src/drivers/emulation/qemu/qemu_debugcon.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <console/console.h>
   4 #include <console/qemu_debugcon.h>
   5 #include <arch/io.h>
   6
   7 static int qemu_debugcon_detected;
   8
   9 void qemu_debugcon_init(void)
  10 {
  11         int detected = (inb(CONFIG_CONSOLE_QEMU_DEBUGCON_PORT) == 0xe9);
  12         qemu_debugcon_detected = detected;
  13         printk(BIOS_INFO, "QEMU debugcon %s [port 0x%x]\n",
  14                detected ? "detected" : "not found",
  15                CONFIG_CONSOLE_QEMU_DEBUGCON_PORT);
  16 }
  17
  18 void qemu_debugcon_tx_byte(unsigned char data)
  19 {
  20         if (qemu_debugcon_detected != 0)
  21                 outb(data, CONFIG_CONSOLE_QEMU_DEBUGCON_PORT);
  22 }