osfmk/vm/pmap.h

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  31 /*
  32  * Mach Operating System
  33  * Copyright (c) 1991,1990,1989,1988,1987 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
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  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
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  53  * any improvements or extensions that they make and grant Carnegie Mellon
  54  * the rights to redistribute these changes.
  55  */
  56 /*
  57  */
  58 /*
  59  *      File:   vm/pmap.h
  60  *      Author: Avadis Tevanian, Jr.
  61  *      Date:   1985
  62  *
  63  *      Machine address mapping definitions -- machine-independent
  64  *      section.  [For machine-dependent section, see "machine/pmap.h".]
  65  */
  66
  67 #ifndef _VM_PMAP_H_
  68 #define _VM_PMAP_H_
  69
  70 #include <mach/kern_return.h>
  71 #include <mach/vm_param.h>
  72 #include <mach/vm_types.h>
  73 #include <mach/vm_attributes.h>
  74 #include <mach/boolean.h>
  75 #include <mach/vm_prot.h>
  76
  77 #ifdef  KERNEL_PRIVATE
  78
  79 /*
  80  *      The following is a description of the interface to the
  81  *      machine-dependent "physical map" data structure.  The module
  82  *      must provide a "pmap_t" data type that represents the
  83  *      set of valid virtual-to-physical addresses for one user
  84  *      address space.  [The kernel address space is represented
  85  *      by a distinguished "pmap_t".]  The routines described manage
  86  *      this type, install and update virtual-to-physical mappings,
  87  *      and perform operations on physical addresses common to
  88  *      many address spaces.
  89  */
  90
  91 /* Copy between a physical page and a virtual address */
  92 /* LP64todo - switch to vm_map_offset_t when it grows */
  93 extern kern_return_t    copypv(
  94                                 addr64_t source,
  95                                 addr64_t sink,
  96                                 unsigned int size,
  97                                 int which);
  98 #define cppvPsnk        1
  99 #define cppvPsnkb      31
 100 #define cppvPsrc        2
 101 #define cppvPsrcb      30
 102 #define cppvFsnk        4
 103 #define cppvFsnkb      29
 104 #define cppvFsrc        8
 105 #define cppvFsrcb      28
 106 #define cppvNoModSnk   16
 107 #define cppvNoModSnkb  27
 108 #define cppvNoRefSrc   32
 109 #define cppvNoRefSrcb  26
 110 #define cppvKmap       64       /* Use the kernel's vm_map */
 111 #define cppvKmapb      25
 112
 113 #ifdef  MACH_KERNEL_PRIVATE
 114
 115 #include <machine/pmap.h>
 116
 117 /*
 118  *      Routines used for initialization.
 119  *      There is traditionally also a pmap_bootstrap,
 120  *      used very early by machine-dependent code,
 121  *      but it is not part of the interface.
 122  *
 123  *      LP64todo -
 124  *      These interfaces are tied to the size of the
 125  *      kernel pmap - and therefore use the "local"
 126  *      vm_offset_t, etc... types.
 127  */
 128
 129 extern void             *pmap_steal_memory(vm_size_t size);
 130                                                 /* During VM initialization,
 131                                                  * steal a chunk of memory.
 132                                                  */
 133 extern unsigned int     pmap_free_pages(void);  /* During VM initialization,
 134                                                  * report remaining unused
 135                                                  * physical pages.
 136                                                  */
 137 extern void             pmap_startup(
 138                                 vm_offset_t *startp,
 139                                 vm_offset_t *endp);
 140                                                 /* During VM initialization,
 141                                                  * use remaining physical pages
 142                                                  * to allocate page frames.
 143                                                  */
 144 extern void             pmap_init(void) __attribute__((section("__TEXT, initcode")));
 145                                                 /* Initialization,
 146                                                  * after kernel runs
 147                                                  * in virtual memory.
 148                                                  */
 149
 150 extern void             mapping_adjust(void);   /* Adjust free mapping count */
 151
 152 extern void             mapping_free_prime(void); /* Primes the mapping block release list */
 153
 154 #ifndef MACHINE_PAGES
 155 /*
 156  *      If machine/pmap.h defines MACHINE_PAGES, it must implement
 157  *      the above functions.  The pmap module has complete control.
