Patents by Inventor Erwin Pfeffer
Erwin Pfeffer has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11074180Abstract: An enhanced dynamic address translation facility product is created such that, in one embodiment, a virtual address to be translated and an initial origin address of a translation table of the hierarchy of translation tables are obtained. Dynamic address translation of the virtual address proceeds. In response to a translation interruption having occurred during dynamic address translation, bits are stored in a translation exception qualifier (TXQ) field to indicate that the exception was either a host DAT exception having occurred while running a host program or a host DAT exception having occurred while running a guest program. The TXQ is further capable of indicating that the exception was associated with a host virtual address derived from a guest page frame real address or a guest segment frame absolute address. The TXQ is further capable of indicating that a larger or smaller host frame size is preferred to back a guest frame.Type: GrantFiled: March 19, 2019Date of Patent: July 27, 2021Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATIONInventors: Dan F. Greiner, Lisa C. Heller, Damian L. Osisek, Erwin Pfeffer
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Patent number: 10977190Abstract: What is provided is an enhanced dynamic address translation facility. In one embodiment, a virtual address to be translated and an initial origin address of a translation table of the hierarchy of translation tables are obtained. Based on the origin address, a segment table entry is obtained which contains a format control field and an access validity field. If the format control and access validity are enabled, the segment table entry further contains an access control and fetch protection fields, and a segment-frame absolute address. Store operations to the block of data are permitted only if the access control field matches a program access key provided by either a Program Status Word or an operand of a program instruction being executed. Fetch operations from the desired block of data are permitted only if the program access key associated with the virtual address is equal to the segment access control field.Type: GrantFiled: June 20, 2019Date of Patent: April 13, 2021Assignee: International Business Machines CorporationInventors: Dan F. Greiner, Charles W. Gainey, Jr., Lisa C. Heller, Damian L. Osisek, Erwin Pfeffer, Timothy J. Slegel, Charles F. Webb
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Publication number: 20190303301Abstract: What is provided is an enhanced dynamic address translation facility. In one embodiment, a virtual address to be translated and an initial origin address of a translation table of the hierarchy of translation tables are obtained. Based on the origin address, a segment table entry is obtained which contains a format control field and an access validity field. If the format control and access validity are enabled, the segment table entry further contains an access control and fetch protection fields, and a segment-frame absolute address. Store operations to the block of data are permitted only if the access control field matches a program access key provided by either a Program Status Word or an operand of a program instruction being executed. Fetch operations from the desired block of data are permitted only if the program access key associated with the virtual address is equal to the segment access control field.Type: ApplicationFiled: June 20, 2019Publication date: October 3, 2019Applicant: International Business Machines CorporationInventors: Dan F. GREINER, Charles W. GAINEY, Jr., Lisa C. HELLER, Damian L. OSISEK, Erwin PFEFFER, Timothy J. SLEGEL, Charles F. WEBB
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Patent number: 10423539Abstract: What is provided is an enhanced dynamic address translation facility. In one embodiment, a virtual address to be translated and an initial origin address of a translation table of the hierarchy of translation tables are obtained. Based on the origin address, a segment table entry is obtained which contains a format control field and an access validity field. If the format control and access validity are enabled, the segment table entry further contains an access control and fetch protection fields, and a segment-frame absolute address. Store operations to the block of data are permitted only if the access control field matches a program access key provided by either a Program Status Word or an operand of a program instruction being executed. Fetch operations from the desired block of data are permitted only if the program access key associated with the virtual address is equal to the segment access control field.Type: GrantFiled: December 4, 2017Date of Patent: September 24, 2019Assignee: International Business Machines CorporationInventors: Dan F. Greiner, Charles W. Gainey, Jr., Lisa C. Heller, Damian L. Osisek, Erwin Pfeffer, Timothy J. Slegel, Charles F. Webb
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Publication number: 20190213126Abstract: An enhanced dynamic address translation facility product is created such that, in one embodiment, a virtual address to be translated and an initial origin address of a translation table of the hierarchy of translation tables are obtained. Dynamic address translation of the virtual address proceeds. In response to a translation interruption having occurred during dynamic address translation, bits are stored in a translation exception qualifier (TXQ) field to indicate that the exception was either a host DAT exception having occurred while running a host program or a host DAT exception having occurred while running a guest program. The TXQ is further capable of indicating that the exception was associated with a host virtual address derived from a guest page frame real address or a guest segment frame absolute address. The TXQ is further capable of indicating that a larger or smaller host frame size is preferred to back a guest frame.Type: ApplicationFiled: March 19, 2019Publication date: July 11, 2019Inventors: Dan F. Greiner, Lisa C. Heller, Damian L. Osisek, Erwin Pfeffer
