osfmk/i386/phys.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * @OSF_COPYRIGHT@
  24  */
  25 /*
  26  * Mach Operating System
  27  * Copyright (c) 1991,1990,1989 Carnegie Mellon University
  28  * All Rights Reserved.
  29  *
  30  * Permission to use, copy, modify and distribute this software and its
  31  * documentation is hereby granted, provided that both the copyright
  32  * notice and this permission notice appear in all copies of the
  33  * software, derivative works or modified versions, and any portions
  34  * thereof, and that both notices appear in supporting documentation.
  35  *
  36  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  37  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  38  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  39  *
  40  * Carnegie Mellon requests users of this software to return to
  41  *
  42  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  43  *  School of Computer Science
  44  *  Carnegie Mellon University
  45  *  Pittsburgh PA 15213-3890
  46  *
  47  * any improvements or extensions that they make and grant Carnegie Mellon
  48  * the rights to redistribute these changes.
  49  */
  50 #include <string.h>
  51
  52 #include <mach/vm_param.h>
  53 #include <mach/boolean.h>
  54 #include <vm/pmap.h>
  55 #include <vm/vm_page.h>
  56 #include <kern/misc_protos.h>
  57
  58 /*
  59  *      pmap_zero_page zeros the specified (machine independent) page.
  60  */
  61 void
  62 pmap_zero_page(
  63         vm_offset_t p)
  64 {
  65         assert(p != vm_page_fictitious_addr);
  66         bzero((char *)phystokv(p), PAGE_SIZE);
  67 }
  68
  69 /*
  70  *      pmap_zero_part_page
  71  *      zeros the specified (machine independent) part of a page.
  72  */
  73 void
  74 pmap_zero_part_page(
  75         vm_offset_t     p,
  76         vm_offset_t     offset,
  77         vm_size_t       len)
  78 {
  79         assert(p != vm_page_fictitious_addr);
  80         assert(offset + len <= PAGE_SIZE);
  81
  82         bzero((char *)phystokv(p) + offset, len);
  83 }
  84
  85 /*
  86  *      pmap_copy_page copies the specified (machine independent) pages.
  87  */
  88 void
  89 pmap_copy_page(
  90         vm_offset_t src,
  91         vm_offset_t dst)
  92 {
  93         assert(src != vm_page_fictitious_addr);
  94         assert(dst != vm_page_fictitious_addr);
  95
  96         memcpy((void *)phystokv(dst), (void *)phystokv(src), PAGE_SIZE);
  97 }
  98
  99 /*
 100  *      pmap_copy_page copies the specified (machine independent) pages.
 101  */
 102 void
 103 pmap_copy_part_page(
 104         vm_offset_t     src,
 105         vm_offset_t     src_offset,
 106         vm_offset_t     dst,
 107         vm_offset_t     dst_offset,
 108         vm_size_t       len)
 109 {
 110         assert(src != vm_page_fictitious_addr);
 111         assert(dst != vm_page_fictitious_addr);
 112         assert(((dst & PAGE_MASK) + dst_offset + len) <= PAGE_SIZE);
 113         assert(((src & PAGE_MASK) + src_offset + len) <= PAGE_SIZE);
 114
 115         memcpy((void *)(phystokv(dst) + dst_offset),
 116                (void *)(phystokv(src) + src_offset), len);
 117 }
 118
 119 /*
 120  *      pmap_copy_part_lpage copies part of a virtually addressed page
 121  *      to a physically addressed page.
 122  */
 123 void
 124 pmap_copy_part_lpage(
 125         vm_offset_t     src,
 126         vm_offset_t     dst,
 127         vm_offset_t     dst_offset,
 128         vm_size_t       len)
 129 {
 130         assert(src != vm_page_fictitious_addr);
 131         assert(dst != vm_page_fictitious_addr);
 132         assert(((dst & PAGE_MASK) + dst_offset + len) <= PAGE_SIZE);
 133
 134         memcpy((void *)(phystokv(dst) + dst_offset), (void *)src, len);
 135 }
 136
 137 /*
 138  *      pmap_copy_part_rpage copies part of a physically addressed page
 139  *      to a virtually addressed page.
 140  */
 141 void
 142 pmap_copy_part_rpage(
 143         vm_offset_t     src,
 144         vm_offset_t     src_offset,
 145         vm_offset_t     dst,
 146         vm_size_t       len)
 147 {
 148         assert(src != vm_page_fictitious_addr);
 149         assert(dst != vm_page_fictitious_addr);
 150         assert(((src & PAGE_MASK) + src_offset + len) <= PAGE_SIZE);
 151
 152         memcpy((void *)dst, (void *)(phystokv(src) + src_offset), len);
 153 }
 154
 155 /*
 156  *      kvtophys(addr)
 157  *
 158  *      Convert a kernel virtual address to a physical address
 159  */
 160 vm_offset_t
 161 kvtophys(
 162         vm_offset_t addr)
 163 {
 164         pt_entry_t *pte;
 165
 166         if ((pte = pmap_pte(kernel_pmap, addr)) == PT_ENTRY_NULL)
 167                 return 0;
 168         return i386_trunc_page(*pte) | (addr & INTEL_OFFMASK);
 169 }