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Patent Agency Ranking
公开(公告)号：DE2963099D1
公开(公告)日：1982-08-05
申请号：DE2963099
申请日：1979-06-11
Applicant: IBM
Inventor： HOFFMAN ROY LOUIS , MITCHELL GLEN ROBERT , SOLTIS FRANK GERALD
Abstract: Address translation apparatus is provided for translating virtual addresses to real storage addresses and real storage addresses to virtual storage addresses. The address translation apparatus uses a page directory having a next real address and an associated virtual address ordered according to real addresses. This simplifies the manner in which the input/output (I/O) handles addressing in a virtual storage computer system. When the I/O device control mechanism needs to resolve the real I/O address register, it uses the contents of that register to index into the page directory to obtain a corresponding virtual address. The corresponding virtual address is incremented and converted to a real address which is used to index into the page directory. The virtual address taken from the page directory is then compared with the virtual address which had been incremented and translated. If the two compare then the real address which had been used to access the page directory is entered into a register so as to be available as a real main storage address. In actuality it is only a partial real main storage address and is concantenated with a byte identifier portion of the main storage address which requires no translation and which was a part of the original I/O real address for main storage.
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公开(公告)号：DE2964293D1
公开(公告)日：1983-01-20
申请号：DE2964293
申请日：1979-09-24
Applicant: IBM
Inventor： KINDSETH DOUGLAS MICHAEL , MITCHELL GLEN ROBERT
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公开(公告)号：DE2961891D1
公开(公告)日：1982-03-04
申请号：DE2961891
申请日：1979-09-24
Applicant: IBM
Inventor： MITCHELL GLEN ROBERT , KEMPKE WILLIAM GEORGE , JONES EUGENE REESE , HOUDEK MERLE EDWARD , RANWEILER JAMES GREGORY
Abstract: Tagged pointer handling apparatus is provided for implementation in a computer system wherein a tag bit is provided for each word in main storage. This invention provides for the mixing of data and pointers within the same storage space, and provides a capability for checking and verifying the validity of the pointers without affecting the performance or operation of other instructions. Only the tag instructions can set the tag bits ON in main storage; all other instructions store data and set the corresponding tag bits OFF. Thus, if a pointer was modified inadvertently by one of these data handling instructions, the fact that the pointer is untagged is detected and the values in the pointer are treated as invalid when the pointer is used by the Load and Verify Tags instruction. Instructions to load, store, set, move, extract and insert tags are implemented by the tagged pointer handling apparatus. A Load and Verify Tags instruction checks the validity of the pointer and if valid, loads the pointer into a specified general purpose register. A Store and Set Tags instruction stores the value in a specified general purpose register into main storage and sets the associated tag bits ON. A Move and Set Tags instruction moves a word from one location in main storage to another or the same location in main storage and sets the associated tag bits ON. A Move Characters and Tags instruction moves a word and the associated tag bits from one storage location to another storage location. An Extract Tags instruction fetches each word from an operand in main storage, extracts the tag bits, compresses the tag bits to one tag bit per quadword, and stores the tag bits in main storage as data. An Insert Tags instruction fetches the tag bits stored in main storage as data, expands the tag bits to one tag bit per word, and inserts them on each associated word of an operand in main storage.
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公开(公告)号：IT7926080D0
公开(公告)日：1979-09-28
申请号：IT2608079
申请日：1979-09-28
Applicant: IBM
Inventor： MITCHELL GLEN ROBERT , KEMPKE WILLIAM GEORGE , JONES EUGENE REESE , HOUDEK MERLE EDWARD , RANWEILER JAMES GREGORY
Abstract: Tagged pointer handling apparatus is provided for implementation in a computer system wherein a tag bit is provided for each word in main storage. This invention provides for the mixing of data and pointers within the same storage space, and provides a capability for checking and verifying the validity of the pointers without affecting the performance or operation of other instructions. Only the tag instructions can set the tag bits ON in main storage; all other instructions store data and set the corresponding tag bits OFF. Thus, if a pointer was modified inadvertently by one of these data handling instructions, the fact that the pointer is untagged is detected and the values in the pointer are treated as invalid when the pointer is used by the Load and Verify Tags instruction. Instructions to load, store, set, move, extract and insert tags are implemented by the tagged pointer handling apparatus. A Load and Verify Tags instruction checks the validity of the pointer and if valid, loads the pointer into a specified general purpose register. A Store and Set Tags instruction stores the value in a specified general purpose register into main storage and sets the associated tag bits ON. A Move and Set Tags instruction moves a word from one location in main storage to another or the same location in main storage and sets the associated tag bits ON. A Move Characters and Tags instruction moves a word and the associated tag bits from one storage location to another storage location. An Extract Tags instruction fetches each word from an operand in main storage, extracts the tag bits, compresses the tag bits to one tag bit per quadword, and stores the tag bits in main storage as data. An Insert Tags instruction fetches the tag bits stored in main storage as data, expands the tag bits to one tag bit per word, and inserts them on each associated word of an operand in main storage.
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公开(公告)号：IT7926079D0
公开(公告)日：1979-09-28
申请号：IT2607979
申请日：1979-09-28
Applicant: IBM
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