osfmk/ppc/commpage/commpage.c

   1 /*
   2  * Copyright (c) 2003-2004 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_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. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 /*
  25  *      Here's what to do if you want to add a new routine to the comm page:
  26  *
  27  *              1. Add a definition for it's address in osfmk/ppc/cpu_capabilities.h,
  28  *                 being careful to reserve room for future expansion.
  29  *
  30  *              2. Write one or more versions of the routine, each with it's own
  31  *                 commpage_descriptor.  The tricky part is getting the "special",
  32  *                 "musthave", and "canthave" fields right, so that exactly one
  33  *                 version of the routine is selected for every machine.
  34  *                 The source files should be in osfmk/ppc/commpage/.
  35  *
  36  *              3. Add a ptr to your new commpage_descriptor(s) in the "routines"
  37  *                 static array below.  Of course, you'll also have to declare them
  38  *                 "extern".
  39  *
  40  *              4. Write the code in Libc to use the new routine.
  41  */
  42
  43 #include <mach/mach_types.h>
  44 #include <mach/machine.h>
  45 #include <mach/vm_map.h>
  46 #include <ppc/exception.h>
  47 #include <ppc/machine_routines.h>
  48 #include <machine/cpu_capabilities.h>
  49 #include <machine/commpage.h>
  50 #include <machine/pmap.h>
  51 #include <vm/vm_kern.h>
  52 #include <vm/vm_map.h>
  53 #include <ipc/ipc_port.h>
  54
  55 extern  vm_map_t        com_region_map32;   // the 32-bit shared submap, set up in vm init
  56 extern  vm_map_t        com_region_map64;   // the 64-bit shared submap
  57
  58 char    *commPagePtr32 = NULL;                  // virtual address of 32-bit comm page in kernel map
  59 char    *commPagePtr64 = NULL;                  // and 64-bit commpage
  60 int             _cpu_capabilities = 0;                  // define the capability vector
  61
  62 static  char    *next;                                  // next available byte in comm page
  63 static  int             cur_routine;                    // comm page address of "current" routine
  64 static  int             matched;                                // true if we've found a match for "current" routine
  65 static  char    *commPagePtr;                   // virtual address in kernel of commpage we are working on
  66
  67 extern  commpage_descriptor     compare_and_swap32_on32;
  68 extern  commpage_descriptor     compare_and_swap32_on64;
  69 extern  commpage_descriptor     compare_and_swap64;
  70 extern  commpage_descriptor     atomic_enqueue32;
  71 extern  commpage_descriptor     atomic_enqueue64;
  72 extern  commpage_descriptor     atomic_dequeue32_on32;
  73 extern  commpage_descriptor     atomic_dequeue32_on64;
  74 extern  commpage_descriptor     atomic_dequeue64;
  75 extern  commpage_descriptor     memory_barrier_up;
  76 extern  commpage_descriptor     memory_barrier_mp32;
  77 extern  commpage_descriptor     memory_barrier_mp64;
  78 extern  commpage_descriptor     atomic_add32;
  79 extern  commpage_descriptor     atomic_add64;
  80 extern  commpage_descriptor     mach_absolute_time_32;
  81 extern  commpage_descriptor     mach_absolute_time_64;
  82 extern  commpage_descriptor     mach_absolute_time_lp64;
  83 extern  commpage_descriptor     spinlock_32_try_mp;
  84 extern  commpage_descriptor     spinlock_32_try_up;
  85 extern  commpage_descriptor     spinlock_64_try_mp;
  86 extern  commpage_descriptor     spinlock_64_try_up;
  87 extern  commpage_descriptor     spinlock_32_lock_mp;
  88 extern  commpage_descriptor     spinlock_32_lock_up;
