memory.h

   1 /*
   2  * Physical memory management API
   3  *
   4  * Copyright 2011 Red Hat, Inc. and/or its affiliates
   5  *
   6  * Authors:
   7  *  Avi Kivity <avi@redhat.com>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2.  See
  10  * the COPYING file in the top-level directory.
  11  *
  12  */
  13
  14 #ifndef MEMORY_H
  15 #define MEMORY_H
  16
  17 #ifndef CONFIG_USER_ONLY
  18
  19 #include <stdint.h>
  20 #include <stdbool.h>
  21 #include "qemu-common.h"
  22 #include "cpu-common.h"
  23 #include "targphys.h"
  24 #include "qemu-queue.h"
  25 #include "iorange.h"
  26 #include "ioport.h"
  27 #include "int128.h"
  28
  29 typedef struct MemoryRegionOps MemoryRegionOps;
  30 typedef struct MemoryRegion MemoryRegion;
  31 typedef struct MemoryRegionPortio MemoryRegionPortio;
  32 typedef struct MemoryRegionMmio MemoryRegionMmio;
  33
  34 /* Must match *_DIRTY_FLAGS in cpu-all.h.  To be replaced with dynamic
  35  * registration.
  36  */
  37 #define DIRTY_MEMORY_VGA       0
  38 #define DIRTY_MEMORY_CODE      1
  39 #define DIRTY_MEMORY_MIGRATION 3
  40
  41 struct MemoryRegionMmio {
  42     CPUReadMemoryFunc *read[3];
  43     CPUWriteMemoryFunc *write[3];
  44 };
  45
  46 /* Internal use; thunks between old-style IORange and MemoryRegions. */
  47 typedef struct MemoryRegionIORange MemoryRegionIORange;
  48 struct MemoryRegionIORange {
  49     IORange iorange;
  50     MemoryRegion *mr;
  51     target_phys_addr_t offset;
  52 };
  53
  54 /*
  55  * Memory region callbacks
  56  */
  57 struct MemoryRegionOps {
  58     /* Read from the memory region. @addr is relative to @mr; @size is
  59      * in bytes. */
  60     uint64_t (*read)(void *opaque,
  61                      target_phys_addr_t addr,
  62                      unsigned size);
  63     /* Write to the memory region. @addr is relative to @mr; @size is
  64      * in bytes. */
  65     void (*write)(void *opaque,
  66                   target_phys_addr_t addr,
  67                   uint64_t data,
  68                   unsigned size);
  69
  70     enum device_endian endianness;
  71     /* Guest-visible constraints: */
  72     struct {
  73         /* If nonzero, specify bounds on access sizes beyond which a machine
  74          * check is thrown.
  75          */
  76         unsigned min_access_size;
  77         unsigned max_access_size;
  78         /* If true, unaligned accesses are supported.  Otherwise unaligned
  79          * accesses throw machine checks.
  80          */
  81          bool unaligned;
  82         /*
  83          * If present, and returns #false, the transaction is not accepted
  84          * by the device (and results in machine dependent behaviour such
  85          * as a machine check exception).
  86          */
  87         bool (*accepts)(void *opaque, target_phys_addr_t addr,
  88                         unsigned size, bool is_write);
  89     } valid;
  90     /* Internal implementation constraints: */
  91     struct {
  92         /* If nonzero, specifies the minimum size implemented.  Smaller sizes
  93          * will be rounded upwards and a partial result will be returned.
  94          */
  95         unsigned min_access_size;
  96         /* If nonzero, specifies the maximum size implemented.  Larger sizes
  97          * will be done as a series of accesses with smaller sizes.
  98          */
  99         unsigned max_access_size;
 100         /* If true, unaligned accesses are supported.  Otherwise all accesses
 101          * are converted to (possibly multiple) naturally aligned accesses.
