mhpmcounter20

Machine Hardware Performance Counter 20

Programmable hardware performance counter.

Attributes

Defining Extension

  • Smhpm, version >= 0

CSR Address

0xb14

Length

64-bit

Privilege Mode

M

Format

mhpmcounter20 format
Figure 1. mhpmcounter20 format

Field Summary

Name Location Type Reset Value

mhpmcounter20.COUNT

63:0

[when,"HPM_COUNTER_EN[20]"] RW-H

[when,"!(HPM_COUNTER_EN[20])"] RO

[when,"HPM_COUNTER_EN[20]"] UNDEFINED_LEGAL

[when,"!(HPM_COUNTER_EN[20])"] 0

Fields

COUNT

Location

63:0

Description

Performance counter for event selected in mhpmevent20.EVENT.

Increments every time event occurs unless:

  • mcountinhibit.HPM20 <%- if ext?(:Smcdeleg) -%>or its alias scountinhibit.HPM20<%- end -%> is set <%- if ext?(:Sscofpmf) -%>

  • mhpmevent20.MINH is set and the current privilege level is M <%- if ext?(:S) -%>

  • mhpmevent20.SINH <%- if ext?(:Ssccfg) -%>or its alias hpmevent20..SINH<%- end -%> is set and the current privilege level is (H)S <%- end -%> <%- if ext?(:U) -%>

  • mhpmevent20.UINH <%- if ext?(:Ssccfg) -%>or its alias hpmevent20.SINH<%- end -%> is set and the current privilege level is U <%- end -%> <%- if ext?(:H) -%>

  • mhpmevent20.VSINH <%- if ext?(:Ssccfg) -%>or its alias hpmevent20.SINH<%- end -%> is set and the current privilege level is VS

  • mhpmevent20.VUINH <%- if ext?(:Ssccfg) -%>or its alias hpmevent20.SINH<%- end -%> is set and the current privilege level is VU <%- end -%> <%- end -%>

Unimplemented performance counter. Must be read-only 0 (access does not cause trap).

Type
RW-H
RO
Reset value
UNDEFINED_LEGAL
0

Software read

This CSR may return a value that is different from what is stored in hardware.

if (HPM_COUNTER_EN[20]) {
  return read_hpm_counter(20);
} else {
  return 0;
}