Table E–20: OpenVMS Alpha and DIGITAL UNIX Performance Monitoring Functions

Function

Register Usage

Comments

 

 

 

 

 

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

 

 

Waivers and Implementation-Dependent Functionality E–27

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Image 355
Compaq ECQD2KCTE manual Enable and write selected counters