Information processing apparatus method of booting information processing apparatus at a high speed

• US 6,374,353 B1
• Filed: 03/03/1999
• Issued: 04/16/2002
• Est. Priority Date: 03/16/1998
• Status: Expired due to Fees

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Baba, Noriyuki, Sugai, Naoto, Settsu, Atsushi
• Primary Examiner(s): Heckler, Thomas M.
• Application Number:
  US09/261,255
• Time in Patent Office: 1,140 Days
• Field of Search: 713/2
• US Class Current: 713/2
• CPC Class Codes: G06F 9/4406 Loading of operating system

Abstract

A method of booting up an information processing apparatus is provided. An operating system is divided into a mini operating system (OS) module having a function of bootstrap and an OS main body module having functions other than the function of bootstrap. The mini OS module can be located in a boot block of a boot device, whereas the OS main body module can be located in a file system of the boot device. A firmware or F/W code module stored in a ROM loads the mini OS module into memory when booting up the information processing apparatus. The mini OS module then loads the OS main body module into memory and then initializes the OS main body module.

Claims

1. An information processing apparatus comprising:

a boot device divided into a boot block in which a mini operating system (OS) module having a function of bootstrap is located and a file system in which an operating system (OS) main body module having functions other than said function of bootstrap; and

a read-only memory or ROM in which a firmware or F/W code module is located for loading said mini OS module located in said boot block into a memory and for starting execution of said mini OS module instead of a bootstrap code when booting up said information processing apparatus, said mini OS module loading said OS main body module from said file system of said boot device into said memory, and said mini OS module being linked to said OS main body module.

2. A method of booting up an information processing apparatus comprising a boot device and a memory by loading an operating system into the memory, comprising the steps of:

dividing the operating system into a mini operating system (OS) module having a function of bootstrap and an operating system (OS) main body module having functions other than said function of bootstrap, said mini OS module including a mini kernel module that is a basic part of the operating system, a boot device driver module for performing input/output (I/O) operations on said boot device, and an OS loading and initialization processing module for loading said OS main body module into said memory and for initializing said OS main body module;

locating said mini OS module in a boot block of said boot device;

locating said OS main body module in a file system of said boot device;

a firmware or F/W code module being stored in a ROM and loading said mini OS module located in said boot block into said memory when booting up said information processing apparatus;

said mini OS module initializing said mini kernel module and said boot device driver module;

said mini OS module generating and starting execution of a thread for said OS loading and initialization processing module; and

said OS loading and initialization processing module loading said OS main body module stored in said file system into said memory and then initializing said OS main body module.

3. The method according to claim 2, wherein said OS main body module is divided into a plurality of functional modules including a device driver module, which are located as separate files in said file system, and said OS loading and initialization processing module is divided into an OS loading processing module for loading each of said plurality of functional modules into said memory and an OS initialization module for initializing each of said plurality of functional modules loaded into said memory by said OS loading processing module, and wherein after said mini OS module is loaded into said memory, said mini OS module initializes said mini kernel module and said boot device driver module and then generates and starts execution of a thread for said OS loading processing module, after the thread for said OS loading processing module is started, said OS loading processing module loads each of said plurality of functional modules into said memory and then generates and starts execution of a thread for said OS initialization module every time it loads each of said plurality of functional modules, and, after the thread for said OS initialization module is started, said OS initialization module initializes each of said plurality of functional modules loaded into said memory.

4. The method according to claim 3, wherein said plurality of functional modules, into which said OS main body module is divided, are stored as compressed files in said file system and said loading and initialization processing module of said mini OS module is divided into an OS loading and decompression processing module and an OS initialization module, and wherein said mini OS module generates and starts execution of a thread for said OS loading and decompression processing module after said mini OS module initializes said mini kernel module and said boot device driver module, after the thread for said OS loading and decompression processing module is started, said OS loading and decompression processing module loads each of said plurality of functional modules into said memory and decompresses the loaded functional module, and then generates and starts execution of a thread for said OS initialization module, and after the thread for said OS initialization module is executed, said OS initialization module initializes each of said plurality of functional modules loaded into said memory and decompressed.

5. The method according to claim 4, wherein said OS loading and decompression processing module is divided into an OS loading processing module and an OS decompression processing module, and wherein said mini OS module generates and starts execution of a thread for said OS loading processing module after said mini OS module initializes said mini kernel module and said boot device driver module, after the thread for said OS loading processing module is started, said OS loading processing module loads each of said plurality of compressed functional modules into said memory, and then generates and starts execution of a thread for said OS decompression processing module, after the thread for said OS decompression processing module is started, said OS decompression processing module decompresses each of the plurality of compressed functional module loaded into said memory and then generates and starts execution of a thread for said OS initialization module, and, after the thread for said OS initialization module is started, said OS initialization module initializes each of said functional modules loaded into said memory and decompressed by said OS decompression processing module.

