osfmk/i386/phys.c

   1 /*
   2  * Copyright (c) 2000-2004 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
  51 #include <mach_rt.h>
  52 #include <mach_debug.h>
  53 #include <mach_ldebug.h>
  54
  55 #include <sys/kdebug.h>
  56
  57 #include <mach/kern_return.h>
  58 #include <mach/thread_status.h>
  59 #include <mach/vm_param.h>
  60
  61 #include <kern/counters.h>
  62 #include <kern/mach_param.h>
  63 #include <kern/task.h>
  64 #include <kern/thread.h>
  65 #include <kern/sched_prim.h>
  66 #include <kern/misc_protos.h>
  67 #include <kern/assert.h>
  68 #include <kern/spl.h>
  69 #include <ipc/ipc_port.h>
  70 #include <vm/vm_kern.h>
  71 #include <vm/vm_map.h>
  72 #include <vm/pmap.h>
  73
  74 #include <i386/cpu_data.h>
  75 #include <i386/cpu_number.h>
  76 #include <i386/thread.h>
  77 #include <i386/eflags.h>
  78 #include <i386/proc_reg.h>
  79 #include <i386/seg.h>
  80 #include <i386/tss.h>
  81 #include <i386/user_ldt.h>
  82 #include <i386/fpu.h>
  83 #include <i386/iopb_entries.h>
  84 #include <i386/misc_protos.h>
  85
  86 /*
  87  *      pmap_zero_page zeros the specified (machine independent) page.
  88  */
  89 void
  90 pmap_zero_page(
  91                ppnum_t pn)
  92 {
  93         assert(pn != vm_page_fictitious_addr);
  94         bzero_phys((addr64_t)i386_ptob(pn), PAGE_SIZE);
  95 }
  96
  97 /*
  98  *      pmap_zero_part_page
  99  *      zeros the specified (machine independent) part of a page.
 100  */
 101 void
 102 pmap_zero_part_page(
 103         ppnum_t         pn,
 104         vm_offset_t     offset,
 105         vm_size_t       len)
 106 {
 107         assert(pn != vm_page_fictitious_addr);
 108         assert(offset + len <= PAGE_SIZE);
 109         bzero_phys((addr64_t)(i386_ptob(pn) + offset), len);
 110 }
 111
 112 /*
 113  *      pmap_copy_page copies the specified (machine independent) pages.
 114  */
 115 void
 116 pmap_copy_part_page(
 117         ppnum_t         psrc,
 118         vm_offset_t     src_offset,
 119         ppnum_t         pdst,
 120         vm_offset_t     dst_offset,
 121         vm_size_t       len)
 122 {
 123         pmap_paddr_t src, dst;
 124
 125         assert(psrc != vm_page_fictitious_addr);
 126         assert(pdst != vm_page_fictitious_addr);
 127
 128         src = i386_ptob(psrc);
 129         dst = i386_ptob(pdst);
 130
 131         assert((((uint32_t)dst & PAGE_MASK) + dst_offset + len) <= PAGE_SIZE);
 132         assert((((uint32_t)src & PAGE_MASK) + src_offset + len) <= PAGE_SIZE);
 133
 134         bcopy_phys((addr64_t)src + (src_offset & INTEL_OFFMASK),
 135                    (addr64_t)dst + (dst_offset & INTEL_OFFMASK),
 136                    len);
 137 }
 138
 139 /*
 140  *      pmap_copy_part_lpage copies part of a virtually addressed page
 141  *      to a physically addressed page.
 142  */
 143 void
 144 pmap_copy_part_lpage(
 145         vm_offset_t     src,
 146         ppnum_t         pdst,
 147         vm_offset_t     dst_offset,
 148         vm_size_t       len)
 149 {
 150         mapwindow_t *map;
 151
 152         assert(pdst != vm_page_fictitious_addr);
 153         assert((dst_offset + len) <= PAGE_SIZE);
 154
 155         mp_disable_preemption();
 156
 157         map = pmap_get_mapwindow(INTEL_PTE_VALID | INTEL_PTE_RW | (i386_ptob(pdst) & PG_FRAME) |
 158                                  INTEL_PTE_REF | INTEL_PTE_MOD);
 159         if (map == 0) {
 160                 panic("pmap_copy_part_lpage");
 161         }
 162         invlpg((uintptr_t)map->prv_CADDR);
 163
 164         memcpy((void *) (map->prv_CADDR + (dst_offset & INTEL_OFFMASK)), (void *) src, len);
 165         *map->prv_CMAP = 0;
 166
 167         mp_enable_preemption();
 168 }
 169
 170 /*
 171  *      pmap_copy_part_rpage copies part of a physically addressed page
 172  *      to a virtually addressed page.
 173  */
 174 void
 175 pmap_copy_part_rpage(
 176         ppnum_t         psrc,
 177         vm_offset_t     src_offset,
 178         vm_offset_t     dst,
 179         vm_size_t       len)
 180 {
 181         mapwindow_t *map;
 182
 183         assert(psrc != vm_page_fictitious_addr);
 184         assert((src_offset + len) <= PAGE_SIZE);
 185
 186         mp_disable_preemption();
 187
 188         map = pmap_get_mapwindow(INTEL_PTE_VALID | INTEL_PTE_RW | (i386_ptob(psrc) & PG_FRAME) |
 189                                  INTEL_PTE_REF);
 190         if (map == 0) {
 191                 panic("pmap_copy_part_rpage");
 192         }
 193         invlpg((uintptr_t) map->prv_CADDR);
 194
 195         memcpy((void *) dst, (void *) (map->prv_CADDR + (src_offset & INTEL_OFFMASK)), len);
 196         *map->prv_CMAP = 0;
 197
 198         mp_enable_preemption();
 199 }
 200
 201 /*
 202  *      kvtophys(addr)
 203  *
 204  *      Convert a kernel virtual address to a physical address
 205  */
 206 addr64_t
 207 kvtophys(
 208         vm_offset_t addr)
 209 {
 210         pt_entry_t *ptep;
 211         pmap_paddr_t pa;
 212
 213         mp_disable_preemption();
 214         if ((ptep = pmap_pte(kernel_pmap, (vm_map_offset_t)addr)) == PT_ENTRY_NULL) {
 215                 pa = 0;
 216         } else {
 217                 pa =  pte_to_pa(*ptep) | (addr & INTEL_OFFMASK);
 218         }
 219         mp_enable_preemption_no_check();
 220         return ((addr64_t)pa);
 221 }
 222