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         vm_offset_t  src, dst;
 132         assert(psrc != vm_page_fictitious_addr);
 133         assert(pdst != vm_page_fictitious_addr);
 134         src = (vm_offset_t)i386_ptob(psrc);
 135         dst = (vm_offset_t)i386_ptob(pdst);
 136         assert(((dst & PAGE_MASK) + dst_offset + len) <= PAGE_SIZE);
 137         assert(((src & PAGE_MASK) + src_offset + len) <= PAGE_SIZE);
 138         bcopy_phys((addr64_t)src + (src_offset & INTEL_OFFMASK),
 139                    (addr64_t)dst + (dst_offset & INTEL_OFFMASK),
 140                    len);
 141 }
 142
 143 /*
 144  *      pmap_copy_part_lpage copies part of a virtually addressed page
 145  *      to a physically addressed page.
 146  */
 147 void
 148 pmap_copy_part_lpage(
 149         vm_offset_t     src,
 150         ppnum_t         pdst,
 151         vm_offset_t     dst_offset,
 152         vm_size_t       len)
 153 {
 154         pt_entry_t *ptep;
 155         thread_t        thr_act = current_thread();
 156
 157         assert(pdst != vm_page_fictitious_addr);
 158         ptep = pmap_pte(thr_act->map->pmap, i386_ptob(pdst));
 159         if (0 == ptep)
 160                 panic("pmap_copy_part_lpage ptep");
 161         assert(((pdst & PAGE_MASK) + dst_offset + len) <= PAGE_SIZE);
 162         if (*(pt_entry_t *) CM2)
 163           panic("pmap_copy_part_lpage");
 164         *(int *) CM2 = INTEL_PTE_VALID | INTEL_PTE_RW | (*ptep & PG_FRAME) |
 165           INTEL_PTE_REF | INTEL_PTE_MOD;
 166         invlpg((unsigned int) CA2);
 167         memcpy((void *) (CA2 + (dst_offset & INTEL_OFFMASK)), (void *) src, len);
 168         *(pt_entry_t *) CM2 = 0;
 169 }
 170
 171 /*
 172  *      pmap_copy_part_rpage copies part of a physically addressed page
 173  *      to a virtually addressed page.
 174  */
 175 void
 176 pmap_copy_part_rpage(
 177         ppnum_t         psrc,
 178         vm_offset_t     src_offset,
 179         vm_offset_t     dst,
 180         vm_size_t       len)
 181 {
 182   pt_entry_t *ptep;
 183   thread_t thr_act = current_thread();
 184
 185         assert(psrc != vm_page_fictitious_addr);
 186         ptep = pmap_pte(thr_act->map->pmap, i386_ptob(psrc));
 187         if (0 == ptep)
 188                 panic("pmap_copy_part_rpage ptep");
 189         assert(((psrc & PAGE_MASK) + src_offset + len) <= PAGE_SIZE);
 190         if (*(pt_entry_t *) CM2)
 191           panic("pmap_copy_part_rpage");
 192         *(pt_entry_t *) CM2 = INTEL_PTE_VALID | INTEL_PTE_RW | (*ptep & PG_FRAME) |
 193           INTEL_PTE_REF;
 194         invlpg((unsigned int) CA2);
 195         memcpy((void *) dst, (void *) (CA2 + (src_offset & INTEL_OFFMASK)), len);
 196         *(pt_entry_t *) CM2 = 0;
 197 }
 198
 199 /*
 200  *      kvtophys(addr)
 201  *
 202  *      Convert a kernel virtual address to a physical address
 203  */
 204 vm_offset_t
 205 kvtophys(
 206         vm_offset_t addr)
 207 {
 208         pt_entry_t *ptep;
 209         pmap_paddr_t pa;
 210
 211         if ((ptep = pmap_pte(kernel_pmap, addr)) == PT_ENTRY_NULL) {
 212           pa = 0;
 213         } else {
 214           pa =  pte_to_pa(*ptep) | (addr & INTEL_OFFMASK);
 215         }
 216         if (0 == pa)
 217                 kprintf("kvtophys ret 0!\n");
 218         return (pa);
 219 }