Table E–4: OpenVMS Alpha and DIGITAL UNIX Performance Monitoring Functions (Continued)

Function Register Usage

Comments

 

 

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

 

 

 

E–14Alpha Architecture Handbook

Page 342
Image 342
Compaq ECQD2KCTE manual Select interrupt frequencies, Read the counters