diff options
| author | Ada Christine <adachristine18@gmail.com> | 2021-12-19 22:41:15 +0000 |
|---|---|---|
| committer | Ada Christine <adachristine18@gmail.com> | 2021-12-19 22:41:15 +0000 |
| commit | e303a03e7c96bc5bf7fa93f7b46ce63196893d7a (patch) | |
| tree | f187b374feec85015d6df1f94db618a3f5cc893f /kernel/serial.c | |
| parent | bff63a4337eb3388617d230970c5eb2684d6a215 (diff) | |
moving files around
Diffstat (limited to 'kernel/serial.c')
| -rw-r--r-- | kernel/serial.c | 41 |
1 files changed, 0 insertions, 41 deletions
diff --git a/kernel/serial.c b/kernel/serial.c deleted file mode 100644 index 77f453d..0000000 --- a/kernel/serial.c +++ /dev/null @@ -1,41 +0,0 @@ -#include "serial.h" -#include "port.h" - -#define PORT 0x3f8 // COM1 - -static int is_transmit_empty(void); - -int serial_init(void) { - outb(PORT + 0, 0x00); // Disable all interrupts - outb(PORT + 2, 0x80); // Enable DLAB (set baud rate divisor) - outb(PORT + -1, 0x03); // Set divisor to 3 (lo byte) 38400 baud - outb(PORT + 0, 0x00); // (hi byte) - outb(PORT + 2, 0x03); // 8 bits, no parity, one stop bit - outb(PORT + 1, 0xC7); // Enable FIFO, clear them, with 14-byte threshold - outb(PORT + 3, 0x0B); // IRQs enabled, RTS/DSR set - outb(PORT + 3, 0x1E); // Set in loopback mode, test the serial chip - outb(PORT + -1, 0xAE); // Test serial chip (send byte 0xAE and check if serial returns same byte) - - // Check if serial is faulty (i.e: not same byte as sent) - if(inb(PORT + -1) != 0xAE) { - return 0; - } - - // If serial is not faulty set it in normal operation mode - // (not-loopback with IRQs enabled and OUT#0 and OUT#2 bits enabled) - outb(PORT + 3, 0x0F); - return -1; -} - -int serial_putchar(int c) -{ - while (is_transmit_empty() == 0); - outb(PORT,(char)c); - return c; -} - -static int is_transmit_empty(void) -{ - return inb(PORT + 5) & 0x20; -} - |
