The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/arm/include/param.h

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    1 /*-
    2  * SPDX-License-Identifier: BSD-4-Clause
    3  *
    4  * Copyright (c) 2001 David E. O'Brien
    5  * Copyright (c) 1990 The Regents of the University of California.
    6  * All rights reserved.
    7  *
    8  * This code is derived from software contributed to Berkeley by
    9  * William Jolitz.
   10  *
   11  * Redistribution and use in source and binary forms, with or without
   12  * modification, are permitted provided that the following conditions
   13  * are met:
   14  * 1. Redistributions of source code must retain the above copyright
   15  *    notice, this list of conditions and the following disclaimer.
   16  * 2. Redistributions in binary form must reproduce the above copyright
   17  *    notice, this list of conditions and the following disclaimer in the
   18  *    documentation and/or other materials provided with the distribution.
   19  * 3. All advertising materials mentioning features or use of this software
   20  *    must display the following acknowledgement:
   21  *      This product includes software developed by the University of
   22  *      California, Berkeley and its contributors.
   23  * 4. Neither the name of the University nor the names of its contributors
   24  *    may be used to endorse or promote products derived from this software
   25  *    without specific prior written permission.
   26  *
   27  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   30  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   31  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   32  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   33  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   34  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   35  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   36  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   37  * SUCH DAMAGE.
   38  *
   39  *      from: @(#)param.h       5.8 (Berkeley) 6/28/91
   40  * $FreeBSD$
   41  */
   42 
   43 #ifndef _ARM_INCLUDE_PARAM_H_
   44 #define _ARM_INCLUDE_PARAM_H_
   45 
   46 /*
   47  * Machine dependent constants for StrongARM
   48  */
   49 
   50 #include <machine/_align.h>
   51 
   52 #define STACKALIGNBYTES (8 - 1)
   53 #define STACKALIGN(p)   ((u_int)(p) & ~STACKALIGNBYTES)
   54 
   55 #define __PCI_REROUTE_INTERRUPT
   56 
   57 #if __ARM_ARCH >= 7
   58 #define _V_SUFFIX "v7"
   59 #elif __ARM_ARCH >= 6
   60 #define _V_SUFFIX "v6"
   61 #else
   62 #define _V_SUFFIX ""
   63 #endif
   64 
   65 #ifdef __ARM_BIG_ENDIAN
   66 #define _EB_SUFFIX "eb"
   67 #else
   68 #define _EB_SUFFIX ""
   69 #endif
   70 
   71 #ifndef MACHINE
   72 #define MACHINE         "arm"
   73 #endif
   74 #ifndef MACHINE_ARCH
   75 #define MACHINE_ARCH    "arm" _V_SUFFIX _EB_SUFFIX
   76 #endif
   77 
   78 #if defined(SMP) || defined(KLD_MODULE)
   79 #ifndef MAXCPU
   80 #define MAXCPU          4
   81 #endif
   82 #else
   83 #define MAXCPU          1
   84 #endif /* SMP || KLD_MODULE */
   85 
   86 #ifndef MAXMEMDOM
   87 #define MAXMEMDOM       1
   88 #endif
   89 
   90 #define ALIGNBYTES      _ALIGNBYTES
   91 #define ALIGN(p)        _ALIGN(p)
   92 /*
   93  * ALIGNED_POINTER is a boolean macro that checks whether an address
   94  * is valid to fetch data elements of type t from on this architecture.
   95  * This does not reflect the optimal alignment, just the possibility
   96  * (within reasonable limits).
   97  *
   98  * armv4 and v5 require alignment to the type's size.  armv6 requires 8-byte
   99  * alignment for the ldrd/strd instructions, but otherwise follows armv7 rules.
  100  * armv7 requires that an 8-byte type be aligned to at least a 4-byte boundary;
  101  * access to smaller types can be unaligned, except that the compiler may
  102  * optimize access to adjacent uint32_t values into a single load/store-multiple
  103  * instruction which requires 4-byte alignment, so we must provide the most-
  104  * pessimistic answer possible even on armv7.
  105  */
  106 #define ALIGNED_POINTER(p, t)   ((((unsigned)(p)) & (sizeof(t)-1)) == 0)
  107 
  108 /*
  109  * CACHE_LINE_SIZE is the compile-time maximum cache line size for an
  110  * architecture.  It should be used with appropriate caution.
  111  */
  112 #define CACHE_LINE_SHIFT        6
  113 #define CACHE_LINE_SIZE         (1 << CACHE_LINE_SHIFT)
  114 
  115 #define PAGE_SHIFT      12
  116 #define PAGE_SIZE       (1 << PAGE_SHIFT)       /* Page size */
  117 #define PAGE_MASK       (PAGE_SIZE - 1)
  118 
  119 #define PDR_SHIFT       20 /* log2(NBPDR) */
  120 #define NBPDR           (1 << PDR_SHIFT)
  121 #define PDRMASK         (NBPDR - 1)
  122 #define NPDEPG          (1 << (32 - PDR_SHIFT))
  123 
  124 #define MAXPAGESIZES    2               /* maximum number of supported page sizes */
  125 
  126 #ifndef KSTACK_PAGES
  127 #define KSTACK_PAGES    2
  128 #endif /* !KSTACK_PAGES */
  129 
  130 #ifndef FPCONTEXTSIZE
  131 #define FPCONTEXTSIZE   (0x100)
  132 #endif
  133 
  134 #ifndef KSTACK_GUARD_PAGES
  135 #define KSTACK_GUARD_PAGES      1
  136 #endif /* !KSTACK_GUARD_PAGES */
  137 
  138 #define USPACE_SVC_STACK_TOP            (kstack_pages * PAGE_SIZE)
  139 
  140 /*
  141  * Mach derived conversion macros
  142  */
  143 #define trunc_page(x)           ((x) & ~PAGE_MASK)
  144 #define round_page(x)           (((x) + PAGE_MASK) & ~PAGE_MASK)
  145 #define trunc_1mpage(x)         ((unsigned)(x) & ~PDRMASK)
  146 #define round_1mpage(x)         ((((unsigned)(x)) + PDRMASK) & ~PDRMASK)
  147 
  148 #define atop(x)                 ((unsigned)(x) >> PAGE_SHIFT)
  149 #define ptoa(x)                 ((unsigned)(x) << PAGE_SHIFT)
  150 
  151 #define arm32_btop(x)           ((unsigned)(x) >> PAGE_SHIFT)
  152 #define arm32_ptob(x)           ((unsigned)(x) << PAGE_SHIFT)
  153 
  154 #define pgtok(x)                ((x) * (PAGE_SIZE / 1024))
  155 
  156 #endif /* !_ARM_INCLUDE_PARAM_H_ */

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