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Patent number: 10241910Abstract: An enhanced dynamic address translation facility product is created such that, in one embodiment, a virtual address to be translated and an initial origin address of a translation table of the hierarchy of translation tables are obtained. Dynamic address translation of the virtual address proceeds. In response to a translation interruption having occurred during dynamic address translation, bits are stored in a translation exception qualifier (TXQ) field to indicate that the exception was either a host DAT exception having occurred while running a host program or a host DAT exception having occurred while running a guest program. The TXQ is further capable of indicating that the exception was associated with a host virtual address derived from a guest page frame real address or a guest segment frame absolute address. The TXQ is further capable of indicating that a larger or smaller host frame size is preferred to back a guest frame.Type: GrantFiled: July 10, 2017Date of Patent: March 26, 2019Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATIONInventors: Dan F Greiner, Lisa C Heller, Damian L Osisek, Erwin Pfeffer
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Patent number: 10078585Abstract: An enhanced dynamic address translation facility product is created such that, in one embodiment, a virtual address to be translated and an initial origin address of a translation table of the hierarchy of translation tables are obtained. Dynamic address translation of the virtual address proceeds. In response to a translation interruption having occurred during dynamic address translation, bits are stored in a translation exception qualifier (TXQ) field to indicate that the exception was either a host DAT exception having occurred while running a host program or a host DAT exception having occurred while running a guest program. The TXQ is further capable of indicating that the exception was associated with a host virtual address derived from a guest page frame real address or a guest segment frame absolute address. The TXQ is further capable of indicating that a larger or smaller host frame size is preferred to back a guest frame.Type: GrantFiled: July 27, 2015Date of Patent: September 18, 2018Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATIONInventors: Dan F Greiner, Lisa C Heller, Damian L Osisek, Erwin Pfeffer
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Patent number: 9934159Abstract: What is provided is an enhanced dynamic address translation facility. In one embodiment, a virtual address to be translated is first obtained and an initial origin address of a translation table of the hierarchy of translation tables is obtained. Based on the obtained initial origin, a segment table entry is obtained. The segment table entry is configured to contain a format control and access validity fields. If the format control and access validity fields are enabled, the segment table entry further contains an access control field, a fetch protection field, and a segment-frame absolute address. Store operations are permitted only if the access control field matches a program access key provided by any one of a Program Status Word or an operand of a program instruction being emulated. Fetch operations are permitted if the program access key associated with the virtual address is equal to the segment access control field or the fetch protection field is not enabled.Type: GrantFiled: May 20, 2016Date of Patent: April 3, 2018Assignee: International Business Machines CorporationInventors: Dan F. Greiner, Charles W. Gainey, Jr., Lisa C. Heller, Damian L. Osisek, Erwin Pfeffer, Timothy J. Slegel, Charles F. Webb
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Publication number: 20180089103Abstract: What is provided is an enhanced dynamic address translation facility. In one embodiment, a virtual address to be translated and an initial origin address of a translation table of the hierarchy of translation tables are obtained. Based on the origin address, a segment table entry is obtained which contains a format control field and an access validity field. If the format control and access validity are enabled, the segment table entry further contains an access control and fetch protection fields, and a segment-frame absolute address. Store operations to the block of data are permitted only if the access control field matches a program access key provided by either a Program Status Word or an operand of a program instruction being executed. Fetch operations from the desired block of data are permitted only if the program access key associated with the virtual address is equal to the segment access control field.Type: ApplicationFiled: December 4, 2017Publication date: March 29, 2018Inventors: Dan F. GREINER, Charles W. Gainey, JR., Lisa C. Heller, Damian L. Osisek, Erwin Pfeffer, Timothy J. Slegel, Charles F. Webb
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Publication number: 20180081800Abstract: An enhanced dynamic address translation facility product is created such that, in one embodiment, a virtual address to be translated and an initial origin address of a translation table of the hierarchy of translation tables are obtained. Dynamic address translation of the virtual address proceeds. In response to a translation interruption having occurred during dynamic address translation, bits are stored in a translation exception qualifier (TXQ) field to indicate that the exception was either a host DAT exception having occurred while running a host program or a host DAT exception having occurred while running a guest program. The TXQ is further capable of indicating that the exception was associated with a host virtual address derived from a guest page frame real address or a guest segment frame absolute address. The TXQ is further capable of indicating that a larger or smaller host frame size is preferred to back a guest frame.Type: ApplicationFiled: July 27, 2015Publication date: March 22, 2018Inventors: Dan F. Greiner, Lisa C. Heller, Damian L. Osisek, Erwin Pfeffer
