Information processing apparatus and program for controlling the same

• US 8,046,664 B2
• Filed: 12/18/2007
• Issued: 10/25/2011
• Est. Priority Date: 12/20/2006
• Status: Expired due to Fees

• Current Assignee: DENSO Corporation
• Original Assignee: DENSO Corporation
• Inventors: Tsubouchi, Kazuo
• Primary Examiner(s): KERVEROS, DEMETRIOS C
• Application Number:
  US12/000,887
• Publication Number:
  US 20080155209A1
• Time in Patent Office: 1,407 Days
• Field of Search: 714/718, 714/763
• US Class Current: 714/763
• CPC Class Codes: G06F 11/1417 Boot up procedures
• CPC Class Codes: G06F 11/2015 Redundant power supplies power supply failure G06F1/30
• CPC Class Codes: G06F 9/445 Program loading or initiating bootstrapping G06F9/4401; security arrangements for program loading or initiating G06F21/57

Abstract

An information processing apparatus is configured to be backed up by a battery so that information in a main memory of the apparatus can be retained when a power supply for the apparatus is stopped. The apparatus stores kernel information in a kernel information table at a time of an initial program loading so that the kernel information stored in the kernel information table can be delivered to a kernel for restarting a program. The program can be started by receiving the kernel information from the kernel information table without retrieving the program from a memory medium or re-generating the kernel information. The apparatus with an operating system that has a relocation function for use in a vehicle can thus have a reduced system startup time.

Claims

1. An information processing apparatus as a navigation device, comprising:

a memory that stores information;

a storage unit that stores a program; and

a control unit that controls expansion and execution of the program in the memory at a location with an address determined by a function of an operating system, wherein

the control unit controls the memory to store, kernel information in the memory, the kernel information including program identification information for identifying the program and address information for identifying an expansion area of the program when the program is retrieved from the storage unit and expanded in the memory,

the control unit determines whether the program is expanded in the memory with reference to the kernel information stored in the memory when the program is required to be executed after initialization of the control unit, and

the control unit executes the program expanded in the memory by utilizing the kernel information without retrieving the program from the storage unit when the program is determined to be expanded in the memory.

2. The information processing apparatus of claim 1, wherein

the control unit calculates a CRC value of the kernel information for storage in the memory when the kernel information is stored,

the control unit verifies consistency or inconsistency of the kernel information stored in the memory utilizing the CRC value of the kernel information when the control unit determines whether the program is expanded in the memory, and

the control unit executes the program by retrieving the program from the storage unit without executing the program expanded in the memory without regard to a result of the determination of whether the program is expanded in memory when inconsistency in the kernel information is verified.

3. The information processing apparatus of claim 1, wherein

the address information at least includes code address information that indicates an address of a program code expansion area where a code of the program is expanded and data address information that indicates an address of a data expansion area where data is expanded for use at a time when the program is executed.

4. The information processing apparatus of claim 3, wherein

the control unit calculates a CRC value of the code expansion area of the program;

the control unit controls the memory to further store the CRC value of the code expansion area of the program as kernel information; and

the control unit executes the program by retrieving the program again from the storage unit without executing the program expanded in the memory when the CRC value of the code expansion area of the program in the memory is found to be inconsistent in a verification of consistency or inconsistency of the code expansion area, after the control unit has determined that the program is expanded in the memory.

5. The information processing apparatus of claim 3, wherein

the control unit calculates a CRC value of the data expansion area of the program;

the control unit controls the memory to further store the CRC value of the data code expansion area of the program as kernel information; and

the control unit executes the program by retrieving the program again from the storage unit without executing the program expanded in the memory when the CRC value of the data expansion area of the program in the memory is found to be inconsistent in a verification of consistency or inconsistency of the data expansion area, after the control unit has determined that the program is expanded in the memory.

6. A control program retrievably stored in a memory and executed by a control unit for controlling an information processing apparatus as a navigation system that has a memory to store information, a storage unit to store a program, the control unit controlling expansion and execution of the program in the memory at a location with an address determined by a function of an operating system, the control program comprising:

controlling the memory to store kernel information in the memory, the kernel information including program identification information for identifying the program and address information for identifying an expansion area of the program when the program is retrieved from the storage unit and expanded in the memory by the function of the operating system,

determining whether the program is expanded in the memory with reference to the kernel information stored in the memory prior to retrieval of the program from the storage unit by the operating system when the program is required to be executed after initialization of the control unit, and

when it is determined that the program is expanded in the memory, controlling the operating system to execute the program expanded in the memory by passing the kernel information to the operating system and preventing the operating system from retrieving the program from the storage unit.

7. The control program of claim 6, wherein

the control program calculates a CRC value of the kernel information for storage in the memory when the kernel information is stored,

the control program verifies consistency or inconsistency of the kernel information stored in the memory by utilizing the CRC value of the kernel information when the control unit determines whether the program is expanded in the memory, and

the control program controls the operating system to execute the program by retrieving the program from the storage unit without allowing the operating system to execute the program that is expanded in the memory without regard to a result of the determination of whether the program is expanded in memory when inconsistency in the kernel information is verified.

8. The control program of claim 6, wherein

the address information at least includes code address information that indicates an address of a program code expansion area where a code of the program is expanded and data address information that indicates an address of a data expansion area where data is expanded for use at a time when the program is executed.

9. The control program of claim 8, wherein

the control program calculates a CRC value of the code expansion area of the program;

the control program controls the memory to further store the CRC value of the code expansion area of the program as kernel information; and

the control program controls the operating system to execute the program by retrieving the program again from the storage unit without allowing an execution of the program expanded in the memory when the CRC value of the code expansion area of the program in the memory is found to be inconsistent in a verification of consistency or inconsistency of the code expansion area, after the control program has affirmatively determined that the program is expanded in memory.

10. The control program of claim 8, wherein

the control program calculates a CRC value of the data expansion area of the program;

the control program controls the memory to further store the CRC value of the data expansion area of the program as kernel information; and

the control program controls the operating system to execute the program by retrieving the program again from the storage unit without allowing the operating system to execute the program expanded in the memory when the CRC value of the data expansion area of the program in the memory is found to be inconsistent in a verification of consistency or inconsistency of the data expansion area, after the control program has affirmatively determined that the program is expanded in memory.

11. A control unit in a navigation device comprising:

a random-access memory (RAM) that stores data;

a read-only memory (ROM) that stores an application program; and

a central processing unit (CPU) that operates an operating system (OS), and controls expansion and execution of the application program in the ROM at a location with an address determined by an OS function, wherein

when the application program is retrieved from the ROM for a first execution, the CPU causes kernel information identifying the application program and address information identifying an expansion area in the RAM to be stored in a kernel information table stored in the RAM;

upon any subsequent execution of the application program, the CPU determines whether the application program is then expanded in the RAM with reference to kernel information stored in the kernel information table, and in any subsequent execution when the application program is determined to be then expanded, the CPU executes the application program expanded in the RAM based on the kernel information rather than retrieving the application program from the ROM.