StdLib/Include/Ia32/machine/param.h

   1 /*      $NetBSD: param.h,v 1.61 2006/08/28 13:43:35 yamt 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 #ifdef _LOCORE
  46 #include <machine/psl.h>
  47 #else
  48 #include <machine/cpu.h>
  49 #endif
  50 #endif
  51
  52 #define _MACHINE        i386
  53 #define MACHINE         "i386"
  54 #define _MACHINE_ARCH   i386
  55 #define MACHINE_ARCH    "i386"
  56 #define MID_MACHINE     MID_I386
  57
  58 /*
  59  * Round p (pointer or byte index) up to a correctly-aligned value
  60  * for all data types (int, long, ...).   The result is u_int and
  61  * must be cast to any desired pointer type.
  62  *
  63  * ALIGNED_POINTER is a boolean macro that checks whether an address
  64  * is valid to fetch data elements of type t from on this architecture.
  65  * This does not reflect the optimal alignment, just the possibility
  66  * (within reasonable limits).
  67  *
  68  */
  69 #define ALIGNBYTES              (sizeof(int) - 1)
  70 #define ALIGN(p)                (((u_int)(u_long)(p) + ALIGNBYTES) &~ \
  71     ALIGNBYTES)
  72 #define ALIGNED_POINTER(p,t)    1
  73
  74 #define PGSHIFT         12              /* LOG2(NBPG) */
  75 #define NBPG            (1 << PGSHIFT)  /* bytes/page */
  76 #define PGOFSET         (NBPG-1)        /* byte offset into page */
  77 #define NPTEPG          (NBPG/(sizeof (pt_entry_t)))
  78
  79 #if defined(_KERNEL_OPT)
  80 #include "opt_kernbase.h"
  81 #endif /* defined(_KERNEL_OPT) */
  82
  83 #ifdef KERNBASE_LOCORE
  84 #error "You should only re-define KERNBASE"
  85 #endif
  86
  87 #ifndef KERNBASE
  88 #define KERNBASE        0xc0000000UL    /* start of kernel virtual space */
  89 #endif
  90
  91 #define KERNTEXTOFF     (KERNBASE + 0x100000) /* start of kernel text */
  92 #define BTOPKERNBASE    (KERNBASE >> PGSHIFT)
  93
  94 #define DEV_BSHIFT      9               /* log2(DEV_BSIZE) */
  95 #define DEV_BSIZE       (1 << DEV_BSHIFT)
  96 #define BLKDEV_IOSIZE   2048
  97 #ifndef MAXPHYS
  98 #define MAXPHYS         (64 * 1024)     /* max raw I/O transfer size */
  99 #endif
 100
 101 #define SSIZE           1               /* initial stack size/NBPG */
 102 #define SINCR           1               /* increment of stack/NBPG */
 103
 104 #ifdef _KERNEL_OPT
 105 #include "opt_noredzone.h"
 106 #endif
 107 #ifndef UPAGES
 108 #ifdef NOREDZONE
 109 #define UPAGES          2               /* pages of u-area */
 110 #else
 111 #define UPAGES          3
 112 #endif /*NOREDZONE */
 113 #endif /* !defined(UPAGES) */
 114 #define USPACE          (UPAGES * NBPG) /* total size of u-area */
 115
 116 #ifndef MSGBUFSIZE
 117 #define MSGBUFSIZE      4*NBPG          /* default message buffer size */
 118 #endif
 119
 120 /*
 121  * Constants related to network buffer management.
 122  * MCLBYTES must be no larger than NBPG (the software page size), and,
 123  * on machines that exchange pages of input or output buffers with mbuf
 124  * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
 125  * of the hardware page size.
 126  */
 127 #define MSIZE           256             /* size of an mbuf */
 128
 129 #ifndef MCLSHIFT
 130 #define MCLSHIFT        11              /* convert bytes to m_buf clusters */
 131                                         /* 2K cluster can hold Ether frame */
 132 #endif  /* MCLSHIFT */
 133
 134 #define MCLBYTES        (1 << MCLSHIFT) /* size of a m_buf cluster */
 135
 136 #ifndef NMBCLUSTERS
 137 #if defined(_KERNEL_OPT)
 138 #include "opt_gateway.h"
 139 #endif
 140
 141 #ifdef GATEWAY
 142 #define NMBCLUSTERS     2048            /* map size, max cluster allocation */
 143 #else
 144 #define NMBCLUSTERS     1024            /* map size, max cluster allocation */
 145 #endif
 146 #endif
 147
 148 #ifndef NFS_RSIZE
 149 #define NFS_RSIZE       32768
 150 #endif
 151 #ifndef NFS_WSIZE
 152 #define NFS_WSIZE       32768
 153 #endif
 154
 155 /*
 156  * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized
 157  * logical pages.
 158  */
 159 #define NKMEMPAGES_MIN_DEFAULT  ((8 * 1024 * 1024) >> PAGE_SHIFT)
 160 #define NKMEMPAGES_MAX_DEFAULT  ((128 * 1024 * 1024) >> PAGE_SHIFT)
 161
 162 /*
 163  * Mach derived conversion macros
 164  */
 165 #define x86_round_pdr(x)        ((((unsigned)(x)) + PDOFSET) & ~PDOFSET)
 166 #define x86_trunc_pdr(x)        ((unsigned)(x) & ~PDOFSET)
 167 #define x86_btod(x)             ((unsigned)(x) >> PDSHIFT)
 168 #define x86_dtob(x)             ((unsigned)(x) << PDSHIFT)
 169 #define x86_round_page(x)       ((((unsigned)(x)) + PGOFSET) & ~PGOFSET)
 170 #define x86_trunc_page(x)       ((unsigned)(x) & ~PGOFSET)
 171 #define x86_btop(x)             ((unsigned)(x) >> PGSHIFT)
 172 #define x86_ptob(x)             ((unsigned)(x) << PGSHIFT)
 173
 174 #endif /* _I386_PARAM_H_ */