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Publication number: 20170315910Abstract: An enhanced dynamic address translation facility product is created such that, in one embodiment, a virtual address to be translated and an initial origin address of a translation table of the hierarchy of translation tables are obtained. Dynamic address translation of the virtual address proceeds. In response to a translation interruption having occurred during dynamic address translation, bits are stored in a translation exception qualifier (TXQ) field to indicate that the exception was either a host DAT exception having occurred while running a host program or a host DAT exception having occurred while running a guest program. The TXQ is further capable of indicating that the exception was associated with a host virtual address derived from a guest page frame real address or a guest segment frame absolute address. The TXQ is further capable of indicating that a larger or smaller host frame size is preferred to back a guest frame.Type: ApplicationFiled: July 10, 2017Publication date: November 2, 2017Inventors: Dan F Greiner, Lisa C. Heller, Damian L. Osisek, Erwin Pfeffer
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Publication number: 20160267017Abstract: What is provided is an enhanced dynamic address translation facility. In one embodiment, a virtual address to be translated is first obtained and an initial origin address of a translation table of the hierarchy of translation tables is obtained. Based on the obtained initial origin, a segment table entry is obtained. The segment table entry is configured to contain a format control and access validity fields. If the format control and access validity fields are enabled, the segment table entry further contains an access control field, a fetch protection field, and a segment-frame absolute address. Store operations are permitted only if the access control field matches a program access key provided by any one of a Program Status Word or an operand of a program instruction being emulated. Fetch operations are permitted if the program access key associated with the virtual address is equal to the segment access control field or the fetch protection field is not enabled.Type: ApplicationFiled: May 20, 2016Publication date: September 15, 2016Applicant: International Business Machines CorporationInventors: Dan F. GREINER, Charles W. GAINEY, JR., Lisa C. HELLER, Damian L. OSISEK, Erwin PFEFFER, Timothy J. SLEGEL, Charles F. WEBB
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Patent number: 9378128Abstract: What is provided is an enhanced dynamic address translation facility. In one embodiment, a virtual address to be translated is first obtained and an initial origin address of a translation table of the hierarchy of translation tables is obtained. Based on the obtained initial origin, a segment table entry is obtained. The segment table entry is configured to contain a format control and access validity fields. If the format control and access validity fields are enabled, the segment table entry further contains an access control field, a fetch protection field, and a segment-frame absolute address. Store operations are permitted only if the access control field matches a program access key provided by any one of a Program Status Word or an operand of a program instruction being emulated. Fetch operations are permitted if the program access key associated with the virtual address is equal to the segment access control field or the fetch protection field is not enabled.Type: GrantFiled: February 27, 2015Date of Patent: June 28, 2016Assignee: International Business Machines CorporationInventors: Dan F. Greiner, Charles W. Gainey, Jr., Lisa C. Heller, Damian L. Osisek, Erwin Pfeffer, Timothy J. Slegel, Charles F. Webb
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Patent number: 9244856Abstract: An enhanced dynamic address translation facility is provided. In one embodiment, a virtual address to be translated and an initial origin address of a translation table of the hierarchy of translation tables are obtained. An index portion of the virtual address is used to reference an entry in the translation table. If a format control field contained in the translation table entry is enabled, the table entry contains a frame address of a large block of data of at least 1M byte in size. The frame address is then combined with an offset portion of the virtual address to form the translated address of a small 4K byte block of data in main storage or memory.Type: GrantFiled: December 19, 2013Date of Patent: January 26, 2016Assignee: International Business Machines CorporationInventors: Dan F Greiner, Lisa C Heller, Damian L Osisek, Erwin Pfeffer, Timothy J Siegel, Charles F Webb
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Publication number: 20150339226Abstract: An enhanced dynamic address translation facility product is created such that, in one embodiment, a virtual address to be translated and an initial origin address of a translation table of the hierarchy of translation tables are obtained. Dynamic address translation of the virtual address proceeds. In response to a translation interruption having occurred during dynamic address translation, bits are stored in a translation exception qualifier (TXQ) field to indicate that the exception was either a host DAT exception having occurred while running a host program or a host DAT exception having occurred while running a guest program. The TXQ is further capable of indicating that the exception was associated with a host virtual address derived from a guest page frame real address or a guest segment frame absolute address. The TXQ is further capable of indicating that a larger or smaller host frame size is preferred to back a guest frame.Type: ApplicationFiled: July 27, 2015Publication date: November 26, 2015Inventors: Dan F. Greiner, Lisa C. Heller, Damian L. Osisek, Erwin Pfeffer
