mmu_if.m revision 270439
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: stable/10/sys/powerpc/powerpc/mmu_if.m 270439 2014-08-24 07:53:15Z kib $ 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 _flags pmap_enter flags 244 * @param _psind superpage size index 245 */ 246METHOD int enter { 247 mmu_t _mmu; 248 pmap_t _pmap; 249 vm_offset_t _va; 250 vm_page_t _p; 251 vm_prot_t _prot; 252 u_int _flags; 253 int8_t _psind; 254}; 255 256 257/** 258 * @brief Maps a sequence of resident pages belonging to the same object. 259 * 260 * @param _pmap physical map 261 * @param _start virtual range start 262 * @param _end virtual range end 263 * @param _m_start physical page mapped at start 264 * @param _prot mapping page protection 265 */ 266METHOD void enter_object { 267 mmu_t _mmu; 268 pmap_t _pmap; 269 vm_offset_t _start; 270 vm_offset_t _end; 271 vm_page_t _m_start; 272 vm_prot_t _prot; 273}; 274 275 276/** 277 * @brief A faster entry point for page mapping where it is possible 278 * to short-circuit some of the tests in pmap_enter. 279 * 280 * @param _pmap physical map (and also currently active pmap) 281 * @param _va mapping virtual address 282 * @param _pg mapping physical page 283 * @param _prot new page protection - used to see if page is exec. 284 */ 285METHOD void enter_quick { 286 mmu_t _mmu; 287 pmap_t _pmap; 288 vm_offset_t _va; 289 vm_page_t _pg; 290 vm_prot_t _prot; 291}; 292 293 294/** 295 * @brief Reverse map the given virtual address, returning the physical 296 * page associated with the address if a mapping exists. 297 * 298 * @param _pmap physical map 299 * @param _va mapping virtual address 300 * 301 * @retval 0 No mapping found 302 * @retval addr The mapping physical address 303 */ 304METHOD vm_paddr_t extract { 305 mmu_t _mmu; 306 pmap_t _pmap; 307 vm_offset_t _va; 308}; 309 310 311/** 312 * @brief Reverse map the given virtual address, returning the 313 * physical page if found. The page must be held (by calling 314 * vm_page_hold) if the page protection matches the given protection 315 * 316 * @param _pmap physical map 317 * @param _va mapping virtual address 318 * @param _prot protection used to determine if physical page 319 * should be locked 320 * 321 * @retval NULL No mapping found 322 * @retval page Pointer to physical page. Held if protections match 323 */ 324METHOD vm_page_t extract_and_hold { 325 mmu_t _mmu; 326 pmap_t _pmap; 327 vm_offset_t _va; 328 vm_prot_t _prot; 329}; 330 331 332/** 333 * @brief Increase kernel virtual address space to the given virtual address. 334 * Not really required for PowerPC, so optional unless the MMU implementation 335 * can use it. 336 * 337 * @param _va new upper limit for kernel virtual address space 338 */ 339METHOD void growkernel { 340 mmu_t _mmu; 341 vm_offset_t _va; 342} DEFAULT mmu_null_growkernel; 343 344 345/** 346 * @brief Called from vm_mem_init. Zone allocation is available at 347 * this stage so a convenient time to create zones. This routine is 348 * for MMU-implementation convenience and is optional. 349 */ 350METHOD void init { 351 mmu_t _mmu; 352} DEFAULT mmu_null_init; 353 354 355/** 356 * @brief Return if the page has been marked by MMU hardware to have been 357 * modified 358 * 359 * @param _pg physical page to test 360 * 361 * @retval boolean TRUE if page has been modified 362 */ 363METHOD boolean_t is_modified { 364 mmu_t _mmu; 365 vm_page_t _pg; 366}; 367 368 369/** 370 * @brief Return whether the specified virtual address is a candidate to be 371 * prefaulted in. This routine is optional. 372 * 373 * @param _pmap physical map 374 * @param _va virtual address to test 375 * 376 * @retval boolean TRUE if the address is a candidate. 