  89 extern  commpage_descriptor     spinlock_64_lock_mp;
  90 extern  commpage_descriptor     spinlock_64_lock_up;
  91 extern  commpage_descriptor     spinlock_32_unlock_mp;
  92 extern  commpage_descriptor     spinlock_32_unlock_up;
  93 extern  commpage_descriptor     spinlock_64_unlock_mp;
  94 extern  commpage_descriptor     spinlock_64_unlock_up;
  95 extern  commpage_descriptor     pthread_getspecific_sprg3_32;
  96 extern  commpage_descriptor     pthread_getspecific_sprg3_64;
  97 extern  commpage_descriptor     pthread_getspecific_uftrap;
  98 extern  commpage_descriptor     gettimeofday_32;
  99 extern  commpage_descriptor     gettimeofday_g5_32;
 100 extern  commpage_descriptor     gettimeofday_g5_64;
 101 extern  commpage_descriptor     commpage_flush_dcache;
 102 extern  commpage_descriptor     commpage_flush_icache;
 103 extern  commpage_descriptor     pthread_self_sprg3;
 104 extern  commpage_descriptor     pthread_self_uftrap;
 105 extern  commpage_descriptor     spinlock_relinquish;
 106 extern  commpage_descriptor     bzero_32;
 107 extern  commpage_descriptor     bzero_128;
 108 extern  commpage_descriptor     bcopy_g3;
 109 extern  commpage_descriptor     bcopy_g4;
 110 extern  commpage_descriptor     bcopy_970;
 111 extern  commpage_descriptor     bcopy_64;
 112 extern  commpage_descriptor     compare_and_swap32_on32b;
 113 extern  commpage_descriptor     compare_and_swap32_on64b;
 114 extern  commpage_descriptor     compare_and_swap64b;
 115 extern  commpage_descriptor memset_64;
 116 extern  commpage_descriptor memset_g3;
 117 extern  commpage_descriptor memset_g4;
 118 extern  commpage_descriptor memset_g5;
 119 extern  commpage_descriptor     bigcopy_970;
 120
 121 /* The list of all possible commpage routines.  WARNING: the check for overlap
 122  * assumes that these routines are in strictly ascending order, sorted by address
 123  * in the commpage.  We panic if not.
 124  */
 125 static  commpage_descriptor     *routines[] = {
 126     &compare_and_swap32_on32,
 127     &compare_and_swap32_on64,
 128     &compare_and_swap64,
 129     &atomic_enqueue32,
 130     &atomic_enqueue64,
 131     &atomic_dequeue32_on32,
 132     &atomic_dequeue32_on64,
 133     &atomic_dequeue64,
 134     &memory_barrier_up,
 135     &memory_barrier_mp32,
 136     &memory_barrier_mp64,
 137     &atomic_add32,
 138     &atomic_add64,
 139     &mach_absolute_time_32,
 140     &mach_absolute_time_64,
 141     &mach_absolute_time_lp64,
 142     &spinlock_32_try_mp,
 143     &spinlock_32_try_up,
 144     &spinlock_64_try_mp,
 145     &spinlock_64_try_up,
 146     &spinlock_32_lock_mp,
 147     &spinlock_32_lock_up,
 148     &spinlock_64_lock_mp,
 149     &spinlock_64_lock_up,
 150     &spinlock_32_unlock_mp,
 151     &spinlock_32_unlock_up,
 152     &spinlock_64_unlock_mp,
 153     &spinlock_64_unlock_up,
 154     &pthread_getspecific_sprg3_32,
 155     &pthread_getspecific_sprg3_64,
 156     &pthread_getspecific_uftrap,
 157     &gettimeofday_32,
 158     &gettimeofday_g5_32,
 159     &gettimeofday_g5_64,
 160     &commpage_flush_dcache,
 161     &commpage_flush_icache,
 162     &pthread_self_sprg3,
 163     &pthread_self_uftrap,
 164     &spinlock_relinquish,
 165     &bzero_32,
 166     &bzero_128,
 167     &bcopy_g3,
 168     &bcopy_g4,
 169     &bcopy_970,
 170     &bcopy_64,
 171     &compare_and_swap32_on32b,
 172     &compare_and_swap32_on64b,
 173     &compare_and_swap64b,
 174     &memset_64,
 175     &memset_g3,
 176     &memset_g4,
 177     &memset_g5,
 178     &bigcopy_970,
 179     NULL };
 180
 181
 182 /* Allocate the commpages and add to one of the shared submaps created by vm.
 183  * Called once each for the 32 and 64-bit submaps.
