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         vm_offset_t p)
  67 {
  68         assert(p != vm_page_fictitious_addr);
  69         bzero((char *)phystokv(p), PAGE_SIZE);
  70 }
  71
  72 /*
  73  *      pmap_zero_part_page
  74  *      zeros the specified (machine independent) part of a page.
  75  */
  76 void
  77 pmap_zero_part_page(
  78         vm_offset_t     p,
  79         vm_offset_t     offset,
  80         vm_size_t       len)
  81 {
  82         assert(p != vm_page_fictitious_addr);
  83         assert(offset + len <= PAGE_SIZE);
  84
  85         bzero((char *)phystokv(p) + offset, len);
  86 }
  87
  88 /*
  89  *      pmap_copy_page copies the specified (machine independent) pages.
  90  */
  91 void
  92 pmap_copy_page(
  93         vm_offset_t src,
  94         vm_offset_t dst)
  95 {
  96         assert(src != vm_page_fictitious_addr);
  97         assert(dst != vm_page_fictitious_addr);
  98
  99         memcpy((void *)phystokv(dst), (void *)phystokv(src), PAGE_SIZE);
 100 }
 101
 102 /*
 103  *      pmap_copy_page copies the specified (machine independent) pages.
 104  */
 105 void
 106 pmap_copy_part_page(
 107         vm_offset_t     src,
 108         vm_offset_t     src_offset,
 109         vm_offset_t     dst,
 110         vm_offset_t     dst_offset,
 111         vm_size_t       len)
 112 {
 113         assert(src != vm_page_fictitious_addr);
 114         assert(dst != vm_page_fictitious_addr);
 115         assert(((dst & PAGE_MASK) + dst_offset + len) <= PAGE_SIZE);
 116         assert(((src & PAGE_MASK) + src_offset + len) <= PAGE_SIZE);
 117
 118         memcpy((void *)(phystokv(dst) + dst_offset),
 119                (void *)(phystokv(src) + src_offset), len);
 120 }
 121
 122 /*
 123  *      pmap_copy_part_lpage copies part of a virtually addressed page
 124  *      to a physically addressed page.
 125  */
 126 void
 127 pmap_copy_part_lpage(
 128         vm_offset_t     src,
 129         vm_offset_t     dst,
 130         vm_offset_t     dst_offset,
 131         vm_size_t       len)
 132 {
 133         assert(src != vm_page_fictitious_addr);
 134         assert(dst != vm_page_fictitious_addr);
 135         assert(((dst & PAGE_MASK) + dst_offset + len) <= PAGE_SIZE);
 136
 137         memcpy((void *)(phystokv(dst) + dst_offset), (void *)src, len);
 138 }
 139
 140 /*
 141  *      pmap_copy_part_rpage copies part of a physically addressed page
 142  *      to a virtually addressed page.
 143  */
 144 void
 145 pmap_copy_part_rpage(
 146         vm_offset_t     src,
 147         vm_offset_t     src_offset,
 148         vm_offset_t     dst,
 149         vm_size_t       len)
 150 {
 151         assert(src != vm_page_fictitious_addr);
 152         assert(dst != vm_page_fictitious_addr);
 153         assert(((src & PAGE_MASK) + src_offset + len) <= PAGE_SIZE);
 154
 155         memcpy((void *)dst, (void *)(phystokv(src) + src_offset), len);
 156 }
 157
 158 /*
 159  *      kvtophys(addr)
 160  *
 161  *      Convert a kernel virtual address to a physical address
 162  */
 163 vm_offset_t
 164 kvtophys(
 165         vm_offset_t addr)
 166 {
 167         pt_entry_t *pte;
 168
 169         if ((pte = pmap_pte(kernel_pmap, addr)) == PT_ENTRY_NULL)
 170                 return 0;
 171         return i386_trunc_page(*pte) | (addr & INTEL_OFFMASK);
 172 }