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
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  45  *
  46  * Carnegie Mellon requests users of this software to return to
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  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 #if defined(__LP64__)
 173 extern boolean_t        pmap_next_page_k64(ppnum_t *pnum);
 174 #endif
 175                                                 /* During VM initialization,
 176                                                  * return the next unused
 177                                                  * physical page.
 178                                                  */
 179 extern void             pmap_virtual_space(
 180                                         vm_offset_t     *virtual_start,
 181                                         vm_offset_t     *virtual_end);
 182                                                 /* During VM initialization,
 183                                                  * report virtual space
 184                                                  * available for the kernel.
 185                                                  */
 186 #endif  /* MACHINE_PAGES */
 187
 188 /*
 189  *      Routines to manage the physical map data structure.
 190  */
 191 extern pmap_t           pmap_create(    /* Create a pmap_t. */
 192                                 vm_map_size_t   size,
 193 #ifdef __i386__
 194                                 boolean_t       is_64bit);
 195 #else
 196                                 __unused boolean_t      is_64bit);
 197 #endif
 198 extern pmap_t           (pmap_kernel)(void);    /* Return the kernel's pmap */
 199 extern void             pmap_reference(pmap_t pmap);    /* Gain a reference. */
 200 extern void             pmap_destroy(pmap_t pmap); /* Release a reference. */
 201 extern void             pmap_switch(pmap_t);
 202
 203
 204 extern void             pmap_enter(     /* Enter a mapping */
 205                                 pmap_t          pmap,
 206                                 vm_map_offset_t v,
 207                                 ppnum_t         pn,
 208                                 vm_prot_t       prot,
 209                                 unsigned int    flags,
 210                                 boolean_t       wired);
 211
 212 extern kern_return_t    pmap_enter_options(
 213                                            pmap_t pmap,
 214                                            vm_map_offset_t v,
 215                                            ppnum_t pn,
 216                                            vm_prot_t prot,
 217                                            unsigned int flags,
 218                                            boolean_t wired,
 219                                            unsigned int options);
 220
 221 extern void             pmap_remove_some_phys(
 222                                 pmap_t          pmap,
 223                                 ppnum_t         pn);
 224
 225
 226 /*
 227  *      Routines that operate on physical addresses.
 228  */
 229
 230 extern void             pmap_page_protect(      /* Restrict access to page. */
 231                                 ppnum_t phys,
 232                                 vm_prot_t       prot);
 233
 234 extern void             (pmap_zero_page)(
 235                                 ppnum_t         pn);
 236
 237 extern void             (pmap_zero_part_page)(
 238                                 ppnum_t         pn,
 239                                 vm_offset_t     offset,
 240                                 vm_size_t       len);
 241
 242 extern void             (pmap_copy_page)(
 243                                 ppnum_t         src,
 244                                 ppnum_t         dest);
 245
 246 extern void             (pmap_copy_part_page)(
 247                                 ppnum_t         src,
 248                                 vm_offset_t     src_offset,
 249                                 ppnum_t         dst,
 250                                 vm_offset_t     dst_offset,
 251                                 vm_size_t       len);
 252
 253 extern void             (pmap_copy_part_lpage)(
 254                                 vm_offset_t     src,
 255                                 ppnum_t         dst,
 256                                 vm_offset_t     dst_offset,
 257                                 vm_size_t       len);
 258
 259 extern void             (pmap_copy_part_rpage)(
 260                                 ppnum_t         src,
 261                                 vm_offset_t     src_offset,
 262                                 vm_offset_t     dst,
 263                                 vm_size_t       len);
 264
 265 extern unsigned int (pmap_disconnect)(  /* disconnect mappings and return reference and change */
 266                                 ppnum_t         phys);
 267
 268 extern kern_return_t    (pmap_attribute_cache_sync)(  /* Flush appropriate
 269                                                        * cache based on
 270                                                        * page number sent */
 271                                 ppnum_t         pn,
 272                                 vm_size_t       size,
 273                                 vm_machine_attribute_t attribute,
 274                                 vm_machine_attribute_val_t* value);
 275
 276 extern unsigned int     (pmap_cache_attributes)(
 277                                 ppnum_t         pn);
 278
 279 extern void pmap_sync_page_data_phys(ppnum_t pa);
 280 extern void pmap_sync_page_attributes_phys(ppnum_t pa);
 281
 282 /*
 283  * debug/assertions. pmap_verify_free returns true iff
 284  * the given physical page is mapped into no pmap.