 184  *      1. allocate pages in the kernel map (RW)
 185  *      2. wire them down
 186  *      3. make a memory entry out of them
 187  *      4. map that entry into the shared comm region map (R-only)
 188  */
 189 static  void*
 190 commpage_allocate(
 191         vm_map_t                        submap )                                        // com_region_map32 or com_region_map64
 192 {
 193     vm_offset_t                 kernel_addr;                            // address of commpage in kernel map
 194     vm_offset_t                 zero = 0;
 195     vm_size_t                   size = _COMM_PAGE_AREA_USED;    // size actually populated
 196     vm_map_entry_t              entry;
 197     ipc_port_t                  handle;
 198
 199     if (submap == NULL)
 200         panic("commpage submap is null");
 201
 202     if (vm_allocate(kernel_map,&kernel_addr,_COMM_PAGE_AREA_USED,VM_FLAGS_ANYWHERE))
 203         panic("cannot allocate commpage");
 204
 205     if (vm_map_wire(kernel_map,kernel_addr,kernel_addr+_COMM_PAGE_AREA_USED,VM_PROT_DEFAULT,FALSE))
 206         panic("cannot wire commpage");
 207
 208     /*
 209      * Now that the object is created and wired into the kernel map, mark it so that no delay
 210      * copy-on-write will ever be performed on it as a result of mapping it into user-space.
 211      * If such a delayed copy ever occurred, we could remove the kernel's wired mapping - and
 212      * that would be a real disaster.
 213      *
 214      * JMM - What we really need is a way to create it like this in the first place.
 215      */
 216     if (!vm_map_lookup_entry( kernel_map, vm_map_trunc_page(kernel_addr), &entry) || entry->is_sub_map)
 217         panic("cannot find commpage entry");
 218     entry->object.vm_object->copy_strategy = MEMORY_OBJECT_COPY_NONE;
 219
 220     if (mach_make_memory_entry( kernel_map,                     // target map
 221                                 &size,                          // size
 222                                 kernel_addr,            // offset (address in kernel map)
 223                                 VM_PROT_DEFAULT,        // map it RW
 224                                 &handle,                        // this is the object handle we get
 225                                 NULL ))                         // parent_entry
 226         panic("cannot make entry for commpage");
 227
 228     if (vm_map_64(      submap,                                                 // target map (shared submap)
 229                     &zero,                                                      // address (map into 1st page in submap)
 230                     _COMM_PAGE_AREA_USED,                       // size
 231                     0,                                                          // mask
 232                     VM_FLAGS_FIXED,                                     // flags (it must be 1st page in submap)
 233                     handle,                                                     // port is the memory entry we just made
 234                     0,                                                          // offset (map 1st page in memory entry)
 235                     FALSE,                                                      // copy
 236                     VM_PROT_READ,                                       // cur_protection (R-only in user map)
 237                     VM_PROT_READ,                                       // max_protection
 238                     VM_INHERIT_SHARE ))                         // inheritance
 239         panic("cannot map commpage");
 240
 241     ipc_port_release(handle);
 242
 243     return (void*) kernel_addr;                                         // return address in kernel map
 244 }
 245
 246
 247 /* Get address (in kernel map) of a commpage field. */
 248
 249 static  void*
 250 commpage_addr_of(
 251     int         addr_at_runtime )
 252 {
 253     return      (void*) (commPagePtr + addr_at_runtime - _COMM_PAGE_BASE_ADDRESS);
 254 }
 255
 256
 257 /* Determine number of CPUs on this system.  We cannot rely on
 258  * machine_info.max_cpus this early in the boot.
 259  */
 260 static int
 261 commpage_cpus( void )
 262 {
 263     int         cpus;
 264
 265     cpus = ml_get_max_cpus();                   // NB: this call can block
 266
 267     if (cpus == 0)
 268         panic("commpage cpus==0");
 269     if (cpus > 0xFF)
 270         cpus = 0xFF;
 271
 272     return      cpus;
 273 }
 274
 275
 276 /* Initialize kernel version of _cpu_capabilities vector (used by KEXTs.) */
 277
 278 static void
 279 commpage_init_cpu_capabilities( void )
 280 {
 281     procFeatures        *pfp;
 282     int cpus;
 283     int available;
 284
 285     pfp = &(PerProcTable[0].ppe_vaddr->pf);                     // point to features in per-proc
 286     available = pfp->Available;
 287
 288     // If AltiVec is disabled make sure it is not reported as available.
