osfmk/i386/phys.c

   1 /*
   2  * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_OSREFERENCE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License.  The rights granted to you under the
  10  * License may not be used to create, or enable the creation or
  11  * redistribution of, unlawful or unlicensed copies of an Apple operating
  12  * system, or to circumvent, violate, or enable the circumvention or
  13  * violation of, any terms of an Apple operating system software license
  14  * agreement.
  15  *
  16  * Please obtain a copy of the License at
  17  * http://www.opensource.apple.com/apsl/ and read it before using this
  18  * file.
  19  *
  20  * The Original Code and all software distributed under the License are
  21  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  22  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  23  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  25  * Please see the License for the specific language governing rights and
  26  * limitations under the License.
  27  *
  28  * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
  29  */
  30 /*
  31  * @OSF_COPYRIGHT@
  32  */
  33 /*
  34  * Mach Operating System
  35  * Copyright (c) 1991,1990,1989 Carnegie Mellon University
  36  * All Rights Reserved.
  37  *
  38  * Permission to use, copy, modify and distribute this software and its
  39  * documentation is hereby granted, provided that both the copyright
  40  * notice and this permission notice appear in all copies of the
  41  * software, derivative works or modified versions, and any portions
  42  * thereof, and that both notices appear in supporting documentation.
  43  *
  44  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  45  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  46  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  47  *
  48  * Carnegie Mellon requests users of this software to return to
  49  *
  50  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  51  *  School of Computer Science
  52  *  Carnegie Mellon University
  53  *  Pittsburgh PA 15213-3890
  54  *
  55  * any improvements or extensions that they make and grant Carnegie Mellon
  56  * the rights to redistribute these changes.
  57  */
  58
  59 #include <mach_rt.h>
  60 #include <mach_debug.h>
  61 #include <mach_ldebug.h>
  62
  63 #include <sys/kdebug.h>
  64
  65 #include <mach/kern_return.h>
  66 #include <mach/thread_status.h>
  67 #include <mach/vm_param.h>
  68
  69 #include <kern/counters.h>
  70 #include <kern/mach_param.h>
  71 #include <kern/task.h>
  72 #include <kern/thread.h>
  73 #include <kern/sched_prim.h>
  74 #include <kern/misc_protos.h>
  75 #include <kern/assert.h>
  76 #include <kern/spl.h>
  77 #include <ipc/ipc_port.h>
  78 #include <vm/vm_kern.h>
  79 #include <vm/vm_map.h>
  80 #include <vm/pmap.h>
  81
  82 #include <i386/cpu_data.h>
  83 #include <i386/cpu_number.h>
  84 #include <i386/thread.h>
  85 #include <i386/eflags.h>
  86 #include <i386/proc_reg.h>
  87 #include <i386/seg.h>
  88 #include <i386/tss.h>
  89 #include <i386/user_ldt.h>
  90 #include <i386/fpu.h>
  91 #include <i386/iopb_entries.h>
  92 #include <i386/misc_protos.h>
  93
  94 /*
  95  *      pmap_zero_page zeros the specified (machine independent) page.
  96  */
  97 void
  98 pmap_zero_page(
  99                ppnum_t pn)
 100 {
 101         assert(pn != vm_page_fictitious_addr);
 102         bzero_phys((addr64_t)i386_ptob(pn), PAGE_SIZE);
 103 }
 104
 105 /*
 106  *      pmap_zero_part_page
 107  *      zeros the specified (machine independent) part of a page.
 108  */
 109 void
 110 pmap_zero_part_page(
 111         ppnum_t         pn,
 112         vm_offset_t     offset,
 113         vm_size_t       len)
 114 {
 115         assert(pn != vm_page_fictitious_addr);
 116         assert(offset + len <= PAGE_SIZE);
 117         bzero_phys((addr64_t)(i386_ptob(pn) + offset), len);
 118 }
 119
 120 /*
 121  *      pmap_copy_page copies the specified (machine independent) pages.
