After C Switch

src/kernel/entry.asm

@@ -0,0 +1,9 @@
+[bits 32]
+[global _start]
+
+[extern main]
+
+_start:
+    call main
+    cli
+    hlt

src/kernel/main.c

@@ -0,0 +1,6 @@
+#include "screen.h"
+
+void main() {
+    print("Hello, World!", 0x0f);
+}
+

src/kernel/screen.c

@@ -0,0 +1,21 @@
+#include "screen.h"
+
+unsigned int cursor = 0;
+
+void putc(char c, char attr) {
+    int mem = VIDMEM + cursor * 2;
+    *(char*)(mem) = c;
+    *(char*)(mem+1) = attr;
+
+    cursor++;
+}
+
+void print(char* s, char attr) {
+    int i = 0;
+    char c = *s;
+    while (c != '\0') {
+        putc(c, attr);
+        c = *(s + ++i);
+    }
+}
+

src/kernel/screen.h

@@ -0,0 +1,9 @@
+#ifndef SCREEN_H
+#define SCREEN_H
+
+#define VIDMEM 0xb8000
+
+void putc(char c, char attr);
+void print(char* s, char attr);
+
+#endif