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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  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);        /* Initialization,
 145                                                  * after kernel runs
 146                                                  * in virtual memory.
 147                                                  */
 148
 149 extern void             mapping_adjust(void);   /* Adjust free mapping count */
 150
 151 extern void             mapping_free_prime(void); /* Primes the mapping block release list */
 152
 153 #ifndef MACHINE_PAGES
 154 /*
 155  *      If machine/pmap.h defines MACHINE_PAGES, it must implement
 156  *      the above functions.  The pmap module has complete control.
 157  *      Otherwise, it must implement
 158  *              pmap_free_pages
 159  *              pmap_virtual_space
 160  *              pmap_next_page
 161  *              pmap_init
 162  *      and vm/vm_resident.c implements pmap_steal_memory and pmap_startup
 163  *      using pmap_free_pages, pmap_next_page, pmap_virtual_space,
 164  *      and pmap_enter.  pmap_free_pages may over-estimate the number
 165  *      of unused physical pages, and pmap_next_page may return FALSE
 166  *      to indicate that there are no more unused pages to return.
 167  *      However, for best performance pmap_free_pages should be accurate.
 168  */
 169
 170 extern boolean_t        pmap_next_page(ppnum_t *pnum);
 171                                                 /* During VM initialization,
 172                                                  * return the next unused
 173                                                  * physical page.
 174                                                  */
 175 extern void             pmap_virtual_space(
 176                                         vm_offset_t     *virtual_start,
 177                                         vm_offset_t     *virtual_end);
 178                                                 /* During VM initialization,
 179                                                  * report virtual space
 180                                                  * available for the kernel.
 181                                                  */
 182 #endif  /* MACHINE_PAGES */
 183
 184 /*
 185  *      Routines to manage the physical map data structure.
 186  */
 187 extern pmap_t           pmap_create(vm_map_size_t size);        /* Create a pmap_t. */
 188 extern pmap_t           (pmap_kernel)(void);    /* Return the kernel's pmap */
 189 extern void             pmap_reference(pmap_t pmap);    /* Gain a reference. */
 190 extern void             pmap_destroy(pmap_t pmap); /* Release a reference. */
 191 extern void             pmap_switch(pmap_t);
 192
 193
 194 extern void             pmap_enter(     /* Enter a mapping */
 195                                 pmap_t          pmap,
 196                                 vm_map_offset_t v,
 197                                 ppnum_t         pn,
 198                                 vm_prot_t       prot,
 199                                 unsigned int    flags,
 200                                 boolean_t       wired);
 201
 202 extern void             pmap_remove_some_phys(
 203                                 pmap_t          pmap,
 204                                 ppnum_t         pn);
 205
 206
 207 /*
 208  *      Routines that operate on physical addresses.
 209  */
 210
 211 extern void             pmap_page_protect(      /* Restrict access to page. */
 212                                 ppnum_t phys,
 213                                 vm_prot_t       prot);
 214
 215 extern void             (pmap_zero_page)(
 216                                 ppnum_t         pn);
 217
 218 extern void             (pmap_zero_part_page)(
 219                                 ppnum_t         pn,
 220                                 vm_offset_t     offset,
 221                                 vm_size_t       len);
 222
 223 extern void             (pmap_copy_page)(
 224                                 ppnum_t         src,
 225                                 ppnum_t         dest);
 226
 227 extern void             (pmap_copy_part_page)(
 228                                 ppnum_t         src,
 229                                 vm_offset_t     src_offset,
 230                                 ppnum_t         dst,
 231                                 vm_offset_t     dst_offset,
 232                                 vm_size_t       len);
 233
 234 extern void             (pmap_copy_part_lpage)(
 235                                 vm_offset_t     src,
 236                                 ppnum_t         dst,
 237                                 vm_offset_t     dst_offset,
 238                                 vm_size_t       len);
 239
 240 extern void             (pmap_copy_part_rpage)(
 241                                 ppnum_t         src,
 242                                 vm_offset_t     src_offset,
 243                                 vm_offset_t     dst,
 244                                 vm_size_t       len);
 245
 246 extern unsigned int (pmap_disconnect)(  /* disconnect mappings and return reference and change */
 247                                 ppnum_t         phys);
 248
 249 extern kern_return_t    (pmap_attribute_cache_sync)(  /* Flush appropriate
 250                                                        * cache based on
 251                                                        * page number sent */
 252                                 ppnum_t         pn,
 253                                 vm_size_t       size,
 254                                 vm_machine_attribute_t attribute,
 255                                 vm_machine_attribute_val_t* value);
 256
 257 /*
 258  * debug/assertions. pmap_verify_free returns true iff
 259  * the given physical page is mapped into no pmap.
