Project restructure (no new code added)

Moved all header files into include/ and removed their C counterparts -> code inside .h files
Also added a kernel.ld linker file
since we don't have many code files in src/ now, i removed src/kernel/
only real code change is that i moved memcopy() and memset() into string.h from system.h

include/idt.h

@@ -0,0 +1,49 @@
+#ifndef IDT_H
+#define IDT_H
+
+#include "stdint.h"
+#include "system.h"
+
+struct idtEntry {
+    uint16_t offsetLow;
+    uint16_t selector;
+    uint8_t zero;
+    uint8_t typeAttr;
+    uint16_t offsetHigh;
+} __attribute__((packed));
+
+struct idtPointer {
+    uint16_t limit;
+    uint32_t base;
+} __attribute__((packed));
+
+struct idtEntry idt[256] = { 0 };
+struct idtPointer idtp;
+
+extern void idtLoad();
+
+void idtSetGate(uint8_t i, uint32_t offset, uint16_t selector, uint8_t typeAttr) {
+    idt[i].offsetLow = (uint16_t)offset;
+    idt[i].selector = selector;
+    idt[i].zero = 0;
+    idt[i].typeAttr = typeAttr;
+    idt[i].offsetHigh = (uint16_t)(offset >> 16);
+}
+
+void setupIdt() {
+    idtp.limit = sizeof(struct idtEntry) * 256;
+    idtp.base = (uint32_t)&idt;
+
+    idtLoad();
+}
+
+// Contains values of registers and exception info from isrs
+struct regs {
+    unsigned int gs, fs, es, ds;
+    unsigned int edi, esi, ebp, esp, ebx, edx, ecx, eax;
+    unsigned int intNo, errCode;
+    unsigned int eip, cs, eflags, useresp, ss;
+};
+
+#endif
+