cycleh

High-half cycle counter for RDCYCLE Instruction

Alias for M-mode CSR mcycleh.

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

mcounteren.CY	scounteren.CY	hcounteren.CY	cycle 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.CY

scounteren.CY

hcounteren.CY

cycle 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	0xc80
Defining extension	Zicntr, version >= Zicntr@2.0.0
Length	32-bit
Privilege Mode	U

CSR Address

0xc80

Defining extension

Zicntr, version >= Zicntr@2.0.0

Length

32-bit

Privilege Mode

Format

Figure 1. cycleh format

Field Summary

Name Location Type Reset Value

Name	Location	Type	Reset Value
`COUNT`	31:0	RO-H	UNDEFINED_LEGAL

COUNT

31:0

RO-H

UNDEFINED_LEGAL

Fields

`COUNT`

Location: cycleh[31:0]
Description: Alias of mcycleh.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.CY;CSR[mcounteren].CY%% == 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.CY;CSR[mcounteren].CY%% & %%LINK%csr_field;scounteren.CY;CSR[scounteren].CY%%) == 1'b0) {
      %%LINK%func;raise;raise%%(ExceptionCode::IllegalInstruction, %%LINK%func;mode;mode%%(), $encoding);
    }
  } else if (%%LINK%csr_field;mcounteren.CY;CSR[mcounteren].CY%% == 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.CY;CSR[hcounteren].CY%% == 1'b0 && %%LINK%csr_field;mcounteren.CY;CSR[mcounteren].CY%% == 1'b1) {
    %%LINK%func;raise;raise%%(ExceptionCode::VirtualInstruction, %%LINK%func;mode;mode%%(), $encoding);
  } else if (%%LINK%csr_field;mcounteren.CY;CSR[mcounteren].CY%% == 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.CY;CSR[hcounteren].CY%% & %%LINK%csr_field;scounteren.CY;CSR[scounteren].CY%%) == 1'b0) && (%%LINK%csr_field;mcounteren.CY;CSR[mcounteren].CY%% == 1'b1 {
    %%LINK%func;raise;raise%%(ExceptionCode::VirtualInstruction, %%LINK%func;mode;mode%%(), $encoding);
  } else if (%%LINK%csr_field;mcounteren.CY;CSR[mcounteren].CY%% == 1'b0) {
    %%LINK%func;raise;raise%%(ExceptionCode::IllegalInstruction, %%LINK%func;mode;mode%%(), $encoding);
  }
}
return %%LINK%func;read_mcycle;read_mcycle%%()[63:32];

if (%%LINK%func;mode;mode%%() == PrivilegeMode::S) {
  if (%%LINK%csr_field;mcounteren.CY;CSR[mcounteren].CY%% == 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.CY;CSR[mcounteren].CY%% & %%LINK%csr_field;scounteren.CY;CSR[scounteren].CY%%) == 1'b0) {
      %%LINK%func;raise;raise%%(ExceptionCode::IllegalInstruction, %%LINK%func;mode;mode%%(), $encoding);
    }
  } else if (%%LINK%csr_field;mcounteren.CY;CSR[mcounteren].CY%% == 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.CY;CSR[hcounteren].CY%% == 1'b0 && %%LINK%csr_field;mcounteren.CY;CSR[mcounteren].CY%% == 1'b1) {
    %%LINK%func;raise;raise%%(ExceptionCode::VirtualInstruction, %%LINK%func;mode;mode%%(), $encoding);
  } else if (%%LINK%csr_field;mcounteren.CY;CSR[mcounteren].CY%% == 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.CY;CSR[hcounteren].CY%% & %%LINK%csr_field;scounteren.CY;CSR[scounteren].CY%%) == 1'b0) && (%%LINK%csr_field;mcounteren.CY;CSR[mcounteren].CY%% == 1'b1 {
    %%LINK%func;raise;raise%%(ExceptionCode::VirtualInstruction, %%LINK%func;mode;mode%%(), $encoding);
  } else if (%%LINK%csr_field;mcounteren.CY;CSR[mcounteren].CY%% == 1'b0) {
    %%LINK%func;raise;raise%%(ExceptionCode::IllegalInstruction, %%LINK%func;mode;mode%%(), $encoding);
  }
}
return %%LINK%func;read_mcycle;read_mcycle%%()[63:32];