 102          */
 103          bool unaligned;
 104     } impl;
 105
 106     /* If .read and .write are not present, old_portio may be used for
 107      * backwards compatibility with old portio registration
 108      */
 109     const MemoryRegionPortio *old_portio;
 110     /* If .read and .write are not present, old_mmio may be used for
 111      * backwards compatibility with old mmio registration
 112      */
 113     const MemoryRegionMmio old_mmio;
 114 };
 115
 116 typedef struct CoalescedMemoryRange CoalescedMemoryRange;
 117 typedef struct MemoryRegionIoeventfd MemoryRegionIoeventfd;
 118
 119 struct MemoryRegion {
 120     /* All fields are private - violators will be prosecuted */
 121     const MemoryRegionOps *ops;
 122     void *opaque;
 123     MemoryRegion *parent;
 124     Int128 size;
 125     target_phys_addr_t addr;
 126     void (*destructor)(MemoryRegion *mr);
 127     ram_addr_t ram_addr;
 128     bool subpage;
 129     bool terminates;
 130     bool readable;
 131     bool ram;
 132     bool readonly; /* For RAM regions */
 133     bool enabled;
 134     bool rom_device;
 135     bool warning_printed; /* For reservations */
 136     bool flush_coalesced_mmio;
 137     MemoryRegion *alias;
 138     target_phys_addr_t alias_offset;
 139     unsigned priority;
 140     bool may_overlap;
 141     QTAILQ_HEAD(subregions, MemoryRegion) subregions;
 142     QTAILQ_ENTRY(MemoryRegion) subregions_link;
 143     QTAILQ_HEAD(coalesced_ranges, CoalescedMemoryRange) coalesced;
 144     const char *name;
 145     uint8_t dirty_log_mask;
 146     unsigned ioeventfd_nb;
 147     MemoryRegionIoeventfd *ioeventfds;
 148 };
 149
 150 struct MemoryRegionPortio {
 151     uint32_t offset;
 152     uint32_t len;
 153     unsigned size;
 154     IOPortReadFunc *read;
 155     IOPortWriteFunc *write;
 156 };
 157
 158 #define PORTIO_END_OF_LIST() { }
 159
 160 typedef struct MemoryRegionSection MemoryRegionSection;
 161
 162 /**
 163  * MemoryRegionSection: describes a fragment of a #MemoryRegion
 164  *
 165  * @mr: the region, or %NULL if empty
 166  * @address_space: the address space the region is mapped in
 167  * @offset_within_region: the beginning of the section, relative to @mr's start
 168  * @size: the size of the section; will not exceed @mr's boundaries
 169  * @offset_within_address_space: the address of the first byte of the section
 170  *     relative to the region's address space
 171  * @readonly: writes to this section are ignored
 172  */
 173 struct MemoryRegionSection {
 174     MemoryRegion *mr;
 175     MemoryRegion *address_space;
 176     target_phys_addr_t offset_within_region;
 177     uint64_t size;
 178     target_phys_addr_t offset_within_address_space;
 179     bool readonly;
 180 };
 181
 182 typedef struct MemoryListener MemoryListener;
 183
 184 /**
 185  * MemoryListener: callbacks structure for updates to the physical memory map
 186  *
 187  * Allows a component to adjust to changes in the guest-visible memory map.
 188  * Use with memory_listener_register() and memory_listener_unregister().
