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memory: add API for creating ROM/device regions

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ROM/device regions act as mapped RAM for reads, can I/O memory for
writes.  This allow emulation of flash devices.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Avi Kivity 2011-08-08 19:58:49 +03:00 • committed by Anthony Liguori
parent 545e92e06a
commit d0a9b5bc0a
2 changed files with 78 additions and 2 deletions
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34
memory.h
View file

@ -113,6 +113,7 @@ struct MemoryRegion {
ram_addr_t ram_addr;
IORange iorange;
bool terminates;
bool readable;
MemoryRegion *alias;
target_phys_addr_t alias_offset;
unsigned priority;
@ -219,6 +220,25 @@ void memory_region_init_alias(MemoryRegion *mr,
MemoryRegion *orig,
target_phys_addr_t 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.
* @dev: a device associated with the region; may be %NULL.
* @name: the name of the region; the pair (@dev, @name) must be globally
* unique. The name is part of the save/restore ABI and so cannot be
* changed.
* @size: size of the region.
*/
void memory_region_init_rom_device(MemoryRegion *mr,
const MemoryRegionOps *ops,
DeviceState *dev, /* FIXME: layering violation */
const char *name,
uint64_t size);
/**
* memory_region_destroy: Destroy a memory region and relaim all resources.
*
@ -330,6 +350,20 @@ void memory_region_reset_dirty(MemoryRegion *mr, target_phys_addr_t addr,
*/
void memory_region_set_readonly(MemoryRegion *mr, bool readonly);
/**
* memory_region_rom_device_set_readable: enable/disable ROM readability
*
* Allows a ROM device (initialized with memory_region_init_rom_device() to
* to be marked as readable (default) or not readable. When it is readable,
* the device is mapped to guest memory. When not readable, reads are
* forwarded to the #MemoryRegion.read function.
*
* @mr: the memory region to be updated
* @readable: whether reads are satisified directly (%true) or via callbacks
* (%false)
*/
void memory_region_rom_device_set_readable(MemoryRegion *mr, bool readable);
/**
* memory_region_set_coalescing: Enable memory coalescing for the region.
*