 260  */
 261 extern boolean_t        pmap_verify_free(ppnum_t pn);
 262
 263 /*
 264  *      Statistics routines
 265  */
 266 extern int              (pmap_resident_count)(pmap_t pmap);
 267
 268 /*
 269  *      Sundry required (internal) routines
 270  */
 271 extern void             pmap_collect(pmap_t pmap);/* Perform garbage
 272                                                  * collection, if any */
 273
 274 /*
 275  *      Optional routines
 276  */
 277 extern void             (pmap_copy)(            /* Copy range of mappings,
 278                                                  * if desired. */
 279                                 pmap_t          dest,
 280                                 pmap_t          source,
 281                                 vm_map_offset_t dest_va,
 282                                 vm_map_size_t   size,
 283                                 vm_map_offset_t source_va);
 284
 285 extern kern_return_t    (pmap_attribute)(       /* Get/Set special memory
 286                                                  * attributes */
 287                                 pmap_t          pmap,
 288                                 vm_map_offset_t va,
 289                                 vm_map_size_t   size,
 290                                 vm_machine_attribute_t  attribute,
 291                                 vm_machine_attribute_val_t* value);
 292
 293 /*
 294  * Routines defined as macros.
 295  */
 296 #ifndef PMAP_ACTIVATE_USER
 297 #ifndef PMAP_ACTIVATE
 298 #define PMAP_ACTIVATE_USER(thr, cpu)
 299 #else   /* PMAP_ACTIVATE */
 300 #define PMAP_ACTIVATE_USER(thr, cpu) {                  \
 301         pmap_t  pmap;                                           \
 302                                                                 \
 303         pmap = (thr)->map->pmap;                                \
 304         if (pmap != pmap_kernel())                              \
 305                 PMAP_ACTIVATE(pmap, (thr), (cpu));              \
 306 }
 307 #endif  /* PMAP_ACTIVATE */
 308 #endif  /* PMAP_ACTIVATE_USER */
 309
 310 #ifndef PMAP_DEACTIVATE_USER
 311 #ifndef PMAP_DEACTIVATE
 312 #define PMAP_DEACTIVATE_USER(thr, cpu)
 313 #else   /* PMAP_DEACTIVATE */
 314 #define PMAP_DEACTIVATE_USER(thr, cpu) {                        \
 315         pmap_t  pmap;                                           \
 316                                                                 \
 317         pmap = (thr)->map->pmap;                                \
 318         if ((pmap) != pmap_kernel())                    \
 319                 PMAP_DEACTIVATE(pmap, (thr), (cpu));    \
 320 }
 321 #endif  /* PMAP_DEACTIVATE */
 322 #endif  /* PMAP_DEACTIVATE_USER */
 323
 324 #ifndef PMAP_ACTIVATE_KERNEL
 325 #ifndef PMAP_ACTIVATE
 326 #define PMAP_ACTIVATE_KERNEL(cpu)
 327 #else   /* PMAP_ACTIVATE */
 328 #define PMAP_ACTIVATE_KERNEL(cpu)                       \
 329                 PMAP_ACTIVATE(pmap_kernel(), THREAD_NULL, cpu)
 330 #endif  /* PMAP_ACTIVATE */
 331 #endif  /* PMAP_ACTIVATE_KERNEL */
 332
 333 #ifndef PMAP_DEACTIVATE_KERNEL
 334 #ifndef PMAP_DEACTIVATE
 335 #define PMAP_DEACTIVATE_KERNEL(cpu)
 336 #else   /* PMAP_DEACTIVATE */
 337 #define PMAP_DEACTIVATE_KERNEL(cpu)                     \
 338                 PMAP_DEACTIVATE(pmap_kernel(), THREAD_NULL, cpu)
 339 #endif  /* PMAP_DEACTIVATE */
 340 #endif  /* PMAP_DEACTIVATE_KERNEL */
 341
 342 #ifndef PMAP_ENTER
 343 /*
 344  *      Macro to be used in place of pmap_enter()
 345  */
 346 #define PMAP_ENTER(pmap, virtual_address, page, protection, flags, wired) \
 347         MACRO_BEGIN                                                     \
 348         pmap_t          __pmap = (pmap);                                \
 349         vm_page_t       __page = (page);                                \
 350                                                                         \
 351         if (__pmap != kernel_pmap) {                                    \
 352                 ASSERT_PAGE_DECRYPTED(__page);                          \
 353         }                                                               \
 354         pmap_enter(__pmap,                                              \
 355                    (virtual_address),                                   \
 356                    __page->phys_page,                                   \
 357                    (protection) & ~__page->page_lock,                   \
 358                    (flags),                                             \
 359                    (wired));                                            \
 360         MACRO_END
 361 #endif  /* !PMAP_ENTER */
 362
 363 /*
 364  *      Routines to manage reference/modify bits based on
 365  *      physical addresses, simulating them if not provided
 366  *      by the hardware.
