mmu_if.m revision 268591
1#- 2# Copyright (c) 2005 Peter Grehan 3# All rights reserved. 4# 5# Redistribution and use in source and binary forms, with or without 6# modification, are permitted provided that the following conditions 7# are met: 8# 1. Redistributions of source code must retain the above copyright 9# notice, this list of conditions and the following disclaimer. 10# 2. Redistributions in binary form must reproduce the above copyright 11# notice, this list of conditions and the following disclaimer in the 12# documentation and/or other materials provided with the distribution. 13# 14# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24# SUCH DAMAGE. 25# 26# $FreeBSD: head/sys/powerpc/powerpc/mmu_if.m 268591 2014-07-13 16:27:57Z alc $ 27# 28 29#include <sys/param.h> 30#include <sys/lock.h> 31#include <sys/mutex.h> 32#include <sys/systm.h> 33 34#include <vm/vm.h> 35#include <vm/vm_page.h> 36 37#include <machine/mmuvar.h> 38 39/** 40 * @defgroup MMU mmu - KObj methods for PowerPC MMU implementations 41 * @brief A set of methods required by all MMU implementations. These 42 * are basically direct call-thru's from the pmap machine-dependent 43 * code. 44 * Thanks to Bruce M Simpson's pmap man pages for routine descriptions. 45 *@{ 46 */ 47 48INTERFACE mmu; 49 50# 51# Default implementations of some methods 52# 53CODE { 54 static void mmu_null_copy(mmu_t mmu, pmap_t dst_pmap, pmap_t src_pmap, 55 vm_offset_t dst_addr, vm_size_t len, vm_offset_t src_addr) 56 { 57 return; 58 } 59 60 static void mmu_null_growkernel(mmu_t mmu, vm_offset_t addr) 61 { 62 return; 63 } 64 65 static void mmu_null_init(mmu_t mmu) 66 { 67 return; 68 } 69 70 static boolean_t mmu_null_is_prefaultable(mmu_t mmu, pmap_t pmap, 71 vm_offset_t va) 72 { 73 return (FALSE); 74 } 75 76 static void mmu_null_object_init_pt(mmu_t mmu, pmap_t pmap, 77 vm_offset_t addr, vm_object_t object, vm_pindex_t index, 78 vm_size_t size) 79 { 80 return; 81 } 82 83 static void mmu_null_page_init(mmu_t mmu, vm_page_t m) 84 { 85 return; 86 } 87 88 static void mmu_null_remove_pages(mmu_t mmu, pmap_t pmap) 89 { 90 return; 91 } 92 93 static int mmu_null_mincore(mmu_t mmu, pmap_t pmap, vm_offset_t addr, 94 vm_paddr_t *locked_pa) 95 { 96 return (0); 97 } 98 99 static void mmu_null_deactivate(struct thread *td) 100 { 101 return; 102 } 103 104 static void mmu_null_align_superpage(mmu_t mmu, vm_object_t object, 105 vm_ooffset_t offset, vm_offset_t *addr, vm_size_t size) 106 { 107 return; 108 } 109 110 static struct pmap_md *mmu_null_scan_md(mmu_t mmu, struct pmap_md *p) 111 { 112 return (NULL); 113 } 114 115 static void *mmu_null_mapdev_attr(mmu_t mmu, vm_offset_t pa, 116 vm_size_t size, vm_memattr_t ma) 117 { 118 return MMU_MAPDEV(mmu, pa, size); 119 } 120 121 static void mmu_null_kenter_attr(mmu_t mmu, vm_offset_t va, 122 vm_offset_t pa, vm_memattr_t ma) 123 { 124 MMU_KENTER(mmu, va, pa); 125 } 126 127 static void mmu_null_page_set_memattr(mmu_t mmu, vm_page_t m, 128 vm_memattr_t ma) 129 { 130 return; 131 } 132}; 133 134 135/** 136 * @brief Apply the given advice to the specified range of addresses within 137 * the given pmap. Depending on the advice, clear the referenced and/or 138 * modified flags in each mapping and set the mapped page's dirty field. 139 * 140 * @param _pmap physical map 141 * @param _start virtual range start 142 * @param _end virtual range end 143 * @param _advice advice to apply 144 */ 145METHOD void advise { 146 mmu_t _mmu; 147 pmap_t _pmap; 148 vm_offset_t _start; 149 vm_offset_t _end; 150 int _advice; 151}; 152 153 154/** 155 * @brief Change the wiring attribute for the page in the given physical 156 * map and virtual address. 