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E–14 Alpha Architecture Handbook
Select Processor Mode options
DIGITAL UNIX
Input: a0 = 3 Function code value
a1 = arg Argument from Table E–9
Output: v0 = 1 Success
v0 = 0 Failure (not generated)
OpenVMS Alpha
Input: R16 = 3 Function code value
R17 = arg Argument from Table E–9
Output: R0 = 1 Success
R0 = 0 Failure (not generated)
Select interrupt frequencies
DIGITAL UNIX
Input: a0 = 4 Function code value
a1 = arg Argument from Table E–10
Output: v0 = 1 Success
v0 = 0 Failure (not generated)
OpenVMS Alpha
Input: R16 = 4 Function code value
R17 = arg Argument from Table E–10
Output: R0 = 1 Success
R0 = 0 Failure (not generated)
Read the counters
DIGITAL UNIX
Input: a0 = 5 Function code value
a1 = arg Argument from Table E–11
Output: v0 = val Return value from Table E–11
OpenVMS Alpha
Input: R16 = 5 Function code value
R17 = arg Argument from Table E–11
Output: R0 = val Return value from Table E–11
Table E–4: OpenVMS Alpha and DIGITAL UNIX Performance Monitoring
Functions (Continued)
Function Register Usage Comments