82 строки
1,3 КиБ
Go
82 строки
1,3 КиБ
Go
//go:build cortexm && qemu
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// +build cortexm,qemu
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package runtime
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// This file implements the Stellaris LM3S6965 Cortex-M3 chip as implemented by
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// QEMU.
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import (
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"device/arm"
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"runtime/volatile"
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"unsafe"
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)
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type timeUnit int64
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var timestamp timeUnit
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//export Reset_Handler
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func main() {
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preinit()
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run()
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// Signal successful exit.
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exit(0)
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}
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func ticksToNanoseconds(ticks timeUnit) int64 {
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return int64(ticks)
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}
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func nanosecondsToTicks(ns int64) timeUnit {
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return timeUnit(ns)
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}
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func sleepTicks(d timeUnit) {
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// TODO: actually sleep here for the given time.
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timestamp += d
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}
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func ticks() timeUnit {
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return timestamp
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}
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// UART0 output register.
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var stdoutWrite = (*volatile.Register8)(unsafe.Pointer(uintptr(0x4000c000)))
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func putchar(c byte) {
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stdoutWrite.Set(uint8(c))
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}
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func getchar() byte {
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// dummy, TODO
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return 0
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}
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func buffered() int {
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// dummy, TODO
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return 0
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}
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func waitForEvents() {
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arm.Asm("wfe")
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}
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func abort() {
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exit(1)
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}
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func exit(code int) {
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// Exit QEMU.
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if code == 0 {
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arm.SemihostingCall(arm.SemihostingReportException, arm.SemihostingApplicationExit)
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} else {
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arm.SemihostingCall(arm.SemihostingReportException, arm.SemihostingRunTimeErrorUnknown)
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}
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// Lock up forever (should be unreachable).
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for {
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arm.Asm("wfi")
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}
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}
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