sys/arch/i386/include/param.h

   1 /*      $NetBSD: param.h,v 1.77 2012/04/20 22:23:24 rmind 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 /*
  45  * MAXCPUS must be defined before cpu.h inclusion.  Note: i386 might
  46  * support more CPUs, but due to the limited KVA space available on
  47  * i386, such support would be inefficient.  Use amd64 instead.
  48  */
  49 #define MAXCPUS         32
  50
  51 #ifdef _KERNEL
  52 #include <machine/cpu.h>
  53 #endif
  54
  55 #define _MACHINE        i386
  56 #define MACHINE         "i386"
  57 #define _MACHINE_ARCH   i386
  58 #define MACHINE_ARCH    "i386"
  59 #define MID_MACHINE     MID_I386
  60
  61 #define ALIGNED_POINTER(p,t)    1
  62
  63 #define PGSHIFT         12              /* LOG2(NBPG) */
  64 #define NBPG            (1 << PGSHIFT)  /* bytes/page */
  65 #define PGOFSET         (NBPG-1)        /* byte offset into page */
  66 #define NPTEPG          (NBPG/(sizeof (pt_entry_t)))
  67
  68 #if defined(_KERNEL_OPT)
  69 #include "opt_kernbase.h"
  70 #endif /* defined(_KERNEL_OPT) */
  71
  72 #ifdef KERNBASE_LOCORE
  73 #error "You should only re-define KERNBASE"
  74 #endif
  75
  76 #ifndef KERNBASE
  77 #define KERNBASE        0xc0000000UL    /* start of kernel virtual space */
  78 #endif
  79
  80 #define KERNTEXTOFF     (KERNBASE + 0x100000) /* start of kernel text */
  81 #define BTOPKERNBASE    (KERNBASE >> PGSHIFT)
  82
  83 #define DEV_BSHIFT      9               /* log2(DEV_BSIZE) */
  84 #define DEV_BSIZE       (1 << DEV_BSHIFT)
  85 #define BLKDEV_IOSIZE   2048
  86 #ifndef MAXPHYS
  87 #define MAXPHYS         (64 * 1024)     /* max raw I/O transfer size */
  88 #endif
  89
  90 #define SSIZE           1               /* initial stack size/NBPG */
  91 #define SINCR           1               /* increment of stack/NBPG */
  92
  93 #ifndef UPAGES
  94 # ifdef DIAGNOSTIC
  95 #  define       UPAGES          3       /* 2 + 1 page for redzone */
  96 # else
  97 #  define       UPAGES          2       /* normal pages of u-area */
  98 # endif /* DIAGNOSTIC */
  99 #endif /* !defined(UPAGES) */
 100 #define USPACE          (UPAGES * NBPG) /* total size of u-area */
 101 #define INTRSTACKSIZE   8192
 102
 103 #ifndef MSGBUFSIZE
 104 #define MSGBUFSIZE      8*NBPG          /* default message buffer size */
 105 #endif
 106
 107 /*
 108  * Constants related to network buffer management.
 109  * MCLBYTES must be no larger than NBPG (the software page size), and,
 110  * on machines that exchange pages of input or output buffers with mbuf
 111  * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
 112  * of the hardware page size.
 113  */
 114 #define MSIZE           256             /* size of an mbuf */
 115
 116 #ifndef MCLSHIFT
 117 #define MCLSHIFT        11              /* convert bytes to m_buf clusters */
 118                                         /* 2K cluster can hold Ether frame */
 119 #endif  /* MCLSHIFT */
 120
 121 #define MCLBYTES        (1 << MCLSHIFT) /* size of a m_buf cluster */
 122
 123 #ifndef NMBCLUSTERS_MAX
 124 #define NMBCLUSTERS_MAX (0x2000000 / MCLBYTES)  /* Limit to 64MB for clusters */
 125 #endif
 126
 127 #ifndef NFS_RSIZE
 128 #define NFS_RSIZE       32768
 129 #endif
 130 #ifndef NFS_WSIZE
 131 #define NFS_WSIZE       32768
 132 #endif
 133
 134 /*
 135  * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized
 136  * logical pages.
 137  */
 138 #define NKMEMPAGES_MIN_DEFAULT  ((16 * 1024 * 1024) >> PAGE_SHIFT)
 139 #define NKMEMPAGES_MAX_DEFAULT  ((360 * 1024 * 1024) >> PAGE_SHIFT)
 140
 141 /*
 142  * Mach derived conversion macros
 143  */
 144 #define x86_round_pdr(x) \
 145         ((((unsigned long)(x)) + (NBPD_L2 - 1)) & ~(NBPD_L2 - 1))
 146 #define x86_trunc_pdr(x)        ((unsigned long)(x) & ~(NBPD_L2 - 1))
 147 #define x86_btod(x)             ((unsigned long)(x) >> L2_SHIFT)
 148 #define x86_dtob(x)             ((unsigned long)(x) << L2_SHIFT)
 149 #define x86_round_page(x)       ((((paddr_t)(x)) + PGOFSET) & ~PGOFSET)
 150 #define x86_trunc_page(x)       ((paddr_t)(x) & ~PGOFSET)
 151 #define x86_btop(x)             ((paddr_t)(x) >> PGSHIFT)
 152 #define x86_ptob(x)             ((paddr_t)(x) << PGSHIFT)
 153
 154 #endif /* _I386_PARAM_H_ */