 158  *      Otherwise, it must implement
 159  *              pmap_free_pages
 160  *              pmap_virtual_space
 161  *              pmap_next_page
 162  *              pmap_init
 163  *      and vm/vm_resident.c implements pmap_steal_memory and pmap_startup
 164  *      using pmap_free_pages, pmap_next_page, pmap_virtual_space,
 165  *      and pmap_enter.  pmap_free_pages may over-estimate the number
 166  *      of unused physical pages, and pmap_next_page may return FALSE
 167  *      to indicate that there are no more unused pages to return.
 168  *      However, for best performance pmap_free_pages should be accurate.
 169  */
 170
 171 extern boolean_t        pmap_next_page(ppnum_t *pnum);
 172 extern boolean_t        pmap_next_page_hi(ppnum_t *pnum);
 173                                                 /* During VM initialization,
 174                                                  * return the next unused
 175                                                  * physical page.
 176                                                  */
 177 extern void             pmap_virtual_space(
 178                                         vm_offset_t     *virtual_start,
 179                                         vm_offset_t     *virtual_end);
 180                                                 /* During VM initialization,
 181                                                  * report virtual space
 182                                                  * available for the kernel.
 183                                                  */
 184 #endif  /* MACHINE_PAGES */
 185
 186 /*
 187  *      Routines to manage the physical map data structure.
 188  */
 189 extern pmap_t           pmap_create(    /* Create a pmap_t. */
 190                                 vm_map_size_t   size,
 191 #ifdef __i386__
 192                                 boolean_t       is_64bit);
 193 #else
 194                                 __unused boolean_t      is_64bit);
 195 #endif
 196 extern pmap_t           (pmap_kernel)(void);    /* Return the kernel's pmap */
 197 extern void             pmap_reference(pmap_t pmap);    /* Gain a reference. */
 198 extern void             pmap_destroy(pmap_t pmap); /* Release a reference. */
 199 extern void             pmap_switch(pmap_t);
 200
 201
 202 extern void             pmap_enter(     /* Enter a mapping */
 203                                 pmap_t          pmap,
 204                                 vm_map_offset_t v,
 205                                 ppnum_t         pn,
 206                                 vm_prot_t       prot,
 207                                 unsigned int    flags,
 208                                 boolean_t       wired);
 209
 210 extern kern_return_t    pmap_enter_options(
 211                                            pmap_t pmap,
 212                                            vm_map_offset_t v,
 213                                            ppnum_t pn,
 214                                            vm_prot_t prot,
 215                                            unsigned int flags,
 216                                            boolean_t wired,
 217                                            unsigned int options);
 218
 219 extern void             pmap_remove_some_phys(
 220                                 pmap_t          pmap,
 221                                 ppnum_t         pn);
 222
 223
 224 /*
 225  *      Routines that operate on physical addresses.
