enable_fpu

kernel::arch::riscv64::fpu

Function enable_fpu 

Source 
pub fn enable_fpu()
Expand description

Enable FPU access by setting sstatus.FS to Initial state

This must be called before user space can use floating-point instructions. The FS field in sstatus controls access to the FPU:

  • 00: Off - FPU access causes illegal instruction exception
  • 01: Initial - FPU is enabled with initial state
  • 10: Clean - FPU is enabled, state has not been modified
  • 11: Dirty - FPU is enabled, state has been modified