 289     if ((available & pfAltivec) == 0) {
 290         _cpu_capabilities &= ~kHasAltivec;
 291     }
 292
 293     if (_cpu_capabilities & kDcbaAvailable) {           // if this processor has DCBA, time it...
 294         _cpu_capabilities |= commpage_time_dcba();      // ...and set kDcbaRecomended if it helps.
 295     }
 296
 297     cpus = commpage_cpus();                         // how many CPUs do we have
 298     if (cpus == 1) _cpu_capabilities |= kUP;
 299     _cpu_capabilities |= (cpus << kNumCPUsShift);
 300
 301     if (_cpu_capabilities & k64Bit)                 // 64-bit processors use SPRG3 for TLS
 302         _cpu_capabilities |= kFastThreadLocalStorage;
 303 }
 304
 305
 306 /* Copy data into commpage. */
 307
 308 static void
 309 commpage_stuff(
 310     int         address,
 311     const void  *source,
 312     int         length  )
 313 {
 314     char        *dest = commpage_addr_of(address);
 315
 316     if (dest < next)
 317         panic("commpage overlap: %08 - %08X", dest, next);
 318
 319     bcopy((const char*)source,dest,length);
 320
 321     next = (dest + length);
 322 }
 323
 324
 325 /* Modify commpage code in-place for this specific platform. */
 326
 327 static void
 328 commpage_change(
 329     uint32_t    *ptr,
 330     int                 bytes,
 331     uint32_t    search_mask,
 332     uint32_t    search_pattern,
 333     uint32_t    new_mask,
 334     uint32_t    new_pattern,
 335     int                 (*check)(uint32_t instruction)  )
 336 {
 337     int                 words = bytes >> 2;
 338     uint32_t    word;
 339
 340     while( (--words) >= 0 ) {
 341         word = *ptr;
 342         if ((word & search_mask)==search_pattern) {
 343             if ((check==NULL) || (check(word))) {       // check instruction if necessary
 344                 word &= ~new_mask;
 345                 word |= new_pattern;
 346                 *ptr = word;
 347             }
 348         }
 349         ptr++;
 350     }
 351 }
 352
 353
 354 /* Check to see if exactly one bit is set in a MTCRF instruction's FXM field.
 355  */
 356 static int
 357 commpage_onebit(
 358     uint32_t    mtcrf )
 359 {
 360     int x = (mtcrf >> 12) & 0xFF;               // isolate the FXM field of the MTCRF
 361
 362     if (x==0)
 363         panic("commpage bad mtcrf");
 364
 365     return      (x & (x-1))==0 ? 1 : 0;         // return 1 iff exactly 1 bit set in FXM field
 366 }
 367
 368
 369 /* Check to see if a RLWINM (whose ME is 31) is a SRWI.  Since to shift right n bits
 370  * you must "RLWINM ra,rs,32-n,n,31", if (SH+MB)==32 then we have a SRWI.
 371  */
 372 static int
 373 commpage_srwi(
 374         uint32_t        rlwinm )
 375 {
 376         int                     sh = (rlwinm >> 11) & 0x1F;             // extract SH field of RLWINM, ie bits 16-20
 377         int                     mb = (rlwinm >> 6 ) & 0x1F;             // extract MB field of RLWINM, ie bits 21-25
 378
 379         return  (sh + mb) == 32;                                        // it is a SRWI if (SH+MB)==32
 380 }
 381
 382
 383 /* Handle kCommPageDCBA bit: the commpage routine uses DCBA.  If the machine we're
 384  * running on doesn't benefit from use of that instruction, map them to NOPs
 385  * in the commpage.
 386  */
 387 static void
 388 commpage_handle_dcbas(
 389     int         address,
 390     int         length  )
 391 {
 392     uint32_t    *ptr, search_mask, search, replace_mask, replace;
 393
 394     if ( (_cpu_capabilities & kDcbaRecommended) == 0 ) {
 395         ptr = commpage_addr_of(address);
 396
 397         search_mask =   0xFC0007FE;             // search x-form opcode bits
 398         search =                0x7C0005EC;             // for a DCBA
 399         replace_mask =  0xFFFFFFFF;             // replace all bits...