 226  */
 227
 228 extern void             pmap_page_protect(      /* Restrict access to page. */
 229                                 ppnum_t phys,
 230                                 vm_prot_t       prot);
 231
 232 extern void             (pmap_zero_page)(
 233                                 ppnum_t         pn);
 234
 235 extern void             (pmap_zero_part_page)(
 236                                 ppnum_t         pn,
 237                                 vm_offset_t     offset,
 238                                 vm_size_t       len);
 239
 240 extern void             (pmap_copy_page)(
 241                                 ppnum_t         src,
 242                                 ppnum_t         dest);
 243
 244 extern void             (pmap_copy_part_page)(
 245                                 ppnum_t         src,
 246                                 vm_offset_t     src_offset,
 247                                 ppnum_t         dst,
 248                                 vm_offset_t     dst_offset,
 249                                 vm_size_t       len);
 250
 251 extern void             (pmap_copy_part_lpage)(
 252                                 vm_offset_t     src,
 253                                 ppnum_t         dst,
 254                                 vm_offset_t     dst_offset,
 255                                 vm_size_t       len);
 256
 257 extern void             (pmap_copy_part_rpage)(
 258                                 ppnum_t         src,
 259                                 vm_offset_t     src_offset,
 260                                 vm_offset_t     dst,
 261                                 vm_size_t       len);
 262
 263 extern unsigned int (pmap_disconnect)(  /* disconnect mappings and return reference and change */
 264                                 ppnum_t         phys);
 265
 266 extern kern_return_t    (pmap_attribute_cache_sync)(  /* Flush appropriate
 267                                                        * cache based on
 268                                                        * page number sent */
 269                                 ppnum_t         pn,
 270                                 vm_size_t       size,
 271                                 vm_machine_attribute_t attribute,
 272                                 vm_machine_attribute_val_t* value);
 273
 274 extern unsigned int     (pmap_cache_attributes)(
 275                                 ppnum_t         pn);
 276
 277 extern void pmap_sync_page_data_phys(ppnum_t pa);
 278 extern void pmap_sync_page_attributes_phys(ppnum_t pa);
 279
 280 /*
 281  * debug/assertions. pmap_verify_free returns true iff
 282  * the given physical page is mapped into no pmap.
 283  */
 284 extern boolean_t        pmap_verify_free(ppnum_t pn);
 285
 286 /*
 287  *      Statistics routines
 288  */
 289 extern int              (pmap_resident_count)(pmap_t pmap);
 290 extern int              (pmap_resident_max)(pmap_t pmap);
 291
 292 /*
 293  *      Sundry required (internal) routines
 294  */
 295 #ifdef CURRENTLY_UNUSED_AND_UNTESTED
 296 extern void             pmap_collect(pmap_t pmap);/* Perform garbage
 297                                                  * collection, if any */
 298 #endif
 299 /*
 300  *      Optional routines
 301  */
 302 extern void             (pmap_copy)(            /* Copy range of mappings,
 303                                                  * if desired. */
 304                                 pmap_t          dest,
 305                                 pmap_t          source,
 306                                 vm_map_offset_t dest_va,
 307                                 vm_map_size_t   size,
 308                                 vm_map_offset_t source_va);
 309
 310 extern kern_return_t    (pmap_attribute)(       /* Get/Set special memory
 311                                                  * attributes */
 312                                 pmap_t          pmap,
 313                                 vm_map_offset_t va,
 314                                 vm_map_size_t   size,
 315                                 vm_machine_attribute_t  attribute,
 316                                 vm_machine_attribute_val_t* value);
 317
 318 /*
 319  * Routines defined as macros.
 320  */
 321 #ifndef PMAP_ACTIVATE_USER
 322 #ifndef PMAP_ACTIVATE
 323 #define PMAP_ACTIVATE_USER(thr, cpu)
 324 #else   /* PMAP_ACTIVATE */
 325 #define PMAP_ACTIVATE_USER(thr, cpu) {                  \
 326         pmap_t  pmap;                                           \
 327                                                                 \
 328         pmap = (thr)->map->pmap;                                \
 329         if (pmap != pmap_kernel())                              \
 330                 PMAP_ACTIVATE(pmap, (thr), (cpu));              \
 331 }
 332 #endif  /* PMAP_ACTIVATE */
 333 #endif  /* PMAP_ACTIVATE_USER */
 334
 335 #ifndef PMAP_DEACTIVATE_USER
 336 #ifndef PMAP_DEACTIVATE
 337 #define PMAP_DEACTIVATE_USER(thr, cpu)
 338 #else   /* PMAP_DEACTIVATE */
 339 #define PMAP_DEACTIVATE_USER(thr, cpu) {                        \
 340         pmap_t  pmap;                                           \
 341                                                                 \
