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/*
* Memory Device Interface
*
* Copyright (c) 2018 Red Hat, Inc.
*
* Authors:
* David Hildenbrand <david@redhat.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#ifndef MEMORY_DEVICE_H
#define MEMORY_DEVICE_H
#include "qom/object.h"
#include "hw/qdev.h"
#define TYPE_MEMORY_DEVICE "memory-device"
#define MEMORY_DEVICE_CLASS(klass) \
OBJECT_CLASS_CHECK(MemoryDeviceClass, (klass), TYPE_MEMORY_DEVICE)
#define MEMORY_DEVICE_GET_CLASS(obj) \
OBJECT_GET_CLASS(MemoryDeviceClass, (obj), TYPE_MEMORY_DEVICE)
#define MEMORY_DEVICE(obj) \
INTERFACE_CHECK(MemoryDeviceState, (obj), TYPE_MEMORY_DEVICE)
typedef struct MemoryDeviceState {
Object parent_obj;
} MemoryDeviceState;
/**
* MemoryDeviceClass:
*
* All memory devices need to implement TYPE_MEMORY_DEVICE as an interface.
*
* A memory device is a device that owns a memory region which is
* mapped into guest physical address space at a certain address. The
* address in guest physical memory can either be specified explicitly
* or get assigned automatically.
*/
typedef struct MemoryDeviceClass {
/* private */
InterfaceClass parent_class;
/*
* Return the address of the memory device in guest physical memory.
*
* Called when (un)plugging a memory device or when iterating over
* all memory devices mapped into guest physical address space.
*
* If "0" is returned, no address has been specified by the user and
* no address has been assigned to this memory device yet.
*/
uint64_t (*get_addr)(const MemoryDeviceState *md);
/*
* Return the amount of memory provided by the memory device currently
* usable ("plugged") by the VM.
*
* Called when calculating the total amount of ram available to the
* VM (e.g. to report memory stats to the user).
*
* This is helpful for devices that dynamically manage the amount of
* memory accessible by the guest via the reserved memory region. For
* most devices, this corresponds to the size of the memory region.
*/
uint64_t (*get_plugged_size)(const MemoryDeviceState *md, Error **errp);
uint64_t (*get_region_size)(const MemoryDeviceState *md, Error **errp);
/*
* Translate the memory device into #MemoryDeviceInfo.
*/
void (*fill_device_info)(const MemoryDeviceState *md,
MemoryDeviceInfo *info);
} MemoryDeviceClass;
MemoryDeviceInfoList *qmp_memory_device_list(void);
uint64_t get_plugged_memory_size(void);
uint64_t memory_device_get_free_addr(MachineState *ms, const uint64_t *hint,
uint64_t align, uint64_t size,
Error **errp);
void memory_device_plug_region(MachineState *ms, MemoryRegion *mr,
uint64_t addr);
void memory_device_unplug_region(MachineState *ms, MemoryRegion *mr);
#endif
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