Signal processing device and display apparatus for vehicles including the same
A signal processing device and a display apparatus for vehicles including the same are disclosed. The signal processing device includes a processor configured to process a signal for a display mounted in a vehicle, wherein the processor is configured to execute first to third virtual machines on a hypervisor in the processor, the second virtual machine is operated for a first display, the third virtual machine is operated for a second display, and the first virtual machine in the processor is configured to control a shared memory based on the hypervisor for transmission of identical data to the second virtual machine and the third virtual machine. Consequently, it is possible for a plurality of displays in the vehicle to display identical images in a synchronized state.
1 . A signal processing device comprising a processor configured to process a signal for a display mounted in a vehicle, wherein
the processor is configured to execute first to third virtual machines on a hypervisor in the processor,
the second virtual machine is operated for a first display,
the third virtual machine is operated for a second display, and
the first virtual machine in the processor is configured to control a shared memory based on the hypervisor for transmission of identical data to the second virtual machine and the third virtual machine,
the first virtual machine in the processor comprises an input and output server interface and a security manager,
each of the second virtual machine and the third virtual machine comprises an input and output client interface,
the input and output server interface is configured to receive information regarding a first buffer in the shared memory, the first buffer being empty, write first data in the first buffer in the shared memory, and transmit buffer information of the first buffer to the input and output client interfaces in the second virtual machine and the third virtual machine,
a reference count of the first buffer is changed in a first direction based on writing of the first data in the first buffer, and
in case in which copying of the first data to the first buffer is completed, the reference count of the first buffer is changed in a second direction, the second direction being opposite the first direction.
2 . The signal processing device of claim 1 , wherein the first virtual machine is configured to receive and process position information data variable due to movement, and transmit the processed data to the second virtual machine or the third virtual machine.
3 . The signal processing device of claim 1 , wherein the second virtual machine and the third virtual machine are operated by different operating systems.
4 . The signal processing device of claim 1 , wherein the first virtual machine in the processor is configured to transmit information regarding the shared memory comprising key data for data access to the second virtual machine and the third virtual machine after setting of the shared memory.
5 . The signal processing device of claim 1 , wherein
in order to transmit data from the input and output server interface in the first virtual machine to the input and output client interface,
the security manager is configured to allocate the shared memory, and
the input and output client interface is configured to transmit a request for connection to the input and output server interface after allocation of the shared memory.
6 . The signal processing device of claim 1 , wherein
the input and output server interface is configured to transmit information regarding the shared memory comprising key data for data access to the input and output client interface after allocation of the shared memory, and
the input and output client interface is configured to accesses the shared memory based on the key data.
7 . The signal processing device of claim 1 , wherein
the shared memory comprises a plurality of buffers,
the first virtual machine is configured to write first frame data to third frame data respectively in the first buffer to a third buffer, among the plurality of buffers, and
the input and output client interfaces in the second virtual machine and the third virtual machine sequentially copy the first frame data to the third frame data from the first buffer to the third buffer.
8 . The signal processing device of claim 7 , wherein, after copying of the first frame data from the first buffer by the input and output client interface in the third virtual machine is completed, the second virtual machine is configured to copy the second frame data from the second buffer.
9 . The signal processing device of claim 1 , wherein
the first virtual machine comprises a position information driver configured to process position information, a touch driver configured to process touch input, and a camera driver configured to process an image from a camera, and
the first virtual machine is configured to control the shared memory based on the hypervisor for each of the position information driver, the touch driver, and the camera driver.
10 . The signal processing device of claim 9 , wherein the input and output server interface configured to set a first shared memory for transmission of image data from the camera driver, and set a second shared memory for transmission of position information from the position information driver.
11 . The signal processing device of claim 7 , wherein
key data of the first shared memory and key data of the second shared memory are transmitted to the second virtual machine and the third virtual machine, and
the second virtual machine and the third virtual machine access the first shared memory and the second shared memory based on the key data of the first shared memory and the key data of the second shared memory.
12 . The signal processing device of claim 1 , further comprising:
a legacy virtual machine configured to receive and process Ethernet data, wherein
the first virtual machine is configured to receive, process, and output vehicle sensor data, position information data, camera image data, audio data, or touch input data.
13 . The signal processing device of claim 12 , wherein the first virtual machine is configured to write the vehicle sensor data, the position information data, the camera image data, or the touch input data in the shared memory, for sharing identical data in the second virtual machine and the third virtual machine.
14 . The signal processing device of claim 1 , wherein the first virtual machine is configured to receive and process wheel speed sensor data of the vehicle, and transmit the processed wheel speed sensor data to at least one of the second virtual machine and the third virtual machine.
15 . A display apparatus for vehicles, the display apparatus comprising:
a first display;
a second display; and
a signal processing device comprising a processor configured to process signals for the first display and the second display, wherein:
the processor is configured to execute first to third virtual machines on a hypervisor in the processor,
the second virtual machine is operated for the first display,
the third virtual machine is operated for the second display,
the first virtual machine in the processor is configured to control a shared memory based on the hypervisor for transmission of identical data to the second virtual machine and the third virtual machine,
the first virtual machine in the processor comprises an input and output server interface and a security manager,
each of the second virtual machine and the third virtual machine comprises an input and output client interface,
the input and output server interface is configured to receive information regarding a first buffer in the shared memory, the first buffer being empty, write first data in the first buffer in the shared memory, and transmit buffer information of the first buffer to the input and output client interfaces in the second virtual machine and the third virtual machine,
a reference count of the first buffer is changed in a first direction based on writing of the first data in the first buffer, and
in case in which copying of the first data to the first buffer is completed, the reference count of the first buffer is changed in a second direction, the second direction being opposite the first direction.
16 . The display apparatus of claim 15 , wherein the signal processing device is configured to transmit identical data to a plurality of virtual machines in a synchronized state, and display an identical image on a plurality of displays.