 342         pmap = (thr)->map->pmap;                                \
 343         if ((pmap) != pmap_kernel())                    \
 344                 PMAP_DEACTIVATE(pmap, (thr), (cpu));    \
 345 }
 346 #endif  /* PMAP_DEACTIVATE */
 347 #endif  /* PMAP_DEACTIVATE_USER */
 348
 349 #ifndef PMAP_ACTIVATE_KERNEL
 350 #ifndef PMAP_ACTIVATE
 351 #define PMAP_ACTIVATE_KERNEL(cpu)
 352 #else   /* PMAP_ACTIVATE */
 353 #define PMAP_ACTIVATE_KERNEL(cpu)                       \
 354                 PMAP_ACTIVATE(pmap_kernel(), THREAD_NULL, cpu)
 355 #endif  /* PMAP_ACTIVATE */
 356 #endif  /* PMAP_ACTIVATE_KERNEL */
 357
 358 #ifndef PMAP_DEACTIVATE_KERNEL
 359 #ifndef PMAP_DEACTIVATE
 360 #define PMAP_DEACTIVATE_KERNEL(cpu)
 361 #else   /* PMAP_DEACTIVATE */
 362 #define PMAP_DEACTIVATE_KERNEL(cpu)                     \
 363                 PMAP_DEACTIVATE(pmap_kernel(), THREAD_NULL, cpu)
 364 #endif  /* PMAP_DEACTIVATE */
 365 #endif  /* PMAP_DEACTIVATE_KERNEL */
 366
 367 #ifndef PMAP_ENTER
 368 /*
 369  *      Macro to be used in place of pmap_enter()
 370  */
 371 #define PMAP_ENTER(pmap, virtual_address, page, protection, flags, wired) \
 372         MACRO_BEGIN                                                     \
 373         pmap_t          __pmap = (pmap);                                \
 374         vm_page_t       __page = (page);                                \
 375                                                                         \
 376         PMAP_ENTER_CHECK(__pmap, __page)                                \
 377         pmap_enter(__pmap,                                      \
 378                 (virtual_address),                                      \
 379                 __page->phys_page,                                      \
 380                         (protection),                                   \
 381                 (flags),                                                \
 382                 (wired));                                               \
 383         MACRO_END
 384 #endif  /* !PMAP_ENTER */
 385
 386 #ifndef PMAP_ENTER_OPTIONS
 387 #define PMAP_ENTER_OPTIONS(pmap, virtual_address, page, protection,     \
 388                                 flags, wired, options, result) \
 389         MACRO_BEGIN                                                     \
 390         pmap_t          __pmap = (pmap);                                \
 391         vm_page_t       __page = (page);                                \
 392                                                                         \
 393         PMAP_ENTER_CHECK(__pmap, __page)                                \
 394         result = pmap_enter_options(__pmap,                             \
 395                 (virtual_address),                                      \
 396                 __page->phys_page,                                      \
 397                         (protection),                                   \
 398                 (flags),                                                \
 399                 (wired),                                                \
 400                 options);                                       \
 401         MACRO_END
 402 #endif  /* !PMAP_ENTER_OPTIONS */
 403
 404 #define PMAP_ENTER_CHECK(pmap, page)                                    \
 405 {                                                                       \
 406         if ((pmap) != kernel_pmap) {                                    \
 407                 ASSERT_PAGE_DECRYPTED(page);                            \
 408         }                                                               \
 409         if ((page)->error) {                                            \
 410                 panic("VM page %p should not have an error\n",          \
 411                         (page));                                        \
 412         }                                                               \
 413 }
 414
 415 /*
 416  *      Routines to manage reference/modify bits based on
 417  *      physical addresses, simulating them if not provided
 418  *      by the hardware.
 419  */
 420                                 /* Clear reference bit */
 421 extern void             pmap_clear_reference(ppnum_t     pn);
 422                                 /* Return reference bit */
 423 extern boolean_t        (pmap_is_referenced)(ppnum_t     pn);
 424                                 /* Set modify bit */
 425 extern void             pmap_set_modify(ppnum_t  pn);
 426                                 /* Clear modify bit */
 427 extern void             pmap_clear_modify(ppnum_t pn);
 428                                 /* Return modify bit */
 429 extern boolean_t        pmap_is_modified(ppnum_t pn);
 430                                 /* Return modified and referenced bits */
 431 extern unsigned int pmap_get_refmod(ppnum_t pn);
 432                                 /* Clear modified and referenced bits */
 433 extern void                     pmap_clear_refmod(ppnum_t pn, unsigned int mask);
 434 #define VM_MEM_MODIFIED         0x01    /* Modified bit */
 435 #define VM_MEM_REFERENCED       0x02    /* Referenced bit */
 436
 437 /*
 438  *      Routines that operate on ranges of virtual addresses.
