Kernel: Move debug printing to its own file

It didn't make sense that dprint was defined in Serial.h.
We also now dump dprint to tty if there is no serial and tty is initialized

kernel/kernel/APIC.cpp

@@ -1,10 +1,9 @@
 #include <BAN/ScopeGuard.h>
+#include <kernel/Debug.h>
 #include <kernel/APIC.h>
 #include <kernel/CPUID.h>
 #include <kernel/IDT.h>
-#include <kernel/IO.h>
 #include <kernel/MMU.h>
-#include <kernel/Serial.h>
 
 #include <string.h>
 

kernel/kernel/Debug.cpp

@@ -0,0 +1,16 @@
+#include <kernel/Debug.h>
+#include <kernel/Serial.h>
+#include <kernel/TTY.h>
+
+namespace Debug
+{
+
+	void putchar(char ch)
+	{
+		if (Serial::IsInitialized())
+			return Serial::putchar(ch);
+		if (TTY::IsInitialized())
+			return TTY::PutCharCurrent(ch);
+	}
+
+}

kernel/kernel/Input.cpp

@@ -1,11 +1,11 @@
 #include <BAN/Queue.h>
+#include <kernel/Debug.h>
 #include <kernel/IDT.h>
 #include <kernel/Input.h>
 #include <kernel/InterruptController.h>
 #include <kernel/IO.h>
 #include <kernel/kprint.h>
 #include <kernel/PIT.h>
-#include <kernel/Serial.h>
 
 #include <kernel/KeyboardLayout/FI.h>
 

kernel/kernel/Panic.cpp

@@ -12,10 +12,10 @@ namespace Kernel
 		};
 
 		stackframe* frame = (stackframe*)__builtin_frame_address(0);
-		BAN::Formatter::print(Serial::serial_putc, "\e[36mStack trace:\r\n");
+		BAN::Formatter::print(Debug::putchar, "\e[36mStack trace:\r\n");
 		while (frame)
 		{
-			BAN::Formatter::print(Serial::serial_putc, "    {}\r\n", (void*)frame->eip);
+			BAN::Formatter::print(Debug::putchar, "    {}\r\n", (void*)frame->eip);
 			frame = frame->ebp;
 		}
 	}

kernel/kernel/Serial.cpp

@@ -1,5 +1,5 @@
+#include <BAN/Errors.h>
 #include <kernel/IO.h>
-#include <kernel/Serial.h>
 
 #define COM1_PORT 0x3f8
 
@@ -8,7 +8,7 @@ namespace Serial
 
 	static bool s_initialized = false;
 
-	void initialize()
+	void Initialize()
 	{
 		IO::outb(COM1_PORT + 1, 0x00);    // Disable all interrupts
 		IO::outb(COM1_PORT + 3, 0x80);    // Enable DLAB (set baud rate divisor)
@@ -30,14 +30,18 @@ namespace Serial
 		s_initialized = true;
 	}
 
-	int is_transmit_empty() {
+	bool IsInitialized()
+	{
+		return s_initialized;
+	}
+
+	static int is_transmit_empty() {
 		return IO::inb(COM1_PORT + 5) & 0x20;
 	}
  
-	void serial_putc(char c)
+	void putchar(char c)
 	{
-		if (!s_initialized)
-			return;
+		ASSERT(s_initialized);
 		while (is_transmit_empty() == 0);
 		IO::outb(COM1_PORT, c);
 	}

kernel/kernel/Shell.cpp

@@ -2,14 +2,11 @@
 #include <BAN/StringView.h>
 #include <BAN/Vector.h>
 #include <kernel/CPUID.h>
-#include <kernel/font.h>
 #include <kernel/Input.h>
 #include <kernel/IO.h>
 #include <kernel/PIT.h>
 #include <kernel/RTC.h>
-#include <kernel/Serial.h>
 #include <kernel/Shell.h>
-#include <kernel/TTY.h>
 
 #include <ctype.h>
 

kernel/kernel/TTY.cpp

@@ -1,5 +1,5 @@
 #include <BAN/Errors.h>
-#include <kernel/Serial.h>
+#include <kernel/Debug.h>
 #include <kernel/TTY.h>
 
 #include <string.h>

kernel/kernel/VesaTerminalDriver.cpp

@@ -1,7 +1,7 @@
 #include <BAN/Errors.h>
+#include <kernel/Debug.h>
 #include <kernel/MMU.h>
 #include <kernel/multiboot.h>
-#include <kernel/Serial.h>
 #include <kernel/VesaTerminalDriver.h>
 
 extern const struct bitmap_font font;

kernel/kernel/kernel.cpp

@@ -1,3 +1,4 @@
+#include <kernel/Debug.h>
 #include <kernel/IDT.h>
 #include <kernel/Input.h>
 #include <kernel/InterruptController.h>

kernel/kernel/kmalloc.cpp

@@ -1,6 +1,7 @@
 #include <BAN/Errors.h>
 #include <BAN/Math.h>
 #include <kernel/kmalloc.h>
+#include <kernel/kprint.h>
 #include <kernel/multiboot.h>
 
 #include <stdint.h>