sys/arch/i386/include/param.h

   1 /*      $NetBSD: param.h,v 1.70 2008/12/20 13:07:36 ad Exp $    */
   2
   3 /*-
   4  * Copyright (c) 1990 The Regents of the University of California.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * William Jolitz.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  *      @(#)param.h     5.8 (Berkeley) 6/28/91
  35  */
  36
  37 #ifndef _I386_PARAM_H_
  38 #define _I386_PARAM_H_
  39
  40 /*
  41  * Machine dependent constants for Intel 386.
  42  */
  43
  44 #ifdef _KERNEL
  45 #include <machine/cpu.h>
  46 #endif
  47
  48 #define _MACHINE        i386
  49 #define MACHINE         "i386"
  50 #define _MACHINE_ARCH   i386
  51 #define MACHINE_ARCH    "i386"
  52 #define MID_MACHINE     MID_I386
  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)(u_long)(p) + ALIGNBYTES) &~ \
  67     ALIGNBYTES)
  68 #define ALIGNED_POINTER(p,t)    1
  69
  70 #define PGSHIFT         12              /* LOG2(NBPG) */
  71 #define NBPG            (1 << PGSHIFT)  /* bytes/page */
  72 #define PGOFSET         (NBPG-1)        /* byte offset into page */
  73 #define NPTEPG          (NBPG/(sizeof (pt_entry_t)))
  74
  75 #if defined(_KERNEL_OPT)
  76 #include "opt_kernbase.h"
  77 #endif /* defined(_KERNEL_OPT) */
  78
  79 #ifdef KERNBASE_LOCORE
  80 #error "You should only re-define KERNBASE"
  81 #endif
  82
  83 #ifndef KERNBASE
  84 #define KERNBASE        0xc0000000UL    /* start of kernel virtual space */
  85 #endif
  86
  87 #define KERNTEXTOFF     (KERNBASE + 0x100000) /* start of kernel text */
  88 #define BTOPKERNBASE    (KERNBASE >> PGSHIFT)
  89
  90 #define DEV_BSHIFT      9               /* log2(DEV_BSIZE) */
  91 #define DEV_BSIZE       (1 << DEV_BSHIFT)
  92 #define BLKDEV_IOSIZE   2048
  93 #ifndef MAXPHYS
  94 #define MAXPHYS         (64 * 1024)     /* max raw I/O transfer size */
  95 #endif
  96
  97 #define SSIZE           1               /* initial stack size/NBPG */
  98 #define SINCR           1               /* increment of stack/NBPG */
  99
 100 #ifndef UPAGES
 101 # ifdef DIAGNOSTIC
 102 #  define       UPAGES          3       /* 2 + 1 page for redzone */
 103 # else
 104 #  define       UPAGES          2       /* normal pages of u-area */
 105 # endif /* DIAGNOSTIC */
 106 #endif /* !defined(UPAGES) */
 107 #define USPACE          (UPAGES * NBPG) /* total size of u-area */
 108 #define INTRSTACKSIZE   8192
 109
 110 #ifndef MSGBUFSIZE
 111 #define MSGBUFSIZE      8*NBPG          /* default message buffer size */
 112 #endif
 113
 114 /*
 115  * Constants related to network buffer management.
 116  * MCLBYTES must be no larger than NBPG (the software page size), and,
 117  * on machines that exchange pages of input or output buffers with mbuf
 118  * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
 119  * of the hardware page size.
 120  */
 121 #define MSIZE           256             /* size of an mbuf */
 122
 123 #ifndef MCLSHIFT
 124 #define MCLSHIFT        11              /* convert bytes to m_buf clusters */
 125                                         /* 2K cluster can hold Ether frame */
 126 #endif  /* MCLSHIFT */
 127
 128 #define MCLBYTES        (1 << MCLSHIFT) /* size of a m_buf cluster */
 129
 130 #ifndef NMBCLUSTERS
 131 #if defined(_KERNEL_OPT)
 132 #include "opt_gateway.h"
 133 #endif
 134
 135 #ifdef GATEWAY
 136 #define NMBCLUSTERS     2048            /* map size, max cluster allocation */
 137 #else
 138 #define NMBCLUSTERS     1024            /* map size, max cluster allocation */
 139 #endif
 140 #endif
 141
 142 #ifndef NFS_RSIZE
 143 #define NFS_RSIZE       32768
 144 #endif
 145 #ifndef NFS_WSIZE
 146 #define NFS_WSIZE       32768
 147 #endif
 148
 149 /*
 150  * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized
 151  * logical pages.
 152  */
 153 #define NKMEMPAGES_MIN_DEFAULT  ((8 * 1024 * 1024) >> PAGE_SHIFT)
 154 #define NKMEMPAGES_MAX_DEFAULT  ((128 * 1024 * 1024) >> PAGE_SHIFT)
 155
 156 /*
 157  * Mach derived conversion macros
 158  */
 159 #define x86_round_pdr(x) \
 160         ((((unsigned long)(x)) + (NBPD_L2 - 1)) & ~(NBPD_L2 - 1))
 161 #define x86_trunc_pdr(x)        ((unsigned long)(x) & ~(NBPD_L2 - 1))
 162 #define x86_btod(x)             ((unsigned long)(x) >> L2_SHIFT)
 163 #define x86_dtob(x)             ((unsigned long)(x) << L2_SHIFT)
 164 #define x86_round_page(x)       ((((paddr_t)(x)) + PGOFSET) & ~PGOFSET)
 165 #define x86_trunc_page(x)       ((paddr_t)(x) & ~PGOFSET)
 166 #define x86_btop(x)             ((paddr_t)(x) >> PGSHIFT)
 167 #define x86_ptob(x)             ((paddr_t)(x) << PGSHIFT)
 168
 169 #endif /* _I386_PARAM_H_ */