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