arch/mips/paravirt/serial.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 2013 Cavium, Inc.
   7  */
   8
   9 #include <linux/kernel.h>
  10 #include <linux/virtio_console.h>
  11 #include <linux/kvm_para.h>
  12
  13 /*
  14  * Emit one character to the boot console.
  15  */
  16 int prom_putchar(char c)
  17 {
  18         kvm_hypercall3(KVM_HC_MIPS_CONSOLE_OUTPUT, 0 /*  port 0 */,
  19                 (unsigned long)&c, 1 /* len == 1 */);
  20
  21         return 1;
  22 }
  23
  24 #ifdef CONFIG_VIRTIO_CONSOLE
  25 static int paravirt_put_chars(u32 vtermno, const char *buf, int count)
  26 {
  27         kvm_hypercall3(KVM_HC_MIPS_CONSOLE_OUTPUT, vtermno,
  28                 (unsigned long)buf, count);
  29
  30         return count;
  31 }
  32
  33 static int __init paravirt_cons_init(void)
  34 {
  35         virtio_cons_early_init(paravirt_put_chars);
  36         return 0;
  37 }
  38 core_initcall(paravirt_cons_init);
  39
  40 #endif