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Chapter 11. Machine .. Check Handling
Contents
Machine-Check Detection
11-1
11-2
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11-2
11-3
11-3
Invalid CBC in Page Descriptions
11-3
Invalid eBC in Registers
11-4
11-4
11-5
11-5
11-5
Interruption Action
11-6
11-7
Machine,..Check-Interruption Code
11-8
11-8
11-9
Timing,..Facility Damage
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11-10
11-9
11-7
11-8
The machine-check-handling mechanism provides
extensive equipment-malfunction detection to
ensure the integrity of system operation and to
permit automatic recovery from some malfunctions.
Equipment· malfunctions' and certain external
disturbances. are. reported by means of a machine-
check interruption to assist in program-damage
assessment and recovery. The interruption supplles
the program with information about the extent of
the damage and the location and nature of the
cause. Equipment malfunctions, . errors, and other
situations which can cause machine-check
interruptions.are referred to as machine checks.
11-10
11-10
11-10
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11-10
PSW Mask and Key Validity
11-10
11-10
11-11
CPU-Timer Validity
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11-11
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11-12
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11-11
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11-12
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Machine-Check Detection
Machine-check-detection mechanisms may take
many forms, especially in control functions for
arithmetic and logical processing, addressing,
sequencing, and execution. For program-
addressable information, detection is normally
accomplished by encoding redundancy into the
information in such a manner that most failures in
the retention or transmission of the information
result in an invalid code. The encoding normally
takes the form of. one or more redundant bits,
called check bits,appended to a group of data bits.
Chapter 11. Machine.,.Check Handling
11-1
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