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Waivers and Implementation-Dependent Functionality E–27
Write the counters
DIGITAL UNIX
Input: a0 = 6 Function code value
a1 = arg Argument from Table E–25
OpenVMS Alpha
Input: R16 = 6 Function code value
R17 = arg Argument from Table E–25
Enable and write selected counters
DIGITAL UNIX
Input: a0 = 7 Function code value
a1 = arg Argument from Table E–26
OpenVMS Alpha
Input: R16 = 7 Function code value
R17 = arg Argument from Table E–26
Table E–21: 21264 Enable Counters for OpenVMS Alpha and DIGITAL UNIX
R17/a1 Bits Meaning When Set
1 Set I_CTL[PCT1_EN], which enables counter 1
0 Set I_CTL[PCT0_EN], which enables counter 0
Table E–22: 21264 Disable Counters for OpenVMS Alpha and DIGITAL UNIX
R17/a1 Bits Meaning When Set
1 Clear I_CTL[PCT1_EN], which disables counter 1
0 Clear I_CTL[PCT0_EN], which disables counter 0
Table E–20: OpenVMS Alpha and DIGITAL UNIX Performance Monitoring
Functions
Function Register Usage Comments