2 * Physical memory management API
4 * Copyright 2011 Red Hat, Inc. and/or its affiliates
9 * This work is licensed under the terms of the GNU GPL, version 2. See
10 * the COPYING file in the top-level directory.
17 #ifndef CONFIG_USER_ONLY
21 #include "qemu-common.h"
22 #include "cpu-common.h"
24 #include "qemu-queue.h"
26 typedef struct MemoryRegionOps MemoryRegionOps;
27 typedef struct MemoryRegion MemoryRegion;
29 /* Must match *_DIRTY_FLAGS in cpu-all.h. To be replaced with dynamic
32 #define DIRTY_MEMORY_VGA 0
33 #define DIRTY_MEMORY_CODE 1
34 #define DIRTY_MEMORY_MIGRATION 3
37 * Memory region callbacks
39 struct MemoryRegionOps {
40 /* Read from the memory region. @addr is relative to @mr; @size is
42 uint64_t (*read)(void *opaque,
43 target_phys_addr_t addr,
45 /* Write to the memory region. @addr is relative to @mr; @size is
47 void (*write)(void *opaque,
48 target_phys_addr_t addr,
52 enum device_endian endianness;
53 /* Guest-visible constraints: */
55 /* If nonzero, specify bounds on access sizes beyond which a machine
58 unsigned min_access_size;
59 unsigned max_access_size;
60 /* If true, unaligned accesses are supported. Otherwise unaligned
61 * accesses throw machine checks.
65 /* Internal implementation constraints: */
67 /* If nonzero, specifies the minimum size implemented. Smaller sizes
68 * will be rounded upwards and a partial result will be returned.
70 unsigned min_access_size;
71 /* If nonzero, specifies the maximum size implemented. Larger sizes
72 * will be done as a series of accesses with smaller sizes.
74 unsigned max_access_size;
75 /* If true, unaligned accesses are supported. Otherwise all accesses
76 * are converted to (possibly multiple) naturally aligned accesses.
82 typedef struct CoalescedMemoryRange CoalescedMemoryRange;
85 /* All fields are private - violators will be prosecuted */
86 const MemoryRegionOps *ops;
90 target_phys_addr_t addr;
91 target_phys_addr_t offset;
95 target_phys_addr_t alias_offset;
98 QTAILQ_HEAD(subregions, MemoryRegion) subregions;
99 QTAILQ_ENTRY(MemoryRegion) subregions_link;
100 QTAILQ_HEAD(coalesced_ranges, CoalescedMemoryRange) coalesced;
105 * memory_region_init: Initialize a memory region
107 * The region typically acts as a container for other memory regions. Us
108 * memory_region_add_subregion() to add subregions.
110 * @mr: the #MemoryRegion to be initialized
111 * @name: used for debugging; not visible to the user or ABI
112 * @size: size of the region; any subregions beyond this size will be clipped
114 void memory_region_init(MemoryRegion *mr,
118 * memory_region_init_io: Initialize an I/O memory region.
120 * Accesses into the region will be cause the callbacks in @ops to be called.
121 * if @size is nonzero, subregions will be clipped to @size.
123 * @mr: the #MemoryRegion to be initialized.
124 * @ops: a structure containing read and write callbacks to be used when
125 * I/O is performed on the region.
126 * @opaque: passed to to the read and write callbacks of the @ops structure.
127 * @name: used for debugging; not visible to the user or ABI
128 * @size: size of the region.
130 void memory_region_init_io(MemoryRegion *mr,
131 const MemoryRegionOps *ops,
137 * memory_region_init_ram: Initialize RAM memory region. Accesses into the
138 * region will be modify memory directly.
140 * @mr: the #MemoryRegion to be initialized.
141 * @dev: a device associated with the region; may be %NULL.
142 * @name: the name of the region; the pair (@dev, @name) must be globally
143 * unique. The name is part of the save/restore ABI and so cannot be
145 * @size: size of the region.
