mhpmcounter15

Machine Hardware Performance Counter 15

Programmable hardware performance counter.

Attributes

Requirement

Smhpm

Defining extensions

Smhpm

M-mode programmable hardware performance counters

CSR Address

0xb0f

Length

64-bit

Privilege Mode

M

Format

mhpmcounter15 format
Figure 1. mhpmcounter15 format

Field Summary

Name Location Type Reset Value

mhpmcounter15.COUNT

63:0

[when,"HPM_COUNTER_EN[15]"] RW-H

[when,"!(HPM_COUNTER_EN[15])"] RO

UNDEFINED_LEGAL

Fields

COUNT

Location

63:0

Description

Performance counter for event selected in mhpmevent15.EVENT.

Increments every time event occurs unless:

  • mcountinhibit.HPM15 <%- if ext?(:Smcdeleg) -%>or its alias scountinhibit.HPM15<%- end -%> is set <%- if ext?(:Sscofpmf) -%>

  • mhpmevent15.MINH is set and the current privilege level is M <%- if ext?(:S) -%>

  • mhpmevent15.SINH <%- if ext?(:Ssccfg) -%>or its alias hpmevent15..SINH<%- end -%> is set and the current privilege level is (H)S <%- end -%> <%- if ext?(:U) -%>

  • mhpmevent15.UINH <%- if ext?(:Ssccfg) -%>or its alias hpmevent15.SINH<%- end -%> is set and the current privilege level is U <%- end -%> <%- if ext?(:H) -%>

  • mhpmevent15.VSINH <%- if ext?(:Ssccfg) -%>or its alias hpmevent15.SINH<%- end -%> is set and the current privilege level is VS

  • mhpmevent15.VUINH <%- if ext?(:Ssccfg) -%>or its alias hpmevent15.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

Software read

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

if (HPM_COUNTER_EN[15]) {
  return read_hpm_counter(15);
} else {
  return 0;
}