arch/mips/qemu/q-console.c

   1 #include <linux/console.h>
   2 #include <linux/init.h>
   3 #include <linux/serial_reg.h>
   4 #include <asm/io.h>
   5
   6 #define PORT(offset) (0x3f8 + (offset))
   7
   8 static inline unsigned int serial_in(int offset)
   9 {
  10         return inb(PORT(offset));
  11 }
  12
  13 static inline void serial_out(int offset, int value)
  14 {
  15         outb(value, PORT(offset));
  16 }
  17
  18 int prom_putchar(char c)
  19 {
  20         while ((serial_in(UART_LSR) & UART_LSR_THRE) == 0)
  21                 ;
  22
  23         serial_out(UART_TX, c);
  24
  25         return 1;
  26 }