Archipelago » qemu

/*

 * Physical memory management API

 *

 * Copyright 2011 Red Hat, Inc. and/or its affiliates

 *

 * Authors:

 *  Avi Kivity <avi@redhat.com>

 *

 * This work is licensed under the terms of the GNU GPL, version 2.  See

 * the COPYING file in the top-level directory.

 *

 */

#ifndef MEMORY_H

#define MEMORY_H

#ifndef CONFIG_USER_ONLY

#include <stdint.h>

#include <stdbool.h>

#include "qemu-common.h"

#include "exec/cpu-common.h"

#include "exec/hwaddr.h"

#include "qemu/queue.h"

#include "exec/iorange.h"

#include "exec/ioport.h"

#include "qemu/int128.h"

#define MAX_PHYS_ADDR_SPACE_BITS 62

#define MAX_PHYS_ADDR            (((hwaddr)1 << MAX_PHYS_ADDR_SPACE_BITS) - 1)

typedef struct MemoryRegionOps MemoryRegionOps;

typedef struct MemoryRegionPortio MemoryRegionPortio;

typedef struct MemoryRegionMmio MemoryRegionMmio;

/* Must match *_DIRTY_FLAGS in cpu-all.h.  To be replaced with dynamic

 * registration.

 */

#define DIRTY_MEMORY_VGA       0

#define DIRTY_MEMORY_CODE      1

#define DIRTY_MEMORY_MIGRATION 3

struct MemoryRegionMmio {

    CPUReadMemoryFunc *read[3];

    CPUWriteMemoryFunc *write[3];

};

/* Internal use; thunks between old-style IORange and MemoryRegions. */

typedef struct MemoryRegionIORange MemoryRegionIORange;

struct MemoryRegionIORange {

    IORange iorange;

    MemoryRegion *mr;

    hwaddr offset;

};

/*

 * Memory region callbacks

 */

struct MemoryRegionOps {

    /* Read from the memory region. @addr is relative to @mr; @size is

     * in bytes. */

    uint64_t (*read)(void *opaque,

                     hwaddr addr,

                     unsigned size);

    /* Write to the memory region. @addr is relative to @mr; @size is

     * in bytes. */

    void (*write)(void *opaque,

                  hwaddr addr,

                  uint64_t data,

                  unsigned size);

    enum device_endian endianness;

    /* Guest-visible constraints: */

    struct {

        /* If nonzero, specify bounds on access sizes beyond which a machine

         * check is thrown.

         */

        unsigned min_access_size;

        unsigned max_access_size;

        /* If true, unaligned accesses are supported.  Otherwise unaligned

         * accesses throw machine checks.

         */

         bool unaligned;

        /*

         * If present, and returns #false, the transaction is not accepted

         * by the device (and results in machine dependent behaviour such

         * as a machine check exception).

         */

        bool (*accepts)(void *opaque, hwaddr addr,

                        unsigned size, bool is_write);

    } valid;

    /* Internal implementation constraints: */

    struct {

        /* If nonzero, specifies the minimum size implemented.  Smaller sizes

         * will be rounded upwards and a partial result will be returned.

         */

        unsigned min_access_size;

        /* If nonzero, specifies the maximum size implemented.  Larger sizes

         * will be done as a series of accesses with smaller sizes.

         */

        unsigned max_access_size;

        /* If true, unaligned accesses are supported.  Otherwise all accesses

         * are converted to (possibly multiple) naturally aligned accesses.

