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Abstract:We propose a hardware operating system kernel (HOSK), which schedules tasks, controls semaphores, and pre-fetches contexts, as a hardware coprocessor in multiprocessor systems. A multiprocessor system can substantially reduce multithreading overheads by using the HOSK together with simplified RISC processors that do not include hardware for multithreading. We implemented an efficient HOSK which requires about 14 ∼ 25 K gates. The experimental results show that the multithreading overheads with a HOSK can be reduced to less than 1 percent. Preliminary efforts confirm that this approach is a feasible solution for minimizing the hardware complexity of a multiprocessor system.

In this paper, a method to generate test bitstreams for verification of HEVC decoders is described, in which syntax elements (SEs) are classified into two classes: high-level and lowlevel. To enhance the coverage of high-level SEs, their values are selected by varying the structure of the bitstream and the combination of coding tools although the values of low-level SEs are decided by a method based on the constrained-random generation. The test bitstreams for the HEVC decoders generated by the proposed method have the SE coverage of 92.6%.

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