mstatush

Machine Status High

The mstatus register tracks and controls the hart’s current operating state.

Attributes

Defining Extension

* Sm, version >= 1.12

CSR Address

0x310

Length

32-bit

Privilege Mode

M

Format

mstatush format

Figure 1. mstatush format

Field Summary

Name Location Type Reset Value

7

RW-H

UNDEFINED_LEGAL

6

RW-H

0

5

RW

RO

1

0

4

RW

RO

0

1

UNDEFINED_LEGAL

Fields

`MPV`

Location: 7
Description: Machine Previous Virtualization mode

Written with the prior virtualization mode when entering M-mode from an exception/interrupt.
When returning via an MRET instruction, the virtualization mode becomes the value of MPV unless MPP=3, in which case the virtualization mode is always 0.
Can also be written by software.
Type: RW-H
Reset value: UNDEFINED_LEGAL

`GVA`

Location: 6
Description: Guest Virtual Address

When a trap is taken and a guest virtual address is written into mtval, GVA is set.
When a trap is taken and a guest virtual address is written into mtval, GVA is cleared.
Type: RW-H
Reset value: 0

`MBE`

Location: 5
Description: see mstatus.MBE
Type

RW

RO

Reset value

1

0

`SBE`

Location: 4
Description: see mstatus.SBE
Type

RW

RO

Reset value

0

1

UNDEFINED_LEGAL