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dkegel-fastly
8135be4e90
TODO: Remove the go.mod/go.sum in internal/tools once doing so doesn't break CI (e.g. once we drop support for go 1.19) * builder/cc1as.h: fix typo found by 'make spell' * GNUmakefile: remove exception for inbetween, fix instance now found by 'make spell' * GNUmakefile: remove exception for programmmer, fix instance now found by 'make spell' * go.mod: use updated misspell. GNUmakefile: add spellfix target, use it. * ignore directories properly when invoking spellchecker. * make spell: give internal/tools its own go.mod, as misspell requires newer go * make lint: depend on tools and run the installed revive (which was perhaps implied by the change that added revive to internal/tools, but not required in GNUmakefile until we gave internal/tools its own temporary go.mod) * .github: now that 'make spell' works well, run it from CI * GNUmakefile: make spell now aborts if it finds misspelt words, so what it finds doesn't get lost in CI logs * GNUmakefile: tools: avoid -C option on go generate to make test-llvm15-go119 circleci job happy, see https://cs.opensource.google/go/go/+/2af48cbb7d85e5fdc635e75b99f949010c607786 * internal/tools/go.mod: fix format of go version to leave out patchlevel, else go complains.
46 lines
1.3 KiB
Go
46 lines
1.3 KiB
Go
//go:build avr
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package interrupt
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import "device"
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// State represents the previous global interrupt state.
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type State uint8
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// Disable disables all interrupts and returns the previous interrupt state. It
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// can be used in a critical section like this:
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//
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// state := interrupt.Disable()
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// // critical section
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// interrupt.Restore(state)
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//
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// Critical sections can be nested. Make sure to call Restore in the same order
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// as you called Disable (this happens naturally with the pattern above).
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func Disable() (state State) {
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// SREG is at I/O address 0x3f.
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return State(device.AsmFull(`
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in {}, 0x3f
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cli
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`, nil))
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}
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// Restore restores interrupts to what they were before. Give the previous state
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// returned by Disable as a parameter. If interrupts were disabled before
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// calling Disable, this will not re-enable interrupts, allowing for nested
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// critical sections.
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func Restore(state State) {
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// SREG is at I/O address 0x3f.
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device.AsmFull("out 0x3f, {state}", map[string]interface{}{
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"state": state,
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})
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}
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// In returns whether the system is currently in an interrupt.
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//
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// Warning: this always returns false on AVR, as there does not appear to be a
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// reliable way to determine whether we're currently running inside an interrupt
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// handler.
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func In() bool {
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return false
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}
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