377 */ 378METHOD boolean_t is_prefaultable { 379 mmu_t _mmu; 380 pmap_t _pmap; 381 vm_offset_t _va; 382} DEFAULT mmu_null_is_prefaultable; 383 384 385/** 386 * @brief Return whether or not the specified physical page was referenced 387 * in any physical maps. 388 * 389 * @params _pg physical page 390 * 391 * @retval boolean TRUE if page has been referenced 392 */ 393METHOD boolean_t is_referenced { 394 mmu_t _mmu; 395 vm_page_t _pg; 396}; 397 398 399/** 400 * @brief Return a count of referenced bits for a page, clearing those bits. 401 * Not all referenced bits need to be cleared, but it is necessary that 0 402 * only be returned when there are none set. 403 * 404 * @params _m physical page 405 * 406 * @retval int count of referenced bits 407 */ 408METHOD int ts_referenced { 409 mmu_t _mmu; 410 vm_page_t _pg; 411}; 412 413 414/** 415 * @brief Map the requested physical address range into kernel virtual 416 * address space. The value in _virt is taken as a hint. The virtual 417 * address of the range is returned, or NULL if the mapping could not 418 * be created. The range can be direct-mapped if that is supported. 419 * 420 * @param *_virt Hint for start virtual address, and also return 421 * value 422 * @param _start physical address range start 423 * @param _end physical address range end 424 * @param _prot protection of range (currently ignored) 425 * 426 * @retval NULL could not map the area 427 * @retval addr, *_virt mapping start virtual address 428 */ 429METHOD vm_offset_t map { 430 mmu_t _mmu; 431 vm_offset_t *_virt; 432 vm_paddr_t _start; 433 vm_paddr_t _end; 434 int _prot; 435}; 436 437 438/** 439 * @brief Used to create a contiguous set of read-only mappings for a 440 * given object to try and eliminate a cascade of on-demand faults as 441 * the object is accessed sequentially. This routine is optional. 442 * 443 * @param _pmap physical map 444 * @param _addr mapping start virtual address 445 * @param _object device-backed V.M. object to be mapped 446 * @param _pindex page-index within object of mapping start 447 * @param _size size in bytes of mapping 448 */ 449METHOD void object_init_pt { 450 mmu_t _mmu; 451 pmap_t _pmap; 452 vm_offset_t _addr; 453 vm_object_t _object; 454 vm_pindex_t _pindex; 455 vm_size_t _size; 456} DEFAULT mmu_null_object_init_pt; 457 458 459/** 460 * @brief Used to determine if the specified page has a mapping for the 461 * given physical map, by scanning the list of reverse-mappings from the 462 * page. The list is scanned to a maximum of 16 entries. 463 * 464 * @param _pmap physical map 465 * @param _pg physical page 466 * 467 * @retval bool TRUE if the physical map was found in the first 16 468 * reverse-map list entries off the physical page. 469 */ 470METHOD boolean_t page_exists_quick { 471 mmu_t _mmu; 472 pmap_t _pmap; 473 vm_page_t _pg; 474}; 475 476 477/** 478 * @brief Initialise the machine-dependent section of the physical page 479 * data structure. This routine is optional. 480 * 481 * @param _pg physical page 482 */ 483METHOD void page_init { 484 mmu_t _mmu; 485 vm_page_t _pg; 486} DEFAULT mmu_null_page_init; 487 488 489/** 490 * @brief Count the number of managed mappings to the given physical 491 * page that are wired. 492 * 493 * @param _pg physical page 494 * 495 * @retval int the number of wired, managed mappings to the 496 * given physical page 497 */ 498METHOD int page_wired_mappings { 499 mmu_t _mmu; 500 vm_page_t _pg; 501}; 502 503 504/** 505 * @brief Initialise a physical map data structure 506 * 507 * @param _pmap physical map 508 */ 509METHOD void pinit { 510 mmu_t _mmu; 511 pmap_t _pmap; 512}; 513 514 515/** 516 * @brief Initialise the physical map for process 0, the initial process 517 * in the system. 