157 * 158 * @param _pmap physical map of page 159 * @param _va page virtual address 160 * @param _wired TRUE to increment wired count, FALSE to decrement 161 */ 162METHOD void change_wiring { 163 mmu_t _mmu; 164 pmap_t _pmap; 165 vm_offset_t _va; 166 boolean_t _wired; 167}; 168 169 170/** 171 * @brief Clear the 'modified' bit on the given physical page 172 * 173 * @param _pg physical page 174 */ 175METHOD void clear_modify { 176 mmu_t _mmu; 177 vm_page_t _pg; 178}; 179 180 181/** 182 * @brief Clear the write and modified bits in each of the given 183 * physical page's mappings 184 * 185 * @param _pg physical page 186 */ 187METHOD void remove_write { 188 mmu_t _mmu; 189 vm_page_t _pg; 190}; 191 192 193/** 194 * @brief Copy the address range given by the source physical map, virtual 195 * address and length to the destination physical map and virtual address. 196 * This routine is optional (xxx default null implementation ?) 197 * 198 * @param _dst_pmap destination physical map 199 * @param _src_pmap source physical map 200 * @param _dst_addr destination virtual address 201 * @param _len size of range 202 * @param _src_addr source virtual address 203 */ 204METHOD void copy { 205 mmu_t _mmu; 206 pmap_t _dst_pmap; 207 pmap_t _src_pmap; 208 vm_offset_t _dst_addr; 209 vm_size_t _len; 210 vm_offset_t _src_addr; 211} DEFAULT mmu_null_copy; 212 213 214/** 215 * @brief Copy the source physical page to the destination physical page 216 * 217 * @param _src source physical page 218 * @param _dst destination physical page 219 */ 220METHOD void copy_page { 221 mmu_t _mmu; 222 vm_page_t _src; 223 vm_page_t _dst; 224}; 225 226METHOD void copy_pages { 227 mmu_t _mmu; 228 vm_page_t *_ma; 229 vm_offset_t _a_offset; 230 vm_page_t *_mb; 231 vm_offset_t _b_offset; 232 int _xfersize; 233}; 234 235/** 236 * @brief Create a mapping between a virtual/physical address pair in the 237 * passed physical map with the specified protection and wiring 238 * 239 * @param _pmap physical map 240 * @param _va mapping virtual address 241 * @param _p mapping physical page 242 * @param _prot mapping page protection 243 * @param _wired TRUE if page will be wired 244 */ 245METHOD void enter { 246 mmu_t _mmu; 247 pmap_t _pmap; 248 vm_offset_t _va; 249 vm_page_t _p; 250 vm_prot_t _prot; 251 boolean_t _wired; 252}; 253 254 255/** 256 * @brief Maps a sequence of resident pages belonging to the same object. 257 * 258 * @param _pmap physical map 259 * @param _start virtual range start 260 * @param _end virtual range end 261 * @param _m_start physical page mapped at start 262 * @param _prot mapping page protection 263 */ 264METHOD void enter_object { 265 mmu_t _mmu; 266 pmap_t _pmap; 267 vm_offset_t _start; 268 vm_offset_t _end; 269 vm_page_t _m_start; 270 vm_prot_t _prot; 271}; 272 273 274/** 275 * @brief A faster entry point for page mapping where it is possible 276 * to short-circuit some of the tests in pmap_enter. 277 * 278 * @param _pmap physical map (and also currently active pmap) 279 * @param _va mapping virtual address 280 * @param _pg mapping physical page 281 * @param _prot new page protection - used to see if page is exec. 282 */ 283METHOD void enter_quick { 284 mmu_t _mmu; 285 pmap_t _pmap; 286 vm_offset_t _va; 287 vm_page_t _pg; 288 vm_prot_t _prot; 289}; 290 291 292/** 293 * @brief Reverse map the given virtual address, returning the physical 294 * page associated with the address if a mapping exists. 