Added ports/serial.h header for serial console stuff

include/ports/serial.h

@@ -0,0 +1,24 @@
+#ifndef PORTS_SERIAL_H
+#define PORTS_SERIAL_H
+
+#include <stdint.h>
+
+#define PORT_COM1   0x3f8
+#define PORT_COM2   0x2f8
+#define PORT_COM3   0x3e8
+#define PORT_COM4   0x2e8
+#define PORT_COM5   0x5f8
+#define PORT_COM6   0x4f8
+#define PORT_COM7   0x5e8
+#define PORT_COM8   0x4e8
+
+int setupSerial(uint32_t port);
+
+int serialTransmitEmpty(uint32_t port);
+int serialRecieved(uint32_t port);
+
+void serialWrite(uint32_t port, char c);
+void serialPrint(uint32_t port, char* s);
+char serialRead(uint32_t port);
+
+#endif

libk/ports/serial.c

@@ -0,0 +1,46 @@
+#include <ports/serial.h>
+#include <ports/io.h>
+#include <stdint.h>
+
+int setupSerial(uint32_t port) {
+    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 (low byte) 38400 baud
+    outb(port + 1, 0x00);   //                  (high 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 it returns)
+
+    if (inb(port + 0) != 0xAE) return 1;
+    outb(port + 4, 0x0F);   // non-loopback, IRQs enabled, OUT#1 and OUT#2 bits enabled
+
+    return 0;
+}
+
+int serialTransmitEmpty(uint32_t port) {
+    return inb(port + 5) & 0x20;
+}
+
+int serialRecieved(uint32_t port) {
+    return inb(port + 5) & 0x01;
+}
+
+void serialWrite(uint32_t port, char c) {
+    while (serialTransmitEmpty(port) == 0);
+    outb(port, c);
+}
+
+void serialPrint(uint32_t port, char* s) {
+    while (*s != '\0') {
+        if (*s == '\n') serialWrite(port, '\r');
+        serialWrite(port, *s++);
+    }
+}
+
+char serialRead(uint32_t port) {
+    while (serialRecieved(port));
+    return inb(port);
+}
+

src/kernel.c

@@ -19,6 +19,7 @@
 #include <sound/pcspk.h>
 #include <sound/notes.h>
 #include <ports/io.h>
+#include <ports/serial.h>
 #include <stdio.h> 
 #include <stdlib.h>
 #include <string.h>
@@ -56,6 +57,11 @@ void main() {
     setupTimer();
     setupRtc();
     setupKeyboard();
+    if (setupSerial(PORT_COM1) != 0) { printf("\e[1MFailed to initialize serial interface\e[8M\n"); }
+    else {
+        serialPrint(PORT_COM1, "\x1b[H\x1b[J");
+        serialPrint(PORT_COM1, "kern. \x1b[36m(Serial console)\x1b[0m\n\n");
+    }
 
     // Setup kernel malloc variables
     mallocNode_t* kernelMallocListHead = 0;

todo.txt

@@ -15,12 +15,12 @@ Legend:
         - [ ] system root
         - [ ] arch/
         - [ ] lib/
-        - [ ] include/
+        - [x] include/
         - [ ] cross compiler setup
-    - [ ] libc - User space
-    - [ ] libk - Kernel libc
+    - [x] libc - User space
+    - [x] libk - Kernel libc
     - [ ] kernel
-        - [ ] use libk
+        - [x] use libk
         - [ ] makefile
         - [ ] probably a full rewrite
     - [ ] userspace