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Waivers and Implementation-Dependent Functionality E–15
Write the counters
DIGITAL UNIX
Input: a0 = 6 Function code value
a1 = arg Argument from Table E–12
Output: v0 = 1 Success
v0 = 0 Failure (not generated)
OpenVMS Alpha
Input: R16 = 6 Function code value
R17 = arg Argument from Table E–12
Output: R0 = 1 Success
R0 = 0 Failure (not generated)
Table E–5: 21164/21164PC Enable Counters for OpenVMS Alpha and DIGITAL
UNIX
Bits Meaning When Set
2 Operate on counter 2
1 Operate on counter 1
0 Operate on counter 0
Table E–6: 21164/21164PC Disable Counters for OpenVMS Alpha and DIGITAL
UNIX
Bits Meaning When Set
2 Operate on counter 2
1 Operate on counter 1
0 Operate on counter 0
Table E–4: OpenVMS Alpha and DIGITAL UNIX Performance Monitoring
Functions (Continued)
Function Register Usage Comments