         */

         bool unaligned;

    } impl;

    /* If .read and .write are not present, old_portio may be used for

     * backwards compatibility with old portio registration

     */

    const MemoryRegionPortio *old_portio;

    /* If .read and .write are not present, old_mmio may be used for

     * backwards compatibility with old mmio registration

     */

    const MemoryRegionMmio old_mmio;

};

typedef struct CoalescedMemoryRange CoalescedMemoryRange;

typedef struct MemoryRegionIoeventfd MemoryRegionIoeventfd;

struct MemoryRegion {

    /* All fields are private - violators will be prosecuted */

    const MemoryRegionOps *ops;

    void *opaque;

    MemoryRegion *parent;

    Int128 size;

    hwaddr addr;

    void (*destructor)(MemoryRegion *mr);

    ram_addr_t ram_addr;

    bool subpage;

    bool terminates;

    bool romd_mode;

    bool ram;

    bool readonly; /* For RAM regions */

    bool enabled;

    bool rom_device;

    bool warning_printed; /* For reservations */

    bool flush_coalesced_mmio;

    MemoryRegion *alias;

    hwaddr alias_offset;

    unsigned priority;

    bool may_overlap;

    QTAILQ_HEAD(subregions, MemoryRegion) subregions;

    QTAILQ_ENTRY(MemoryRegion) subregions_link;

    QTAILQ_HEAD(coalesced_ranges, CoalescedMemoryRange) coalesced;

    const char *name;

    uint8_t dirty_log_mask;

    unsigned ioeventfd_nb;

    MemoryRegionIoeventfd *ioeventfds;

};

struct MemoryRegionPortio {

    uint32_t offset;

    uint32_t len;

    unsigned size;

    IOPortReadFunc *read;

    IOPortWriteFunc *write;

};

#define PORTIO_END_OF_LIST() { }

/**

 * AddressSpace: describes a mapping of addresses to #MemoryRegion objects

 */

struct AddressSpace {

    /* All fields are private. */

    const char *name;

    MemoryRegion *root;

    struct FlatView *current_map;

    int ioeventfd_nb;

    struct MemoryRegionIoeventfd *ioeventfds;

    struct AddressSpaceDispatch *dispatch;

    QTAILQ_ENTRY(AddressSpace) address_spaces_link;

};

/**

 * MemoryRegionSection: describes a fragment of a #MemoryRegion

 *

 * @mr: the region, or %NULL if empty

 * @address_space: the address space the region is mapped in

 * @offset_within_region: the beginning of the section, relative to @mr's start

 * @size: the size of the section; will not exceed @mr's boundaries

 * @offset_within_address_space: the address of the first byte of the section

 *     relative to the region's address space

 * @readonly: writes to this section are ignored

 */

struct MemoryRegionSection {

    MemoryRegion *mr;

    AddressSpace *address_space;

    hwaddr offset_within_region;

    uint64_t size;

    hwaddr offset_within_address_space;

    bool readonly;

};

typedef struct MemoryListener MemoryListener;

/**

 * MemoryListener: callbacks structure for updates to the physical memory map

 *

 * Allows a component to adjust to changes in the guest-visible memory map.

 * Use with memory_listener_register() and memory_listener_unregister().

 */

struct MemoryListener {

    void (*begin)(MemoryListener *listener);

    void (*commit)(MemoryListener *listener);

    void (*region_add)(MemoryListener *listener, MemoryRegionSection *section);

    void (*region_del)(MemoryListener *listener, MemoryRegionSection *section);

    void (*region_nop)(MemoryListener *listener, MemoryRegionSection *section);

    void (*log_start)(MemoryListener *listener, MemoryRegionSection *section);

    void (*log_stop)(MemoryListener *listener, MemoryRegionSection *section);

    void (*log_sync)(MemoryListener *listener, MemoryRegionSection *section);

    void (*log_global_start)(MemoryListener *listener);

    void (*log_global_stop)(MemoryListener *listener);

    void (*eventfd_add)(MemoryListener *listener, MemoryRegionSection *section,

                        bool match_data, uint64_t data, EventNotifier *e);

    void (*eventfd_del)(MemoryListener *listener, MemoryRegionSection *section,

                        bool match_data, uint64_t data, EventNotifier *e);

    void (*coalesced_mmio_add)(MemoryListener *listener, MemoryRegionSection *section,

                               hwaddr addr, hwaddr len);

    void (*coalesced_mmio_del)(MemoryListener *listener, MemoryRegionSection *section,

                               hwaddr addr, hwaddr len);

    /* Lower = earlier (during add), later (during del) */

    unsigned priority;

    AddressSpace *address_space_filter;

    QTAILQ_ENTRY(MemoryListener) link;

};

/**

 * memory_region_init: Initialize a memory region

 *

 * The region typically acts as a container for other memory regions.  Use

 * memory_region_add_subregion() to add subregions.

