Intel ITANIUM ARCHITECTURE - SOFTWARE DEVELOPERS MANUAL VOLUME 1 REV 2.3 Manual page 542

• state
directed PAL to skip some self-tests by modifying the self-test control word, failures
related to these self-tests will not be reflected in this state.
Table 11-6.
Catastrophic Failure
Healthy
Performance Restricted
Functionally Restricted
To further qualify FUNCTIONALLY RESTRICTED, the following requirements will be
met:
• The processor has detected and isolated the failing component so that it will not
be used.
• The processor must have at least one functioning memory unit, ALU, shifter,
and branch unit.
• The floating-point unit may be disabled.
• The RSE is not required to work, but register renaming logic must work
properly.
• The paths between the processor controlled caches and the register files have
been shown to work. The path between the processor caches and memory
cannot be validated until phase two of the processor self-test invoked by the
PAL_TEST_PROC procedure.
• Loads and stores to firmware address space must work correctly.
Additional information about the failure can be obtained by examining the
test_status field of the Self Test State Parameter.
For the case of FUNCTIONALLY RESTRICTED, it is required that higher level
firmware or OS not use failing functional units during their execution. PAL will not
prevent failing functional units from being used.
• te A 1-bit field indicating whether testing has occurred. If this field is zero, the
–
processor has not been tested, and no other fields in the Self Test State Parameter
are valid. The processor can be tested prior to entering SALE_ENTRY for both
RECOVERY CHECK and RESET functions.
If the state field indicates that the processor is functionally restricted, then the
fields vm, ia & fp specify additional information about the functional failure.
• vm
available
• ia
• fp
• mf
than vm, ia, or fp. The test_status field provides additional information about
this failure on an implementation-specific basis.
2:294
A 2-bit field indicating the state of the processor after self-test. If SAL
–
state Field Values
State Value
N/A
00
01
10
a 1-bit field, if set to 1, indicating that virtual memory features are not
–
a 1-bit field, if set to 1, indicating that IA-32 execution is not available
–
a 1-bit field, if set to 1, indicating that floating-point unit is not available
–
a 1-bit field, if set to 1, indicating miscellaneous functional failure other
–
Description
The processor is not capable of continuing. In this case it does not
branch to SALE_ENTRY.
No hardware failures have occurred in testing that would affect either
the performance or functionality of the processor.
A hardware failure has occurred in testing that does not affect the
functionality of the processor, but performance may be degraded.
A hardware failure has occurred in testing that affects the
functionality of the processor, but firmware code can still be run. The
processor may also be performance restricted.
Volume 2, Part 1: Processor Abstraction Layer