FreeBSD/Linux Kernel Cross Reference
sys/amd64/include/param.h

     /*-
      * SPDX-License-Identifier: BSD-4-Clause
      *
      * Copyright (c) 2002 David E. O'Brien.  All rights reserved.
      * 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.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 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.
     *
     *      @(#)param.h     8.1 (Berkeley) 6/10/93
     * $FreeBSD$
     */
    
    #ifndef _AMD64_INCLUDE_PARAM_H_
    #define _AMD64_INCLUDE_PARAM_H_
    
    #include <machine/_align.h>
    
    /*
     * Machine dependent constants for AMD64.
     */
    
    #define __HAVE_ACPI
    #define __PCI_REROUTE_INTERRUPT
    
    #ifndef MACHINE
    #define MACHINE         "amd64"
    #endif
    #ifndef MACHINE_ARCH
    #define MACHINE_ARCH    "amd64"
    #endif
    #ifndef MACHINE_ARCH32
    #define MACHINE_ARCH32  "i386"
    #endif
    
    #ifdef SMP
    #ifndef MAXCPU
    #define MAXCPU          256
    #endif
    #else
    #define MAXCPU          1
    #endif
    
    #ifndef MAXMEMDOM
    #define MAXMEMDOM       8
    #endif
    
    #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)   1
    
    /*
     * 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)
    
    /* Size of the level 1 page table units */
    #define NPTEPG          (PAGE_SIZE/(sizeof (pt_entry_t)))
    #define NPTEPGSHIFT     9               /* LOG2(NPTEPG) */
    #define PAGE_SHIFT      12              /* LOG2(PAGE_SIZE) */
    #define PAGE_SIZE       (1<<PAGE_SHIFT) /* bytes/page */
   #define PAGE_MASK       (PAGE_SIZE-1)
   /* Size of the level 2 page directory units */
   #define NPDEPG          (PAGE_SIZE/(sizeof (pd_entry_t)))
   #define NPDEPGSHIFT     9               /* LOG2(NPDEPG) */
   #define PDRSHIFT        21              /* LOG2(NBPDR) */
   #define NBPDR           (1<<PDRSHIFT)   /* bytes/page dir */
   #define PDRMASK         (NBPDR-1)
   /* Size of the level 3 page directory pointer table units */
   #define NPDPEPG         (PAGE_SIZE/(sizeof (pdp_entry_t)))
   #define NPDPEPGSHIFT    9               /* LOG2(NPDPEPG) */
   #define PDPSHIFT        30              /* LOG2(NBPDP) */
   #define NBPDP           (1<<PDPSHIFT)   /* bytes/page dir ptr table */
   #define PDPMASK         (NBPDP-1)
   /* Size of the level 4 page-map level-4 table units */
   #define NPML4EPG        (PAGE_SIZE/(sizeof (pml4_entry_t)))
   #define NPML4EPGSHIFT   9               /* LOG2(NPML4EPG) */
   #define PML4SHIFT       39              /* LOG2(NBPML4) */
   #define NBPML4          (1UL<<PML4SHIFT)/* bytes/page map lev4 table */
   #define PML4MASK        (NBPML4-1)
   /* Size of the level 5 page-map level-5 table units */
   #define NPML5EPG        (PAGE_SIZE/(sizeof (pml5_entry_t)))
   #define NPML5EPGSHIFT   9               /* LOG2(NPML5EPG) */
   #define PML5SHIFT       48              /* LOG2(NBPML5) */
   #define NBPML5          (1UL<<PML5SHIFT)/* bytes/page map lev5 table */
   #define PML5MASK        (NBPML5-1)
   
   #define MAXPAGESIZES    3       /* maximum number of supported page sizes */
   
   #define IOPAGES 2               /* pages of i/o permission bitmap */
   /*
    * I/O permission bitmap has a bit for each I/O port plus an additional
    * byte at the end with all bits set. See section "I/O Permission Bit Map"
    * in the Intel SDM for more details.
    */
   #define IOPERM_BITMAP_SIZE      (IOPAGES * PAGE_SIZE + 1)
   
   #ifndef KSTACK_PAGES
   #if defined(KASAN) || defined(KMSAN)
   #define KSTACK_PAGES    6
   #else
   #define KSTACK_PAGES    4       /* pages of kstack (with pcb) */
   #endif
   #endif
   #define KSTACK_GUARD_PAGES 1    /* pages of kstack guard; 0 disables */
   
   /*
    * Mach derived conversion macros
    */
   #define round_page(x)   ((((unsigned long)(x)) + PAGE_MASK) & ~(PAGE_MASK))
   #define trunc_page(x)   ((unsigned long)(x) & ~(PAGE_MASK))
   #define trunc_2mpage(x) ((unsigned long)(x) & ~PDRMASK)
   #define round_2mpage(x) ((((unsigned long)(x)) + PDRMASK) & ~PDRMASK)
   #define trunc_1gpage(x) ((unsigned long)(x) & ~PDPMASK)
   
   #define atop(x)         ((unsigned long)(x) >> PAGE_SHIFT)
   #define ptoa(x)         ((unsigned long)(x) << PAGE_SHIFT)
   
   #define amd64_btop(x)   ((unsigned long)(x) >> PAGE_SHIFT)
   #define amd64_ptob(x)   ((unsigned long)(x) << PAGE_SHIFT)
   
   #define pgtok(x)        ((unsigned long)(x) * (PAGE_SIZE / 1024)) 
   
   #define INKERNEL(va) (((va) >= DMAP_MIN_ADDRESS && (va) < DMAP_MAX_ADDRESS) \
       || ((va) >= VM_MIN_KERNEL_ADDRESS && (va) < VM_MAX_KERNEL_ADDRESS))
   
   #ifdef SMP
   #define SC_TABLESIZE    1024                     /* Must be power of 2. */
   #endif
   
   #endif /* !_AMD64_INCLUDE_PARAM_H_ */

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