6. The method according to claim 3, wherein said OS loading processing module of said mini OS module is an application (AP) execution and OS loading processing module for starting execution of at least a predetermined application module which is located in said file system and which can automatically be started and run on the operating system when booting up said information processing apparatus, and for loading each of said plurality of functional modules into said memory, and said predetermined application module includes a function definition file in which some functional modules required for said application module to run on said operating system are listed, and wherein after said mini OS module is loaded into said memory, said mini OS module initializes said mini kernel module and said boot device driver module and then generates and starts execution of a thread for said AP execution and OS loading processing module, after the thread for said AP execution and OS loading processing module is started, said AP execution and OS loading processing module loads said application module from said file system into said memory and further loads some functional modules required for said application module into said memory according to said function definition file included in said application module, and then generates and starts execution of a thread for said OS initialization module, after the thread for said OS initialization module is started, said OS initialization module then initializes each of said some functional modules loaded into said memory, and, after the initialization of all of said some functional modules is completed, said application execution and OS loading processing module further loads the remainder of all functional modules included in said OS main body module into said memory and initializes the remainder using said OS initialization processing module while starting execution of said application module as a process.

7. The method according to claim 2, wherein said mini OS module includes a thread synchronization module for providing synchronization between a thread for said OS loading processing module and a thread for said OS initialization module using said mini kernel module, and wherein said mini OS module generates and starts execution of a thread for said OS loading processing module and a thread for said OS initialization module after said mini OS module initializes said mini kernel module and said boot device driver module, after those threads are started, said OS initialization module brings itself into a state in which it is waiting for a request for initialization of a functional module through said thread synchronization module, every time said OS loading processing module loads each of said plurality of functional modules into said memory, said OS loading processing module makes a request of said OS initialization module for initialization of each of said plurality of functional modules through said thread synchronization module, and said OS initialization module initializes each of said plurality of functional modules loaded into said memory every time said OS initialization module receives a request for initialization of each of said plurality of functional modules loaded into said memory from said OS loading processing module, and then waits for another request for initialization.

8. The method according to claim 2, wherein said OS loading and initialization processing module of said mini OS module is divided into an OS loading processing module and an OS initialization module, said OS main body module is divided into a plurality of blocks of arbitrary record size, each of which includes a loading flag consisting of a plurality of bits respectively corresponding to said plurality of functional modules included in said OS main body module, and, said loading flag of one of said plurality of blocks including the end of any one of said plurality of functional modules has a corresponding bit set to a predetermined value, and wherein after said mini OS module is loaded into said memory, said mini OS module initializes said mini kernel module and said boot device driver module and then generates and starts execution of a thread for said OS loading processing module, after the thread for said OS loading processing module is started, said loading processing module loads each of said plurality of blocks of said OS main, body module into said memory, and refers to said loading flag every time it loads each of said plurality of blocks into said memory, only if a bit of said loading flag is set to a predetermined value, said OS loading processing module generates and starts execution of a thread for said OS initialization module, and, after the thread for said OS initialization module is started, said OS initialization module initializes a corresponding one of said plurality of functional modules loaded into said memory.

9. The method according to claim 2, wherein said OS loading and initialization processing module is divided into an OS loading processing module and an OS initialization module, said OS main body module is divided into a plurality of blocks of arbitrary record size, each of which includes a loading flag, and said loading flag of one of said plurality of blocks including the end of any one of said plurality of functional modules has the address of a linkage processing function of linking said one functional module with said mini OS module and the address of an initialization processing function of initializing said one functional module, and wherein after said mini OS module is loaded into said memory, said mini OS module initializes said mini kernel module and said boot device driver module and then generates and starts execution of a thread for said OS loading processing module, after the thread for said OS loading processing module is started, said loading processing module loads each of said plurality of blocks of said OS main body module into said memory, and refers to said loading flag every time it loads each of said plurality of blocks into said memory, only if said loading flag has a value other than zero, said OS loading processing module generates and starts execution of a thread for said OS initialization module, and, after the thread for said OS initialization module is started, said OS initialization module calls a linkage processing function and an initialization processing function according to the value of said loading flag.

10. The method according to claim 2, further comprising the steps of, in order to generate said mini OS module and said OS main body module, combining an object file of said mini OS module and an object file of said OS main body module into an operating system file by using a linkage editor or linker, and dividing said operating system file into said mini OS module and said OS main body module according to link information.

11. A method of booting-up an information processing apparatus comprising a boot device and a memory by loading an operating system into the memory, comprising the steps of:

dividing the operating system into a mini operating system (OS) module having a function of bootstrap and operating system (OS)main body module having functions other than said function of bootstrap, said mini OS module including a mini kernel module that is a basic part of the operating system, a boot device driver module for performing input/output (I/O) operations on said boot device, and an OS loading and initialization processing module for loading said OS main body module into said memory and for initializing said OS main body module;

locating said mini OS module in a read-only memory or ROM;

locating said OS main body module in a file system of said boot device;

a firmware or F/W code module being stored in said ROM and directly executing said mini OS module located in said ROM when booting tip said information processing apparatus;

said mini OS module loading only data portions of said mini kernel module, said boot device driver module, and said OS loading and initialization processing module into said memory;

said mini OS module initializing said mini kernel module and said boot device driver module;

said mini OS module generating and starting execution of a thread for said OS loading and initialization processing module; and

said OS loading and initialization processing module loading said OS main body module stored in said file system into said memory and then initializing said OS main body module.

12. The method according to claim 11, wherein said mini OS module further includes an address resolve table used for linking said mini OS module with said OS main body module, and wherein after said mini OS module generates and starts execution of a thread for said OS loading-and initialization processing module, said OS loading and initialization processing module loads said OS main body module into said memory and then initializes it, loads a first process to be executed first, into said memory, loads code portions of said mini kernel module and said boot device driver module into said memory, and writes addresses of said code portions loaded into said memory into said address resolve table.