518 * XXX default to pinit ? 519 * 520 * @param _pmap physical map 521 */ 522METHOD void pinit0 { 523 mmu_t _mmu; 524 pmap_t _pmap; 525}; 526 527 528/** 529 * @brief Set the protection for physical pages in the given virtual address 530 * range to the given value. 531 * 532 * @param _pmap physical map 533 * @param _start virtual range start 534 * @param _end virtual range end 535 * @param _prot new page protection 536 */ 537METHOD void protect { 538 mmu_t _mmu; 539 pmap_t _pmap; 540 vm_offset_t _start; 541 vm_offset_t _end; 542 vm_prot_t _prot; 543}; 544 545 546/** 547 * @brief Create a mapping in kernel virtual address space for the given array 548 * of wired physical pages. 549 * 550 * @param _start mapping virtual address start 551 * @param *_m array of physical page pointers 552 * @param _count array elements 553 */ 554METHOD void qenter { 555 mmu_t _mmu; 556 vm_offset_t _start; 557 vm_page_t *_pg; 558 int _count; 559}; 560 561 562/** 563 * @brief Remove the temporary mappings created by qenter. 564 * 565 * @param _start mapping virtual address start 566 * @param _count number of pages in mapping 567 */ 568METHOD void qremove { 569 mmu_t _mmu; 570 vm_offset_t _start; 571 int _count; 572}; 573 574 575/** 576 * @brief Release per-pmap resources, e.g. mutexes, allocated memory etc. There 577 * should be no existing mappings for the physical map at this point 578 * 579 * @param _pmap physical map 580 */ 581METHOD void release { 582 mmu_t _mmu; 583 pmap_t _pmap; 584}; 585 586 587/** 588 * @brief Remove all mappings in the given physical map for the start/end 589 * virtual address range. The range will be page-aligned. 590 * 591 * @param _pmap physical map 592 * @param _start mapping virtual address start 593 * @param _end mapping virtual address end 594 */ 595METHOD void remove { 596 mmu_t _mmu; 597 pmap_t _pmap; 598 vm_offset_t _start; 599 vm_offset_t _end; 600}; 601 602 603/** 604 * @brief Traverse the reverse-map list off the given physical page and 605 * remove all mappings. Clear the PGA_WRITEABLE attribute from the page. 606 * 607 * @param _pg physical page 608 */ 609METHOD void remove_all { 610 mmu_t _mmu; 611 vm_page_t _pg; 612}; 613 614 615/** 616 * @brief Remove all mappings in the given start/end virtual address range 617 * for the given physical map. Similar to the remove method, but it used 618 * when tearing down all mappings in an address space. This method is 619 * optional, since pmap_remove will be called for each valid vm_map in 620 * the address space later. 621 * 622 * @param _pmap physical map 623 * @param _start mapping virtual address start 624 * @param _end mapping virtual address end 625 */ 626METHOD void remove_pages { 627 mmu_t _mmu; 628 pmap_t _pmap; 629} DEFAULT mmu_null_remove_pages; 630 631 632/** 633 * @brief Zero a physical page. It is not assumed that the page is mapped, 634 * so a temporary (or direct) mapping may need to be used. 635 * 636 * @param _pg physical page 637 */ 638METHOD void zero_page { 639 mmu_t _mmu; 640 vm_page_t _pg; 641}; 642 643 644/** 645 * @brief Zero a portion of a physical page, starting at a given offset and 646 * for a given size (multiples of 512 bytes for 4k pages). 647 * 648 * @param _pg physical page 649 * @param _off byte offset from start of page 650 * @param _size size of area to zero 651 */ 652METHOD void zero_page_area { 653 mmu_t _mmu; 654 vm_page_t _pg; 655 int _off; 656 int _size; 657}; 658 659 660/** 661 * @brief Called from the idle loop to zero pages. XXX I think locking 662 * constraints might be different here compared to zero_page. 663 * 664 * @param _pg physical page 665 */ 666METHOD void zero_page_idle { 667 mmu_t _mmu; 668 vm_page_t _pg; 669}; 670 671 672/** 673 * @brief Extract mincore(2) information from a mapping. 