295 * 296 * @param _pmap physical map 297 * @param _va mapping virtual address 298 * 299 * @retval 0 No mapping found 300 * @retval addr The mapping physical address 301 */ 302METHOD vm_paddr_t extract { 303 mmu_t _mmu; 304 pmap_t _pmap; 305 vm_offset_t _va; 306}; 307 308 309/** 310 * @brief Reverse map the given virtual address, returning the 311 * physical page if found. The page must be held (by calling 312 * vm_page_hold) if the page protection matches the given protection 313 * 314 * @param _pmap physical map 315 * @param _va mapping virtual address 316 * @param _prot protection used to determine if physical page 317 * should be locked 318 * 319 * @retval NULL No mapping found 320 * @retval page Pointer to physical page. Held if protections match 321 */ 322METHOD vm_page_t extract_and_hold { 323 mmu_t _mmu; 324 pmap_t _pmap; 325 vm_offset_t _va; 326 vm_prot_t _prot; 327}; 328 329 330/** 331 * @brief Increase kernel virtual address space to the given virtual address. 332 * Not really required for PowerPC, so optional unless the MMU implementation 333 * can use it. 334 * 335 * @param _va new upper limit for kernel virtual address space 336 */ 337METHOD void growkernel { 338 mmu_t _mmu; 339 vm_offset_t _va; 340} DEFAULT mmu_null_growkernel; 341 342 343/** 344 * @brief Called from vm_mem_init. Zone allocation is available at 345 * this stage so a convenient time to create zones. This routine is 346 * for MMU-implementation convenience and is optional. 347 */ 348METHOD void init { 349 mmu_t _mmu; 350} DEFAULT mmu_null_init; 351 352 353/** 354 * @brief Return if the page has been marked by MMU hardware to have been 355 * modified 356 * 357 * @param _pg physical page to test 358 * 359 * @retval boolean TRUE if page has been modified 360 */ 361METHOD boolean_t is_modified { 362 mmu_t _mmu; 363 vm_page_t _pg; 364}; 365 366 367/** 368 * @brief Return whether the specified virtual address is a candidate to be 369 * prefaulted in. This routine is optional. 370 * 371 * @param _pmap physical map 372 * @param _va virtual address to test 373 * 374 * @retval boolean TRUE if the address is a candidate. 375 */ 376METHOD boolean_t is_prefaultable { 377 mmu_t _mmu; 378 pmap_t _pmap; 379 vm_offset_t _va; 380} DEFAULT mmu_null_is_prefaultable; 381 382 383/** 384 * @brief Return whether or not the specified physical page was referenced 385 * in any physical maps. 386 * 387 * @params _pg physical page 388 * 389 * @retval boolean TRUE if page has been referenced 390 */ 391METHOD boolean_t is_referenced { 392 mmu_t _mmu; 393 vm_page_t _pg; 394}; 395 396 397/** 398 * @brief Return a count of referenced bits for a page, clearing those bits. 399 * Not all referenced bits need to be cleared, but it is necessary that 0 400 * only be returned when there are none set. 401 * 402 * @params _m physical page 403 * 404 * @retval int count of referenced bits 405 */ 406METHOD int ts_referenced { 407 mmu_t _mmu; 408 vm_page_t _pg; 409}; 410 411 412/** 413 * @brief Map the requested physical address range into kernel virtual 414 * address space. The value in _virt is taken as a hint. The virtual 415 * address of the range is returned, or NULL if the mapping could not 416 * be created. The range can be direct-mapped if that is supported. 