osfmk/i386/phys.c

   1 /*
   2  * Copyright (c) 2000-2012 Apple 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
 160         assert(pdst != vm_page_fictitious_addr);
 161         assert(pdst != vm_page_guard_addr);
 162         assert((dst_offset + len) <= PAGE_SIZE);
 163
 164 }
 165
 166 /*
 167  *      pmap_copy_part_rpage copies part of a physically addressed page
 168  *      to a virtually addressed page.
 169  */
 170 void
 171 pmap_copy_part_rpage(
 172         __unused ppnum_t                psrc,
 173         __unused vm_offset_t    src_offset,
 174         __unused vm_offset_t    dst,
 175         __unused vm_size_t      len)
 176 {
 177
 178         assert(psrc != vm_page_fictitious_addr);
 179         assert(psrc != vm_page_guard_addr);
 180         assert((src_offset + len) <= PAGE_SIZE);
 181
 182 }
 183
 184 /*
 185  *      kvtophys(addr)
 186  *
 187  *      Convert a kernel virtual address to a physical address
 188  */
 189 addr64_t
 190 kvtophys(
 191         vm_offset_t addr)
 192 {
 193         pmap_paddr_t pa;
 194
 195         pa = ((pmap_paddr_t)pmap_find_phys(kernel_pmap, addr)) << INTEL_PGSHIFT;
 196         if (pa)
 197                 pa |= (addr & INTEL_OFFMASK);
 198
 199         return ((addr64_t)pa);
 200 }
 201
 202 extern pt_entry_t *debugger_ptep;
 203 extern vm_map_offset_t debugger_window_kva;
 204 extern int _bcopy(const void *, void *, vm_size_t);
 205 extern int _bcopy2(const void *, void *);
 206 extern int _bcopy4(const void *, void *);
 207 extern int _bcopy8(const void *, void *);
 208
 209 __private_extern__ int ml_copy_phys(addr64_t src64, addr64_t dst64, vm_size_t bytes) {
 210         void *src, *dst;
 211         int err = 0;
 212
 213         mp_disable_preemption();
 214 #if NCOPY_WINDOWS > 0
 215         mapwindow_t *src_map, *dst_map;
 216         /* We rely on MTRRs here */
 217         src_map = pmap_get_mapwindow((pt_entry_t)(INTEL_PTE_VALID | ((pmap_paddr_t)src64 & PG_FRAME) | INTEL_PTE_REF));
 218         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));
 219         src = (void *) ((uintptr_t)src_map->prv_CADDR | ((uint32_t)src64 & INTEL_OFFMASK));
 220         dst = (void *) ((uintptr_t)dst_map->prv_CADDR | ((uint32_t)dst64 & INTEL_OFFMASK));
 221 #elif defined(__x86_64__)
 222         addr64_t debug_pa = 0;
 223
 224         /* If either destination or source are outside the
 225          * physical map, establish a physical window onto the target frame.
 226          */
 227         assert(physmap_enclosed(src64) || physmap_enclosed(dst64));
 228
 229         if (physmap_enclosed(src64) == FALSE) {
 230                 src = (void *)(debugger_window_kva | (src64 & INTEL_OFFMASK));
 231                 dst = PHYSMAP_PTOV(dst64);
 232                 debug_pa = src64 & PG_FRAME;
 233         } else if (physmap_enclosed(dst64) == FALSE) {
 234                 src = PHYSMAP_PTOV(src64);
 235                 dst = (void *)(debugger_window_kva | (dst64 & INTEL_OFFMASK));
 236                 debug_pa = dst64 & PG_FRAME;
 237         } else {
 238                 src = PHYSMAP_PTOV(src64);
 239                 dst = PHYSMAP_PTOV(dst64);
 240         }
 241         /* DRK: debugger only routine, we don't bother checking for an
 242          * identical mapping.
 243          */
 244         if (debug_pa) {
 245                 if (debugger_window_kva == 0)
 246                         panic("%s: invoked in non-debug mode", __FUNCTION__);
 247                 /* Establish a cache-inhibited physical window; some platforms
 248                  * may not cover arbitrary ranges with MTRRs
 249                  */
 250                 pmap_store_pte(debugger_ptep, debug_pa | INTEL_PTE_NCACHE | INTEL_PTE_RW | INTEL_PTE_REF| INTEL_PTE_MOD | INTEL_PTE_VALID);
 251                 flush_tlb_raw();
 252 #if     DEBUG
 253                 kprintf("Remapping debugger physical window at %p to 0x%llx\n", (void *)debugger_window_kva, debug_pa);
 254 #endif
 255         }
 256 #endif
 257         /* ensure we stay within a page */
 258         if (((((uint32_t)src64 & (I386_PGBYTES-1)) + bytes) > I386_PGBYTES) || ((((uint32_t)dst64 & (I386_PGBYTES-1)) + bytes) > I386_PGBYTES) ) {
 259                 panic("ml_copy_phys spans pages, src: 0x%llx, dst: 0x%llx", src64, dst64);
 260         }
 261
 262         /*
 263          * For device register access from the debugger,
 264          * 2-byte/16-bit, 4-byte/32-bit and 8-byte/64-bit copies are handled
 265          * by assembly routines ensuring the required access widths.
 266          * 1-byte and other copies are handled by the regular _bcopy.
 267          */
 268         switch (bytes) {
 269         case 2:
 270                 err = _bcopy2(src, dst);
 271                 break;
 272         case 4:
 273                 err = _bcopy4(src, dst);
 274                 break;
 275         case 8:
 276                 err = _bcopy8(src, dst);
 277                 break;
 278         case 1:
 279         default:
 280                 err = _bcopy(src, dst, bytes);
 281                 break;
 282         }
 283
 284 #if NCOPY_WINDOWS > 0
 285         pmap_put_mapwindow(src_map);
 286         pmap_put_mapwindow(dst_map);
 287 #endif
 288         mp_enable_preemption();
 289
 290         return err;
 291 }