mhpmcounter3

Machine Hardware Performance Counter 3

Programmable hardware performance counter.

Attributes

Defining Extension

  • Smhpm, version >= 0

CSR Address

0xb03

Length

64-bit

Privilege Mode

M

Format

mhpmcounter3 format
Figure 1. mhpmcounter3 format

Field Summary

Name Location Type Reset Value

mhpmcounter3.COUNT

63:0

[when,"HPM_COUNTER_EN[3]"] RW-H

[when,"!(HPM_COUNTER_EN[3])"] RO

[when,"HPM_COUNTER_EN[3]"] UNDEFINED_LEGAL

[when,"!(HPM_COUNTER_EN[3])"] 0

Fields

COUNT

Location

63:0

Description

Performance counter for event selected in mhpmevent3.EVENT.

Increments every time event occurs unless:

  • mcountinhibit.HPM3 <%- if ext?(:Smcdeleg) -%>or its alias scountinhibit.HPM3<%- end -%> is set <%- if ext?(:Sscofpmf) -%>

  • mhpmevent3.MINH is set and the current privilege level is M <%- if ext?(:S) -%>

  • mhpmevent3.SINH <%- if ext?(:Ssccfg) -%>or its alias hpmevent3..SINH<%- end -%> is set and the current privilege level is (H)S <%- end -%> <%- if ext?(:U) -%>

  • mhpmevent3.UINH <%- if ext?(:Ssccfg) -%>or its alias hpmevent3.SINH<%- end -%> is set and the current privilege level is U <%- end -%> <%- if ext?(:H) -%>

  • mhpmevent3.VSINH <%- if ext?(:Ssccfg) -%>or its alias hpmevent3.SINH<%- end -%> is set and the current privilege level is VS

  • mhpmevent3.VUINH <%- if ext?(:Ssccfg) -%>or its alias hpmevent3.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[3]) {
  return read_hpm_counter(3);
} else {
  return 0;
}