diff options
Diffstat (limited to 'kernel/uart.c')
| -rw-r--r-- | kernel/uart.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/kernel/uart.c b/kernel/uart.c index b8dd664..ba66237 100644 --- a/kernel/uart.c +++ b/kernel/uart.c @@ -43,6 +43,7 @@ uartinit(void) *R(1) = 0x01; } +// write one output character to the UART. void uartputc(int c) { @@ -52,6 +53,8 @@ uartputc(int c) *R(0) = c; } +// read one input character from the UART. +// return -1 if none is waiting. int uartgetc(void) { @@ -63,6 +66,7 @@ uartgetc(void) } } +// trap.c calls here when the uart interrupts. void uartintr(void) { |