 189  */
 190 struct MemoryListener {
 191     void (*begin)(MemoryListener *listener);
 192     void (*commit)(MemoryListener *listener);
 193     void (*region_add)(MemoryListener *listener, MemoryRegionSection *section);
 194     void (*region_del)(MemoryListener *listener, MemoryRegionSection *section);
 195     void (*region_nop)(MemoryListener *listener, MemoryRegionSection *section);
 196     void (*log_start)(MemoryListener *listener, MemoryRegionSection *section);
 197     void (*log_stop)(MemoryListener *listener, MemoryRegionSection *section);
 198     void (*log_sync)(MemoryListener *listener, MemoryRegionSection *section);
 199     void (*log_global_start)(MemoryListener *listener);
 200     void (*log_global_stop)(MemoryListener *listener);
 201     void (*eventfd_add)(MemoryListener *listener, MemoryRegionSection *section,
 202                         bool match_data, uint64_t data, EventNotifier *e);
 203     void (*eventfd_del)(MemoryListener *listener, MemoryRegionSection *section,
 204                         bool match_data, uint64_t data, EventNotifier *e);
 205     /* Lower = earlier (during add), later (during del) */
 206     unsigned priority;
 207     MemoryRegion *address_space_filter;
 208     QTAILQ_ENTRY(MemoryListener) link;
 209 };
 210
 211 /**
 212  * memory_region_init: Initialize a memory region
 213  *
 214  * The region typically acts as a container for other memory regions.  Use
 215  * memory_region_add_subregion() to add subregions.
 216  *
 217  * @mr: the #MemoryRegion to be initialized
 218  * @name: used for debugging; not visible to the user or ABI
 219  * @size: size of the region; any subregions beyond this size will be clipped
 220  */
 221 void memory_region_init(MemoryRegion *mr,
 222                         const char *name,
 223                         uint64_t size);
 224 /**
 225  * memory_region_init_io: Initialize an I/O memory region.
 226  *
 227  * Accesses into the region will cause the callbacks in @ops to be called.
 228  * if @size is nonzero, subregions will be clipped to @size.
 229  *
 230  * @mr: the #MemoryRegion to be initialized.
 231  * @ops: a structure containing read and write callbacks to be used when
 232  *       I/O is performed on the region.
 233  * @opaque: passed to to the read and write callbacks of the @ops structure.
 234  * @name: used for debugging; not visible to the user or ABI
 235  * @size: size of the region.
 236  */
 237 void memory_region_init_io(MemoryRegion *mr,
 238                            const MemoryRegionOps *ops,
 239                            void *opaque,
 240                            const char *name,
 241                            uint64_t size);
 242
 243 /**
 244  * memory_region_init_ram:  Initialize RAM memory region.  Accesses into the
 245  *                          region will modify memory directly.
 246  *
 247  * @mr: the #MemoryRegion to be initialized.
 248  * @name: the name of the region.
 249  * @size: size of the region.
 250  */
 251 void memory_region_init_ram(MemoryRegion *mr,
 252                             const char *name,
 253                             uint64_t size);
 254
 255 /**
 256  * memory_region_init_ram_ptr:  Initialize RAM memory region from a
 257  *                              user-provided pointer.  Accesses into the
 258  *                              region will modify memory directly.
 259  *
 260  * @mr: the #MemoryRegion to be initialized.
 261  * @name: the name of the region.
 262  * @size: size of the region.
 263  * @ptr: memory to be mapped; must contain at least @size bytes.
 264  */
 265 void memory_region_init_ram_ptr(MemoryRegion *mr,
 266                                 const char *name,
 267                                 uint64_t size,
 268                                 void *ptr);
 269
 270 /**
 271  * memory_region_init_alias: Initialize a memory region that aliases all or a
 272  *                           part of another memory region.
 273  *
 274  * @mr: the #MemoryRegion to be initialized.
 275  * @name: used for debugging; not visible to the user or ABI
 276  * @orig: the region to be referenced; @mr will be equivalent to
 277  *        @orig between @offset and @offset + @size - 1.
 278  * @offset: start of the section in @orig to be referenced.
 279  * @size: size of the region.
 280  */
 281 void memory_region_init_alias(MemoryRegion *mr,
 282                               const char *name,
 283                               MemoryRegion *orig,
 284                               target_phys_addr_t offset,
 285                               uint64_t size);
 286
 287 /**
 288  * memory_region_init_rom_device:  Initialize a ROM memory region.  Writes are
 289  *                                 handled via callbacks.
 290  *
 291  * @mr: the #MemoryRegion to be initialized.
 292  * @ops: callbacks for write access handling.
