github.com/tinygo-org/tinygo@v0.31.3-0.20240404173401-90b0bf646c27/src/runtime/interrupt/interrupt_xtensa.go (about)

     1  //go:build xtensa
     2  
     3  package interrupt
     4  
     5  import "device"
     6  
     7  // State represents the previous global interrupt state.
     8  type State uintptr
     9  
    10  // Disable disables all interrupts and returns the previous interrupt state. It
    11  // can be used in a critical section like this:
    12  //
    13  //	state := interrupt.Disable()
    14  //	// critical section
    15  //	interrupt.Restore(state)
    16  //
    17  // Critical sections can be nested. Make sure to call Restore in the same order
    18  // as you called Disable (this happens naturally with the pattern above).
    19  func Disable() (state State) {
    20  	return State(device.AsmFull("rsil {}, 15", nil))
    21  }
    22  
    23  // Restore restores interrupts to what they were before. Give the previous state
    24  // returned by Disable as a parameter. If interrupts were disabled before
    25  // calling Disable, this will not re-enable interrupts, allowing for nested
    26  // cricital sections.
    27  func Restore(state State) {
    28  	device.AsmFull("wsr {state}, PS", map[string]interface{}{
    29  		"state": state,
    30  	})
    31  }
    32  
    33  // In returns whether the system is currently in an interrupt.
    34  //
    35  // Warning: interrupts have not been implemented for Xtensa yet so this always
    36  // returns false.
    37  func In() bool {
    38  	return false
    39  }