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      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 _AARCH64_PARAM_H_
     36 #define _AARCH64_PARAM_H_
     37 
     38 // TODO: These were based on the ARMv7 version. Verify that it is correct.
     39 
     40 /*
     41  * Machine dependent constants for all ARM processors
     42  */
     43 
     44 /*
     45  * For KERNEL code:
     46  *      MACHINE must be defined by the individual port.  This is so that
     47  *      uname returns the correct thing, etc.
     48  *
     49  *      MACHINE_ARCH may be defined by individual ports as a temporary
     50  *      measure while we're finishing the conversion to ELF.
     51  *
     52  * For non-KERNEL code:
     53  *      If ELF, MACHINE and MACHINE_ARCH are forced to "arm/armeb".
     54  */
     55 
     56 #if defined(_KERNEL)
     57 #undef _MACHINE
     58 #undef MACHINE
     59 #undef _MACHINE_ARCH
     60 #undef MACHINE_ARCH
     61 #define _MACHINE        aarch64
     62 #define MACHINE         "aarch64"
     63 #define _MACHINE_ARCH   aarch64
     64 #define MACHINE_ARCH    "aarch64"
     65 #endif /* !_KERNEL */
     66 
     67 #define MID_MACHINE     MID_AARCH64
     68 
     69 /*
     70  * Round p (pointer or byte index) up to a correctly-aligned value
     71  * for all data types (int, long, ...).   The result is u_int and
     72  * must be cast to any desired pointer type.
     73  *
     74  * ALIGNED_POINTER is a boolean macro that checks whether an address
     75  * is valid to fetch data elements of type t from on this architecture.
     76  * This does not reflect the optimal alignment, just the possibility
     77  * (within reasonable limits).
     78  *
     79  */
     80 #define ALIGNBYTES              (sizeof(int) - 1)
     81 #define ALIGN(p)                (((u_int)(p) + ALIGNBYTES) &~ ALIGNBYTES)
     82 #define ALIGNED_POINTER(p,t)    ((((u_long)(p)) & (sizeof(t)-1)) == 0)
     83 /* ARM-specific macro to align a stack pointer (downwards). */
     84 #define STACKALIGNBYTES         (8 - 1)
     85 #define STACKALIGN(p)           ((u_int)(p) &~ STACKALIGNBYTES)
     86 
     87 #define DEV_BSHIFT      9               /* log2(DEV_BSIZE) */
     88 #define DEV_BSIZE       (1 << DEV_BSHIFT)
     89 #define BLKDEV_IOSIZE   2048
     90 
     91 #ifndef MAXPHYS
     92 #define MAXPHYS         65536           /* max I/O transfer size */
     93 #endif
     94 
     95 /*
     96  * Constants related to network buffer management.
     97  * MCLBYTES must be no larger than NBPG (the software page size), and,
     98  * on machines that exchange pages of input or output buffers with mbuf
     99  * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
    100  * of the hardware page size.
    101  */
    102 #define MSIZE           256             /* size of an mbuf */
    103 
    104 #ifndef MCLSHIFT
    105 #define MCLSHIFT        11              /* convert bytes to m_buf clusters */
    106                                         /* 2K cluster can hold Ether frame */
    107 #endif  /* MCLSHIFT */
    108 
    109 #define MCLBYTES        (1 << MCLSHIFT) /* size of a m_buf cluster */
    110 
    111 #ifndef NMBCLUSTERS_MAX
    112 #define NMBCLUSTERS_MAX (0x2000000 / MCLBYTES)  /* Limit to 64MB for clusters */
    113 #endif
    114 
    115 /*
    116  * Compatibility /dev/zero mapping.
    117  */
    118 #ifdef _KERNEL
    119 #ifdef COMPAT_16
    120 #define COMPAT_ZERODEV(x)       (x == makedev(0, _DEV_ZERO_oARM))
    121 #endif
    122 #endif /* _KERNEL */
    123 
    124 #endif /* _AARCH64_PARAM_H_ */
    125