417 * 418 * @param *_virt Hint for start virtual address, and also return 419 * value 420 * @param _start physical address range start 421 * @param _end physical address range end 422 * @param _prot protection of range (currently ignored) 423 * 424 * @retval NULL could not map the area 425 * @retval addr, *_virt mapping start virtual address 426 */ 427METHOD vm_offset_t map { 428 mmu_t _mmu; 429 vm_offset_t *_virt; 430 vm_paddr_t _start; 431 vm_paddr_t _end; 432 int _prot; 433}; 434 435 436/** 437 * @brief Used to create a contiguous set of read-only mappings for a 438 * given object to try and eliminate a cascade of on-demand faults as 439 * the object is accessed sequentially. This routine is optional. 440 * 441 * @param _pmap physical map 442 * @param _addr mapping start virtual address 443 * @param _object device-backed V.M. object to be mapped 444 * @param _pindex page-index within object of mapping start 445 * @param _size size in bytes of mapping 446 */ 447METHOD void object_init_pt { 448 mmu_t _mmu; 449 pmap_t _pmap; 450 vm_offset_t _addr; 451 vm_object_t _object; 452 vm_pindex_t _pindex; 453 vm_size_t _size; 454} DEFAULT mmu_null_object_init_pt; 455 456 457/** 458 * @brief Used to determine if the specified page has a mapping for the 459 * given physical map, by scanning the list of reverse-mappings from the 460 * page. The list is scanned to a maximum of 16 entries. 461 * 462 * @param _pmap physical map 463 * @param _pg physical page 464 * 465 * @retval bool TRUE if the physical map was found in the first 16 466 * reverse-map list entries off the physical page. 467 */ 468METHOD boolean_t page_exists_quick { 469 mmu_t _mmu; 470 pmap_t _pmap; 471 vm_page_t _pg; 472}; 473 474 475/** 476 * @brief Initialise the machine-dependent section of the physical page 477 * data structure. This routine is optional. 478 * 479 * @param _pg physical page 480 */ 481METHOD void page_init { 482 mmu_t _mmu; 483 vm_page_t _pg; 484} DEFAULT mmu_null_page_init; 485 486 487/** 488 * @brief Count the number of managed mappings to the given physical 489 * page that are wired. 490 * 491 * @param _pg physical page 492 * 493 * @retval int the number of wired, managed mappings to the 494 * given physical page 495 */ 496METHOD int page_wired_mappings { 497 mmu_t _mmu; 498 vm_page_t _pg; 499}; 500 501 502/** 503 * @brief Initialise a physical map data structure 504 * 505 * @param _pmap physical map 506 */ 507METHOD void pinit { 508 mmu_t _mmu; 509 pmap_t _pmap; 510}; 511 512 513/** 514 * @brief Initialise the physical map for process 0, the initial process 515 * in the system. 516 * XXX default to pinit ? 517 * 518 * @param _pmap physical map 519 */ 520METHOD void pinit0 { 521 mmu_t _mmu; 522 pmap_t _pmap; 523}; 524 525 526/** 527 * @brief Set the protection for physical pages in the given virtual address 528 * range to the given value. 529 * 530 * @param _pmap physical map 531 * @param _start virtual range start 532 * @param _end virtual range end 533 * @param _prot new page protection 534 */ 535METHOD void protect { 536 mmu_t _mmu; 537 pmap_t _pmap; 538 vm_offset_t _start; 539 vm_offset_t _end; 540 vm_prot_t _prot; 541}; 542 543 544/** 545 * @brief Create a mapping in kernel virtual address space for the given array 546 * of wired physical pages. 547 * 548 * @param _start mapping virtual address start 549 * @param *_m array of physical page pointers 550 * @param _count array elements 551 */ 552METHOD void qenter { 553 mmu_t _mmu; 554 vm_offset_t _start; 555 vm_page_t *_pg; 556 int _count; 557}; 558 559 560/** 561 * @brief Remove the temporary mappings created by qenter. 