acrn-kernel/arch/mips/qemu/q-console.c

27 lines
433 B
C

#include <linux/console.h>
#include <linux/init.h>
#include <linux/serial_reg.h>
#include <asm/io.h>
#define PORT(offset) (0x3f8 + (offset))
static inline unsigned int serial_in(int offset)
{
return inb(PORT(offset));
}
static inline void serial_out(int offset, int value)
{
outb(value, PORT(offset));
}
int prom_putchar(char c)
{
while ((serial_in(UART_LSR) & UART_LSR_THRE) == 0)
;
serial_out(UART_TX, c);
return 1;
}