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                ppnum_t pn)
  64 {
  65         vm_offset_t p;
  66         assert(pn != vm_page_fictitious_addr);
  67         p = (vm_offset_t)i386_ptob(pn);
  68         bzero((char *)phystokv(p), PAGE_SIZE);
  69 }
  70
  71 /*
  72  *      pmap_zero_part_page
  73  *      zeros the specified (machine independent) part of a page.
  74  */
  75 void
  76 pmap_zero_part_page(
  77         ppnum_t         pn,
  78         vm_offset_t     offset,
  79         vm_size_t       len)
  80 {
  81         assert(pn != vm_page_fictitious_addr);
  82         assert(offset + len <= PAGE_SIZE);
  83         bzero((char *)phystokv(i386_ptob(pn)) + offset, len);
  84 }
  85
  86 /*
  87  *      pmap_copy_page copies the specified (machine independent) pages.
  88  */
  89 void
  90 pmap_copy_page(
  91        ppnum_t  psrc,
  92        ppnum_t  pdst)
  93
  94 {
  95         vm_offset_t src,dst;
  96
  97         assert(psrc != vm_page_fictitious_addr);
  98         assert(pdst != vm_page_fictitious_addr);
  99         src = (vm_offset_t)i386_ptob(psrc);
 100         dst = (vm_offset_t)i386_ptob(pdst);
 101
 102         memcpy((void *)phystokv(dst), (void *)phystokv(src), PAGE_SIZE);
 103 }
 104
 105 /*
 106  *      pmap_copy_page copies the specified (machine independent) pages.
 107  */
 108 void
 109 pmap_copy_part_page(
 110         ppnum_t         psrc,
 111         vm_offset_t     src_offset,
 112         ppnum_t         pdst,
 113         vm_offset_t     dst_offset,
 114         vm_size_t       len)
 115 {
 116         vm_offset_t  src, dst;
 117
 118         assert(psrc != vm_page_fictitious_addr);
 119         assert(pdst != vm_page_fictitious_addr);
 120         src = (vm_offset_t)i386_ptob(psrc);
 121         dst = (vm_offset_t)i386_ptob(pdst);
 122         assert(((dst & PAGE_MASK) + dst_offset + len) <= PAGE_SIZE);
 123         assert(((src & PAGE_MASK) + src_offset + len) <= PAGE_SIZE);
 124
 125         memcpy((void *)(phystokv(dst) + dst_offset),
 126                (void *)(phystokv(src) + src_offset), len);
 127 }
 128
 129 /*
 130  *      pmap_copy_part_lpage copies part of a virtually addressed page
 131  *      to a physically addressed page.
 132  */
 133 void
 134 pmap_copy_part_lpage(
 135         vm_offset_t     src,
 136         ppnum_t         pdst,
 137         vm_offset_t     dst_offset,
 138         vm_size_t       len)
 139 {
 140         vm_offset_t dst;
 141
 142         assert(src != vm_page_fictitious_addr);
 143         assert(pdst != vm_page_fictitious_addr);
 144         dst = (vm_offset_t)i386_ptob(pdst);
 145         assert(((dst & PAGE_MASK) + dst_offset + len) <= PAGE_SIZE);
 146
 147         memcpy((void *)(phystokv(dst) + dst_offset), (void *)src, len);
 148 }
 149
 150 /*
 151  *      pmap_copy_part_rpage copies part of a physically addressed page
 152  *      to a virtually addressed page.
 153  */
 154 void
 155 pmap_copy_part_rpage(
 156         ppnum_t         psrc,
 157         vm_offset_t     src_offset,
 158         vm_offset_t     dst,
 159         vm_size_t       len)
 160 {
 161         vm_offset_t src;
 162
 163         assert(psrc != vm_page_fictitious_addr);
 164         assert(dst != vm_page_fictitious_addr);
 165         src = (vm_offset_t)i386_ptob(psrc);
 166         assert(((src & PAGE_MASK) + src_offset + len) <= PAGE_SIZE);
 167
 168         memcpy((void *)dst, (void *)(phystokv(src) + src_offset), len);
 169 }
 170
 171 /*
 172  *      kvtophys(addr)
 173  *
 174  *      Convert a kernel virtual address to a physical address
 175  */
 176 vm_offset_t
 177 kvtophys(
 178         vm_offset_t addr)
 179 {
 180         pt_entry_t *pte;
 181
 182         if ((pte = pmap_pte(kernel_pmap, addr)) == PT_ENTRY_NULL)
 183                 return 0;
 184         return i386_trunc_page(*pte) | (addr & INTEL_OFFMASK);
 185 }