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https://github.com/tinygo-org/tinygo.git
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Ayke van Laethem
184827e4d8
QEMU doesn't support the RTC peripheral yet so work around it for now.
This makes the following command work:
tinygo run -target=hifive1-qemu ./testdata/coroutines.go
40 lines
774 B
Go
40 lines
774 B
Go
// +build fe310,!qemu
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package runtime
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import (
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"device/riscv"
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"device/sifive"
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)
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func abort() {
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// lock up forever
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for {
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riscv.Asm("wfi")
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}
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}
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func ticks() timeUnit {
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// Combining the low bits and the high bits yields a time span of over 270
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// years without counter rollover.
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highBits := sifive.RTC.RTCHI.Get()
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for {
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lowBits := sifive.RTC.RTCLO.Get()
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newHighBits := sifive.RTC.RTCHI.Get()
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if newHighBits == highBits {
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// High bits stayed the same.
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println("bits:", highBits, lowBits)
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return timeUnit(lowBits) | (timeUnit(highBits) << 32)
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}
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// Retry, because there was a rollover in the low bits (happening every
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// 1.5 days).
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highBits = newHighBits
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}
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}
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func sleepTicks(d timeUnit) {
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target := ticks() + d
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for ticks() < target {
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}
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}
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