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//go:build xtensa
// +build xtensa
package interrupt
import "device"
// State represents the previous global interrupt state.
type State uintptr
// Disable disables all interrupts and returns the previous interrupt state. It
// can be used in a critical section like this:
//
// state := interrupt.Disable()
// // critical section
// interrupt.Restore(state)
//
// Critical sections can be nested. Make sure to call Restore in the same order
// as you called Disable (this happens naturally with the pattern above).
func Disable() (state State) {
return State(device.AsmFull("rsil {}, 15", nil))
}
// Restore restores interrupts to what they were before. Give the previous state
// returned by Disable as a parameter. If interrupts were disabled before
// calling Disable, this will not re-enable interrupts, allowing for nested
// cricital sections.
func Restore(state State) {
device.AsmFull("wsr {state}, PS", map[string]interface{}{
"state": state,
})
}
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