 293  * @name: the name of the region.
 294  * @size: size of the region.
 295  */
 296 void memory_region_init_rom_device(MemoryRegion *mr,
 297                                    const MemoryRegionOps *ops,
 298                                    void *opaque,
 299                                    const char *name,
 300                                    uint64_t size);
 301
 302 /**
 303  * memory_region_init_reservation: Initialize a memory region that reserves
 304  *                                 I/O space.
 305  *
 306  * A reservation region primariy serves debugging purposes.  It claims I/O
 307  * space that is not supposed to be handled by QEMU itself.  Any access via
 308  * the memory API will cause an abort().
 309  *
 310  * @mr: the #MemoryRegion to be initialized
 311  * @name: used for debugging; not visible to the user or ABI
 312  * @size: size of the region.
 313  */
 314 void memory_region_init_reservation(MemoryRegion *mr,
 315                                     const char *name,
 316                                     uint64_t size);
 317 /**
 318  * memory_region_destroy: Destroy a memory region and reclaim all resources.
 319  *
 320  * @mr: the region to be destroyed.  May not currently be a subregion
 321  *      (see memory_region_add_subregion()) or referenced in an alias
 322  *      (see memory_region_init_alias()).
 323  */
 324 void memory_region_destroy(MemoryRegion *mr);
 325
 326 /**
 327  * memory_region_size: get a memory region's size.
 328  *
 329  * @mr: the memory region being queried.
 330  */
 331 uint64_t memory_region_size(MemoryRegion *mr);
 332
 333 /**
 334  * memory_region_is_ram: check whether a memory region is random access
 335  *
 336  * Returns %true is a memory region is random access.
 337  *
 338  * @mr: the memory region being queried
 339  */
 340 bool memory_region_is_ram(MemoryRegion *mr);
 341
 342 /**
 343  * memory_region_is_romd: check whether a memory region is ROMD
 344  *
 345  * Returns %true is a memory region is ROMD and currently set to allow
 346  * direct reads.
 347  *
 348  * @mr: the memory region being queried
 349  */
 350 static inline bool memory_region_is_romd(MemoryRegion *mr)
 351 {
 352     return mr->rom_device && mr->readable;
 353 }
 354
 355 /**
 356  * memory_region_name: get a memory region's name
 357  *
 358  * Returns the string that was used to initialize the memory region.
 359  *
 360  * @mr: the memory region being queried
 361  */
 362 const char *memory_region_name(MemoryRegion *mr);
 363
 364 /**
 365  * memory_region_is_logging: return whether a memory region is logging writes
 366  *
 367  * Returns %true if the memory region is logging writes
 368  *
 369  * @mr: the memory region being queried
 370  */
 371 bool memory_region_is_logging(MemoryRegion *mr);
 372
 373 /**
 374  * memory_region_is_rom: check whether a memory region is ROM
 375  *
 376  * Returns %true is a memory region is read-only memory.
 377  *
 378  * @mr: the memory region being queried
 379  */
 380 bool memory_region_is_rom(MemoryRegion *mr);
 381
 382 /**
 383  * memory_region_get_ram_ptr: Get a pointer into a RAM memory region.
 384  *
 385  * Returns a host pointer to a RAM memory region (created with
 386  * memory_region_init_ram() or memory_region_init_ram_ptr()).  Use with
 387  * care.
 388  *
 389  * @mr: the memory region being queried.
 390  */
 391 void *memory_region_get_ram_ptr(MemoryRegion *mr);
 392
 393 /**
 394  * memory_region_set_log: Turn dirty logging on or off for a region.
 395  *
 396  * Turns dirty logging on or off for a specified client (display, migration).
 397  * Only meaningful for RAM regions.
 398  *
 399  * @mr: the memory region being updated.
 400  * @log: whether dirty logging is to be enabled or disabled.
 401  * @client: the user of the logging information; %DIRTY_MEMORY_MIGRATION or
 402  *          %DIRTY_MEMORY_VGA.
