, Inc. All rights reserved.
   5  * Copyright (c) 1990 The Regents of the University of California.
   6  * All rights reserved.
   7  *
   8  * This code is derived from software contributed to Berkeley by
   9  * William Jolitz.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  *
  35  *      @(#)param.h     5.8 (Berkeley) 6/28/91
  36  */
  37
  38 /*
  39  * SuperH dependent constants.
  40  */
  41
  42 #ifndef _SH3_PARAM_H_
  43 #define _SH3_PARAM_H_
  44
  45 #if defined(_KERNEL) && !defined(_LOCORE)
  46 #include <machine/cpu.h>
  47 #endif
  48
  49 /* NetBSD/sh3 is 4KB page */
  50 #define PGSHIFT                 12
  51 #define NBPG                    (1 << PGSHIFT)
  52 #define PGOFSET                 (NBPG - 1)
  53
  54 /*
  55  * Round p (pointer or byte index) up to a correctly-aligned value
  56  * for all data types (int, long, ...).   The result is u_int and
  57  * must be cast to any desired pointer type.
  58  *
  59  * ALIGNED_POINTER is a boolean macro that checks whether an address
  60  * is valid to fetch data elements of type t from on this architecture.
  61  * This does not reflect the optimal alignment, just the possibility
  62  * (within reasonable limits).
  63  *
  64  */
  65 #define ALIGNBYTES              (sizeof(int) - 1)
  66 #define ALIGN(p)                (((u_int)(p) + ALIGNBYTES) & ~ALIGNBYTES)
  67 #define ALIGNED_POINTER(p, t)   ((((u_long)(p)) & (sizeof(t) - 1)) == 0)
  68
  69 #define DEV_BSHIFT      9               /* log2(DEV_BSIZE) */
  70 #define DEV_BSIZE       (1 << DEV_BSHIFT)
  71 #define BLKDEV_IOSIZE   2048
  72 #define MAXPHYS         (64 * 1024)     /* max raw I/O transfer size */
  73
  74 /*
  75  * u-space.
  76  */
  77 #define UPAGES          3               /* pages of u-area */
  78 #define USPACE          (UPAGES * NBPG) /* total size of u-area */
  79 #if UPAGES == 1
  80 #error "too small u-area"
  81 #elif UPAGES == 2
  82 #define P1_STACK        /* kernel stack is P1-area */
  83 #else
  84 #undef  P1_STACK        /* kernel stack is P3-area */
  85 #endif
  86
  87 #ifndef MSGBUFSIZE
  88 #define MSGBUFSIZE      NBPG            /* default message buffer size */
  89 #endif
  90
  91 /*
  92  * Constants related to network buffer management.
  93  * MCLBYTES must be no larger than NBPG (the software page size), and,
  94  * on machines that exchange pages of input or output buffers with mbuf
  95  * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
  96  * of the hardware page size.
  97  */
  98 #define MSIZE           256             /* size of an mbuf */
  99
 100 #ifndef MCLSHIFT
 101 #define MCLSHIFT        11              /* convert bytes to m_buf clusters */
 102                                         /* 2K cluster can hold Ether frame */
 103 #endif  /* MCLSHIFT */
 104
 105 #define MCLBYTES        (1 << MCLSHIFT) /* size of a m_buf cluster */
 106
 107 #ifndef NMBCLUSTERS
 108 #if defined(_KERNEL_OPT)
 109 #include "opt_gateway.h"
 110 #endif
 111
 112 #ifdef GATEWAY
 113 #define NMBCLUSTERS     512             /* map size, max cluster allocation */
 114 #else
 115 #define NMBCLUSTERS     256             /* map size, max cluster allocation */
 116 #endif
 117 #endif
 118
 119 /*
 120  * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized
 121  * logical pages.
 122  */
 123 #define NKMEMPAGES_MIN_DEFAULT  ((6 * 1024 * 1024) >> PAGE_SHIFT)
 124 #define NKMEMPAGES_MAX_DEFAULT  ((6 * 1024 * 1024) >> PAGE_SHIFT)
 125
 126 #endif /* !_SH3_PARAM_H_ */