 400         replace =               0x60000000;             // ...with a NOP
 401
 402         commpage_change(ptr,length,search_mask,search,replace_mask,replace,NULL);
 403     }
 404 }
 405
 406
 407 /* Handle kCommPageSYNC bit: this routine uses SYNC, LWSYNC, or EIEIO.  If we're
 408  * running on a UP machine, map them to NOPs.
 409  */
 410 static void
 411 commpage_handle_syncs(
 412     int         address,
 413     int         length  )
 414 {
 415     uint32_t    *ptr, search_mask, search, replace_mask, replace;
 416
 417     if (_NumCPUs() == 1) {
 418         ptr = commpage_addr_of(address);
 419
 420         search_mask =   0xFC0005FE;             // search x-form opcode bits (but ignore bit 0x00000200)
 421         search =                0x7C0004AC;             // for a SYNC, LWSYNC, or EIEIO
 422         replace_mask =  0xFFFFFFFF;             // replace all bits...
 423         replace =               0x60000000;             // ...with a NOP
 424
 425         commpage_change(ptr,length,search_mask,search,replace_mask,replace,NULL);
 426     }
 427 }
 428
 429
 430 /* Handle kCommPageISYNC bit: this routine uses ISYNCs.  If we're running on a UP machine,
 431  * map them to NOPs.
 432  */
 433 static void
 434 commpage_handle_isyncs(
 435     int         address,
 436     int         length  )
 437 {
 438     uint32_t    *ptr, search_mask, search, replace_mask, replace;
 439
 440     if (_NumCPUs() == 1) {
 441         ptr = commpage_addr_of(address);
 442
 443         search_mask =   0xFC0007FE;             // search xl-form opcode bits
 444         search =                0x4C00012C;             // for an ISYNC
 445         replace_mask =  0xFFFFFFFF;             // replace all bits...
 446         replace =               0x60000000;             // ...with a NOP
 447
 448         commpage_change(ptr,length,search_mask,search,replace_mask,replace,NULL);
 449     }
 450 }
 451
 452
 453 /* Handle kCommPageMTCRF bit.  When this was written (3/03), the assembler did not
 454  * recognize the special form of MTCRF instructions, in which exactly one bit is set
 455  * in the 8-bit mask field.  Bit 11 of the instruction should be set in this case,
 456  * since the 970 and probably other 64-bit processors optimize it.  Once the assembler
 457  * has been updated this code can be removed, though it need not be.
 458  */
 459 static void
 460 commpage_handle_mtcrfs(
 461     int         address,
 462     int         length  )
 463 {
 464     uint32_t    *ptr, search_mask, search, replace_mask, replace;
 465
 466     if (_cpu_capabilities & k64Bit) {
 467         ptr = commpage_addr_of(address);
 468
 469         search_mask =   0xFC0007FE;             // search x-form opcode bits
 470         search =                0x7C000120;             // for a MTCRF
 471         replace_mask =  0x00100000;             // replace bit 11...
 472         replace =               0x00100000;             // ...with a 1-bit
 473
 474         commpage_change(ptr,length,search_mask,search,replace_mask,replace,commpage_onebit);
 475     }
 476 }
 477
 478
 479 /* Port 32-bit code to 64-bit for use in the 64-bit commpage.  This sounds fancier than
 480  * it is.  We do the following:
 481  *              - map "cmpw*" into "cmpd*"
 482  *              - map "srwi" into "srdi"
 483  * Perhaps surprisingly, this is enough to permit lots of code to run in 64-bit mode, as
 484  * long as it is written with this in mind.
 485  */
 486 static void
 487 commpage_port_32_to_64(
 488     int         address,
 489     int         length  )
 490 {
 491     uint32_t    *ptr, search_mask, search, replace_mask, replace;
 492
 493         ptr = commpage_addr_of(address);
 494
 495         search_mask =   0xFC2007FE;             // search x-form opcode bits (and L bit)
 496         search =                0x7C000000;             // for a CMPW
 497         replace_mask =  0x00200000;             // replace bit 10 (L)...
 498         replace =               0x00200000;             // ...with a 1-bit, converting word to doubleword compares
 499         commpage_change(ptr,length,search_mask,search,replace_mask,replace,NULL);
 500
 501         search_mask =   0xFC2007FE;             // search x-form opcode bits (and L bit)
 502         search =                0x7C000040;             // for a CMPLW
 503         replace_mask =  0x00200000;             // replace bit 10 (L)...