 *

 * @mr: the #MemoryRegion to be initialized

 * @name: used for debugging; not visible to the user or ABI

 * @size: size of the region; any subregions beyond this size will be clipped

 */

void memory_region_init(MemoryRegion *mr,

                        const char *name,

                        uint64_t size);

/**

 * memory_region_init_io: Initialize an I/O memory region.

 *

 * Accesses into the region will cause the callbacks in @ops to be called.

 * if @size is nonzero, subregions will be clipped to @size.

 *

 * @mr: the #MemoryRegion to be initialized.

 * @ops: a structure containing read and write callbacks to be used when

 *       I/O is performed on the region.

 * @opaque: passed to to the read and write callbacks of the @ops structure.

 * @name: used for debugging; not visible to the user or ABI

 * @size: size of the region.

 */

void memory_region_init_io(MemoryRegion *mr,

                           const MemoryRegionOps *ops,

                           void *opaque,

                           const char *name,

                           uint64_t size);

/**

 * memory_region_init_ram:  Initialize RAM memory region.  Accesses into the

 *                          region will modify memory directly.

 *

 * @mr: the #MemoryRegion to be initialized.

 * @name: the name of the region.

 * @size: size of the region.

 */

void memory_region_init_ram(MemoryRegion *mr,

                            const char *name,

                            uint64_t size);

/**

 * memory_region_init_ram_ptr:  Initialize RAM memory region from a

 *                              user-provided pointer.  Accesses into the

 *                              region will modify memory directly.

 *

 * @mr: the #MemoryRegion to be initialized.

 * @name: the name of the region.

 * @size: size of the region.

 * @ptr: memory to be mapped; must contain at least @size bytes.

 */

void memory_region_init_ram_ptr(MemoryRegion *mr,

                                const char *name,

                                uint64_t size,

                                void *ptr);

/**

 * memory_region_init_alias: Initialize a memory region that aliases all or a

 *                           part of another memory region.

 *

 * @mr: the #MemoryRegion to be initialized.

 * @name: used for debugging; not visible to the user or ABI

 * @orig: the region to be referenced; @mr will be equivalent to

 *        @orig between @offset and @offset + @size - 1.

 * @offset: start of the section in @orig to be referenced.

 * @size: size of the region.

 */

void memory_region_init_alias(MemoryRegion *mr,

                              const char *name,

                              MemoryRegion *orig,

                              hwaddr offset,

                              uint64_t size);

/**

 * memory_region_init_rom_device:  Initialize a ROM memory region.  Writes are

 *                                 handled via callbacks.

 *

 * @mr: the #MemoryRegion to be initialized.

 * @ops: callbacks for write access handling.

 * @name: the name of the region.

 * @size: size of the region.

 */

void memory_region_init_rom_device(MemoryRegion *mr,

                                   const MemoryRegionOps *ops,

                                   void *opaque,

                                   const char *name,

                                   uint64_t size);

/**

 * memory_region_init_reservation: Initialize a memory region that reserves

 *                                 I/O space.

 *

 * A reservation region primariy serves debugging purposes.  It claims I/O

 * space that is not supposed to be handled by QEMU itself.  Any access via

 * the memory API will cause an abort().

 *

 * @mr: the #MemoryRegion to be initialized

 * @name: used for debugging; not visible to the user or ABI

 * @size: size of the region.

 */

void memory_region_init_reservation(MemoryRegion *mr,

                                    const char *name,

                                    uint64_t size);

/**

 * memory_region_destroy: Destroy a memory region and reclaim all resources.

 *

 * @mr: the region to be destroyed.  May not currently be a subregion

 *      (see memory_region_add_subregion()) or referenced in an alias

 *      (see memory_region_init_alias()).

