osfmk/i386/phys.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * @OSF_COPYRIGHT@
  27  */
  28 /*
  29  * Mach Operating System
  30  * Copyright (c) 1991,1990,1989 Carnegie Mellon University
  31  * All Rights Reserved.
  32  *
  33  * Permission to use, copy, modify and distribute this software and its
  34  * documentation is hereby granted, provided that both the copyright
  35  * notice and this permission notice appear in all copies of the
  36  * software, derivative works or modified versions, and any portions
  37  * thereof, and that both notices appear in supporting documentation.
  38  *
  39  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  40  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  41  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  42  *
  43  * Carnegie Mellon requests users of this software to return to
  44  *
  45  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  46  *  School of Computer Science
  47  *  Carnegie Mellon University
  48  *  Pittsburgh PA 15213-3890
  49  *
  50  * any improvements or extensions that they make and grant Carnegie Mellon
  51  * the rights to redistribute these changes.
  52  */
  53 #include <string.h>
  54
  55 #include <mach/vm_param.h>
  56 #include <mach/boolean.h>
  57 #include <vm/pmap.h>
  58 #include <vm/vm_page.h>
  59 #include <kern/misc_protos.h>
  60
  61 /*
  62  *      pmap_zero_page zeros the specified (machine independent) page.
  63  */
  64 void
  65 pmap_zero_page(
  66                ppnum_t pn)
  67 {
  68         vm_offset_t p;
  69         assert(pn != vm_page_fictitious_addr);
  70         p = (vm_offset_t)i386_ptob(pn);
  71         bzero((char *)phystokv(p), PAGE_SIZE);
  72 }
  73
  74 /*
  75  *      pmap_zero_part_page
  76  *      zeros the specified (machine independent) part of a page.
  77  */
  78 void
  79 pmap_zero_part_page(
  80         ppnum_t         pn,
  81         vm_offset_t     offset,
  82         vm_size_t       len)
  83 {
  84         assert(pn != vm_page_fictitious_addr);
  85         assert(offset + len <= PAGE_SIZE);
  86         bzero((char *)phystokv(i386_ptob(pn)) + offset, len);
  87 }
  88
  89 /*
  90  *      pmap_copy_page copies the specified (machine independent) pages.
  91  */
  92 void
  93 pmap_copy_page(
  94        ppnum_t  psrc,
  95        ppnum_t  pdst)
  96
  97 {
  98         vm_offset_t src,dst;
  99
 100         assert(psrc != vm_page_fictitious_addr);
 101         assert(pdst != vm_page_fictitious_addr);
 102         src = (vm_offset_t)i386_ptob(psrc);
 103         dst = (vm_offset_t)i386_ptob(pdst);
 104
 105         memcpy((void *)phystokv(dst), (void *)phystokv(src), PAGE_SIZE);
 106 }
 107
 108 /*
 109  *      pmap_copy_page copies the specified (machine independent) pages.
 110  */
 111 void
 112 pmap_copy_part_page(
 113         ppnum_t         psrc,
 114         vm_offset_t     src_offset,
 115         ppnum_t         pdst,
 116         vm_offset_t     dst_offset,
 117         vm_size_t       len)
 118 {
 119         vm_offset_t  src, dst;
 120
 121         assert(psrc != vm_page_fictitious_addr);
 122         assert(pdst != vm_page_fictitious_addr);
 123         src = (vm_offset_t)i386_ptob(psrc);
 124         dst = (vm_offset_t)i386_ptob(pdst);
 125         assert(((dst & PAGE_MASK) + dst_offset + len) <= PAGE_SIZE);
 126         assert(((src & PAGE_MASK) + src_offset + len) <= PAGE_SIZE);
 127
 128         memcpy((void *)(phystokv(dst) + dst_offset),
 129                (void *)(phystokv(src) + src_offset), len);
 130 }
 131
 132 /*
 133  *      pmap_copy_part_lpage copies part of a virtually addressed page
 134  *      to a physically addressed page.
 135  */
 136 void
 137 pmap_copy_part_lpage(
 138         vm_offset_t     src,
 139         ppnum_t         pdst,
 140         vm_offset_t     dst_offset,
 141         vm_size_t       len)
 142 {
 143         vm_offset_t dst;
 144
 145         assert(src != vm_page_fictitious_addr);
 146         assert(pdst != vm_page_fictitious_addr);
 147         dst = (vm_offset_t)i386_ptob(pdst);
 148         assert(((dst & PAGE_MASK) + dst_offset + len) <= PAGE_SIZE);
 149
 150         memcpy((void *)(phystokv(dst) + dst_offset), (void *)src, len);
 151 }
 152
 153 /*
 154  *      pmap_copy_part_rpage copies part of a physically addressed page
 155  *      to a virtually addressed page.
 156  */
 157 void
 158 pmap_copy_part_rpage(
 159         ppnum_t         psrc,
 160         vm_offset_t     src_offset,
 161         vm_offset_t     dst,
 162         vm_size_t       len)
 163 {
 164         vm_offset_t src;
 165
 166         assert(psrc != vm_page_fictitious_addr);
 167         assert(dst != vm_page_fictitious_addr);
 168         src = (vm_offset_t)i386_ptob(psrc);
 169         assert(((src & PAGE_MASK) + src_offset + len) <= PAGE_SIZE);
 170
 171         memcpy((void *)dst, (void *)(phystokv(src) + src_offset), len);
 172 }
 173
 174 /*
 175  *      kvtophys(addr)
 176  *
 177  *      Convert a kernel virtual address to a physical address
 178  */
 179 vm_offset_t
 180 kvtophys(
 181         vm_offset_t addr)
 182 {
 183         pt_entry_t *pte;
 184
 185         if ((pte = pmap_pte(kernel_pmap, addr)) == PT_ENTRY_NULL)
 186                 return 0;
 187         return i386_trunc_page(*pte) | (addr & INTEL_OFFMASK);
 188 }