RISC-V ISA Explorer · Single-Letter Extensions
U: User ISA
Ratified 2019-12 · version 1.0.0
Least privileged execution level, where application code runs isolated from the kernel and the platform.
Typical use: User privilege level (Volume II)
Open U in the explorerDependencies
Required by
Instructions (1)
| Mnemonic | Name | Encoding | Match | Mask |
|---|---|---|---|---|
URET | 00000000001000000000000001110011 | 0x200073 | 0xffffffff |
Control and status registers (4)
| Name | Address | Mode | Description |
|---|---|---|---|
mcounteren | 0x306 | M | Machine Counter Enable |
menvcfg | 0x30a | M | Machine Environment Configuration |
menvcfgh | 0x31a | M | Machine Environment Configuration |
senvcfg | 0x10a | S | Supervisor Environment Configuration |