 */

void memory_region_destroy(MemoryRegion *mr);

/**

 * memory_region_size: get a memory region's size.

 *

 * @mr: the memory region being queried.

 */

uint64_t memory_region_size(MemoryRegion *mr);

/**

 * memory_region_is_ram: check whether a memory region is random access

 *

 * Returns %true is a memory region is random access.

 *

 * @mr: the memory region being queried

 */

bool memory_region_is_ram(MemoryRegion *mr);

/**

 * memory_region_is_romd: check whether a memory region is in ROMD mode

 *

 * Returns %true if a memory region is a ROM device and currently set to allow

 * direct reads.

 *

 * @mr: the memory region being queried

 */

static inline bool memory_region_is_romd(MemoryRegion *mr)

{

    return mr->rom_device && mr->romd_mode;

}

/**

 * memory_region_name: get a memory region's name

 *

 * Returns the string that was used to initialize the memory region.

 *

 * @mr: the memory region being queried

 */

const char *memory_region_name(MemoryRegion *mr);

/**

 * memory_region_is_logging: return whether a memory region is logging writes

 *

 * Returns %true if the memory region is logging writes

 *

 * @mr: the memory region being queried

 */

bool memory_region_is_logging(MemoryRegion *mr);

/**

 * memory_region_is_rom: check whether a memory region is ROM

 *

 * Returns %true is a memory region is read-only memory.

 *

 * @mr: the memory region being queried

 */

bool memory_region_is_rom(MemoryRegion *mr);

/**

 * memory_region_get_ram_ptr: Get a pointer into a RAM memory region.

 *

 * Returns a host pointer to a RAM memory region (created with

 * memory_region_init_ram() or memory_region_init_ram_ptr()).  Use with

 * care.

 *

 * @mr: the memory region being queried.

 */

void *memory_region_get_ram_ptr(MemoryRegion *mr);

/**

 * memory_region_set_log: Turn dirty logging on or off for a region.

 *

 * Turns dirty logging on or off for a specified client (display, migration).

 * Only meaningful for RAM regions.

 *

 * @mr: the memory region being updated.

 * @log: whether dirty logging is to be enabled or disabled.

 * @client: the user of the logging information; %DIRTY_MEMORY_MIGRATION or

 *          %DIRTY_MEMORY_VGA.

 */

void memory_region_set_log(MemoryRegion *mr, bool log, unsigned client);

/**

 * memory_region_get_dirty: Check whether a range of bytes is dirty

 *                          for a specified client.

 *

 * Checks whether a range of bytes has been written to since the last

 * call to memory_region_reset_dirty() with the same @client.  Dirty logging

 * must be enabled.

 *

 * @mr: the memory region being queried.

 * @addr: the address (relative to the start of the region) being queried.

 * @size: the size of the range being queried.

 * @client: the user of the logging information; %DIRTY_MEMORY_MIGRATION or

 *          %DIRTY_MEMORY_VGA.

 */

bool memory_region_get_dirty(MemoryRegion *mr, hwaddr addr,

                             hwaddr size, unsigned client);

/**

 * memory_region_set_dirty: Mark a range of bytes as dirty in a memory region.

 *

 * Marks a range of bytes as dirty, after it has been dirtied outside

 * guest code.

 *

 * @mr: the memory region being dirtied.

 * @addr: the address (relative to the start of the region) being dirtied.

 * @size: size of the range being dirtied.

 */

void memory_region_set_dirty(MemoryRegion *mr, hwaddr addr,

                             hwaddr size);

/**

 * memory_region_test_and_clear_dirty: Check whether a range of bytes is dirty

 *                                     for a specified client. It clears them.

 *

 * Checks whether a range of bytes has been written to since the last

 * call to memory_region_reset_dirty() with the same @client.  Dirty logging

 * must be enabled.

 *

 * @mr: the memory region being queried.

 * @addr: the address (relative to the start of the region) being queried.

 * @size: the size of the range being queried.

