iAPX 432 Interface Processor Architecture Reference Manual
NULL AOCESS DESCRIPTOR
Operator ID: 8 .
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| Hex Byte |
Contents | Function Request Facility | Offset | |||
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| 1 |
| ||
results 0 through 9 | 1 | reserved | 1 | ||
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| 1 |
| ||
operand 6 | 1 | reserved | 1 | 1EH | |
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| 1 |
| ||
operand S | 1 | reserved |
| lCH | |
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| 1 |
| ||
operand 4 | 1 | reserved | 1 | 1AH | |
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| 1 |
| ||
operand 3 | 1 | reserved | ! | l8H | |
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| 1 |
| ||
operand 2 | ! | reserved |
| l6H | |
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| 1 |
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operand 1 | 1 | reserved |
| 14H | |
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| 1 |
| ||
operand OLDEST ~ SELECTOR | 1 | l2H | |||
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| 1 |
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IP function code | 1 | OOSH (NULL ACCESS | 1 | lOH | |
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| 1 | DFSCRIPTCR) | 1 | |
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| 1 |
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function | state | 1 | reserved | 1 | OEH |
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| 1 |
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process selection | index | 1 PRC:CESS INDEX | 1 | OCH | |
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| 1 |
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NULL AOCESS DESCRIPl'CR allCMs an operation to overwrite and thus logically clear a given access descriptor entry. At the same time, access to any object previously available via that access descriptor entry is given up. The operand contains the object selector for the destination access segment entry.
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