562 * 563 * @param _start mapping virtual address start 564 * @param _count number of pages in mapping 565 */ 566METHOD void qremove { 567 mmu_t _mmu; 568 vm_offset_t _start; 569 int _count; 570}; 571 572 573/** 574 * @brief Release per-pmap resources, e.g. mutexes, allocated memory etc. There 575 * should be no existing mappings for the physical map at this point 576 * 577 * @param _pmap physical map 578 */ 579METHOD void release { 580 mmu_t _mmu; 581 pmap_t _pmap; 582}; 583 584 585/** 586 * @brief Remove all mappings in the given physical map for the start/end 587 * virtual address range. The range will be page-aligned. 588 * 589 * @param _pmap physical map 590 * @param _start mapping virtual address start 591 * @param _end mapping virtual address end 592 */ 593METHOD void remove { 594 mmu_t _mmu; 595 pmap_t _pmap; 596 vm_offset_t _start; 597 vm_offset_t _end; 598}; 599 600 601/** 602 * @brief Traverse the reverse-map list off the given physical page and 603 * remove all mappings. Clear the PGA_WRITEABLE attribute from the page. 604 * 605 * @param _pg physical page 606 */ 607METHOD void remove_all { 608 mmu_t _mmu; 609 vm_page_t _pg; 610}; 611 612 613/** 614 * @brief Remove all mappings in the given start/end virtual address range 615 * for the given physical map. Similar to the remove method, but it used 616 * when tearing down all mappings in an address space. This method is 617 * optional, since pmap_remove will be called for each valid vm_map in 618 * the address space later. 619 * 620 * @param _pmap physical map 621 * @param _start mapping virtual address start 622 * @param _end mapping virtual address end 623 */ 624METHOD void remove_pages { 625 mmu_t _mmu; 626 pmap_t _pmap; 627} DEFAULT mmu_null_remove_pages; 628 629 630/** 631 * @brief Clear the wired attribute from the mappings for the specified range 632 * of addresses in the given pmap. 633 * 634 * @param _pmap physical map 635 * @param _start virtual range start 636 * @param _end virtual range end 637 */ 638METHOD void unwire { 639 mmu_t _mmu; 640 pmap_t _pmap; 641 vm_offset_t _start; 642 vm_offset_t _end; 643}; 644 645 646/** 647 * @brief Zero a physical page. It is not assumed that the page is mapped, 648 * so a temporary (or direct) mapping may need to be used. 649 * 650 * @param _pg physical page 651 */ 652METHOD void zero_page { 653 mmu_t _mmu; 654 vm_page_t _pg; 655}; 656 657 658/** 659 * @brief Zero a portion of a physical page, starting at a given offset and 660 * for a given size (multiples of 512 bytes for 4k pages). 661 * 662 * @param _pg physical page 663 * @param _off byte offset from start of page 664 * @param _size size of area to zero 665 */ 666METHOD void zero_page_area { 667 mmu_t _mmu; 668 vm_page_t _pg; 669 int _off; 670 int _size; 671}; 672 673 674/** 675 * @brief Called from the idle loop to zero pages. XXX I think locking 676 * constraints might be different here compared to zero_page. 677 * 678 * @param _pg physical page 679 */ 680METHOD void zero_page_idle { 681 mmu_t _mmu; 682 vm_page_t _pg; 683}; 684 685 686/** 687 * @brief Extract mincore(2) information from a mapping. 688 * 689 * @param _pmap physical map 690 * @param _addr page virtual address 691 * @param _locked_pa page physical address 692 * 693 * @retval 0 no result 694 * @retval non-zero mincore(2) flag values 695 */ 696METHOD int mincore { 697 mmu_t _mmu; 698 pmap_t _pmap; 699 vm_offset_t _addr; 700 vm_paddr_t *_locked_pa; 701} DEFAULT mmu_null_mincore; 702 703 704/** 705 * @brief Perform any operations required to allow a physical map to be used 706 * before it's address space is accessed. 