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adding and fixing some missing things and some undefined

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This commit is contained in:
Gregory Kenneth Bowne
2025-05-13 10:44:10 -07:00
parent ecfa54e225
commit 10b8fdc33f
33 changed files with 267 additions and 29 deletions
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37
kernel/serial.c
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@@ -1,20 +1,39 @@
#include "io.h"
#include "serial.h"
#define COM1 0x3F8
#define COM2 0x2F8
#define COM3 0x3E8
#define COM4 0x2E8
void serial_init_port(uint16_t port) {
outb(port + 1, 0x00);
outb(port + 3, 0x80);
outb(port + 0, 0x03);
outb(port + 1, 0x00);
outb(port + 3, 0x03);
outb(port + 2, 0xC7);
outb(port + 4, 0x0B);
}
void serial_init(void) {
outb(COM1 + 1, 0x00); // Disable interrupts
outb(COM1 + 3, 0x80); // Enable DLAB
outb(COM1 + 0, 0x03); // Set baud rate to 38400
outb(COM1 + 1, 0x00);
outb(COM1 + 3, 0x03); // 8 bits, no parity, one stop bit
outb(COM1 + 2, 0xC7); // Enable FIFO, clear, 14-byte threshold
outb(COM1 + 4, 0x0B); // IRQs enabled, RTS/DSR set
serial_init_port(COM1);
serial_init_port(COM2);
serial_init_port(COM3);
serial_init_port(COM4);
}
void serial_write_char(char c) {
while (!(inb(COM1 + 5) & 0x20));
outb(COM1, c);
}
void serial_write(const char *str) {
while (*str) {
while (!(inb(COM1 + 5) & 0x20)); // Wait for the transmitter holding register to be empty
outb(COM1, *str++);
serial_write_char(*str++);
}
}
void serial_write_string(const char* str) {
serial_write(str);
}