//go:build arm7tdmi && !mgbadebug

package runtime

import (
	_ "runtime/interrupt" // make sure the interrupt handler is defined
	"unsafe"
)

func putchar(c byte) {
	// dummy, TODO
}

func getchar() byte {
	// dummy, TODO
	return 0
}

func buffered() int {
	// dummy, TODO
	return 0
}

//go:extern _sbss
var _sbss [0]byte

//go:extern _ebss
var _ebss [0]byte

//go:extern _sdata
var _sdata [0]byte

//go:extern _sidata
var _sidata [0]byte

//go:extern _edata
var _edata [0]byte

const zeroSizeAllocPtr uintptr = 16 // points somewhere in the BIOS which is not readable

// Entry point for Go. Initialize all packages and call main.main().
//
//export main
func main() {
	// Initialize .data and .bss sections.
	preinit()

	// Run program.
	run()
}

func preinit() {
	// Initialize .bss: zero-initialized global variables.
	ptr := unsafe.Pointer(&_sbss)
	for ptr != unsafe.Pointer(&_ebss) {
		*(*uint32)(ptr) = 0
		ptr = unsafe.Add(ptr, 4)
	}

	// Initialize .data: global variables initialized from flash.
	src := unsafe.Pointer(&_sidata)
	dst := unsafe.Pointer(&_sdata)
	for dst != unsafe.Pointer(&_edata) {
		*(*uint32)(dst) = *(*uint32)(src)
		dst = unsafe.Add(dst, 4)
		src = unsafe.Add(src, 4)
	}
}

func ticksToNanoseconds(ticks timeUnit) int64 {
	return int64(ticks)
}

func nanosecondsToTicks(ns int64) timeUnit {
	return timeUnit(ns)
}

func ticks() timeUnit {
	// TODO
	return 0
}

func sleepTicks(d timeUnit) {
	// TODO
}

func exit(code int) {
	abort()
}

func abort() {
	// TODO
	for {
	}
}