 * @client: the user of the logging information; %DIRTY_MEMORY_MIGRATION or

 *          %DIRTY_MEMORY_VGA.

 */

bool memory_region_test_and_clear_dirty(MemoryRegion *mr, hwaddr addr,

                                        hwaddr size, unsigned client);

/**

 * memory_region_sync_dirty_bitmap: Synchronize a region's dirty bitmap with

 *                                  any external TLBs (e.g. kvm)

 *

 * Flushes dirty information from accelerators such as kvm and vhost-net

 * and makes it available to users of the memory API.

 *

 * @mr: the region being flushed.

 */

void memory_region_sync_dirty_bitmap(MemoryRegion *mr);

/**

 * memory_region_reset_dirty: Mark a range of pages as clean, for a specified

 *                            client.

 *

 * Marks a range of pages as no longer dirty.

 *

 * @mr: the region being updated.

 * @addr: the start of the subrange being cleaned.

 * @size: the size of the subrange being cleaned.

 * @client: the user of the logging information; %DIRTY_MEMORY_MIGRATION or

 *          %DIRTY_MEMORY_VGA.

 */

void memory_region_reset_dirty(MemoryRegion *mr, hwaddr addr,

                               hwaddr size, unsigned client);

/**

 * memory_region_set_readonly: Turn a memory region read-only (or read-write)

 *

 * Allows a memory region to be marked as read-only (turning it into a ROM).

 * only useful on RAM regions.

 *

 * @mr: the region being updated.

 * @readonly: whether rhe region is to be ROM or RAM.

 */

void memory_region_set_readonly(MemoryRegion *mr, bool readonly);

/**

 * memory_region_rom_device_set_romd: enable/disable ROMD mode

 *

 * Allows a ROM device (initialized with memory_region_init_rom_device() to

 * set to ROMD mode (default) or MMIO mode.  When it is in ROMD mode, the

 * device is mapped to guest memory and satisfies read access directly.

 * When in MMIO mode, reads are forwarded to the #MemoryRegion.read function.

 * Writes are always handled by the #MemoryRegion.write function.

 *

 * @mr: the memory region to be updated

 * @romd_mode: %true to put the region into ROMD mode

 */

void memory_region_rom_device_set_romd(MemoryRegion *mr, bool romd_mode);

/**

 * memory_region_set_coalescing: Enable memory coalescing for the region.

 *

 * Enabled writes to a region to be queued for later processing. MMIO ->write

 * callbacks may be delayed until a non-coalesced MMIO is issued.

 * Only useful for IO regions.  Roughly similar to write-combining hardware.

 *

 * @mr: the memory region to be write coalesced

 */

void memory_region_set_coalescing(MemoryRegion *mr);

/**

 * memory_region_add_coalescing: Enable memory coalescing for a sub-range of

 *                               a region.

 *

 * Like memory_region_set_coalescing(), but works on a sub-range of a region.

 * Multiple calls can be issued coalesced disjoint ranges.

 *

 * @mr: the memory region to be updated.

 * @offset: the start of the range within the region to be coalesced.

 * @size: the size of the subrange to be coalesced.

 */

void memory_region_add_coalescing(MemoryRegion *mr,

                                  hwaddr offset,

                                  uint64_t size);

/**

 * memory_region_clear_coalescing: Disable MMIO coalescing for the region.

 *

 * Disables any coalescing caused by memory_region_set_coalescing() or

 * memory_region_add_coalescing().  Roughly equivalent to uncacheble memory

 * hardware.

 *

 * @mr: the memory region to be updated.

 */

void memory_region_clear_coalescing(MemoryRegion *mr);

/**

 * memory_region_set_flush_coalesced: Enforce memory coalescing flush before

 *                                    accesses.

 *

 * Ensure that pending coalesced MMIO request are flushed before the memory

 * region is accessed. This property is automatically enabled for all regions

 * passed to memory_region_set_coalescing() and memory_region_add_coalescing().

 *

 * @mr: the memory region to be updated.

