StdLib/Include/Arm/machine/param.h

   1 /*      $NetBSD: param.h,v 1.13 2010/05/06 19:10:26 joerg Exp $ */
   2
   3 /*
   4  * Copyright (c) 1994,1995 Mark Brinicombe.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. All advertising materials mentioning features or use of this software
  16  *    must display the following acknowledgement:
  17  *      This product includes software developed by the RiscBSD team.
  18  * 4. The name "RiscBSD" nor the name of the author may be used to
  19  *    endorse or promote products derived from this software without specific
  20  *    prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY RISCBSD ``AS IS'' AND ANY EXPRESS OR IMPLIED
  23  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  24  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  25  * IN NO EVENT SHALL RISCBSD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
  26  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  27  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  28  * 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
  35 #ifndef _ARM_PARAM_H_
  36 #define _ARM_PARAM_H_
  37
  38 /*
  39  * Machine dependent constants for all ARM processors
  40  */
  41
  42 /*
  43  * For KERNEL code:
  44  *      MACHINE must be defined by the individual port.  This is so that
  45  *      uname returns the correct thing, etc.
  46  *
  47  *      MACHINE_ARCH may be defined by individual ports as a temporary
  48  *      measure while we're finishing the conversion to ELF.
  49  *
  50  * For non-KERNEL code:
  51  *      If ELF, MACHINE and MACHINE_ARCH are forced to "arm/armeb".
  52  */
  53
  54 #if defined(_KERNEL)
  55 #ifndef MACHINE_ARCH                    /* XXX For now */
  56 #ifndef __ARMEB__
  57 #define _MACHINE_ARCH   arm
  58 #define MACHINE_ARCH    "arm"
  59 #else
  60 #define _MACHINE_ARCH   armeb
  61 #define MACHINE_ARCH    "armeb"
  62 #endif /* __ARMEB__ */
  63 #endif /* MACHINE_ARCH */
  64 #else
  65 #undef _MACHINE
  66 #undef MACHINE
  67 #undef _MACHINE_ARCH
  68 #undef MACHINE_ARCH
  69 #define _MACHINE        arm
  70 #define MACHINE         "arm"
  71 #ifndef __ARMEB__
  72 #define _MACHINE_ARCH   arm
  73 #define MACHINE_ARCH    "arm"
  74 #else
  75 #define _MACHINE_ARCH   armeb
  76 #define MACHINE_ARCH    "armeb"
  77 #endif /* __ARMEB__ */
  78 #endif /* !_KERNEL */
  79
  80 #define MID_MACHINE     MID_ARM6
  81
  82 /*
  83  * Round p (pointer or byte index) up to a correctly-aligned value
  84  * for all data types (int, long, ...).   The result is u_int and
  85  * must be cast to any desired pointer type.
  86  *
  87  * ALIGNED_POINTER is a boolean macro that checks whether an address
  88  * is valid to fetch data elements of type t from on this architecture.
  89  * This does not reflect the optimal alignment, just the possibility
  90  * (within reasonable limits).
  91  *
  92  */
  93 #define ALIGNBYTES              (sizeof(int) - 1)
  94 #define ALIGN(p)                (((u_int)(p) + ALIGNBYTES) &~ ALIGNBYTES)
  95 #define ALIGNED_POINTER(p,t)    ((((u_long)(p)) & (sizeof(t)-1)) == 0)
  96 /* ARM-specific macro to align a stack pointer (downwards). */
  97 #define STACKALIGNBYTES         (8 - 1)
  98 #define STACKALIGN(p)           ((u_int)(p) &~ STACKALIGNBYTES)
  99
 100 #define DEV_BSHIFT      9               /* log2(DEV_BSIZE) */
 101 #define DEV_BSIZE       (1 << DEV_BSHIFT)
 102 #define BLKDEV_IOSIZE   2048
 103
 104 #ifndef MAXPHYS
 105 #define MAXPHYS         65536           /* max I/O transfer size */
 106 #endif
 107
 108 /*
 109  * Constants related to network buffer management.
 110  * MCLBYTES must be no larger than NBPG (the software page size), and,
 111  * on machines that exchange pages of input or output buffers with mbuf
 112  * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
 113  * of the hardware page size.
 114  */
 115 #define MSIZE           256             /* size of an mbuf */
 116
 117 #ifndef MCLSHIFT
 118 #define MCLSHIFT        11              /* convert bytes to m_buf clusters */
 119                                         /* 2K cluster can hold Ether frame */
 120 #endif  /* MCLSHIFT */
 121
 122 #define MCLBYTES        (1 << MCLSHIFT) /* size of a m_buf cluster */
 123
 124 #ifndef NMBCLUSTERS_MAX
 125 #define NMBCLUSTERS_MAX (0x2000000 / MCLBYTES)  /* Limit to 64MB for clusters */
 126 #endif
 127
 128 /*
 129  * Compatibility /dev/zero mapping.
 130  */
 131 #ifdef _KERNEL
 132 #ifdef COMPAT_16
 133 #define COMPAT_ZERODEV(x)       (x == makedev(0, _DEV_ZERO_oARM))
 134 #endif
 135 #endif /* _KERNEL */
 136
 137 #endif /* _ARM_PARAM_H_ */