 439  */
 440 extern void             pmap_protect(   /* Change protections. */
 441                                 pmap_t          map,
 442                                 vm_map_offset_t s,
 443                                 vm_map_offset_t e,
 444                                 vm_prot_t       prot);
 445
 446 extern void             (pmap_pageable)(
 447                                 pmap_t          pmap,
 448                                 vm_map_offset_t start,
 449                                 vm_map_offset_t end,
 450                                 boolean_t       pageable);
 451
 452
 453 extern uint64_t pmap_nesting_size_min;
 454 extern uint64_t pmap_nesting_size_max;
 455
 456 extern kern_return_t pmap_nest(pmap_t grand,
 457                                pmap_t subord,
 458                                addr64_t vstart,
 459                                addr64_t nstart,
 460                                uint64_t size);
 461 extern kern_return_t pmap_unnest(pmap_t grand,
 462                                  addr64_t vaddr,
 463                                  uint64_t size);
 464 extern boolean_t pmap_adjust_unnest_parameters(pmap_t, vm_map_offset_t *, vm_map_offset_t *);
 465 #endif  /* MACH_KERNEL_PRIVATE */
 466
 467 extern boolean_t        pmap_is_noencrypt(ppnum_t);
 468 extern void             pmap_set_noencrypt(ppnum_t pn);
 469 extern void             pmap_clear_noencrypt(ppnum_t pn);
 470
 471 /*
 472  * JMM - This portion is exported to other kernel components right now,
 473  * but will be pulled back in the future when the needed functionality
 474  * is provided in a cleaner manner.
 475  */
 476
 477 extern pmap_t   kernel_pmap;                    /* The kernel's map */
 478 #define         pmap_kernel()   (kernel_pmap)
 479
 480 /* machine independent WIMG bits */
 481
 482 #define VM_MEM_GUARDED          0x1             /* (G) Guarded Storage */
 483 #define VM_MEM_COHERENT         0x2             /* (M) Memory Coherency */
 484 #define VM_MEM_NOT_CACHEABLE    0x4             /* (I) Cache Inhibit */
 485 #define VM_MEM_WRITE_THROUGH    0x8             /* (W) Write-Through */
 486
 487 #define VM_WIMG_MASK            0xFF
 488 #define VM_WIMG_USE_DEFAULT     0x80000000
 489
 490 #define VM_MEM_SUPERPAGE        0x100           /* map a superpage instead of a base page */
 491
 492 #define PMAP_OPTIONS_NOWAIT     0x1             /* don't block, return
 493                                                  * KERN_RESOURCE_SHORTAGE
 494                                                  * instead */
 495
 496 #if     !defined(__LP64__)
 497 extern vm_offset_t      pmap_extract(pmap_t pmap,
 498                                 vm_map_offset_t va);
 499 #endif
 500 extern void             pmap_change_wiring(     /* Specify pageability */
 501                                 pmap_t          pmap,
 502                                 vm_map_offset_t va,
 503                                 boolean_t       wired);
 504
 505 /* LP64todo - switch to vm_map_offset_t when it grows */
 506 extern void             pmap_remove(    /* Remove mappings. */
 507                                 pmap_t          map,
 508                                 vm_map_offset_t s,
 509                                 vm_map_offset_t e);
 510
 511 extern void             fillPage(ppnum_t pa, unsigned int fill);
 512
 513 extern void pmap_map_sharedpage(task_t task, pmap_t pmap);
 514 extern void pmap_unmap_sharedpage(pmap_t pmap);
 515
 516 #if defined(__LP64__)
 517 void pmap_pre_expand(pmap_t pmap, vm_map_offset_t vaddr);
 518 #endif
 519
 520 #endif  /* KERNEL_PRIVATE */
 521
 522 #endif  /* _VM_PMAP_H_ */