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

     /*      $OpenBSD: param.h,v 1.11 1998/08/30 22:05:35 millert Exp $ */
     
     /*-
      * Copyright (c) 1988 University of Utah.
      * Copyright (c) 1992, 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * This code is derived from software contributed to Berkeley by
      * the Systems Programming Group of the University of Utah Computer
     * Science Department and Ralph Campbell.
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      from: Utah Hdr: machparam.h 1.11 89/08/14
     *      from: @(#)param.h       8.1 (Berkeley) 6/10/93
     *      JNPR: param.h,v 1.6.2.1 2007/09/10 07:49:36 girish
     * $FreeBSD: releng/8.1/sys/mips/include/param.h 198728 2009-10-31 18:54:26Z alc $
     */
    
    #ifndef _MACHINE_PARAM_H_
    #define _MACHINE_PARAM_H_
    
    #include <sys/cdefs.h>
    #ifdef _KERNEL
    #ifdef _LOCORE
    #include <machine/psl.h>
    #else
    #include <machine/cpu.h>
    #endif
    #endif
    
    #define __PCI_REROUTE_INTERRUPT
    
    #ifndef MACHINE
    #define MACHINE         "mips"
    #endif
    #ifndef MACHINE_ARCH
    #define MACHINE_ARCH    "mips"
    #endif
    
    /*
     * OBJFORMAT_NAMES is a comma-separated list of the object formats
     * that are supported on the architecture.
     */
    #define OBJFORMAT_NAMES         "elf"
    #define OBJFORMAT_DEFAULT       "elf"
    
    #define MID_MACHINE     0       /* None but has to be defined */
    
    #ifdef SMP
    #define MAXSMPCPU       16
    #define MAXCPU          MAXSMPCPU
    #else
    #define MAXSMPCPU       1
    #define MAXCPU          1
    #endif
    
    /*
     * Round p (pointer or byte index) up to a correctly-aligned value for all
     * data types (int, long, ...).   The result is u_int and must be cast to
     * any desired pointer type.
     */
    #define _ALIGNBYTES     7
    #define _ALIGN(p)       (((u_int)(p) + _ALIGNBYTES) &~ _ALIGNBYTES)
    
    #define ALIGNBYTES      _ALIGNBYTES
    #define ALIGN(p)        _ALIGN(p)
    /*
     * ALIGNED_POINTER is a boolean macro that checks whether an address
     * is valid to fetch data elements of type t from on this architecture.
     * This does not reflect the optimal alignment, just the possibility
     * (within reasonable limits). 
     */
    #define ALIGNED_POINTER(p, t)   ((((unsigned)(p)) & (sizeof (t) - 1)) == 0)
    
    /*
     * CACHE_LINE_SIZE is the compile-time maximum cache line size for an
    * architecture.  It should be used with appropriate caution.
    */
   #define CACHE_LINE_SHIFT        6
   #define CACHE_LINE_SIZE         (1 << CACHE_LINE_SHIFT)
   
   #define NBPG            4096            /* bytes/page */
   #define PGOFSET         (NBPG-1)        /* byte offset into page */
   #define PGSHIFT         12              /* LOG2(NBPG) */
   
   #define PAGE_SHIFT      12              /* LOG2(PAGE_SIZE) */
   #define PAGE_SIZE       (1<<PAGE_SHIFT) /* bytes/page */
   #define PAGE_MASK       (PAGE_SIZE-1)
   #define NPTEPG          (PAGE_SIZE/(sizeof (pt_entry_t)))
   
   #define NBSEG           0x400000        /* bytes/segment */
   #define SEGOFSET        (NBSEG-1)       /* byte offset into segment */
   #define SEGSHIFT        22              /* LOG2(NBSEG) */
   
   #define MAXPAGESIZES    1               /* maximum number of supported page sizes */
   
   /* XXXimp: This has moved to vmparam.h */
   /* Also, this differs from the mips2 definition, but likely is better */
   /* since this means the kernel won't chew up TLBs when it is executing */
   /* code */
   #define KERNBASE        0x80000000      /* start of kernel virtual */
   #define BTOPKERNBASE    ((u_long)KERNBASE >> PGSHIFT)
   
   #define BLKDEV_IOSIZE   2048            /* xxx: Why is this 1/2 page? */
   #define MAXDUMPPGS      1               /* xxx: why is this only one? */
   
   /*
    * NOTE: In FreeBSD, Uarea's don't have a fixed address.
    *       Therefore, any code imported from OpenBSD which depends on
    *       UADDR, UVPN and KERNELSTACK requires porting.
    * XXX: 3 stack pages?  Not 4 which would be more efficient from a tlb
    * XXX: point of view.
    */
   #define KSTACK_PAGES            3       /* kernel stack*/
   #define KSTACK_GUARD_PAGES      0       /* pages of kstack guard; 0 disables */
   
   #define UPAGES                  2
   
   /* pages ("clicks") (4096 bytes) to disk blocks */
   #define ctod(x)         ((x) << (PGSHIFT - DEV_BSHIFT))
   #define dtoc(x)         ((x) >> (PGSHIFT - DEV_BSHIFT))
   
   /*
    * Map a ``block device block'' to a file system block.
    * This should be device dependent, and should use the bsize
    * field from the disk label.
    * For now though just use DEV_BSIZE.
    */
   #define bdbtofsb(bn)    ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE))
   
   /*
    * Conversion macros
    */
   #define mips_round_page(x)      ((((unsigned)(x)) + NBPG - 1) & ~(NBPG-1))
   #define mips_trunc_page(x)      ((unsigned)(x) & ~(NBPG-1))
   #define mips_btop(x)            ((unsigned)(x) >> PGSHIFT)
   #define mips_ptob(x)            ((unsigned)(x) << PGSHIFT)
   #define round_page              mips_round_page
   #define trunc_page              mips_trunc_page
   #define atop(x)                 ((unsigned long)(x) >> PAGE_SHIFT)
   #define ptoa(x)                 ((unsigned long)(x) << PAGE_SHIFT)
   
   #define pgtok(x)                ((x) * (PAGE_SIZE / 1024))
   
   #ifndef _KERNEL
   #define DELAY(n)        { register int N = (n); while (--N > 0); }
   #endif /* !_KERNEL */
   
   #endif /* !_MACHINE_PARAM_H_ */

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