 403  */
 404 void memory_region_set_log(MemoryRegion *mr, bool log, unsigned client);
 405
 406 /**
 407  * memory_region_get_dirty: Check whether a range of bytes is dirty
 408  *                          for a specified client.
 409  *
 410  * Checks whether a range of bytes has been written to since the last
 411  * call to memory_region_reset_dirty() with the same @client.  Dirty logging
 412  * must be enabled.
 413  *
 414  * @mr: the memory region being queried.
 415  * @addr: the address (relative to the start of the region) being queried.
 416  * @size: the size of the range being queried.
 417  * @client: the user of the logging information; %DIRTY_MEMORY_MIGRATION or
 418  *          %DIRTY_MEMORY_VGA.
 419  */
 420 bool memory_region_get_dirty(MemoryRegion *mr, target_phys_addr_t addr,
 421                              target_phys_addr_t size, unsigned client);
 422
 423 /**
 424  * memory_region_set_dirty: Mark a range of bytes as dirty in a memory region.
 425  *
 426  * Marks a range of bytes as dirty, after it has been dirtied outside
 427  * guest code.
 428  *
 429  * @mr: the memory region being dirtied.
 430  * @addr: the address (relative to the start of the region) being dirtied.
 431  * @size: size of the range being dirtied.
 432  */
 433 void memory_region_set_dirty(MemoryRegion *mr, target_phys_addr_t addr,
 434                              target_phys_addr_t size);
 435
 436 /**
 437  * memory_region_sync_dirty_bitmap: Synchronize a region's dirty bitmap with
 438  *                                  any external TLBs (e.g. kvm)
 439  *
 440  * Flushes dirty information from accelerators such as kvm and vhost-net
 441  * and makes it available to users of the memory API.
 442  *
 443  * @mr: the region being flushed.
 444  */
 445 void memory_region_sync_dirty_bitmap(MemoryRegion *mr);
 446
 447 /**
 448  * memory_region_reset_dirty: Mark a range of pages as clean, for a specified
 449  *                            client.
 450  *
 451  * Marks a range of pages as no longer dirty.
 452  *
 453  * @mr: the region being updated.
 454  * @addr: the start of the subrange being cleaned.
 455  * @size: the size of the subrange being cleaned.
 456  * @client: the user of the logging information; %DIRTY_MEMORY_MIGRATION or
 457  *          %DIRTY_MEMORY_VGA.
 458  */
 459 void memory_region_reset_dirty(MemoryRegion *mr, target_phys_addr_t addr,
 460                                target_phys_addr_t size, unsigned client);
 461
 462 /**
 463  * memory_region_set_readonly: Turn a memory region read-only (or read-write)
 464  *
 465  * Allows a memory region to be marked as read-only (turning it into a ROM).
 466  * only useful on RAM regions.
 467  *
 468  * @mr: the region being updated.
 469  * @readonly: whether rhe region is to be ROM or RAM.
 470  */
 471 void memory_region_set_readonly(MemoryRegion *mr, bool readonly);
 472
 473 /**
 474  * memory_region_rom_device_set_readable: enable/disable ROM readability
 475  *
 476  * Allows a ROM device (initialized with memory_region_init_rom_device() to
 477  * to be marked as readable (default) or not readable.  When it is readable,
 478  * the device is mapped to guest memory.  When not readable, reads are
 479  * forwarded to the #MemoryRegion.read function.
 480  *
 481  * @mr: the memory region to be updated
 482  * @readable: whether reads are satisified directly (%true) or via callbacks
 483  *            (%false)
 484  */
 485 void memory_region_rom_device_set_readable(MemoryRegion *mr, bool readable);
 486
 487 /**
 488  * memory_region_set_coalescing: Enable memory coalescing for the region.
 489  *
 490  * Enabled writes to a region to be queued for later processing. MMIO ->write
 491  * callbacks may be delayed until a non-coalesced MMIO is issued.