147 void memory_region_init_ram(MemoryRegion *mr,
148 DeviceState *dev, /* FIXME: layering violation */
153 * memory_region_init_ram: Initialize RAM memory region from a user-provided.
154 * pointer. Accesses into the region will be modify
157 * @mr: the #MemoryRegion to be initialized.
158 * @dev: a device associated with the region; may be %NULL.
159 * @name: the name of the region; the pair (@dev, @name) must be globally
160 * unique. The name is part of the save/restore ABI and so cannot be
162 * @size: size of the region.
163 * @ptr: memory to be mapped; must contain at least @size bytes.
165 void memory_region_init_ram_ptr(MemoryRegion *mr,
166 DeviceState *dev, /* FIXME: layering violation */
172 * memory_region_init_alias: Initialize a memory region that aliases all or a
173 * part of another memory region.
175 * @mr: the #MemoryRegion to be initialized.
176 * @name: used for debugging; not visible to the user or ABI
177 * @orig: the region to be referenced; @mr will be equivalent to
178 * @orig between @offset and @offset + @size - 1.
179 * @offset: start of the section in @orig to be referenced.
180 * @size: size of the region.
182 void memory_region_init_alias(MemoryRegion *mr,
185 target_phys_addr_t offset,
188 * memory_region_destroy: Destroy a memory region and relaim all resources.
190 * @mr: the region to be destroyed. May not currently be a subregion
191 * (see memory_region_add_subregion()) or referenced in an alias
192 * (see memory_region_init_alias()).
194 void memory_region_destroy(MemoryRegion *mr);
197 * memory_region_size: get a memory region's size.
199 * @mr: the memory region being queried.
201 uint64_t memory_region_size(MemoryRegion *mr);
204 * memory_region_get_ram_ptr: Get a pointer into a RAM memory region.
206 * Returns a host pointer to a RAM memory region (created with
207 * memory_region_init_ram() or memory_region_init_ram_ptr()). Use with
210 * @mr: the memory region being queried.
212 void *memory_region_get_ram_ptr(MemoryRegion *mr);
215 * memory_region_set_offset: Sets an offset to be added to MemoryRegionOps
218 * This function is deprecated and should not be used in new code.
220 void memory_region_set_offset(MemoryRegion *mr, target_phys_addr_t offset);
223 * memory_region_set_log: Turn dirty logging on or off for a region.
225 * Turns dirty logging on or off for a specified client (display, migration).
226 * Only meaningful for RAM regions.
228 * @mr: the memory region being updated.
229 * @log: whether dirty logging is to be enabled or disabled.
230 * @client: the user of the logging information; %DIRTY_MEMORY_MIGRATION or
233 void memory_region_set_log(MemoryRegion *mr, bool log, unsigned client);
236 * memory_region_get_dirty: Check whether a page is dirty for a specified
239 * Checks whether a page has been written to since the last
240 * call to memory_region_reset_dirty() with the same @client. Dirty logging
243 * @mr: the memory region being queried.
244 * @addr: the address (relative to the start of the region) being queried.
245 * @client: the user of the logging information; %DIRTY_MEMORY_MIGRATION or
248 bool memory_region_get_dirty(MemoryRegion *mr, target_phys_addr_t addr,
252 * memory_region_set_dirty: Mark a page as dirty in a memory region.
254 * Marks a page as dirty, after it has been dirtied outside guest code.
256 * @mr: the memory region being queried.
257 * @addr: the address (relative to the start of the region) being dirtied.
259 void memory_region_set_dirty(MemoryRegion *mr, target_phys_addr_t addr);
262 * memory_region_sync_dirty_bitmap: Synchronize a region's dirty bitmap with
263 * any external TLBs (e.g. kvm)
265 * Flushes dirty information from accelerators such as kvm and vhost-net
266 * and makes it available to users of the memory API.
268 * @mr: the region being flushed.
270 void memory_region_sync_dirty_bitmap(MemoryRegion *mr);
273 * memory_region_reset_dirty: Mark a range of pages as clean, for a specified
276 * Marks a range of pages as no longer dirty.
