adds some more data types for printf, and moves gdt_init to a different file

kernel/arch/gdt/gdt_entry.c

@@ -1,5 +1,9 @@
 #include <kernel/x86/gdt.h>
 
+#ifdef __TESTING__
+#include <kernel/_kernel.h>
+#endif
+
 uint64_t create_descriptor(uint32_t base, uint32_t limit, uint16_t flag)
 {
 	uint64_t descriptor;
@@ -16,3 +20,21 @@ uint64_t create_descriptor(uint32_t base, uint32_t limit, uint16_t flag)
 
 	return descriptor;
 }
+
+void gdt_init(uint64_t* gdt)
+{ 
+#ifdef __TESTING__
+	kinfo("Initializing the GDT");
+#endif
+	gdt[0] = create_descriptor(0, 0, 0); // null
+	gdt[1] = create_descriptor(0, 0x000FFFFF, (GDT_CODE_PL0)); // kernel code
+	gdt[2] = create_descriptor(0, 0x000FFFFF, (GDT_DATA_PL0)); // kernel data
+	gdt[3] = create_descriptor(0, 0x000FFFFF, (GDT_CODE_PL3)); // user code
+	gdt[4] = create_descriptor(0, 0x000FFFFF, (GDT_DATA_PL3)); // user data
+
+	setGdt((sizeof(uint64_t) * GDT_SIZE) - 1, &(gdt[0])); // limit, base
+	reloadSegments();
+#ifdef __TESTING__
+	kinfo("Initialized the GDT");
+#endif
+}

kernel/include/kernel/x86/gdt.h

@@ -55,7 +55,8 @@ void setGdt(unsigned short limit, uint64_t* base);
 void reloadSegments();
 
 uint64_t create_descriptor(uint32_t base, uint32_t limit, uint16_t flag);
-void gdt_init(void);
+
+void gdt_init(uint64_t* gdt);
 
 #endif
 

kernel/kmain.c

@@ -10,33 +10,13 @@
 
 uint64_t gdt[GDT_SIZE];
 
-void gdt_init()
-{ 
-#ifdef __TESTING__
-	kinfo("Initializing the GDT");
-#endif
-	gdt[0] = create_descriptor(0, 0, 0); // null
-	gdt[1] = create_descriptor(0, 0x000FFFFF, (GDT_CODE_PL0)); // kernel code
-	gdt[2] = create_descriptor(0, 0x000FFFFF, (GDT_DATA_PL0)); // kernel data
-	gdt[3] = create_descriptor(0, 0x000FFFFF, (GDT_CODE_PL3)); // user code
-	gdt[4] = create_descriptor(0, 0x000FFFFF, (GDT_DATA_PL3)); // user data
-
-	setGdt((sizeof(uint64_t) * GDT_SIZE) - 1, &(gdt[0])); // limit, base
-	reloadSegments();
-#ifdef __TESTING__
-	kinfo("Initialized the GDT");
-#endif
-}
-
 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);
 
@@ -46,6 +26,6 @@ void kmain(void)
 #endif
 
 
-	printf("Integer: %d\n", 10);
+	printf("Integer: %1\n", gdt[1]);
 	printf("Hex Int: %x\n", 2);
 }

libc/stdio/printf.c

@@ -3,6 +3,7 @@
 #include <stdarg.h>
 #include <stdio.h>
 #include <string.h>
+#include <stdint.h>
 
 #include <kernel/_kernel.h>
 
@@ -19,6 +20,58 @@ static void reverse(char* buf, int len)
 	}
 }
 
+static char* s64toa(int64_t num, char* buf, int base)
+{
+	int i = 0;
+	bool neg = false;
+	
+	if (num == 0) { // Handle zero explicitly
+		buf[i++] = '0';
+		buf[i] = '\0';
+		return buf;
+	}
+
+	if (num < 0 && base == 10) { // only handle negative on base10
+		neg = true;
+		num = -num;
+	}
+
+	while (num != 0) {
+		int rem = num % base;
+		buf[i++] = (rem > 9) ? (rem - 10) + 'a' : rem + '0';
+		num = num / base;
+	}
+
+	if (neg) // lets reapply the negative sign
+		buf[i++] = '-'; 
+
+	buf[i] = '\0';
+
+	reverse(buf, i); // reverse, since we did it backwards!
+	return buf;
+}
+
+static char* u64toa(uint64_t num, char* buf, int base)
+{
+	int i = 0;
+	if (num == 0) { // Handle zero explicitly
+		buf[i++] = '0';
+		buf[i] = '\0';
+		return buf;
+	}
+
+	while (num != 0) {
+		int rem = num % base;
+		buf[i++] = (rem > 9) ? (rem - 10) + 'a' : rem + '0';
+		num = num / base;
+	}
+
+	buf[i] = '\0';
+
+	reverse(buf, i); // reverse, since we did it backwards!
+	return buf;
+}
+
 static char* itoa(int num, char* buf, int base)
 {
 	int i = 0;
@@ -132,6 +185,30 @@ int printf(const char* restrict format, ...) {
 			if (!print(buffer, len))
 				return -1;
 			written += len;
+		} else if (*format == '1') {
+			format++;
+			uint64_t i = (uint64_t) va_arg(parameters, uint64_t);
+			u64toa(i, buffer, 16);
+			size_t len = strlen(buffer);
+			if (maxrem < len) {
+				// TODO: Set errno to EOVERFLOW.
+				return -1;
+			}
+			if (!print(buffer, len))
+				return -1;
+			written += len;
+		} else if (*format == '2') {
+			format++;
+			int64_t i = (int64_t) va_arg(parameters, int64_t);
+			s64toa(i, buffer, 16);
+			size_t len = strlen(buffer);
+			if (maxrem < len) {
+				// TODO: Set errno to EOVERFLOW.
+				return -1;
+			}
+			if (!print(buffer, len))
+				return -1;
+			written += len;
 		} else {
 			format = format_begun_at;
 			size_t len = strlen(format);