 492  * Only useful for IO regions.  Roughly similar to write-combining hardware.
 493  *
 494  * @mr: the memory region to be write coalesced
 495  */
 496 void memory_region_set_coalescing(MemoryRegion *mr);
 497
 498 /**
 499  * memory_region_add_coalescing: Enable memory coalescing for a sub-range of
 500  *                               a region.
 501  *
 502  * Like memory_region_set_coalescing(), but works on a sub-range of a region.
 503  * Multiple calls can be issued coalesced disjoint ranges.
 504  *
 505  * @mr: the memory region to be updated.
 506  * @offset: the start of the range within the region to be coalesced.
 507  * @size: the size of the subrange to be coalesced.
 508  */
 509 void memory_region_add_coalescing(MemoryRegion *mr,
 510                                   target_phys_addr_t offset,
 511                                   uint64_t size);
 512
 513 /**
 514  * memory_region_clear_coalescing: Disable MMIO coalescing for the region.
 515  *
 516  * Disables any coalescing caused by memory_region_set_coalescing() or
 517  * memory_region_add_coalescing().  Roughly equivalent to uncacheble memory
 518  * hardware.
 519  *
 520  * @mr: the memory region to be updated.
 521  */
 522 void memory_region_clear_coalescing(MemoryRegion *mr);
 523
 524 /**
 525  * memory_region_set_flush_coalesced: Enforce memory coalescing flush before
 526  *                                    accesses.
 527  *
 528  * Ensure that pending coalesced MMIO request are flushed before the memory
 529  * region is accessed. This property is automatically enabled for all regions
 530  * passed to memory_region_set_coalescing() and memory_region_add_coalescing().
 531  *
 532  * @mr: the memory region to be updated.
 533  */
 534 void memory_region_set_flush_coalesced(MemoryRegion *mr);
 535
 536 /**
 537  * memory_region_clear_flush_coalesced: Disable memory coalescing flush before
 538  *                                      accesses.
 539  *
 540  * Clear the automatic coalesced MMIO flushing enabled via
 541  * memory_region_set_flush_coalesced. Note that this service has no effect on
 542  * memory regions that have MMIO coalescing enabled for themselves. For them,
 543  * automatic flushing will stop once coalescing is disabled.
 544  *
 545  * @mr: the memory region to be updated.
 546  */
 547 void memory_region_clear_flush_coalesced(MemoryRegion *mr);
 548
 549 /**
 550  * memory_region_add_eventfd: Request an eventfd to be triggered when a word
 551  *                            is written to a location.
 552  *
 553  * Marks a word in an IO region (initialized with memory_region_init_io())
 554  * as a trigger for an eventfd event.  The I/O callback will not be called.
 555  * The caller must be prepared to handle failure (that is, take the required
 556  * action if the callback _is_ called).
 557  *
 558  * @mr: the memory region being updated.
 559  * @addr: the address within @mr that is to be monitored
 560  * @size: the size of the access to trigger the eventfd
 561  * @match_data: whether to match against @data, instead of just @addr
 562  * @data: the data to match against the guest write
 563  * @fd: the eventfd to be triggered when @addr, @size, and @data all match.
 564  **/
 565 void memory_region_add_eventfd(MemoryRegion *mr,
 566                                target_phys_addr_t addr,
 567                                unsigned size,
 568                                bool match_data,
 569                                uint64_t data,
 570                                EventNotifier *e);
 571
 572 /**
 573  * memory_region_del_eventfd: Cancel an eventfd.
 574  *
 575  * Cancels an eventfd trigger requested by a previous
 576  * memory_region_add_eventfd() call.
 577  *
 578  * @mr: the memory region being updated.
 579  * @addr: the address within @mr that is to be monitored
 580  * @size: the size of the access to trigger the eventfd
 581  * @match_data: whether to match against @data, instead of just @addr
 582  * @data: the data to match against the guest write
 583  * @fd: the eventfd to be triggered when @addr, @size, and @data all match.
