adds a utility to dump the gdt, adds serial printing for printf in testing

kernel/arch/gdt/gdt_entry.c

@@ -1,9 +1,14 @@
 #include <kernel/x86/gdt.h>
+#include <stdint.h>
+#include <stdio.h>
 
 #ifdef __TESTING__
 #include <kernel/_kernel.h>
 #endif
 
+
+uint64_t gdt[GDT_SIZE];
+
 uint64_t create_descriptor(uint32_t base, uint32_t limit, uint16_t flag)
 {
 	uint64_t descriptor;
@@ -21,7 +26,7 @@ uint64_t create_descriptor(uint32_t base, uint32_t limit, uint16_t flag)
 	return descriptor;
 }
 
-void gdt_init(uint64_t* gdt)
+void gdt_init(void)
 { 
 #ifdef __TESTING__
 	kinfo("Initializing the GDT");
@@ -36,5 +41,13 @@ void gdt_init(uint64_t* gdt)
 	reloadSegments();
 #ifdef __TESTING__
 	kinfo("Initialized the GDT");
+	dump_gdt();
 #endif
 }
+
+void dump_gdt(void)
+{
+	for (int i = 0; i < GDT_SIZE; i++) {
+		printf("GDT_ENTRY %d: %1 | %2\n", i, gdt[i], gdt[i]);
+	}
+}

kernel/include/kernel/x86/gdt.h

@@ -56,8 +56,11 @@ void reloadSegments();
 
 uint64_t create_descriptor(uint32_t base, uint32_t limit, uint16_t flag);
 
-void gdt_init(uint64_t* gdt);
+void gdt_init(void);
+
+void dump_gdt(void);
 
 #endif
 
 
+

kernel/kmain.c

@@ -8,15 +8,13 @@
 #include <kernel/x86/idt.h>
 #include <kernel/x86/pic.h>
 
-uint64_t gdt[GDT_SIZE];
-
 void kmain(void)
 {
 #ifdef __TESTING__ // important components should be declared first, but if we're testing we want to log all of that
 	terminal_initialize();
 	serial_initialize();
 #endif
-	gdt_init(gdt);		
+	gdt_init();		
 	idt_init();
 	PIC_remap(0x20, 0x28);
 
@@ -24,8 +22,4 @@ void kmain(void)
 	terminal_initialize();
 	serial_initialize();
 #endif
-
-
-	printf("Integer: %1\n", gdt[1]);
-	printf("Hex Int: %x\n", 2);
 }

libc/stdio/putchar.c

@@ -2,12 +2,18 @@
 
 #if defined(__is_libk)
 #include <kernel/tty.h>
+#ifdef __TESTING__
+#include <kernel/serial.h>
+#endif
 #endif
 
 int putchar(int ic) {
 #if defined(__is_libk)
 	char c = (char) ic;
 	terminal_write(&c, sizeof(c));
+#ifdef __TESTING__
+	serial_write(&c, sizeof(c));
+#endif
 #else
 	// TODO: Implement stdio and the write system call.
 #endif