707 * 708 * @param _td thread associated with physical map 709 */ 710METHOD void activate { 711 mmu_t _mmu; 712 struct thread *_td; 713}; 714 715/** 716 * @brief Perform any operations required to deactivate a physical map, 717 * for instance as it is context-switched out. 718 * 719 * @param _td thread associated with physical map 720 */ 721METHOD void deactivate { 722 mmu_t _mmu; 723 struct thread *_td; 724} DEFAULT mmu_null_deactivate; 725 726/** 727 * @brief Return a hint for the best virtual address to map a tentative 728 * virtual address range in a given VM object. The default is to just 729 * return the given tentative start address. 730 * 731 * @param _obj VM backing object 732 * @param _offset starting offset with the VM object 733 * @param _addr initial guess at virtual address 734 * @param _size size of virtual address range 735 */ 736METHOD void align_superpage { 737 mmu_t _mmu; 738 vm_object_t _obj; 739 vm_ooffset_t _offset; 740 vm_offset_t *_addr; 741 vm_size_t _size; 742} DEFAULT mmu_null_align_superpage; 743 744 745 746 747/** 748 * INTERNAL INTERFACES 749 */ 750 751/** 752 * @brief Bootstrap the VM system. At the completion of this routine, the 753 * kernel will be running in it's own address space with full control over 754 * paging. 755 * 756 * @param _start start of reserved memory (obsolete ???) 757 * @param _end end of reserved memory (obsolete ???) 758 * XXX I think the intent of these was to allow 759 * the memory used by kernel text+data+bss and 760 * loader variables/load-time kld's to be carved out 761 * of available physical mem. 762 * 763 */ 764METHOD void bootstrap { 765 mmu_t _mmu; 766 vm_offset_t _start; 767 vm_offset_t _end; 768}; 769 770/** 771 * @brief Set up the MMU on the current CPU. Only called by the PMAP layer 772 * for alternate CPUs on SMP systems. 773 * 774 * @param _ap Set to 1 if the CPU being set up is an AP 775 * 776 */ 777METHOD void cpu_bootstrap { 778 mmu_t _mmu; 779 int _ap; 780}; 781 782 783/** 784 * @brief Create a kernel mapping for a given physical address range. 785 * Called by bus code on behalf of device drivers. The mapping does not 786 * have to be a virtual address: it can be a direct-mapped physical address 787 * if that is supported by the MMU. 788 * 789 * @param _pa start physical address 790 * @param _size size in bytes of mapping 791 * 792 * @retval addr address of mapping. 793 */ 794METHOD void * mapdev { 795 mmu_t _mmu; 796 vm_paddr_t _pa; 797 vm_size_t _size; 798}; 799 800/** 801 * @brief Create a kernel mapping for a given physical address range. 802 * Called by bus code on behalf of device drivers. The mapping does not 803 * have to be a virtual address: it can be a direct-mapped physical address 804 * if that is supported by the MMU. 805 * 806 * @param _pa start physical address 807 * @param _size size in bytes of mapping 808 * @param _attr cache attributes 809 * 810 * @retval addr address of mapping. 811 */ 812METHOD void * mapdev_attr { 813 mmu_t _mmu; 814 vm_offset_t _pa; 815 vm_size_t _size; 816 vm_memattr_t _attr; 817} DEFAULT mmu_null_mapdev_attr; 818 819/** 820 * @brief Change cache control attributes for a page. Should modify all 821 * mappings for that page. 822 * 823 * @param _m page to modify 824 * @param _ma new cache control attributes 825 */ 826METHOD void page_set_memattr { 827 mmu_t _mmu; 828 vm_page_t _pg; 829 vm_memattr_t _ma; 830} DEFAULT mmu_null_page_set_memattr; 831 832/** 833 * @brief Remove the mapping created by mapdev. Called when a driver 834 * is unloaded. 