 */

void memory_region_set_flush_coalesced(MemoryRegion *mr);

/**

 * memory_region_clear_flush_coalesced: Disable memory coalescing flush before

 *                                      accesses.

 *

 * Clear the automatic coalesced MMIO flushing enabled via

 * memory_region_set_flush_coalesced. Note that this service has no effect on

 * memory regions that have MMIO coalescing enabled for themselves. For them,

 * automatic flushing will stop once coalescing is disabled.

 *

 * @mr: the memory region to be updated.

 */

void memory_region_clear_flush_coalesced(MemoryRegion *mr);

/**

 * memory_region_add_eventfd: Request an eventfd to be triggered when a word

 *                            is written to a location.

 *

 * Marks a word in an IO region (initialized with memory_region_init_io())

 * as a trigger for an eventfd event.  The I/O callback will not be called.

 * The caller must be prepared to handle failure (that is, take the required

 * action if the callback _is_ called).

 *

 * @mr: the memory region being updated.

 * @addr: the address within @mr that is to be monitored

 * @size: the size of the access to trigger the eventfd

 * @match_data: whether to match against @data, instead of just @addr

 * @data: the data to match against the guest write

 * @fd: the eventfd to be triggered when @addr, @size, and @data all match.

 **/

void memory_region_add_eventfd(MemoryRegion *mr,

                               hwaddr addr,

                               unsigned size,

                               bool match_data,

                               uint64_t data,

                               EventNotifier *e);

/**

 * memory_region_del_eventfd: Cancel an eventfd.

 *

 * Cancels an eventfd trigger requested by a previous

 * memory_region_add_eventfd() call.

 *

 * @mr: the memory region being updated.

 * @addr: the address within @mr that is to be monitored

 * @size: the size of the access to trigger the eventfd

 * @match_data: whether to match against @data, instead of just @addr

 * @data: the data to match against the guest write

 * @fd: the eventfd to be triggered when @addr, @size, and @data all match.

 */

void memory_region_del_eventfd(MemoryRegion *mr,

                               hwaddr addr,

                               unsigned size,

                               bool match_data,

                               uint64_t data,

                               EventNotifier *e);

/**

 * memory_region_add_subregion: Add a subregion to a container.

 *

 * Adds a subregion at @offset.  The subregion may not overlap with other

 * subregions (except for those explicitly marked as overlapping).  A region

 * may only be added once as a subregion (unless removed with

 * memory_region_del_subregion()); use memory_region_init_alias() if you

 * want a region to be a subregion in multiple locations.

 *

 * @mr: the region to contain the new subregion; must be a container

 *      initialized with memory_region_init().

 * @offset: the offset relative to @mr where @subregion is added.

 * @subregion: the subregion to be added.

 */

void memory_region_add_subregion(MemoryRegion *mr,

                                 hwaddr offset,

                                 MemoryRegion *subregion);

/**

 * memory_region_add_subregion_overlap: Add a subregion to a container

 *                                      with overlap.

 *

 * Adds a subregion at @offset.  The subregion may overlap with other

 * subregions.  Conflicts are resolved by having a higher @priority hide a

 * lower @priority. Subregions without priority are taken as @priority 0.

 * A region may only be added once as a subregion (unless removed with

 * memory_region_del_subregion()); use memory_region_init_alias() if you

 * want a region to be a subregion in multiple locations.

 *

 * @mr: the region to contain the new subregion; must be a container

 *      initialized with memory_region_init().

 * @offset: the offset relative to @mr where @subregion is added.

 * @subregion: the subregion to be added.

 * @priority: used for resolving overlaps; highest priority wins.

 */

void memory_region_add_subregion_overlap(MemoryRegion *mr,

                                         hwaddr offset,

                                         MemoryRegion *subregion,

                                         unsigned priority);

/**

 * memory_region_get_ram_addr: Get the ram address associated with a memory

 *                             region

 *

 * DO NOT USE THIS FUNCTION.  This is a temporary workaround while the Xen

 * code is being reworked.

