US4970641A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exception handling in a pipelined microprocessor
Assignee: International Business Machines Corp
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Filing: 1989-04-26
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Granted: 1990-11-13
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Expires: 2009-04-26
Abstract
Abstract A method for processing address translation exceptions occurring in a virtual memory system employing demand paging and having a plurality of registers and a real storage area, includes the steps of: (a) temporarily storing for each storage operation; (i) the effective storage address for the operation; (ii) exception control word information relative to the ones of the registers involved in the operation and the length and type of the operation; and (iii) any data to be stored during the operation; (b) retrieving the temporarily stored information to form an exception status block if an exception is generated indicating a failed operation; and (c) reinitiating the failed operation based on the information contained in the exception status block.
Inventors
- 👤 Phillip D. Hester
- 👤 William A. Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:24
CPC Classifications
G; G11; G11C; G11C29/00; G11C29/70; G11C29/88; G06; G06F; G06F12/00; G06F12/02; G06F12/08; G06F12/10; G06F11/00; G06F11/07; G06F11/0703; G06F11/0751; G06F11/0754; G06F11/076
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
169 words
A method for processing one or more address translation exceptions during storage operations involving loading or storing of data in a virtual memory system having a single central processing unit and employing demand paging and having a plurality of registers and a real storage area, said system having effective storage addresses for loading or storing of said data and utilizing said registers in said storage operations, comprising the steps of: (a) temporarily storing for each of said storage operations; (i) said effective storage address for said operation; (ii) exception control word information relative to an identity of ones of said registers involved in said storage operations and a length of said data involved in said operation and a type of said operation; and (iii) any data to be stored during said operation; (b) retrieving said temporarily stored information to form an exception status block when an exception is generated indicating a failed operation; and (c) reinitiating said failed operation based on the information contained in said exception status block.
Claim 2
Independent Claim
169 words
A method for processing one or more address translation exceptions during storage operations involving loading or storing of data in a virtual memory system having a single central processing unit and employing demand paging and having a plurality of registers and a real storage area, said system having effective storage addresses for loading or storing of said data and utilizing said registers in said storage operations, comprising the steps of: (a) temporarily storing for each of said storage operations; (i) said effective storage address for said operation; (ii) exception control word information relative to an identity of ones of said registers involved in said storage operations and a length of said data involved in said operation and a type of said operation; and (iii) any data to be stored during said operation; (b) retrieving said temporarily stored information to form an exception status block when an exception is generated indicating a failed operation; and (c) reinitiating said failed operation based on the information contained in said exception status block.
Claim 3
Dependent Claim
22 words
A method in accordance with claim 1 including the step of maintaining a count of a number of said exceptions which occur.
Claim 4
Dependent Claim
30 words
A method in accordance with claim 1 including the step of storing a starting address in said real storage area where information relative to a failed storage operation is stored.
Claim 5
Dependent Claim
28 words
A method in accordance with claim 3 including the step of storing information relative to said failed operation in said storage area starting at said stored starting address.
Claim 6
Dependent Claim
19 words
A method in accordance with the claim 1 including the step of reinitiating sequentially failed ones of said operations.
Claim 7
Dependent Claim
21 words
A method in accordance with claim 5 in which said failed operations are reinitiated in the sequence in which they failed.
Claim 8
Dependent Claim
20 words
A method in accordance with claim 5 in which exception status blocks are formed for each of said failed operations.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-11-12 | 1994-05-14 | 1994-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-11-12 | 1998-05-14 | 1998-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-11-12 | 2002-05-14 | 2002-11-13 | $7700.00 | Window Closed / Lapsed |