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/misc_protos.h>
  90
  91 /*
  92  *      pmap_zero_page zeros the specified (machine independent) page.
  93  */
  94 void
  95 pmap_zero_page(
  96        ppnum_t pn)
  97 {
  98         assert(pn != vm_page_fictitious_addr);
  99         assert(pn != vm_page_guard_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(pn != vm_page_guard_addr);
 115         assert(offset + len <= PAGE_SIZE);
 116         bzero_phys((addr64_t)(i386_ptob(pn) + offset), (uint32_t)len);
 117 }
 118
 119 /*
 120  *      pmap_copy_page copies the specified (machine independent) pages.
 121  */
 122 void
 123 pmap_copy_part_page(
 124         ppnum_t         psrc,
 125         vm_offset_t     src_offset,
 126         ppnum_t         pdst,
 127         vm_offset_t     dst_offset,
 128         vm_size_t       len)
 129 {
 130         pmap_paddr_t src, dst;
 131
 132         assert(psrc != vm_page_fictitious_addr);
 133         assert(pdst != vm_page_fictitious_addr);
 134         assert(psrc != vm_page_guard_addr);
 135         assert(pdst != vm_page_guard_addr);
 136
 137         src = i386_ptob(psrc);
 138         dst = i386_ptob(pdst);
 139
 140         assert((((uintptr_t)dst & PAGE_MASK) + dst_offset + len) <= PAGE_SIZE);
 141         assert((((uintptr_t)src & PAGE_MASK) + src_offset + len) <= PAGE_SIZE);
 142
 143         bcopy_phys((addr64_t)src + (src_offset & INTEL_OFFMASK),
 144                    (addr64_t)dst + (dst_offset & INTEL_OFFMASK),
 145                    len);
 146 }
 147
 148 /*
 149  *      pmap_copy_part_lpage copies part of a virtually addressed page
 150  *      to a physically addressed page.
 151  */
 152 void
 153 pmap_copy_part_lpage(
 154         __unused vm_offset_t    src,
 155         __unused ppnum_t        pdst,
 156         __unused vm_offset_t    dst_offset,
 157         __unused vm_size_t      len)
 158 {
 159 #ifdef __i386__
 160         mapwindow_t *map;
 161 #endif
 162
 163         assert(pdst != vm_page_fictitious_addr);
 164         assert(pdst != vm_page_guard_addr);
 165         assert((dst_offset + len) <= PAGE_SIZE);
 166
 167 #ifdef __i386__
 168         mp_disable_preemption();
 169
 170         map = pmap_get_mapwindow(INTEL_PTE_VALID | INTEL_PTE_RW | (i386_ptob(pdst) & PG_FRAME) |
 171                                  INTEL_PTE_REF | INTEL_PTE_MOD);
 172
 173         memcpy((void *) (map->prv_CADDR + (dst_offset & INTEL_OFFMASK)), (void *) src, len);
 174
 175         pmap_put_mapwindow(map);
 176
 177         mp_enable_preemption();
 178 #endif
 179 }
 180
 181 /*
 182  *      pmap_copy_part_rpage copies part of a physically addressed page
 183  *      to a virtually addressed page.
 184  */
 185 void
 186 pmap_copy_part_rpage(
 187         __unused ppnum_t                psrc,
 188         __unused vm_offset_t    src_offset,
 189         __unused vm_offset_t    dst,
 190         __unused vm_size_t      len)
 191 {
 192 #ifdef __i386__
 193         mapwindow_t *map;
 194 #endif
 195
 196         assert(psrc != vm_page_fictitious_addr);
 197         assert(psrc != vm_page_guard_addr);
 198         assert((src_offset + len) <= PAGE_SIZE);
 199
 200 #ifdef __i386__
 201         mp_disable_preemption();
 202
 203         map = pmap_get_mapwindow(INTEL_PTE_VALID | INTEL_PTE_RW | (i386_ptob(psrc) & PG_FRAME) |
 204                                  INTEL_PTE_REF);
 205
 206         memcpy((void *) dst, (void *) (map->prv_CADDR + (src_offset & INTEL_OFFMASK)), len);
 207
 208         pmap_put_mapwindow(map);
 209
 210         mp_enable_preemption();
 211 #endif
 212 }
 213
 214 /*
 215  *      kvtophys(addr)
 216  *
 217  *      Convert a kernel virtual address to a physical address
 218  */
 219 addr64_t
 220 kvtophys(
 221         vm_offset_t addr)
 222 {
 223         pmap_paddr_t pa;
 224
 225         pa = ((pmap_paddr_t)pmap_find_phys(kernel_pmap, addr)) << INTEL_PGSHIFT;
 226         if (pa)
 227                 pa |= (addr & INTEL_OFFMASK);
 228
 229         return ((addr64_t)pa);
 230 }
 231
 232 __private_extern__ void ml_copy_phys(addr64_t src64, addr64_t dst64, vm_size_t bytes) {
 233         void *src, *dst;
 234
 235         mp_disable_preemption();
 236 #if NCOPY_WINDOWS > 0
 237         mapwindow_t *src_map, *dst_map;
 238         /* We rely on MTRRs here */
 239         src_map = pmap_get_mapwindow((pt_entry_t)(INTEL_PTE_VALID | ((pmap_paddr_t)src64 & PG_FRAME) | INTEL_PTE_REF));
 240         dst_map = pmap_get_mapwindow((pt_entry_t)(INTEL_PTE_VALID | INTEL_PTE_RW | ((pmap_paddr_t)dst64 & PG_FRAME) | INTEL_PTE_REF | INTEL_PTE_MOD));
 241         src = (void *) ((uintptr_t)src_map->prv_CADDR | ((uint32_t)src64 & INTEL_OFFMASK));
 242         dst = (void *) ((uintptr_t)dst_map->prv_CADDR | ((uint32_t)dst64 & INTEL_OFFMASK));
 243 #elif defined(__x86_64__)
 244         src = PHYSMAP_PTOV(src64);
 245         dst = PHYSMAP_PTOV(dst64);
 246 #endif
 247         /* ensure we stay within a page */
 248         if (((((uint32_t)src64 & (I386_PGBYTES-1)) + bytes) > I386_PGBYTES) || ((((uint32_t)dst64 & (I386_PGBYTES-1)) + bytes) > I386_PGBYTES) ) {
 249                 panic("ml_copy_phys spans pages, src: 0x%llx, dst: 0x%llx", src64, dst64);
 250         }
 251
 252         switch (bytes) {
 253         case 1:
 254                 *((uint8_t *) dst) = *((uint8_t *) src);
 255                 break;
 256         case 2:
 257                 *((uint16_t *) dst) = *((uint16_t *) src);
 258                 break;
 259         case 4:
 260                 *((uint32_t *) dst) = *((uint32_t *) src);
 261                 break;
 262                 /* Should perform two 32-bit reads */
 263         case 8:
 264                 *((uint64_t *) dst) = *((uint64_t *) src);
 265                 break;
 266         default:
 267                 bcopy(src, dst, bytes);
 268                 break;
 269         }
 270 #if NCOPY_WINDOWS > 0
 271         pmap_put_mapwindow(src_map);
 272         pmap_put_mapwindow(dst_map);
 273 #endif
 274         mp_enable_preemption();
 275 }