 584  */
 585 void memory_region_del_eventfd(MemoryRegion *mr,
 586                                target_phys_addr_t addr,
 587                                unsigned size,
 588                                bool match_data,
 589                                uint64_t data,
 590                                EventNotifier *e);
 591
 592 /**
 593  * memory_region_add_subregion: Add a subregion to a container.
 594  *
 595  * Adds a subregion at @offset.  The subregion may not overlap with other
 596  * subregions (except for those explicitly marked as overlapping).  A region
 597  * may only be added once as a subregion (unless removed with
 598  * memory_region_del_subregion()); use memory_region_init_alias() if you
 599  * want a region to be a subregion in multiple locations.
 600  *
 601  * @mr: the region to contain the new subregion; must be a container
 602  *      initialized with memory_region_init().
 603  * @offset: the offset relative to @mr where @subregion is added.
 604  * @subregion: the subregion to be added.
 605  */
 606 void memory_region_add_subregion(MemoryRegion *mr,
 607                                  target_phys_addr_t offset,
 608                                  MemoryRegion *subregion);
 609 /**
 610  * memory_region_add_subregion_overlap: Add a subregion to a container
 611  *                                      with overlap.
 612  *
 613  * Adds a subregion at @offset.  The subregion may overlap with other
 614  * subregions.  Conflicts are resolved by having a higher @priority hide a
 615  * lower @priority. Subregions without priority are taken as @priority 0.
 616  * A region may only be added once as a subregion (unless removed with
 617  * memory_region_del_subregion()); use memory_region_init_alias() if you
 618  * want a region to be a subregion in multiple locations.
 619  *
 620  * @mr: the region to contain the new subregion; must be a container
 621  *      initialized with memory_region_init().
 622  * @offset: the offset relative to @mr where @subregion is added.
 623  * @subregion: the subregion to be added.
 624  * @priority: used for resolving overlaps; highest priority wins.
 625  */
 626 void memory_region_add_subregion_overlap(MemoryRegion *mr,
 627                                          target_phys_addr_t offset,
 628                                          MemoryRegion *subregion,
 629                                          unsigned priority);
 630
 631 /**
 632  * memory_region_get_ram_addr: Get the ram address associated with a memory
 633  *                             region
 634  *
 635  * DO NOT USE THIS FUNCTION.  This is a temporary workaround while the Xen
 636  * code is being reworked.
 637  */
 638 ram_addr_t memory_region_get_ram_addr(MemoryRegion *mr);
 639
 640 /**
 641  * memory_region_del_subregion: Remove a subregion.
 642  *
 643  * Removes a subregion from its container.
 644  *
 645  * @mr: the container to be updated.
 646  * @subregion: the region being removed; must be a current subregion of @mr.
 647  */
 648 void memory_region_del_subregion(MemoryRegion *mr,
 649                                  MemoryRegion *subregion);
 650
 651 /*
 652  * memory_region_set_enabled: dynamically enable or disable a region
 653  *
 654  * Enables or disables a memory region.  A disabled memory region
 655  * ignores all accesses to itself and its subregions.  It does not
 656  * obscure sibling subregions with lower priority - it simply behaves as
 657  * if it was removed from the hierarchy.
 658  *
 659  * Regions default to being enabled.
 660  *
 661  * @mr: the region to be updated
 662  * @enabled: whether to enable or disable the region
 663  */
 664 void memory_region_set_enabled(MemoryRegion *mr, bool enabled);
 665
 666 /*
 667  * memory_region_set_address: dynamically update the address of a region
 668  *
 669  * Dynamically updates the address of a region, relative to its parent.
 670  * May be used on regions are currently part of a memory hierarchy.