 */

ram_addr_t memory_region_get_ram_addr(MemoryRegion *mr);

/**

 * memory_region_del_subregion: Remove a subregion.

 *

 * Removes a subregion from its container.

 *

 * @mr: the container to be updated.

 * @subregion: the region being removed; must be a current subregion of @mr.

 */

void memory_region_del_subregion(MemoryRegion *mr,

                                 MemoryRegion *subregion);

/*

 * memory_region_set_enabled: dynamically enable or disable a region

 *

 * Enables or disables a memory region.  A disabled memory region

 * ignores all accesses to itself and its subregions.  It does not

 * obscure sibling subregions with lower priority - it simply behaves as

 * if it was removed from the hierarchy.

 *

 * Regions default to being enabled.

 *

 * @mr: the region to be updated

 * @enabled: whether to enable or disable the region

 */

void memory_region_set_enabled(MemoryRegion *mr, bool enabled);

/*

 * memory_region_set_address: dynamically update the address of a region

 *

 * Dynamically updates the address of a region, relative to its parent.

 * May be used on regions are currently part of a memory hierarchy.

 *

 * @mr: the region to be updated

 * @addr: new address, relative to parent region

 */

void memory_region_set_address(MemoryRegion *mr, hwaddr addr);

/*

 * memory_region_set_alias_offset: dynamically update a memory alias's offset

 *

 * Dynamically updates the offset into the target region that an alias points

 * to, as if the fourth argument to memory_region_init_alias() has changed.

 *

 * @mr: the #MemoryRegion to be updated; should be an alias.

 * @offset: the new offset into the target memory region

 */

void memory_region_set_alias_offset(MemoryRegion *mr,

                                    hwaddr offset);

/**

 * memory_region_find: translate an address/size relative to a

 * MemoryRegion into a #MemoryRegionSection.

 *

 * Locates the first #MemoryRegion within @mr that overlaps the range

 * given by @addr and @size.

 *

 * Returns a #MemoryRegionSection that describes a contiguous overlap.

 * It will have the following characteristics:

 *    .@size = 0 iff no overlap was found

 *    .@mr is non-%NULL iff an overlap was found

 *

 * Remember that in the return value the @offset_within_region is

 * relative to the returned region (in the .@mr field), not to the

 * @mr argument.

 *

 * Similarly, the .@offset_within_address_space is relative to the

 * address space that contains both regions, the passed and the

 * returned one.  However, in the special case where the @mr argument

 * has no parent (and thus is the root of the address space), the

 * following will hold:

 *    .@offset_within_address_space >= @addr

 *    .@offset_within_address_space + .@size <= @addr + @size

 *

 * @mr: a MemoryRegion within which @addr is a relative address

 * @addr: start of the area within @as to be searched

 * @size: size of the area to be searched

 */

MemoryRegionSection memory_region_find(MemoryRegion *mr,

                                       hwaddr addr, uint64_t size);

/**

 * address_space_sync_dirty_bitmap: synchronize the dirty log for all memory

 *

 * Synchronizes the dirty page log for an entire address space.

 * @as: the address space that contains the memory being synchronized

 */

void address_space_sync_dirty_bitmap(AddressSpace *as);

/**

 * memory_region_transaction_begin: Start a transaction.

 *

 * During a transaction, changes will be accumulated and made visible

 * only when the transaction ends (is committed).

 */

void memory_region_transaction_begin(void);

/**

 * memory_region_transaction_commit: Commit a transaction and make changes

 *                                   visible to the guest.

