Renesas Electronics Corporation

Yasuhiro Sugita

Koji Adachi

Yoichi Yuyama

A data processing device that can monitor properly the state of the interrupt processing of a virtual machine is provided. The data processing device according to an aspect of the present disclosure includes an arithmetic unit that executes multiple virtual machines, respectively, and an interrupt controller that instructs execution of the interrupt processing to the arithmetic unit with the virtual machine information to specify at least one of the multiple virtual machines. The interrupt controller includes a counter to count the number of interrupts for each virtual machine based on the virtual machine information.

Interrupt processing using virtual machines

The data processing apparatus includes a memory protection setting storage unit capable of storing a plurality of address sections as memory protection setting targets, a plurality of first determination units provided for each of the address sections stored in the memory protection setting storage unit and provisionally determining whether or not an access request is permitted based on whether or not an access destination address specified by the access request corresponds to the address section acquired from the memory protection setting storage unit, and a second determination unit finally determining whether or not the access request is permitted based on the classification information and the results of provisional determinations by the first determination unit.

Data processing apparatus and memory protection method

Executing interrupt processing of virtual machines using processor's arithmetic unit

There is a need to provide a semiconductor device that improves an interrupt capability of a virtual machine. A semiconductor device includes a memory to store a plurality of virtual machines and a virtual machine manager to manage the virtual machines and a CPU to perform the virtual machines and the virtual machine manager. The CPU causes an active virtual machine to perform an interrupt process when information (first information) about an interrupt-processing virtual machine is equal to information (second information) about the active virtual machine. When the first information differs from the second information, the CPU causes the virtual machine manager to stop the active virtual machine and operates the interrupt-processing virtual machine to perform an interrupt process.

Semiconductor device

According to one embodiment, a data processing apparatus includes an access controller configured to control access by a CPU to a processor. The access controller selects permission configuration information and an identifier table to be used for the access control using processor selection information output from the CPU, determines as intermediate identifier MID that corresponds to an access request identifier SPID output from the CPU using the selected identifier table, and determines accessibility of the CPU to the processor using the selected permission configuration information and the determined intermediate identifier MID.

Data processing apparatus and access control method

A cache control device includes an area determination unit that determines an area of a cache memory which is allocated to each instruction flow on the basis of an allocation ratio of an execution time per unit time, which is allocated to each of a plurality of the instruction flows by a CPU. The area determination unit specifies the area allocated to the specified instruction flow in response to an access request from a memory access unit, and accesses the specified area in the cache memory.

Growing community of inventors

Tokyo, Japan

Yasuhiro Sugita