 671  *
 672  * @mr: the region to be updated
 673  * @addr: new address, relative to parent region
 674  */
 675 void memory_region_set_address(MemoryRegion *mr, target_phys_addr_t addr);
 676
 677 /*
 678  * memory_region_set_alias_offset: dynamically update a memory alias's offset
 679  *
 680  * Dynamically updates the offset into the target region that an alias points
 681  * to, as if the fourth argument to memory_region_init_alias() has changed.
 682  *
 683  * @mr: the #MemoryRegion to be updated; should be an alias.
 684  * @offset: the new offset into the target memory region
 685  */
 686 void memory_region_set_alias_offset(MemoryRegion *mr,
 687                                     target_phys_addr_t offset);
 688
 689 /**
 690  * memory_region_find: locate a MemoryRegion in an address space
 691  *
 692  * Locates the first #MemoryRegion within an address space given by
 693  * @address_space that overlaps the range given by @addr and @size.
 694  *
 695  * Returns a #MemoryRegionSection that describes a contiguous overlap.
 696  * It will have the following characteristics:
 697  *    .@offset_within_address_space >= @addr
 698  *    .@offset_within_address_space + .@size <= @addr + @size
 699  *    .@size = 0 iff no overlap was found
 700  *    .@mr is non-%NULL iff an overlap was found
 701  *
 702  * @address_space: a top-level (i.e. parentless) region that contains
 703  *       the region to be found
 704  * @addr: start of the area within @address_space to be searched
 705  * @size: size of the area to be searched
 706  */
 707 MemoryRegionSection memory_region_find(MemoryRegion *address_space,
 708                                        target_phys_addr_t addr, uint64_t size);
 709
 710 /**
 711  * memory_region_section_addr: get offset within MemoryRegionSection
 712  *
 713  * Returns offset within MemoryRegionSection
 714  *
 715  * @section: the memory region section being queried
 716  * @addr: address in address space
 717  */
 718 static inline target_phys_addr_t
 719 memory_region_section_addr(MemoryRegionSection *section,
 720                            target_phys_addr_t addr)
 721 {
 722     addr -= section->offset_within_address_space;
 723     addr += section->offset_within_region;
 724     return addr;
 725 }
 726
 727 /**
 728  * memory_global_sync_dirty_bitmap: synchronize the dirty log for all memory
 729  *
 730  * Synchronizes the dirty page log for an entire address space.
 731  * @address_space: a top-level (i.e. parentless) region that contains the
 732  *       memory being synchronized
 733  */
 734 void memory_global_sync_dirty_bitmap(MemoryRegion *address_space);
 735
 736 /**
 737  * memory_region_transaction_begin: Start a transaction.
 738  *
 739  * During a transaction, changes will be accumulated and made visible
 740  * only when the transaction ends (is committed).
 741  */
 742 void memory_region_transaction_begin(void);
 743
 744 /**
 745  * memory_region_transaction_commit: Commit a transaction and make changes
 746  *                                   visible to the guest.
 747  */
 748 void memory_region_transaction_commit(void);
 749
 750 /**
 751  * memory_listener_register: register callbacks to be called when memory
 752  *                           sections are mapped or unmapped into an address
 753  *                           space
 754  *
 755  * @listener: an object containing the callbacks to be called
 756  * @filter: if non-%NULL, only regions in this address space will be observed
 757  */
 758 void memory_listener_register(MemoryListener *listener, MemoryRegion *filter);
 759
 760 /**
 761  * memory_listener_unregister: undo the effect of memory_listener_register()
 762  *
 763  * @listener: an object containing the callbacks to be removed
 764  */
 765 void memory_listener_unregister(MemoryListener *listener);
 766
 767 /**
 768  * memory_global_dirty_log_start: begin dirty logging for all regions
 769  */
 770 void memory_global_dirty_log_start(void);
 771
 772 /**
 773  * memory_global_dirty_log_stop: end dirty logging for all regions
 774  */
 775 void memory_global_dirty_log_stop(void);
 776
 777 void mtree_info(fprintf_function mon_printf, void *f);
 778
 779 #endif
 780
 781 #endif