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    APPARATUS AND METHOD FOR PREVENTING UNAUTHORIZED MODIFICATION TO BIOS IN A PERSONAL COMPUTER SYSTEM
    1.
    发明专利
    APPARATUS AND METHOD FOR PREVENTING UNAUTHORIZED MODIFICATION TO BIOS IN A PERSONAL COMPUTER SYSTEM 未知

    公开(公告)号：CA2020520C

    公开(公告)日：1995-08-15

    申请号：CA2020520

    申请日：1990-07-05

    Applicant: IBM

    Inventor： BEALKOWSKI RICHARD ,  BLACKLEDGE JOHN WILEY JR ,  CRONK DOYLE STANFILL ,  DAYAN RICHARD ALAN ,  KINNEAR SCOTT GERARD ,  KOVACH GEORGE D ,  PALKA MATTHEW STEPHEN JR ,  SACHSENMAIER ROBERT ,  ZYVOLOSKI KEVIN MARSHALL ,  WACHTEL EDWARD IRVING ,  DIXON JERRY DUANE ,  MCNEILL ANDREW BOYCE

    IPC: G06F13/10 ,  G06F9/445 ,  G06F12/14 ,  G06F21/22 ,  G06F12/16 ,  G06F12/06

    Abstract: An apparatus and method for protecting BIOS stored on a direct access storage device into a personal computer system. The personal computer system comprises a system processor, a system planar, a random access main memory, a read only memory, a protection means and at least one direct access storage device. The read only memory includes a first portion of BIOS and data representing the type of system processor and system planar I/O configuration. The first portion of BIOS initializes the system and the direct access storage device, and resets the protection means in order to read in a master boot record into the random access memory from a protectable partition on the direct access storage device. The master boot record includes a data segment and an executable code segment. The data segment includes data representing system hardware and a system configuration which is supported by the master boot record. The first BIOS portion confirms the master boot record is compatible with the system hardware by verifying that the data from the data segment of the master boot record agrees with the system processor, system planar, and planar I/O configuration. If the master boot record is compatible with the system hardware, the first BIOS portion vectors the system processor to execute the executable code segment of the master boot record. The executable code segment confirms that the system configuration has not changed and loads in the remaining BIOS portion from the same protectable partition on the direct access storage device into random access memory. The executable code segment then verifies the authenticity of the remaining BIOS portion and vectors the system processor to begin executing the BIOS now in random access memory. BIOS, executing in random access memory, then activates the protection means to prevent further access to the protectable partition. BIOS boots up the operating system to begin operation of the personal computer system.

    2.
    发明专利
    未知

    公开(公告)号：AT75070T

    公开(公告)日：1992-05-15

    申请号：AT87118539

    申请日：1987-12-15

    Applicant: IBM

    Inventor： DIXON JERRY DUANE ,  SOTOMAYOR GUY GIL JR

    IPC: G06F3/06 ,  G06F12/08 ,  G06F12/0866 ,  G06F12/16 ,  G11B20/18

    Abstract: In a DASD caching system, in which pages of sectors of data are stored by reading in a desired sector and prefetching a plurality of adjacent sectors for later access, errors in disk storage media cause error signals to be generated. Such errors are handled by storing indications of which sectors have errors and which do not, and accessing such indications in response to later requests for such sectors. Such indications are stored in each page in the cache. Further, a history is maintained of which pages and sectors therein, were placed in the cache in the past.

    3.
    发明专利
    未知

    公开(公告)号：DE3810233A1

    公开(公告)日：1988-10-20

    申请号：DE3810233

    申请日：1988-03-25

    Applicant: IBM

    Inventor： DIXON JERRY DUANE ,  SOTOMAYOR JR

    IPC: G06F3/06 ,  G06F12/08 ,  G06F12/0866 ,  G06F12/16 ,  G11B20/18

    Abstract: In a DASD caching system, in which pages of sectors of data are stored by reading in a desired sector and prefetching a plurality of adjacent sectors for later access, errors in disk storage media cause error signals to be generated. Such errors are handled by storing indications of which sectors have errors and which do not, and accessing such indications in response to later requests for such sectors. Such indications are stored in each page in the cache. Further, a history is maintained of which pages and sectors therein, were placed in the cache in the past.

    Loading method and apparatus for computer system
    8.
    发明专利
    Loading method and apparatus for computer system 未知

    公开(公告)号：SG44401A1

    公开(公告)日：1997-12-19

    申请号：SG1996000186

    申请日：1990-07-04

    Applicant: IBM

    Inventor： BEALKOWSKI RICHARD ,  BLACKLEDGE JOHN WILEY JR ,  CRONK DOYLE STANFILL ,  DAYAN RICHARD ALAN ,  KINNEAR SCOTT GERARD ,  KOVACH GEORGE D ,  PALKA MATTHEW STEPHEN JR ,  SACHSENMAIER ROBERT ,  ZYVOLOSKI KEVIN MARSHALL ,  DIXON JERRY DUANE ,  WACHTEL ANDREW BOYCE IRVING

    IPC: G06F9/06 ,  G06F9/445

    Abstract: An apparatus and method for loading BIOS stored on a direct access storage device (62,66) into a personal computer system (10). The personal computer system (10) comprises a system processor (26), a system planar (24), a random access main memory, a read only memory (36), and at least one direct access storage device (62,66). The read only memory (36) includes a first portion of BIOS and data representing the type of system processor (26) and system planar (24) I/O configuration. The first portion of BIOS initializes the system (10) and the direct access storage device (62,66) to read in a master boot record into the system (10) from the direct access storage device (62,66). The master boot record includes a data segment (122-138) and an executable code segment (120). The data segment (122-138) includes data representing system hardware and a system (10) configuration which is supported by the master boot record. The first BIOS portion confirms the master boot record is compatible with the system hardware by verifying that the data from the data segment (122-138) of the master boot record agrees with the system processor (26), system planar (24), and planar I/O configuration. If the master boot record is compatible with the system hardware, the first BIOS portion vectors the system processor (26) to execute the executable code segment (120) of the master boot record. The executable code segment (120) confirms that the system configuration has not changed and loads in the remaining BIOS portion from the direct access storage device (62,66) into random access memory (32). The executable code segment (120) then verifies the authenticity of the remaining BIOS portion and vectors the system processor (26) to begin executing the BIOS now in random access memory (32). BIOS executing in random access memory (32) then boots up the operating system to begin operation of the personal computer system (10).

    9.
    发明专利
    未知

    公开(公告)号：DE3778347D1

    公开(公告)日：1992-05-21

    申请号：DE3778347

    申请日：1987-12-15

    Applicant: IBM

    Inventor： DIXON JERRY DUANE ,  SOTOMAYOR JR

    IPC: G06F3/06 ,  G06F12/08 ,  G06F12/0866 ,  G06F12/16 ,  G11B20/18

    Abstract: In a DASD caching system, in which pages of sectors of data are stored by reading in a desired sector and prefetching a plurality of adjacent sectors for later access, errors in disk storage media cause error signals to be generated. Such errors are handled by storing indications of which sectors have errors and which do not, and accessing such indications in response to later requests for such sectors. Such indications are stored in each page in the cache. Further, a history is maintained of which pages and sectors therein, were placed in the cache in the past.

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