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Table
Bits | Name | Meaning |
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MODE_SELECT1 | Select modes in which to count: | ||
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| Value | Meaning |
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| 0 | Count all modes |
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| 1 | Count PALmode only |
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| 2 | Count all modes except PALmode |
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| 3 | Count only user mode |
PCSEL1 | Counter 1 selection. See Table | ||
PCSEL2 | Counter 2 selection. See Table | ||
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1Windows NT Alpha uses bits 30 and
E.2.2.3 OpenVMS Alpha and DIGITAL UNIX Functions and Arguments
The functions execute only on a single (the current running) processor and are described in Table
The OpenVMS Alpha MTPR_PERFMON instruction is called with a function code in R16, a
The DIGITAL UNIX wrperfmon instruction is called with a function code in a0, a function specific argument in a1, and status is returned in v0.
Table
Function Register Usage | Comments | |
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Enable performance monitoring; do not reset counters | ||
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DIGITAL UNIX |
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Input: | a0 = 1 | Function code value |
| a1 = arg | Argument from Table |
Output: | v0 = 1 | Success |
| v0 = 0 | Failure (not generated) |
OpenVMS Alpha |
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Input: | R16 = 1 | Function code value |
| R17 = arg | Argument from Table |
Output: | R0 = 1 | Success |
| R0 = 0 | Failure (not generated) |
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