674 * 675 * @param _pmap physical map 676 * @param _addr page virtual address 677 * @param _locked_pa page physical address 678 * 679 * @retval 0 no result 680 * @retval non-zero mincore(2) flag values 681 */ 682METHOD int mincore { 683 mmu_t _mmu; 684 pmap_t _pmap; 685 vm_offset_t _addr; 686 vm_paddr_t *_locked_pa; 687} DEFAULT mmu_null_mincore; 688 689 690/** 691 * @brief Perform any operations required to allow a physical map to be used 692 * before it's address space is accessed. 693 * 694 * @param _td thread associated with physical map 695 */ 696METHOD void activate { 697 mmu_t _mmu; 698 struct thread *_td; 699}; 700 701/** 702 * @brief Perform any operations required to deactivate a physical map, 703 * for instance as it is context-switched out. 704 * 705 * @param _td thread associated with physical map 706 */ 707METHOD void deactivate { 708 mmu_t _mmu; 709 struct thread *_td; 710} DEFAULT mmu_null_deactivate; 711 712/** 713 * @brief Return a hint for the best virtual address to map a tentative 714 * virtual address range in a given VM object. The default is to just 715 * return the given tentative start address. 716 * 717 * @param _obj VM backing object 718 * @param _offset starting offset with the VM object 719 * @param _addr initial guess at virtual address 720 * @param _size size of virtual address range 721 */ 722METHOD void align_superpage { 723 mmu_t _mmu; 724 vm_object_t _obj; 725 vm_ooffset_t _offset; 726 vm_offset_t *_addr; 727 vm_size_t _size; 728} DEFAULT mmu_null_align_superpage; 729 730 731 732 733/** 734 * INTERNAL INTERFACES 735 */ 736 737/** 738 * @brief Bootstrap the VM system. At the completion of this routine, the 739 * kernel will be running in it's own address space with full control over 740 * paging. 741 * 742 * @param _start start of reserved memory (obsolete ???) 743 * @param _end end of reserved memory (obsolete ???) 744 * XXX I think the intent of these was to allow 745 * the memory used by kernel text+data+bss and 746 * loader variables/load-time kld's to be carved out 747 * of available physical mem. 748 * 749 */ 750METHOD void bootstrap { 751 mmu_t _mmu; 752 vm_offset_t _start; 753 vm_offset_t _end; 754}; 755 756/** 757 * @brief Set up the MMU on the current CPU. Only called by the PMAP layer 758 * for alternate CPUs on SMP systems. 759 * 760 * @param _ap Set to 1 if the CPU being set up is an AP 761 * 762 */ 763METHOD void cpu_bootstrap { 764 mmu_t _mmu; 765 int _ap; 766}; 767 768 769/** 770 * @brief Create a kernel mapping for a given physical address range. 771 * Called by bus code on behalf of device drivers. The mapping does not 772 * have to be a virtual address: it can be a direct-mapped physical address 773 * if that is supported by the MMU. 774 * 775 * @param _pa start physical address 776 * @param _size size in bytes of mapping 777 * 778 * @retval addr address of mapping. 779 */ 780METHOD void * mapdev { 781 mmu_t _mmu; 782 vm_paddr_t _pa; 783 vm_size_t _size; 784}; 785 786/** 787 * @brief Create a kernel mapping for a given physical address range. 788 * Called by bus code on behalf of device drivers. The mapping does not 789 * have to be a virtual address: it can be a direct-mapped physical address 790 * if that is supported by the MMU. 791 * 792 * @param _pa start physical address 793 * @param _size size in bytes of mapping 794 * @param _attr cache attributes 795 * 796 * @retval addr address of mapping. 