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author | 2015-08-28 09:58:54 +0800 | |
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committer | 2015-09-01 12:44:00 +0800 | |
commit | e44e3482bdb4d0ebde2d8b41830ac2cdb07948fb (patch) | |
tree | 66b09f592c55df2878107a468a91d21506104d3f /qemu/include/hw/stream.h | |
parent | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (diff) |
Add qemu 2.4.0
Change-Id: Ic99cbad4b61f8b127b7dc74d04576c0bcbaaf4f5
Signed-off-by: Yang Zhang <yang.z.zhang@intel.com>
Diffstat (limited to 'qemu/include/hw/stream.h')
-rw-r--r-- | qemu/include/hw/stream.h | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/qemu/include/hw/stream.h b/qemu/include/hw/stream.h new file mode 100644 index 000000000..30ccc5620 --- /dev/null +++ b/qemu/include/hw/stream.h @@ -0,0 +1,57 @@ +#ifndef STREAM_H +#define STREAM_H 1 + +#include "qemu-common.h" +#include "qom/object.h" + +/* stream slave. Used until qdev provides a generic way. */ +#define TYPE_STREAM_SLAVE "stream-slave" + +#define STREAM_SLAVE_CLASS(klass) \ + OBJECT_CLASS_CHECK(StreamSlaveClass, (klass), TYPE_STREAM_SLAVE) +#define STREAM_SLAVE_GET_CLASS(obj) \ + OBJECT_GET_CLASS(StreamSlaveClass, (obj), TYPE_STREAM_SLAVE) +#define STREAM_SLAVE(obj) \ + INTERFACE_CHECK(StreamSlave, (obj), TYPE_STREAM_SLAVE) + +typedef struct StreamSlave { + Object Parent; +} StreamSlave; + +typedef void (*StreamCanPushNotifyFn)(void *opaque); + +typedef struct StreamSlaveClass { + InterfaceClass parent; + /** + * can push - determine if a stream slave is capable of accepting at least + * one byte of data. Returns false if cannot accept. If not implemented, the + * slave is assumed to always be capable of receiving. + * @notify: Optional callback that the slave will call when the slave is + * capable of receiving again. Only called if false is returned. + * @notify_opaque: opaque data to pass to notify call. + */ + bool (*can_push)(StreamSlave *obj, StreamCanPushNotifyFn notify, + void *notify_opaque); + /** + * push - push data to a Stream slave. The number of bytes pushed is + * returned. If the slave short returns, the master must wait before trying + * again, the slave may continue to just return 0 waiting for the vm time to + * advance. The can_push() function can be used to trap the point in time + * where the slave is ready to receive again, otherwise polling on a QEMU + * timer will work. + * @obj: Stream slave to push to + * @buf: Data to write + * @len: Maximum number of bytes to write + */ + size_t (*push)(StreamSlave *obj, unsigned char *buf, size_t len); +} StreamSlaveClass; + +size_t +stream_push(StreamSlave *sink, uint8_t *buf, size_t len); + +bool +stream_can_push(StreamSlave *sink, StreamCanPushNotifyFn notify, + void *notify_opaque); + + +#endif /* STREAM_H */ |