278 * @mr: the region being updated.
279 * @addr: the start of the subrange being cleaned.
280 * @size: the size of the subrange being cleaned.
281 * @client: the user of the logging information; %DIRTY_MEMORY_MIGRATION or
284 void memory_region_reset_dirty(MemoryRegion *mr, target_phys_addr_t addr,
285 target_phys_addr_t size, unsigned client);
288 * memory_region_set_readonly: Turn a memory region read-only (or read-write)
290 * Allows a memory region to be marked as read-only (turning it into a ROM).
291 * only useful on RAM regions.
293 * @mr: the region being updated.
294 * @readonly: whether rhe region is to be ROM or RAM.
296 void memory_region_set_readonly(MemoryRegion *mr, bool readonly);
299 * memory_region_set_coalescing: Enable memory coalescing for the region.
301 * Enabled writes to a region to be queued for later processing. MMIO ->write
302 * callbacks may be delayed until a non-coalesced MMIO is issued.
303 * Only useful for IO regions. Roughly similar to write-combining hardware.
305 * @mr: the memory region to be write coalesced
307 void memory_region_set_coalescing(MemoryRegion *mr);
310 * memory_region_add_coalescing: Enable memory coalescing for a sub-range of
313 * Like memory_region_set_coalescing(), but works on a sub-range of a region.
314 * Multiple calls can be issued coalesced disjoint ranges.
316 * @mr: the memory region to be updated.
317 * @offset: the start of the range within the region to be coalesced.
318 * @size: the size of the subrange to be coalesced.
320 void memory_region_add_coalescing(MemoryRegion *mr,
321 target_phys_addr_t offset,
325 * memory_region_clear_coalescing: Disable MMIO coalescing for the region.
327 * Disables any coalescing caused by memory_region_set_coalescing() or
328 * memory_region_add_coalescing(). Roughly equivalent to uncacheble memory
331 * @mr: the memory region to be updated.
333 void memory_region_clear_coalescing(MemoryRegion *mr);
336 * memory_region_add_subregion: Add a sub-region to a container.
338 * Adds a sub-region at @offset. The sub-region may not overlap with other
339 * subregions (except for those explicitly marked as overlapping). A region
340 * may only be added once as a subregion (unless removed with
341 * memory_region_del_subregion()); use memory_region_init_alias() if you
342 * want a region to be a subregion in multiple locations.
344 * @mr: the region to contain the new subregion; must be a container
345 * initialized with memory_region_init().
346 * @offset: the offset relative to @mr where @subregion is added.
347 * @subregion: the subregion to be added.
349 void memory_region_add_subregion(MemoryRegion *mr,
350 target_phys_addr_t offset,
351 MemoryRegion *subregion);
353 * memory_region_add_subregion: Add a sub-region to a container, with overlap.
355 * Adds a sub-region at @offset. The sub-region may overlap with other
356 * subregions. Conflicts are resolved by having a higher @priority hide a
357 * lower @priority. Subregions without priority are taken as @priority 0.
358 * A region may only be added once as a subregion (unless removed with
359 * memory_region_del_subregion()); use memory_region_init_alias() if you
360 * want a region to be a subregion in multiple locations.
362 * @mr: the region to contain the new subregion; must be a container
363 * initialized with memory_region_init().
364 * @offset: the offset relative to @mr where @subregion is added.
365 * @subregion: the subregion to be added.
366 * @priority: used for resolving overlaps; highest priority wins.
368 void memory_region_add_subregion_overlap(MemoryRegion *mr,
369 target_phys_addr_t offset,
370 MemoryRegion *subregion,
373 * memory_region_del_subregion: Remove a subregion.
375 * Removes a subregion from its container.
377 * @mr: the container to be updated.
378 * @subregion: the region being removed; must be a current subregion of @mr.
380 void memory_region_del_subregion(MemoryRegion *mr,
381 MemoryRegion *subregion);