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 #include <asm/setup.h>
  13
  14 /*
  15  * Emit one character to the boot console.
  16  */
  17 void prom_putchar(char c)
  18 {
  19         kvm_hypercall3(KVM_HC_MIPS_CONSOLE_OUTPUT, 0 /*  port 0 */,
  20                 (unsigned long)&c, 1 /* len == 1 */);
  21 }
  22
  23 #ifdef CONFIG_VIRTIO_CONSOLE
  24 static int paravirt_put_chars(u32 vtermno, const char *buf, int count)
  25 {
  26         kvm_hypercall3(KVM_HC_MIPS_CONSOLE_OUTPUT, vtermno,
  27                 (unsigned long)buf, count);
  28
  29         return count;
  30 }
  31
  32 static int __init paravirt_cons_init(void)
  33 {
  34         virtio_cons_early_init(paravirt_put_chars);
  35         return 0;
  36 }
  37 core_initcall(paravirt_cons_init);
  38
  39 #endif