797 */ 798METHOD void * mapdev_attr { 799 mmu_t _mmu; 800 vm_offset_t _pa; 801 vm_size_t _size; 802 vm_memattr_t _attr; 803} DEFAULT mmu_null_mapdev_attr; 804 805/** 806 * @brief Change cache control attributes for a page. Should modify all 807 * mappings for that page. 808 * 809 * @param _m page to modify 810 * @param _ma new cache control attributes 811 */ 812METHOD void page_set_memattr { 813 mmu_t _mmu; 814 vm_page_t _pg; 815 vm_memattr_t _ma; 816} DEFAULT mmu_null_page_set_memattr; 817 818/** 819 * @brief Remove the mapping created by mapdev. Called when a driver 820 * is unloaded. 821 * 822 * @param _va Mapping address returned from mapdev 823 * @param _size size in bytes of mapping 824 */ 825METHOD void unmapdev { 826 mmu_t _mmu; 827 vm_offset_t _va; 828 vm_size_t _size; 829}; 830 831 832/** 833 * @brief Reverse-map a kernel virtual address 834 * 835 * @param _va kernel virtual address to reverse-map 836 * 837 * @retval pa physical address corresponding to mapping 838 */ 839METHOD vm_paddr_t kextract { 840 mmu_t _mmu; 841 vm_offset_t _va; 842}; 843 844 845/** 846 * @brief Map a wired page into kernel virtual address space 847 * 848 * @param _va mapping virtual address 849 * @param _pa mapping physical address 850 */ 851METHOD void kenter { 852 mmu_t _mmu; 853 vm_offset_t _va; 854 vm_paddr_t _pa; 855}; 856 857/** 858 * @brief Map a wired page into kernel virtual address space 859 * 860 * @param _va mapping virtual address 861 * @param _pa mapping physical address 862 * @param _ma mapping cache control attributes 863 */ 864METHOD void kenter_attr { 865 mmu_t _mmu; 866 vm_offset_t _va; 867 vm_offset_t _pa; 868 vm_memattr_t _ma; 869} DEFAULT mmu_null_kenter_attr; 870 871/** 872 * @brief Determine if the given physical address range has been direct-mapped. 873 * 874 * @param _pa physical address start 875 * @param _size physical address range size 876 * 877 * @retval bool TRUE if the range is direct-mapped. 878 */ 879METHOD boolean_t dev_direct_mapped { 880 mmu_t _mmu; 881 vm_paddr_t _pa; 882 vm_size_t _size; 883}; 884 885 886/** 887 * @brief Enforce instruction cache coherency. Typically called after a 888 * region of memory has been modified and before execution of or within 889 * that region is attempted. Setting breakpoints in a process through 890 * ptrace(2) is one example of when the instruction cache needs to be 891 * made coherent. 892 * 893 * @param _pm the physical map of the virtual address 894 * @param _va the virtual address of the modified region 895 * @param _sz the size of the modified region 896 */ 897METHOD void sync_icache { 898 mmu_t _mmu; 899 pmap_t _pm; 900 vm_offset_t _va; 901 vm_size_t _sz; 902}; 903 904 905/** 906 * @brief Create temporary memory mapping for use by dumpsys(). 907 * 908 * @param _md The memory chunk in which the mapping lies. 909 * @param _ofs The offset within the chunk of the mapping. 910 * @param _sz The requested size of the mapping. 911 * 912 * @retval vm_offset_t The virtual address of the mapping. 913 * 914 * The sz argument is modified to reflect the actual size of the 915 * mapping. 916 */ 917METHOD vm_offset_t dumpsys_map { 918 mmu_t _mmu; 919 struct pmap_md *_md; 920 vm_size_t _ofs; 921 vm_size_t *_sz; 922}; 923 924 925/** 926 * @brief Remove temporary dumpsys() mapping. 927 * 928 * @param _md The memory chunk in which the mapping lies. 929 * @param _ofs The offset within the chunk of the mapping. 930 * @param _va The virtual address of the mapping. 931 */ 932METHOD void dumpsys_unmap { 933 mmu_t _mmu; 934 struct pmap_md *_md; 935 vm_size_t _ofs; 936 vm_offset_t _va; 937}; 938 939 940/** 941 * @brief Scan/iterate memory chunks. 942 * 943 * @param _prev The previously returned chunk or NULL. 944 * 945 * @retval The next (or first when _prev is NULL) chunk. 946 */ 947METHOD struct pmap_md * scan_md { 948 mmu_t _mmu; 949 struct pmap_md *_prev; 950} DEFAULT mmu_null_scan_md; 951