Added utility functions in system.h

src/kernel/entry.asm

@@ -2,8 +2,14 @@
 [global _start]
 
 [extern main]
+[extern idtp]
 
 _start:
     call main
     cli
     hlt
+
+[global idtLoad]
+idtLoad:
+    lidt [idtp]
+    ret

src/kernel/idt.c

@@ -28,5 +28,7 @@ void idtSetGate(uint8_t i, uint32_t offset, uint16_t selector, uint8_t typeAttr)
 void setupIdt() {
     idtp.limit = sizeof(struct idtEntry) * 256;
     idtp.base = (uint32_t)&idt;
+
+    idtLoad();
 }
 

src/kernel/idt.h

@@ -5,6 +5,7 @@
 
 void setupIdt();
 void idtSetGate(uint8_t i, uint32_t offset, uint16_t selector, uint8_t typeAttr);
+extern void idtLoad();
 
 #endif
 

src/kernel/system.c

@@ -1,3 +1,27 @@
 #include "system.h"
+#include "stdint.h"
 
+uint8_t inb(uint16_t port) {
+    uint8_t result;
+    asm volatile("in %1, %0" : "=a"(result) : "Nd"(port));
+    return result;
+}
+
+void outb(uint16_t port, uint8_t data) {
+    asm volatile("out %0, %1" :: "a"(data), "Nd"(port));
+}
+
+char* memcopy(char* src, char* dst, uint16_t length) {
+    for (int i = 0; i < length; i++) {
+        *(dst + i) = *(src + i);
+    }
+    return dst;
+}
+
+char* memset(char* dst, char value, uint16_t length) {
+    for (int i = 0; i < length; i++) {
+        *(dst + i) = value;
+    }
+    return dst;
+}
 

src/kernel/system.h

@@ -1,6 +1,21 @@
 #ifndef SYSTEM_H
 #define SYSTEM_H
 
+#include "stdint.h"
 
+// Port functions
+uint8_t inb(uint16_t port);
+void outb(uint16_t port, uint8_t data);
+
+// Memory functions
+char* memcopy(char* src, char* dst, uint16_t length);
+char* memset(char* dst, char data, uint16_t length);
+
+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