gopkg.in/hugelgupf/u-root.v9@v9.0.0-20180831063832-3f6f1057f09b/integration/testdata/io/uinit/io.go (about)

     1  // Copyright 2018 the u-root Authors. All rights reserved
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package main
     6  
     7  import (
     8  	"fmt"
     9  	"log"
    10  	"os"
    11  	"os/exec"
    12  )
    13  
    14  // Prints the string "UART TEST\r\n" using IO.
    15  func main() {
    16  	// Writing to the serial port is atomic in QEMU, so no polling or
    17  	// sleeping is needed between characters.
    18  	for _, b := range []byte("UART TEST\r\n") {
    19  		cmd := exec.Command("io", "outb", "0x3f8", fmt.Sprintf("%d", b))
    20  		cmd.Stdout = os.Stdout
    21  		cmd.Stderr = os.Stderr
    22  		err := cmd.Run()
    23  		if err != nil {
    24  			log.Fatal(err)
    25  		}
    26  	}
    27  }