835 * 836 * @param _va Mapping address returned from mapdev 837 * @param _size size in bytes of mapping 838 */ 839METHOD void unmapdev { 840 mmu_t _mmu; 841 vm_offset_t _va; 842 vm_size_t _size; 843}; 844 845 846/** 847 * @brief Reverse-map a kernel virtual address 848 * 849 * @param _va kernel virtual address to reverse-map 850 * 851 * @retval pa physical address corresponding to mapping 852 */ 853METHOD vm_paddr_t kextract { 854 mmu_t _mmu; 855 vm_offset_t _va; 856}; 857 858 859/** 860 * @brief Map a wired page into kernel virtual address space 861 * 862 * @param _va mapping virtual address 863 * @param _pa mapping physical address 864 */ 865METHOD void kenter { 866 mmu_t _mmu; 867 vm_offset_t _va; 868 vm_paddr_t _pa; 869}; 870 871/** 872 * @brief Map a wired page into kernel virtual address space 873 * 874 * @param _va mapping virtual address 875 * @param _pa mapping physical address 876 * @param _ma mapping cache control attributes 877 */ 878METHOD void kenter_attr { 879 mmu_t _mmu; 880 vm_offset_t _va; 881 vm_offset_t _pa; 882 vm_memattr_t _ma; 883} DEFAULT mmu_null_kenter_attr; 884 885/** 886 * @brief Determine if the given physical address range has been direct-mapped. 887 * 888 * @param _pa physical address start 889 * @param _size physical address range size 890 * 891 * @retval bool TRUE if the range is direct-mapped. 892 */ 893METHOD boolean_t dev_direct_mapped { 894 mmu_t _mmu; 895 vm_paddr_t _pa; 896 vm_size_t _size; 897}; 898 899 900/** 901 * @brief Enforce instruction cache coherency. Typically called after a 902 * region of memory has been modified and before execution of or within 903 * that region is attempted. Setting breakpoints in a process through 904 * ptrace(2) is one example of when the instruction cache needs to be 905 * made coherent. 906 * 907 * @param _pm the physical map of the virtual address 908 * @param _va the virtual address of the modified region 909 * @param _sz the size of the modified region 910 */ 911METHOD void sync_icache { 912 mmu_t _mmu; 913 pmap_t _pm; 914 vm_offset_t _va; 915 vm_size_t _sz; 916}; 917 918 919/** 920 * @brief Create temporary memory mapping for use by dumpsys(). 921 * 922 * @param _md The memory chunk in which the mapping lies. 923 * @param _ofs The offset within the chunk of the mapping. 924 * @param _sz The requested size of the mapping. 925 * 926 * @retval vm_offset_t The virtual address of the mapping. 927 * 928 * The sz argument is modified to reflect the actual size of the 929 * mapping. 930 */ 931METHOD vm_offset_t dumpsys_map { 932 mmu_t _mmu; 933 struct pmap_md *_md; 934 vm_size_t _ofs; 935 vm_size_t *_sz; 936}; 937 938 939/** 940 * @brief Remove temporary dumpsys() mapping. 941 * 942 * @param _md The memory chunk in which the mapping lies. 943 * @param _ofs The offset within the chunk of the mapping. 944 * @param _va The virtual address of the mapping. 945 */ 946METHOD void dumpsys_unmap { 947 mmu_t _mmu; 948 struct pmap_md *_md; 949 vm_size_t _ofs; 950 vm_offset_t _va; 951}; 952 953 954/** 955 * @brief Scan/iterate memory chunks. 956 * 957 * @param _prev The previously returned chunk or NULL. 958 * 959 * @retval The next (or first when _prev is NULL) chunk. 960 */ 961METHOD struct pmap_md * scan_md { 962 mmu_t _mmu; 963 struct pmap_md *_prev; 964} DEFAULT mmu_null_scan_md; 965