 285  */
 286 extern boolean_t        pmap_verify_free(ppnum_t pn);
 287
 288 /*
 289  *      Statistics routines
 290  */
 291 extern int              (pmap_resident_count)(pmap_t pmap);
 292 extern int              (pmap_resident_max)(pmap_t pmap);
 293
 294 /*
 295  *      Sundry required (internal) routines
 296  */
 297 #ifdef CURRENTLY_UNUSED_AND_UNTESTED
 298 extern void             pmap_collect(pmap_t pmap);/* Perform garbage
 299                                                  * collection, if any */
 300 #endif
 301 /*
 302  *      Optional routines
 303  */
 304 extern void             (pmap_copy)(            /* Copy range of mappings,
 305                                                  * if desired. */
 306                                 pmap_t          dest,
 307                                 pmap_t          source,
 308                                 vm_map_offset_t dest_va,
 309                                 vm_map_size_t   size,
 310                                 vm_map_offset_t source_va);
 311
 312 extern kern_return_t    (pmap_attribute)(       /* Get/Set special memory
 313                                                  * attributes */
 314                                 pmap_t          pmap,
 315                                 vm_map_offset_t va,
 316                                 vm_map_size_t   size,
 317                                 vm_machine_attribute_t  attribute,
 318                                 vm_machine_attribute_val_t* value);
 319
 320 /*
 321  * Routines defined as macros.
 322  */
 323 #ifndef PMAP_ACTIVATE_USER
 324 #ifndef PMAP_ACTIVATE
 325 #define PMAP_ACTIVATE_USER(thr, cpu)
 326 #else   /* PMAP_ACTIVATE */
 327 #define PMAP_ACTIVATE_USER(thr, cpu) {                  \
 328         pmap_t  pmap;                                           \
 329                                                                 \
 330         pmap = (thr)->map->pmap;                                \
 331         if (pmap != pmap_kernel())                              \
 332                 PMAP_ACTIVATE(pmap, (thr), (cpu));              \
 333 }
 334 #endif  /* PMAP_ACTIVATE */
 335 #endif  /* PMAP_ACTIVATE_USER */
 336
 337 #ifndef PMAP_DEACTIVATE_USER
 338 #ifndef PMAP_DEACTIVATE
 339 #define PMAP_DEACTIVATE_USER(thr, cpu)
 340 #else   /* PMAP_DEACTIVATE */
 341 #define PMAP_DEACTIVATE_USER(thr, cpu) {                        \
 342         pmap_t  pmap;                                           \
 343                                                                 \
 344         pmap = (thr)->map->pmap;                                \
 345         if ((pmap) != pmap_kernel())                    \
 346                 PMAP_DEACTIVATE(pmap, (thr), (cpu));    \
 347 }
 348 #endif  /* PMAP_DEACTIVATE */
 349 #endif  /* PMAP_DEACTIVATE_USER */
 350
 351 #ifndef PMAP_ACTIVATE_KERNEL
 352 #ifndef PMAP_ACTIVATE
 353 #define PMAP_ACTIVATE_KERNEL(cpu)
 354 #else   /* PMAP_ACTIVATE */
 355 #define PMAP_ACTIVATE_KERNEL(cpu)                       \
 356                 PMAP_ACTIVATE(pmap_kernel(), THREAD_NULL, cpu)
 357 #endif  /* PMAP_ACTIVATE */
 358 #endif  /* PMAP_ACTIVATE_KERNEL */
 359
 360 #ifndef PMAP_DEACTIVATE_KERNEL
 361 #ifndef PMAP_DEACTIVATE
 362 #define PMAP_DEACTIVATE_KERNEL(cpu)
 363 #else   /* PMAP_DEACTIVATE */
 364 #define PMAP_DEACTIVATE_KERNEL(cpu)                     \
 365                 PMAP_DEACTIVATE(pmap_kernel(), THREAD_NULL, cpu)
 366 #endif  /* PMAP_DEACTIVATE */
 367 #endif  /* PMAP_DEACTIVATE_KERNEL */
 368
 369 #ifndef PMAP_ENTER
 370 /*
 371  *      Macro to be used in place of pmap_enter()
 372  */
 373 #define PMAP_ENTER(pmap, virtual_address, page, protection, flags, wired) \
 374         MACRO_BEGIN                                                     \
 375         pmap_t          __pmap = (pmap);                                \
 376         vm_page_t       __page = (page);                                \
 377                                                                         \
 378         PMAP_ENTER_CHECK(__pmap, __page)                                \
 379         pmap_enter(__pmap,                                      \
 380                 (virtual_address),                                      \
 381                 __page->phys_page,                                      \
 382                         (protection),                                   \
 383                 (flags),                                                \
 384                 (wired));                                               \
 385         MACRO_END
 386 #endif  /* !PMAP_ENTER */
 387
 388 #ifndef PMAP_ENTER_OPTIONS
 389 #define PMAP_ENTER_OPTIONS(pmap, virtual_address, page, protection,     \
 390                                 flags, wired, options, result) \
 391         MACRO_BEGIN                                                     \
 392         pmap_t          __pmap = (pmap);                                \
 393         vm_page_t       __page = (page);                                \
 394                                                                         \
 395         PMAP_ENTER_CHECK(__pmap, __page)                                \
 396         result = pmap_enter_options(__pmap,                             \
 397                 (virtual_address),                                      \
 398                 __page->phys_page,                                      \
 399                         (protection),                                   \
 400                 (flags),                                                \
 401                 (wired),                                                \
 402                 options);                                       \
 403         MACRO_END
 404 #endif  /* !PMAP_ENTER_OPTIONS */
 405
 406 #define PMAP_ENTER_CHECK(pmap, page)                                    \
 407 {                                                                       \
 408         if ((pmap) != kernel_pmap) {                                    \
 409                 ASSERT_PAGE_DECRYPTED(page);                            \
 410         }                                                               \
 411         if ((page)->error) {                                            \
 412                 panic("VM page %p should not have an error\n",          \
 413                         (page));                                        \
 414         }                                                               \
 415 }
 416
 417 /*
 418  *      Routines to manage reference/modify bits based on
 419  *      physical addresses, simulating them if not provided
 420  *      by the hardware.