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Patent number: 9092351Abstract: An enhanced dynamic address translation facility product is created such that, in one embodiment, a virtual address to be translated and an initial origin address of a translation table of the hierarchy of translation tables are obtained. Dynamic address translation of the virtual address proceeds. In response to a translation interruption having occurred during dynamic address translation, bits are stored in a translation exception qualifier (TXQ) field to indicate that the exception was either a host DAT exception having occurred while running a host program or a host DAT exception having occurred while running a guest program. The TXQ is further capable of indicating that the exception was associated with a host virtual address derived from a guest page frame real address or a guest segment frame absolute address. The TXQ is further capable of indicating that a larger or smaller host frame size is preferred to back a guest frame.Type: GrantFiled: February 27, 2014Date of Patent: July 28, 2015Assignee: International Business Machines CorporationInventors: Dan F Greiner, Lisa C Heller, Damian L Osisek, Erwin Pfeffer
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Publication number: 20150169437Abstract: What is provided is an enhanced dynamic address translation facility. In one embodiment, a virtual address to be translated is first obtained and an initial origin address of a translation table of the hierarchy of translation tables is obtained. Based on the obtained initial origin, a segment table entry is obtained. The segment table entry is configured to contain a format control and access validity fields. If the format control and access validity fields are enabled, the segment table entry further contains an access control field, a fetch protection field, and a segment-frame absolute address. Store operations are permitted only if the access control field matches a program access key provided by any one of a Program Status Word or an operand of a program instruction being emulated. Fetch operations are permitted if the program access key associated with the virtual address is equal to the segment access control field or the fetch protection field is not enabled.Type: ApplicationFiled: February 27, 2015Publication date: June 18, 2015Inventors: Dan F. GREINER, Charles W. GAINEY, JR., Lisa C. HELLER, Damian L. OSISEK, Erwin PFEFFER, Timothy J. SLEGEL, Charles F. WEBB
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Patent number: 9021225Abstract: What is provided is an enhanced dynamic address translation facility. In one embodiment, a virtual address to be translated is first obtained and an initial origin address of a translation table of the hierarchy of translation tables is obtained. Based on the obtained initial origin, a segment table entry is obtained. The segment table entry is configured to contain a format control and access validity fields. If the format control and access validity fields are enabled, the segment table entry further contains an access control field, a fetch protection field, and a segment-frame absolute address. Store operations are permitted only if the access control field matches a program access key provided by any one of a Program Status Word or an operand of a program instruction being emulated. Fetch operations are permitted if the program access key associated with the virtual address is equal to the segment access control field or the fetch protection field is not enabled.Type: GrantFiled: December 31, 2013Date of Patent: April 28, 2015Assignee: International Business Machines CorporationInventors: Dan F. Greiner, Charles W. Gainey, Jr., Lisa C. Heller, Damian L. Osisek, Erwin Pfeffer, Timothy J. Slegel, Charles F. Webb
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Patent number: 9003134Abstract: A translation table entry contains a change recording override field for controlling whether a change bit is to be set on a store or not. Each 4K byte block of main storage has an associated storage key comprising a change bit. The change recording override field controls whether change bit of the storage key associated with the desired 4K byte block of main storage is set to 1 for a store operation.Type: GrantFiled: December 30, 2013Date of Patent: April 7, 2015Assignee: International Business Machines CorporationInventors: Dan F Greiner, Lisa C Heller, Damian L Osisek, Erwin Pfeffer, Timothy J Slegel, Charles F Webb
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Patent number: 8862834Abstract: Aspects include a system, method and computer program product for providing a shared memory translation facility. The method includes receiving a request for access to a memory address from a requestor at a configuration, the receiving at a shared memory translation mechanism. It is determined whether the memory address refers to a shared memory object (SMO), the SMO accessible by a plurality of configurations managed in different zones of memory. Based on determining that the memory address refers to the SMO, it is determined whether the configuration has access to the SMO. Based on determining that the configuration has access to the SMO, the requestor is provided a system absolute address for the SMO and access to the SMO. In this manner direct interchange of data between the configuration and the plurality of configurations is allowed.Type: GrantFiled: July 25, 2013Date of Patent: October 14, 2014Assignee: International Business Machines CorporationInventors: Dan F. Greiner, Lisa C. Heller, Damian L. Osisek, Erwin Pfeffer, Donald W. Schmidt, Jaya Srikrishnan, Charles F. Webb, Leslie W. Wyman