FreeBSD/Linux Kernel Cross Reference
sys/i386/phys.c

     /* 
      * Mach Operating System
      * Copyright (c) 1993,1991,1990,1989 Carnegie Mellon University
      * All Rights Reserved.
      * 
      * Permission to use, copy, modify and distribute this software and its
      * documentation is hereby granted, provided that both the copyright
      * notice and this permission notice appear in all copies of the
      * software, derivative works or modified versions, and any portions
     * thereof, and that both notices appear in supporting documentation.
     * 
     * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
     * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     * 
     * Carnegie Mellon requests users of this software to return to
     * 
     *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
     *  School of Computer Science
     *  Carnegie Mellon University
     *  Pittsburgh PA 15213-3890
     * 
     * any improvements or extensions that they make and grant Carnegie Mellon
     * the rights to redistribute these changes.
     */
    /* 
     * HISTORY
     * $Log:        phys.c,v $
     * Revision 2.9  93/11/17  16:37:48  dbg
     *      De-linted.  Removed copy_to_phys and copy_from_phys
     *      (unused).
     *      [93/09/29            dbg]
     * 
     * Revision 2.8  91/05/18  14:30:02  rpd
     *      Added vm_page_fictitious_addr assertions.
     *      [91/04/10            rpd]
     * 
     * Revision 2.7  91/05/14  16:13:29  mrt
     *      Correcting copyright
     * 
     * Revision 2.6  91/05/08  12:41:06  dbg
     *      More cleanup.
     *      [91/03/21            dbg]
     * 
     * Revision 2.5  91/03/16  14:45:06  rpd
     *      Added resume, continuation arguments to vm_fault.
     *      [91/02/05            rpd]
     * 
     * Revision 2.4  91/02/05  17:13:36  mrt
     *      Changed to new Mach copyright
     *      [91/02/01  17:36:36  mrt]
     * 
     * Revision 2.3  90/12/04  14:46:19  jsb
     *      Changes for merged intel/pmap.{c,h}.
     *      [90/12/04  11:17:19  jsb]
     * 
     * Revision 2.2  90/05/03  15:35:56  dbg
     *      Use 'write' bit in pte instead of protection field.
     *      [90/03/25            dbg]
     * 
     *      Use bzero instead of bclear.
     *      [90/02/15            dbg]
     * 
     * Revision 1.3  89/02/26  12:32:59  gm0w
     *      Changes for cleanup.
     * 
     */
     
    #include <mach/boolean.h>
    #include <kern/task.h>
    #include <kern/thread.h>
    #include <vm/vm_map.h>
    #include <mach/vm_param.h>
    #include <mach/vm_prot.h>
    #include <vm/vm_kern.h>
    #include <vm/vm_page.h>
    
    #include <i386/pmap.h>
    #include <mach/i386/vm_param.h>
    
    #include <kern/memory.h>        /* bcopy, bzero */
    
    /*
     *      kvtophys(addr)
     *
     *      Convert a kernel virtual address to a physical address
     */
    vm_offset_t
    kvtophys(
            vm_offset_t addr)
    {
            pt_entry_t *pte;
    
            if ((pte = pmap_pte(kernel_pmap, addr)) == PT_ENTRY_NULL)
                    return 0;
            return i386_trunc_page(*pte) | (addr & INTEL_OFFMASK);
    }
    
    /*
    *      pmap_zero_page zeros the specified (machine independent) page.
    */
   void pmap_zero_page(
           vm_offset_t p)
   {
           assert(p != vm_page_fictitious_addr);
           bzero((void *) phystokv(p), PAGE_SIZE);
   }
   
   /*
    *      pmap_copy_page copies the specified (machine independent) pages.
    */
   void pmap_copy_page(
           vm_offset_t src,
           vm_offset_t dst)
   {
           assert(src != vm_page_fictitious_addr);
           assert(dst != vm_page_fictitious_addr);
   
           bcopy((void *) phystokv(src), (void *) phystokv(dst), PAGE_SIZE);
   }
   

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