 367  */
 368                                 /* Clear reference bit */
 369 extern void             pmap_clear_reference(ppnum_t     pn);
 370                                 /* Return reference bit */
 371 extern boolean_t        (pmap_is_referenced)(ppnum_t     pn);
 372                                 /* Set modify bit */
 373 extern void             pmap_set_modify(ppnum_t  pn);
 374                                 /* Clear modify bit */
 375 extern void             pmap_clear_modify(ppnum_t pn);
 376                                 /* Return modify bit */
 377 extern boolean_t        pmap_is_modified(ppnum_t pn);
 378                                 /* Return modified and referenced bits */
 379 extern unsigned int pmap_get_refmod(ppnum_t pn);
 380                                 /* Clear modified and referenced bits */
 381 extern void                     pmap_clear_refmod(ppnum_t pn, unsigned int mask);
 382 #define VM_MEM_MODIFIED         0x01    /* Modified bit */
 383 #define VM_MEM_REFERENCED       0x02    /* Referenced bit */
 384
 385 /*
 386  *      Routines that operate on ranges of virtual addresses.
 387  */
 388 extern void             pmap_protect(   /* Change protections. */
 389                                 pmap_t          map,
 390                                 vm_map_offset_t s,
 391                                 vm_map_offset_t e,
 392                                 vm_prot_t       prot);
 393
 394 extern void             (pmap_pageable)(
 395                                 pmap_t          pmap,
 396                                 vm_map_offset_t start,
 397                                 vm_map_offset_t end,
 398                                 boolean_t       pageable);
 399
 400 #endif  /* MACH_KERNEL_PRIVATE */
 401
 402 /*
 403  * JMM - This portion is exported to other kernel components right now,
 404  * but will be pulled back in the future when the needed functionality
 405  * is provided in a cleaner manner.
 406  */
 407
 408 extern pmap_t   kernel_pmap;                    /* The kernel's map */
 409 #define         pmap_kernel()   (kernel_pmap)
 410
 411 /* machine independent WIMG bits */
 412
 413 #define VM_MEM_GUARDED          0x1             /* (G) Guarded Storage */
 414 #define VM_MEM_COHERENT         0x2             /* (M) Memory Coherency */
 415 #define VM_MEM_NOT_CACHEABLE    0x4             /* (I) Cache Inhibit */
 416 #define VM_MEM_WRITE_THROUGH    0x8             /* (W) Write-Through */
 417
 418 #define VM_WIMG_MASK            0xFF
 419 #define VM_WIMG_USE_DEFAULT     0x80000000
 420
 421 extern void             pmap_modify_pages(      /* Set modify bit for pages */
 422                                 pmap_t          map,
 423                                 vm_map_offset_t s,
 424                                 vm_map_offset_t e);
 425
 426 extern vm_offset_t      pmap_extract(pmap_t pmap,
 427                                 vm_map_offset_t va);
 428
 429 extern void             pmap_change_wiring(     /* Specify pageability */
 430                                 pmap_t          pmap,
 431                                 vm_map_offset_t va,
 432                                 boolean_t       wired);
 433
 434 /* LP64todo - switch to vm_map_offset_t when it grows */
 435 extern void             pmap_remove(    /* Remove mappings. */
 436                                 pmap_t          map,
 437                                 addr64_t        s,
 438                                 addr64_t        e);
 439
 440
 441 #endif  /* KERNEL_PRIVATE */
 442
 443 #endif  /* _VM_PMAP_H_ */