Kernel: Add new generic Printer class

kprint is now just a #define to Printer::print<terminal_putc>.

This allows us to use same print formatting for serial output :)

kernel/kernel/Serial.cpp

@@ -0,0 +1,48 @@
+#include <kernel/IO.h>
+#include <kernel/kprint.h>
+#include <kernel/Serial.h>
+
+#define COM1_PORT 0x3f8
+
+namespace Serial
+{
+
+	static bool s_initialized = false;
+
+	void initialize()
+	{
+		IO::outb(COM1_PORT + 1, 0x00);    // Disable all interrupts
+		IO::outb(COM1_PORT + 3, 0x80);    // Enable DLAB (set baud rate divisor)
+		IO::outb(COM1_PORT + 0, 0x03);    // Set divisor to 3 (lo byte) 38400 baud
+		IO::outb(COM1_PORT + 1, 0x00);    //                  (hi byte)
+		IO::outb(COM1_PORT + 3, 0x03);    // 8 bits, no parity, one stop bit
+		IO::outb(COM1_PORT + 2, 0xC7);    // Enable FIFO, clear them, with 14-byte threshold
+		IO::outb(COM1_PORT + 4, 0x0B);    // IRQs enabled, RTS/DSR set
+		IO::outb(COM1_PORT + 4, 0x1E);    // Set in loopback mode, test the serial chip
+		IO::outb(COM1_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(IO::inb(COM1_PORT + 0) != 0xAE) {
+			kprint("Could not initialize COM1 serial port\n");
+			return;
+		}
+
+		// If serial is not faulty set it in normal operation mode
+		// (not-loopback with IRQs enabled and OUT#1 and OUT#2 bits enabled)
+		IO::outb(COM1_PORT + 4, 0x0F);
+		s_initialized = true;
+	}
+
+	int is_transmit_empty() {
+		return IO::inb(COM1_PORT + 5) & 0x20;
+	}
+ 
+	void serial_putc(char c)
+	{
+		if (!s_initialized)
+			return;
+		while (is_transmit_empty() == 0);
+		IO::outb(COM1_PORT, c);
+	}
+
+}

kernel/kernel/kernel.cpp

@@ -1,14 +1,15 @@
 #include <kernel/GDT.h>
 #include <kernel/IDT.h>
+#include <kernel/IO.h>
 #include <kernel/Keyboard.h>
 #include <kernel/kmalloc.h>
+#include <kernel/kprint.h>
 #include <kernel/multiboot.h>
 #include <kernel/panic.h>
 #include <kernel/PIC.h>
 #include <kernel/PIT.h>
+#include <kernel/Serial.h>
 #include <kernel/tty.h>
-#include <kernel/kprint.h>
-#include <kernel/IO.h>
 
 #include <string.h>
 #include <stdlib.h>
@@ -22,6 +23,12 @@ void on_key_press(Keyboard::Key key, uint8_t modifiers, bool pressed)
 {
 	if (pressed)
 	{
+		if (key == Keyboard::Key::Escape)
+		{
+			kprint("time since boot: {} ms\n", PIT::ms_since_boot());
+			return;
+		}
+
 		char ascii = Keyboard::key_to_ascii(key, modifiers);
 		if (ascii)
 			kprint("{}", ascii);
@@ -36,9 +43,13 @@ void kernel_main(multiboot_info_t* mbi, uint32_t magic)
 	s_multiboot_info = mbi;
 
 	if (magic != 0x2BADB002)
-		goto halt;
+		return;
 
-	terminal_initialize();
+	if (mbi->framebuffer.type != 2)
+		return;
+
+	TTY::initialize();
+	Serial::initialize();
 
 	kmalloc_initialize();
 
@@ -49,11 +60,18 @@ void kernel_main(multiboot_info_t* mbi, uint32_t magic)
 	PIT::initialize();
 	Keyboard::initialize(on_key_press);
 
-	kprint("Hello from the kernel!\n");
 
-	ENABLE_INTERRUPTS();
+	kprintln("Hello from the kernel!");
+
+	dprintln("Hello emulator from kernel!");
+
+	int** lol = new int*[10];
+	for (int i = 0; i < 10; i++)
+		lol[i] = new int;
+
+	kprint("{.2}\n", -12.123f);
+	kprint("0x{.H}", 0xcafebabe);
 
-halt:
 	for (;;)
 	{
 		asm("hlt");