 504         replace =               0x00200000;             // ...with a 1-bit, converting word to doubleword compares
 505         commpage_change(ptr,length,search_mask,search,replace_mask,replace,NULL);
 506
 507         search_mask =   0xFC200000;             // search d-form opcode bits (and L bit)
 508         search =                0x28000000;             // for a CMPLWI
 509         replace_mask =  0x00200000;             // replace bit 10 (L)...
 510         replace =               0x00200000;             // ...with a 1-bit, converting word to doubleword compares
 511         commpage_change(ptr,length,search_mask,search,replace_mask,replace,NULL);
 512
 513         search_mask =   0xFC200000;             // search d-form opcode bits (and L bit)
 514         search =                0x2C000000;             // for a CMPWI
 515         replace_mask =  0x00200000;             // replace bit 10 (L)...
 516         replace =               0x00200000;             // ...with a 1-bit, converting word to doubleword compares
 517         commpage_change(ptr,length,search_mask,search,replace_mask,replace,NULL);
 518
 519         search_mask =   0xFC00003E;             // search d-form opcode bits and ME (mask end) field
 520         search =                0x5400003E;             // for an RLWINM with ME=31 (which might be a "srwi")
 521         replace_mask =  0xFC00003E;             // then replace RLWINM's opcode and ME field to make a RLDICL
 522         replace =               0x78000002;             // opcode is 30, ME is 0, except we add 32 to SH amount
 523         commpage_change(ptr,length,search_mask,search,replace_mask,replace,commpage_srwi);
 524 }
 525
 526
 527 /* Copy a routine into comm page if it matches running machine.
 528  */
 529 static void
 530 commpage_stuff_routine(
 531     commpage_descriptor *rd,
 532         int                                     mode )                          // kCommPage32 or kCommPage64
 533 {
 534     char        *routine_code;
 535     int         must,cant;
 536
 537         if ( (rd->special & mode) == 0 )                // is this routine useable in this mode?
 538                 return;
 539
 540     if (rd->commpage_address != cur_routine) {
 541         if ((cur_routine!=0) && (matched==0))
 542             panic("commpage no match for last, next address %08x", rd->commpage_address);
 543         cur_routine = rd->commpage_address;
 544         matched = 0;
 545     }
 546
 547     must = _cpu_capabilities & rd->musthave;
 548     cant = _cpu_capabilities & rd->canthave;
 549
 550     if ((must == rd->musthave) && (cant == 0)) {
 551         if (matched)
 552             panic("commpage multiple matches for address %08x", rd->commpage_address);
 553         matched = 1;
 554         routine_code = ((char*)rd) + rd->code_offset;
 555
 556         commpage_stuff(rd->commpage_address,routine_code,rd->code_length);
 557
 558         if (rd->special & kCommPageDCBA)
 559             commpage_handle_dcbas(rd->commpage_address,rd->code_length);
 560
 561         if (rd->special & kCommPageSYNC)
 562             commpage_handle_syncs(rd->commpage_address,rd->code_length);
 563
 564         if (rd->special & kCommPageISYNC)
 565             commpage_handle_isyncs(rd->commpage_address,rd->code_length);
 566
 567         if (rd->special & kCommPageMTCRF)
 568             commpage_handle_mtcrfs(rd->commpage_address,rd->code_length);
 569
 570                 if ((mode == kCommPage64) && (rd->special & kPort32to64))
 571                         commpage_port_32_to_64(rd->commpage_address,rd->code_length);
 572     }
 573 }
 574
 575
 576 /* Fill in the 32- or 64-bit commpage.  Called once for each.  */
 577
 578 static void
 579 commpage_populate_one(
 580         vm_map_t        submap,                 // the map to populate
 581         char    **  kernAddressPtr,     // address within kernel of this commpage
 582         int                     mode,           // either kCommPage32 or kCommPage64
 583     const char* signature )     // "commpage 32-bit" or "commpage 64-bit"
 584 {
 585     char        c1;
 586     short       c2;
 587     addr64_t c8;
 588     static double       two52 = 1048576.0 * 1048576.0 * 4096.0; // 2**52
 589     static double       ten6 = 1000000.0;                                               // 10**6
 590     static uint64_t magicFE = 0xFEFEFEFEFEFEFEFFLL;         // used to find 0s in strings
 591     static uint64_t magic80 = 0x8080808080808080LL;         // also used to find 0s
 592     commpage_descriptor **rd;
 593     short       version = _COMM_PAGE_THIS_VERSION;
 594
 595     next = NULL;                                                                // initialize next available byte in the commpage
 596         cur_routine = 0;                                                        // initialize comm page address of "current" routine
 597
 598     commPagePtr = (char*) commpage_allocate( submap );
 599     *kernAddressPtr = commPagePtr;                              // save address either in commPagePtr32 or 64
 600
 601     /* Stuff in the constants.  We move things into the comm page in strictly
 602      * ascending order, so we can check for overlap and panic if so.