 421  */
 422                                 /* Clear reference bit */
 423 extern void             pmap_clear_reference(ppnum_t     pn);
 424                                 /* Return reference bit */
 425 extern boolean_t        (pmap_is_referenced)(ppnum_t     pn);
 426                                 /* Set modify bit */
 427 extern void             pmap_set_modify(ppnum_t  pn);
 428                                 /* Clear modify bit */
 429 extern void             pmap_clear_modify(ppnum_t pn);
 430                                 /* Return modify bit */
 431 extern boolean_t        pmap_is_modified(ppnum_t pn);
 432                                 /* Return modified and referenced bits */
 433 extern unsigned int pmap_get_refmod(ppnum_t pn);
 434                                 /* Clear modified and referenced bits */
 435 extern void                     pmap_clear_refmod(ppnum_t pn, unsigned int mask);
 436 #define VM_MEM_MODIFIED         0x01    /* Modified bit */
 437 #define VM_MEM_REFERENCED       0x02    /* Referenced bit */
 438
 439 /*
 440  *      Routines that operate on ranges of virtual addresses.
 441  */
 442 extern void             pmap_protect(   /* Change protections. */
 443                                 pmap_t          map,
 444                                 vm_map_offset_t s,
 445                                 vm_map_offset_t e,
 446                                 vm_prot_t       prot);
 447
 448 extern void             (pmap_pageable)(
 449                                 pmap_t          pmap,
 450                                 vm_map_offset_t start,
 451                                 vm_map_offset_t end,
 452                                 boolean_t       pageable);
 453
 454
 455 extern uint64_t pmap_nesting_size_min;
 456 extern uint64_t pmap_nesting_size_max;
 457
 458 extern kern_return_t pmap_nest(pmap_t grand,
 459                                pmap_t subord,
 460                                addr64_t vstart,
 461                                addr64_t nstart,
 462                                uint64_t size);
 463 extern kern_return_t pmap_unnest(pmap_t grand,
 464                                  addr64_t vaddr,
 465                                  uint64_t size);
 466 extern boolean_t pmap_adjust_unnest_parameters(pmap_t, vm_map_offset_t *, vm_map_offset_t *);
 467 #endif  /* MACH_KERNEL_PRIVATE */
 468
 469 /*
 470  * JMM - This portion is exported to other kernel components right now,
 471  * but will be pulled back in the future when the needed functionality
 472  * is provided in a cleaner manner.
 473  */
 474
 475 extern pmap_t   kernel_pmap;                    /* The kernel's map */
 476 #define         pmap_kernel()   (kernel_pmap)
 477
 478 /* machine independent WIMG bits */
 479
 480 #define VM_MEM_GUARDED          0x1             /* (G) Guarded Storage */
 481 #define VM_MEM_COHERENT         0x2             /* (M) Memory Coherency */
 482 #define VM_MEM_NOT_CACHEABLE    0x4             /* (I) Cache Inhibit */
 483 #define VM_MEM_WRITE_THROUGH    0x8             /* (W) Write-Through */
 484
 485 #define VM_WIMG_MASK            0xFF
 486 #define VM_WIMG_USE_DEFAULT     0x80000000
 487
 488 #define VM_MEM_SUPERPAGE        0x100           /* map a superpage instead of a base page */
 489
 490 #define PMAP_OPTIONS_NOWAIT     0x1             /* don't block, return
 491                                                  * KERN_RESOURCE_SHORTAGE
 492                                                  * instead */
 493
 494 #if     !defined(__LP64__)
 495 extern vm_offset_t      pmap_extract(pmap_t pmap,
 496                                 vm_map_offset_t va);
 497 #endif
 498 extern void             pmap_change_wiring(     /* Specify pageability */
 499                                 pmap_t          pmap,
 500                                 vm_map_offset_t va,
 501                                 boolean_t       wired);
 502
 503 /* LP64todo - switch to vm_map_offset_t when it grows */
 504 extern void             pmap_remove(    /* Remove mappings. */
 505                                 pmap_t          map,
 506                                 vm_map_offset_t s,
 507                                 vm_map_offset_t e);
 508
 509 extern void             fillPage(ppnum_t pa, unsigned int fill);
 510
 511 extern void pmap_map_sharedpage(task_t task, pmap_t pmap);
 512 extern void pmap_unmap_sharedpage(pmap_t pmap);
 513
 514 #if defined(__LP64__)
 515 void pmap_pre_expand(pmap_t pmap, vm_map_offset_t vaddr);
 516 #endif
 517
 518 #endif  /* KERNEL_PRIVATE */
 519
 520 #endif  /* _VM_PMAP_H_ */