osfmk/i386/phys.c

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