 603      */
 604
 605     commpage_stuff(_COMM_PAGE_SIGNATURE,signature,strlen(signature));
 606
 607     commpage_stuff(_COMM_PAGE_VERSION,&version,2);
 608
 609     commpage_stuff(_COMM_PAGE_CPU_CAPABILITIES,&_cpu_capabilities,sizeof(int));
 610
 611     c1 = (_cpu_capabilities & kHasAltivec) ? -1 : 0;
 612     commpage_stuff(_COMM_PAGE_ALTIVEC,&c1,1);
 613
 614     c1 = (_cpu_capabilities & k64Bit) ? -1 : 0;
 615     commpage_stuff(_COMM_PAGE_64_BIT,&c1,1);
 616
 617     if (_cpu_capabilities & kCache32)
 618         c2 = 32;
 619     else if (_cpu_capabilities & kCache64)
 620         c2 = 64;
 621     else if (_cpu_capabilities & kCache128)
 622         c2 = 128;
 623     commpage_stuff(_COMM_PAGE_CACHE_LINESIZE,&c2,2);
 624
 625     commpage_stuff(_COMM_PAGE_2_TO_52,&two52,8);
 626     commpage_stuff(_COMM_PAGE_10_TO_6,&ten6,8);
 627     commpage_stuff(_COMM_PAGE_MAGIC_FE,&magicFE,8);
 628     commpage_stuff(_COMM_PAGE_MAGIC_80,&magic80,8);
 629
 630     c8 = 0;                                                                                                     // 0 timestamp means "disabled"
 631     commpage_stuff(_COMM_PAGE_TIMEBASE,&c8,8);
 632     commpage_stuff(_COMM_PAGE_TIMESTAMP,&c8,8);
 633     commpage_stuff(_COMM_PAGE_SEC_PER_TICK,&c8,8);
 634
 635     /* Now the routines.  We try each potential routine in turn,
 636      * and copy in any that "match" the platform we are running on.
 637      * We require that exactly one routine match for each slot in the
 638      * comm page, and panic if not.
 639      */
 640
 641     for( rd = routines; *rd != NULL ; rd++ )
 642         commpage_stuff_routine(*rd,mode);
 643
 644     if (!matched)
 645         panic("commpage no match on last routine");
 646
 647     if (next > (commPagePtr + _COMM_PAGE_AREA_USED))
 648         panic("commpage overflow");
 649
 650
 651         // make all that new code executable
 652
 653     sync_cache_virtual((vm_offset_t) commPagePtr,_COMM_PAGE_AREA_USED);
 654 }
 655
 656
 657 /* Fill in commpage: called once, during kernel initialization, from the
 658  * startup thread before user-mode code is running.
 659  *
 660  * See the top of this file for a list of what you have to do to add
 661  * a new routine to the commpage.
 662  */
 663
 664 void
 665 commpage_populate( void )
 666 {
 667     commpage_init_cpu_capabilities();
 668         commpage_populate_one( com_region_map32, &commPagePtr32, kCommPage32, "commpage 32-bit");
 669         if (_cpu_capabilities & k64Bit) {
 670                 commpage_populate_one( com_region_map64, &commPagePtr64, kCommPage64, "commpage 64-bit");
 671                 pmap_init_sharedpage((vm_offset_t)commPagePtr64);                       // Do the 64-bit version
 672         }
 673
 674 }