From 8a9208612eec8ddae4c418485d848ecfa0613699 Mon Sep 17 00:00:00 2001 From: Anton Kling Date: Mon, 30 Oct 2023 22:12:14 +0100 Subject: Meta: Move kernel and userland to their own folders. This is to allow both the kernel and the userland to share certain header files and to make the folder structure a bit more clear. --- drivers/serial.c | 35 ----------------------------------- 1 file changed, 35 deletions(-) delete mode 100644 drivers/serial.c (limited to 'drivers/serial.c') diff --git a/drivers/serial.c b/drivers/serial.c deleted file mode 100644 index 549d852..0000000 --- a/drivers/serial.c +++ /dev/null @@ -1,35 +0,0 @@ -#include "cpu/io.h" - -#define PORT 0x3f8 // COM1 - -int serial_init(void) { - outb(PORT + 1, 0x00); // Disable all interrupts - outb(PORT + 3, 0x80); // Enable DLAB (set baud rate divisor) - outb(PORT + 0, 0x03); // Set divisor to 3 (lo byte) 38400 baud - outb(PORT + 1, 0x00); // (hi byte) - outb(PORT + 3, 0x03); // 8 bits, no parity, one stop bit - outb(PORT + 2, 0xC7); // Enable FIFO, clear them, with 14-byte threshold - outb(PORT + 4, 0x0B); // IRQs enabled, RTS/DSR set - outb(PORT + 4, 0x1E); // Set in loopback mode, test the serial chip - outb(PORT + 0, 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 + 0) != 0xAE) { - return 1; - } - - // If serial is not faulty set it in normal operation mode - // (not-loopback with IRQs enabled and OUT#1 and OUT#2 bits enabled) - outb(PORT + 4, 0x0F); - return 0; -} - -int is_transmit_empty() { return inb(PORT + 5) & 0x20; } - -void write_serial(char a) { - while (is_transmit_empty() == 0) - ; - - outb(PORT, a); -} -- cgit v1.2.3