phys.c

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    1 /* 
    2  * Mach Operating System
    3  * Copyright (c) 1991,1990,1989 Carnegie Mellon University
    4  * All Rights Reserved.
    5  * 
    6  * Permission to use, copy, modify and distribute this software and its
    7  * documentation is hereby granted, provided that both the copyright
    8  * notice and this permission notice appear in all copies of the
    9  * software, derivative works or modified versions, and any portions
   10  * thereof, and that both notices appear in supporting documentation.
   11  * 
   12  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
   13  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
   14  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
   15  * 
   16  * Carnegie Mellon requests users of this software to return to
   17  * 
   18  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
   19  *  School of Computer Science
   20  *  Carnegie Mellon University
   21  *  Pittsburgh PA 15213-3890
   22  * 
   23  * any improvements or extensions that they make and grant Carnegie Mellon
   24  * the rights to redistribute these changes.
   25  */
   26 /* 
   27  * HISTORY
   28  * $Log:        phys.c,v $
   29  * Revision 2.8  91/05/18  14:30:02  rpd
   30  *      Added vm_page_fictitious_addr assertions.
   31  *      [91/04/10            rpd]
   32  * 
   33  * Revision 2.7  91/05/14  16:13:29  mrt
   34  *      Correcting copyright
   35  * 
   36  * Revision 2.6  91/05/08  12:41:06  dbg
   37  *      More cleanup.
   38  *      [91/03/21            dbg]
   39  * 
   40  * Revision 2.5  91/03/16  14:45:06  rpd
   41  *      Added resume, continuation arguments to vm_fault.
   42  *      [91/02/05            rpd]
   43  * 
   44  * Revision 2.4  91/02/05  17:13:36  mrt
   45  *      Changed to new Mach copyright
   46  *      [91/02/01  17:36:36  mrt]
   47  * 
   48  * Revision 2.3  90/12/04  14:46:19  jsb
   49  *      Changes for merged intel/pmap.{c,h}.
   50  *      [90/12/04  11:17:19  jsb]
   51  * 
   52  * Revision 2.2  90/05/03  15:35:56  dbg
   53  *      Use 'write' bit in pte instead of protection field.
   54  *      [90/03/25            dbg]
   55  * 
   56  *      Use bzero instead of bclear.
   57  *      [90/02/15            dbg]
   58  * 
   59  * Revision 1.3  89/02/26  12:32:59  gm0w
   60  *      Changes for cleanup.
   61  * 
   62  */
   63  
   64 #include <mach/boolean.h>
   65 #include <kern/task.h>
   66 #include <kern/thread.h>
   67 #include <vm/vm_map.h>
   68 #include <mach/vm_param.h>
   69 #include <mach/vm_prot.h>
   70 #include <vm/vm_kern.h>
   71 #include <vm/vm_page.h>
   72 
   73 #include <i386/pmap.h>
   74 #include <mach/i386/vm_param.h>
   75 
   76 /*
   77  *      pmap_zero_page zeros the specified (machine independent) page.
   78  */
   79 pmap_zero_page(p)
   80         vm_offset_t p;
   81 {
   82         assert(p != vm_page_fictitious_addr);
   83         bzero(phystokv(p), PAGE_SIZE);
   84 }
   85 
   86 /*
   87  *      pmap_copy_page copies the specified (machine independent) pages.
   88  */
   89 pmap_copy_page(src, dst)
   90         vm_offset_t src, dst;
   91 {
   92         assert(src != vm_page_fictitious_addr);
   93         assert(dst != vm_page_fictitious_addr);
   94 
   95         bcopy(phystokv(src), phystokv(dst), PAGE_SIZE);
   96 }
   97 
   98 /*
   99  *      copy_to_phys(src_addr_v, dst_addr_p, count)
  100  *
  101  *      Copy virtual memory to physical memory
  102  */
  103 copy_to_phys(src_addr_v, dst_addr_p, count)
  104         vm_offset_t src_addr_v, dst_addr_p;
  105         int count;
  106 {
  107         assert(dst_addr_p != vm_page_fictitious_addr);
  108         bcopy(src_addr_v, phystokv(dst_addr_p), count);
  109 }
  110 
  111 /*
  112  *      copy_from_phys(src_addr_p, dst_addr_v, count)
  113  *
  114  *      Copy physical memory to virtual memory.  The virtual memory
  115  *      is assumed to be present (e.g. the buffer pool).
  116  */
  117 copy_from_phys(src_addr_p, dst_addr_v, count)
  118         vm_offset_t src_addr_p, dst_addr_v;
  119         int count;
  120 {
  121         assert(src_addr_p != vm_page_fictitious_addr);
  122         bcopy(phystokv(src_addr_p), dst_addr_v, count);
  123 }
  124 
  125 /*
  126  *      kvtophys(addr)
  127  *
  128  *      Convert a kernel virtual address to a physical address
  129  */
  130 vm_offset_t
  131 kvtophys(addr)
  132 vm_offset_t addr;
  133 {
  134         pt_entry_t *pte;
  135 
  136         if ((pte = pmap_pte(kernel_pmap, addr)) == PT_ENTRY_NULL)
  137                 return 0;
  138         return i386_trunc_page(*pte) | (addr & INTEL_OFFMASK);
  139 }

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

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