 */

void memory_region_transaction_commit(void);

/**

 * memory_listener_register: register callbacks to be called when memory

 *                           sections are mapped or unmapped into an address

 *                           space

 *

 * @listener: an object containing the callbacks to be called

 * @filter: if non-%NULL, only regions in this address space will be observed

 */

void memory_listener_register(MemoryListener *listener, AddressSpace *filter);

/**

 * memory_listener_unregister: undo the effect of memory_listener_register()

 *

 * @listener: an object containing the callbacks to be removed

 */

void memory_listener_unregister(MemoryListener *listener);

/**

 * memory_global_dirty_log_start: begin dirty logging for all regions

 */

void memory_global_dirty_log_start(void);

/**

 * memory_global_dirty_log_stop: end dirty logging for all regions

 */

void memory_global_dirty_log_stop(void);

void mtree_info(fprintf_function mon_printf, void *f);

/**

 * address_space_init: initializes an address space

 *

 * @as: an uninitialized #AddressSpace

 * @root: a #MemoryRegion that routes addesses for the address space

 */

void address_space_init(AddressSpace *as, MemoryRegion *root);

/**

 * address_space_destroy: destroy an address space

 *

 * Releases all resources associated with an address space.  After an address space

 * is destroyed, its root memory region (given by address_space_init()) may be destroyed

 * as well.

 *

 * @as: address space to be destroyed

 */

void address_space_destroy(AddressSpace *as);

/**

 * address_space_rw: read from or write to an address space.

 *

 * @as: #AddressSpace to be accessed

 * @addr: address within that address space

 * @buf: buffer with the data transferred

 * @is_write: indicates the transfer direction

 */

void address_space_rw(AddressSpace *as, hwaddr addr, uint8_t *buf,

                      int len, bool is_write);

/**

 * address_space_write: write to address space.

 *

 * @as: #AddressSpace to be accessed

 * @addr: address within that address space

 * @buf: buffer with the data transferred

 */

void address_space_write(AddressSpace *as, hwaddr addr,

                         const uint8_t *buf, int len);

/**

 * address_space_read: read from an address space.

 *

 * @as: #AddressSpace to be accessed

 * @addr: address within that address space

 * @buf: buffer with the data transferred

 */

void address_space_read(AddressSpace *as, hwaddr addr, uint8_t *buf, int len);

/* address_space_translate: translate an address range into an address space

 * into a MemoryRegionSection and an address range into that section

 *

 * @as: #AddressSpace to be accessed

 * @addr: address within that address space

 * @xlat: pointer to address within the returned memory region section's

 * #MemoryRegion.

 * @len: pointer to length

 * @is_write: indicates the transfer direction

 */

MemoryRegionSection *address_space_translate(AddressSpace *as, hwaddr addr,

                                             hwaddr *xlat, hwaddr *len,

                                             bool is_write);

/* address_space_access_valid: check for validity of accessing an address

 * space range

 *

 * Check whether memory is assigned to the given address space range.

 *

 * For now, addr and len should be aligned to a page size.  This limitation

 * will be lifted in the future.

 *

 * @as: #AddressSpace to be accessed

 * @addr: address within that address space

 * @len: length of the area to be checked

 * @is_write: indicates the transfer direction

 */

bool address_space_access_valid(AddressSpace *as, hwaddr addr, int len, bool is_write);

/* address_space_map: map a physical memory region into a host virtual address

 *

 * May map a subset of the requested range, given by and returned in @plen.

 * May return %NULL if resources needed to perform the mapping are exhausted.

 * Use only for reads OR writes - not for read-modify-write operations.

 * Use cpu_register_map_client() to know when retrying the map operation is

 * likely to succeed.

 *

 * @as: #AddressSpace to be accessed

 * @addr: address within that address space

 * @plen: pointer to length of buffer; updated on return

 * @is_write: indicates the transfer direction

 */

void *address_space_map(AddressSpace *as, hwaddr addr,

                        hwaddr *plen, bool is_write);

/* address_space_unmap: Unmaps a memory region previously mapped by address_space_map()

 *

 * Will also mark the memory as dirty if @is_write == %true.  @access_len gives

 * the amount of memory that was actually read or written by the caller.

 *

 * @as: #AddressSpace used

 * @addr: address within that address space

 * @len: buffer length as returned by address_space_map()

 * @access_len: amount of data actually transferred

 * @is_write: indicates the transfer direction

 */

void address_space_unmap(AddressSpace *as, void *buffer, hwaddr len,

                         int is_write, hwaddr access_len);

#endif

#endif