hpmcounter21

User-mode Hardware Performance Counter 18

Alias for M-mode CSR mhpmcounter21.

Privilege mode access is controlled with mcounteren.HPM21 , scounteren.HPM21 , and hcounteren.HPM21 as follows:

mcounteren.HPM21	scounteren.HPM21	hcounteren.HPM21	hpmcounter21 behavior
S-mode	U-mode	VS-mode	VU-mode
0	-	-	`IllegalInstruction`	`IllegalInstruction`	`IllegalInstruction`	`IllegalInstruction`
1	0	0	read-only	`IllegalInstruction`	`VirtualInstruction`	`VirtualInstruction`
1	1	0	read-only	read-only	`VirtualInstruction`	`VirtualInstruction`
1	0	1	read-only	`IllegalInstruction`	read-only	`VirtualInstruction`
1	1	1	read-only	read-only	read-only	read-only

mcounteren.HPM21

scounteren.HPM21

hcounteren.HPM21

hpmcounter21 behavior

S-mode

U-mode

VS-mode

VU-mode

IllegalInstruction

read-only

IllegalInstruction

VirtualInstruction

read-only

VirtualInstruction

read-only

IllegalInstruction

read-only

VirtualInstruction

read-only

Attributes

CSR Address	0xc15
Defining extension	Zihpm, version >= Zihpm@2.0.0
Length	64-bit
Privilege Mode	U

CSR Address

0xc15

Defining extension

Zihpm, version >= Zihpm@2.0.0

Length

64-bit

Privilege Mode

Format

Figure 1. hpmcounter21 format

Field Summary

Name Location Type Reset Value

Name	Location	Type	Reset Value
`COUNT`	63:0	RO-H	UNDEFINED_LEGAL

COUNT

63:0

RO-H

UNDEFINED_LEGAL

Fields

`COUNT`

Location: hpmcounter21[63:0]
Description: Alias of mhpmcounter21.COUNT.
Type

RO-H	Read-Only with Hardware update Writes are ignored. Reads reflect a value dynamically generated by hardware.

Reset value: UNDEFINED_LEGAL

Software read

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

Pruned
Original

if (%%LINK%func;mode;mode%%() == PrivilegeMode::S) {
  if (%%LINK%csr_field;mcounteren.HPM21;CSR[mcounteren].HPM21%% == 1'b0) {
    %%LINK%func;raise;raise%%(ExceptionCode::IllegalInstruction, %%LINK%func;mode;mode%%(), $encoding);
  }
} else if (%%LINK%func;mode;mode%%() == PrivilegeMode::U) {
  if (%%LINK%csr_field;misa.S;CSR[misa].S%% == 1'b1) {
    if ((%%LINK%csr_field;mcounteren.HPM21;CSR[mcounteren].HPM21%% & %%LINK%csr_field;scounteren.HPM21;CSR[scounteren].HPM21%%) == 1'b0) {
      %%LINK%func;raise;raise%%(ExceptionCode::IllegalInstruction, %%LINK%func;mode;mode%%(), $encoding);
    }
  } else if (%%LINK%csr_field;mcounteren.HPM21;CSR[mcounteren].HPM21%% == 1'b0) {
    %%LINK%func;raise;raise%%(ExceptionCode::IllegalInstruction, %%LINK%func;mode;mode%%(), $encoding);
  }
} else if (%%LINK%func;mode;mode%%() == PrivilegeMode::VS) {
  if (%%LINK%csr_field;hcounteren.HPM21;CSR[hcounteren].HPM21%% == 1'b0 && %%LINK%csr_field;mcounteren.HPM21;CSR[mcounteren].HPM21%% == 1'b1) {
    %%LINK%func;raise;raise%%(ExceptionCode::VirtualInstruction, %%LINK%func;mode;mode%%(), $encoding);
  } else if (%%LINK%csr_field;mcounteren.HPM21;CSR[mcounteren].HPM21%% == 1'b0) {
    %%LINK%func;raise;raise%%(ExceptionCode::IllegalInstruction, %%LINK%func;mode;mode%%(), $encoding);
  }
} else if (%%LINK%func;mode;mode%%() == PrivilegeMode::VU) {
  if (%%LINK%csr_field;hcounteren.HPM21;CSR[hcounteren].HPM21%% & %%LINK%csr_field;scounteren.HPM21;CSR[scounteren].HPM21%%) == 1'b0) && (%%LINK%csr_field;mcounteren.HPM21;CSR[mcounteren].HPM21%% == 1'b1 {
    %%LINK%func;raise;raise%%(ExceptionCode::VirtualInstruction, %%LINK%func;mode;mode%%(), $encoding);
  } else if (%%LINK%csr_field;mcounteren.HPM21;CSR[mcounteren].HPM21%% == 1'b0) {
    %%LINK%func;raise;raise%%(ExceptionCode::IllegalInstruction, %%LINK%func;mode;mode%%(), $encoding);
  }
}
return %%LINK%func;read_hpm_counter;read_hpm_counter%%(21);