 122  */
 123 void
 124 pmap_copy_part_page(
 125         ppnum_t         psrc,
 126         vm_offset_t     src_offset,
 127         ppnum_t         pdst,
 128         vm_offset_t     dst_offset,
 129         vm_size_t       len)
 130 {
 131         pmap_paddr_t src, dst;
 132
 133         assert(psrc != vm_page_fictitious_addr);
 134         assert(pdst != vm_page_fictitious_addr);
 135
 136         src = i386_ptob(psrc);
 137         dst = i386_ptob(pdst);
 138
 139         assert((((uint32_t)dst & PAGE_MASK) + dst_offset + len) <= PAGE_SIZE);
 140         assert((((uint32_t)src & PAGE_MASK) + src_offset + len) <= PAGE_SIZE);
 141
 142         bcopy_phys((addr64_t)src + (src_offset & INTEL_OFFMASK),
 143                    (addr64_t)dst + (dst_offset & INTEL_OFFMASK),
 144                    len);
 145 }
 146
 147 /*
 148  *      pmap_copy_part_lpage copies part of a virtually addressed page
 149  *      to a physically addressed page.
 150  */
 151 void
 152 pmap_copy_part_lpage(
 153         vm_offset_t     src,
 154         ppnum_t         pdst,
 155         vm_offset_t     dst_offset,
 156         vm_size_t       len)
 157 {
 158         mapwindow_t *map;
 159
 160         assert(pdst != vm_page_fictitious_addr);
 161         assert((dst_offset + len) <= PAGE_SIZE);
 162
 163         mp_disable_preemption();
 164
 165         map = pmap_get_mapwindow(INTEL_PTE_VALID | INTEL_PTE_RW | (i386_ptob(pdst) & PG_FRAME) |
 166                                  INTEL_PTE_REF | INTEL_PTE_MOD);
 167         if (map == 0) {
 168                 panic("pmap_copy_part_lpage");
 169         }
 170         invlpg((uintptr_t)map->prv_CADDR);
 171
 172         memcpy((void *) (map->prv_CADDR + (dst_offset & INTEL_OFFMASK)), (void *) src, len);
 173         *map->prv_CMAP = 0;
 174
 175         mp_enable_preemption();
 176 }
 177
 178 /*
 179  *      pmap_copy_part_rpage copies part of a physically addressed page
 180  *      to a virtually addressed page.
 181  */
 182 void
 183 pmap_copy_part_rpage(
 184         ppnum_t         psrc,
 185         vm_offset_t     src_offset,
 186         vm_offset_t     dst,
 187         vm_size_t       len)
 188 {
 189         mapwindow_t *map;
 190
 191         assert(psrc != vm_page_fictitious_addr);
 192         assert((src_offset + len) <= PAGE_SIZE);
 193
 194         mp_disable_preemption();
 195
 196         map = pmap_get_mapwindow(INTEL_PTE_VALID | INTEL_PTE_RW | (i386_ptob(psrc) & PG_FRAME) |
 197                                  INTEL_PTE_REF);
 198         if (map == 0) {
 199                 panic("pmap_copy_part_rpage");
 200         }
 201         invlpg((uintptr_t) map->prv_CADDR);
 202
 203         memcpy((void *) dst, (void *) (map->prv_CADDR + (src_offset & INTEL_OFFMASK)), len);
 204         *map->prv_CMAP = 0;
 205
 206         mp_enable_preemption();
 207 }
 208
 209 /*
 210  *      kvtophys(addr)
 211  *
 212  *      Convert a kernel virtual address to a physical address
 213  */
 214 addr64_t
 215 kvtophys(
 216         vm_offset_t addr)
 217 {
 218         pt_entry_t *ptep;
 219         pmap_paddr_t pa;
 220
 221         if ((ptep = pmap_pte(kernel_pmap, (vm_map_offset_t)addr)) == PT_ENTRY_NULL) {
 222                 pa = 0;
 223         } else {
 224                 pa =  pte_to_pa(*ptep) | (addr & INTEL_OFFMASK);
 225         }
 226
 227         return ((addr64_t)pa);
 228 }
 229