diff options
Diffstat (limited to 'src/lib')
| -rw-r--r-- | src/lib/uart8250.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/src/lib/uart8250.c b/src/lib/uart8250.c index 67b0a95cfb..e3a1255dc6 100644 --- a/src/lib/uart8250.c +++ b/src/lib/uart8250.c @@ -20,7 +20,7 @@ #define UART_MSR 0x06 #define UART_SCR 0x07 -static inline int uart8250_can_tx_byte(unsigned base_port) +static int uart8250_can_tx_byte(unsigned base_port) { return inb(base_port + UART_LSR) & 0x20; } @@ -45,6 +45,18 @@ void uart8250_tx_byte(unsigned base_port, unsigned char data) uart8250_wait_until_sent(base_port); } +int uart8250_can_rx_byte(unsigned base_port) +{ + return inb(base_port + UART_LSR) & 0x01; +} + +unsigned char uart8250_rx_byte(unsigned base_port) +{ + while(!uart8250_can_rx_byte(base_port)) + ; + return inb(base_port + UART_RBR); +} + void uart8250_init(unsigned base_port, unsigned divisor, unsigned lcs) { lcs &= 0x7f; |