if (%%LINK%func;mode;mode%%() == PrivilegeMode::S) {
  if (%%LINK%csr_field;mcounteren.HPM21;CSR[mcounteren].HPM21%% == 1'b0) {
    %%LINK%func;raise;raise%%(ExceptionCode::IllegalInstruction, %%LINK%func;mode;mode%%(), $encoding);
  }
} else if (%%LINK%func;mode;mode%%() == PrivilegeMode::U) {
  if (%%LINK%csr_field;misa.S;CSR[misa].S%% == 1'b1) {
    if ((%%LINK%csr_field;mcounteren.HPM21;CSR[mcounteren].HPM21%% & %%LINK%csr_field;scounteren.HPM21;CSR[scounteren].HPM21%%) == 1'b0) {
      %%LINK%func;raise;raise%%(ExceptionCode::IllegalInstruction, %%LINK%func;mode;mode%%(), $encoding);
    }
  } else if (%%LINK%csr_field;mcounteren.HPM21;CSR[mcounteren].HPM21%% == 1'b0) {
    %%LINK%func;raise;raise%%(ExceptionCode::IllegalInstruction, %%LINK%func;mode;mode%%(), $encoding);
  }
} else if (%%LINK%func;mode;mode%%() == PrivilegeMode::VS) {
  if (%%LINK%csr_field;hcounteren.HPM21;CSR[hcounteren].HPM21%% == 1'b0 && %%LINK%csr_field;mcounteren.HPM21;CSR[mcounteren].HPM21%% == 1'b1) {
    %%LINK%func;raise;raise%%(ExceptionCode::VirtualInstruction, %%LINK%func;mode;mode%%(), $encoding);
  } else if (%%LINK%csr_field;mcounteren.HPM21;CSR[mcounteren].HPM21%% == 1'b0) {
    %%LINK%func;raise;raise%%(ExceptionCode::IllegalInstruction, %%LINK%func;mode;mode%%(), $encoding);
  }
} else if (%%LINK%func;mode;mode%%() == PrivilegeMode::VU) {
  if (%%LINK%csr_field;hcounteren.HPM21;CSR[hcounteren].HPM21%% & %%LINK%csr_field;scounteren.HPM21;CSR[scounteren].HPM21%%) == 1'b0) && (%%LINK%csr_field;mcounteren.HPM21;CSR[mcounteren].HPM21%% == 1'b1 {
    %%LINK%func;raise;raise%%(ExceptionCode::VirtualInstruction, %%LINK%func;mode;mode%%(), $encoding);
  } else if (%%LINK%csr_field;mcounteren.HPM21;CSR[mcounteren].HPM21%% == 1'b0) {
    %%LINK%func;raise;raise%%(ExceptionCode::IllegalInstruction, %%LINK%func;mode;mode%%(), $encoding);
  }
}
return %%LINK%func;read_hpm_counter;read_hpm_counter%%(21);