coreboot-kgpe-d16/util/romcc/tests/simple_test15.c

48 lines
822 B
C

static void outb(unsigned char value, unsigned short port)
{
__builtin_outb(value, port);
}
static unsigned char inb(unsigned short port)
{
return __builtin_inb(port);
}
static int uart_can_tx_byte(void)
{
return inb(0x3f8 + 0x05) & 0x20;
}
static void uart_wait_to_tx_byte(void)
{
while(!uart_can_tx_byte())
;
}
static void uart_wait_until_sent(void)
{
while(!(inb(0x3f8 + 0x05) & 0x40))
;
}
static void uart_tx_byte(unsigned char data)
{
uart_wait_to_tx_byte();
outb(data, 0x3f8 + 0x00);
uart_wait_until_sent();
}
static void print_debug(const char *str)
{
unsigned char ch;
while((ch = *str++) != '\0') {
uart_tx_byte(ch);
}
}
static void main(void)
{
print_debug("one\r\n");
print_debug("two\r\n");
}