Moved IDT code wholely to idt.c, add keyboard read support, add readline function, updated Makefile accordingly.

Makefile

@@ -2,7 +2,7 @@ CFLAGS = -m32 -mgeneral-regs-only -nostdlib -fno-builtin -fno-exceptions -fno-le
 LDFLAGS = 
 
 DISK_IMG_FILES = kernel.bin hello.bin print.bin boot32.bin kernel32.bin
-KERNEL32_OBJS = screenstuff.o io.o idt.o kernel32_strap.o kernel32.o
+KERNEL32_OBJS = screenstuff.o io.o idt.o keyboard.o kernel32_strap.o kernel32.o
 
 run: disk.img
 	qemu-system-x86_64 disk.img

idt.c

@@ -14,6 +14,11 @@ void set_entry(uint8_t interrupt_number, uint16_t code_segment, void* handler, u
   };
 }
 
+__attribute__((interrupt)) void interrupt_20(struct interrupt_frame* frame) {
+//  printf("Interrupt 20 received!!\n");
+  outb(0x20, 0x20);
+}
+
 __attribute__((interrupt)) void ignore_interrupt(struct interrupt_frame* frame) {
   // Do nothing
 }
@@ -23,6 +28,19 @@ void init_idt() {
   asm volatile("lidt %0" : : "m" (desc));
   for (int i=0; i<256; i++)
     set_entry(i, 0x08, &ignore_interrupt, 0x8E);
+  
+  set_entry(0x20, 0x08, &interrupt_20, 0x8E);
+
+  outb(0x20, 0x11);
+  outb(0xA0, 0x11);
+  outb(0x21, 0x20);
+  outb(0xA1, 0x28);
+  outb(0x21, 0x04);
+  outb(0xA1, 0x02);
+  outb(0x21, 0x01);
+  outb(0xA1, 0x01);
+  outb(0x21, 0x00);
+  outb(0xA1, 0x00);
 }
 
 void enable_idt() {

kernel32.c

@@ -2,33 +2,50 @@
 #include "screenstuff.h"
 #include "io.h"
 #include "idt.h"
+#include "keyboard.h"
 
-__attribute__((interrupt)) void interrupt_21(struct interrupt_frame* frame) {
-  printf("Interrupt 20 received!!\n");
-  outb(0x20, 0x20);
+bool strcmp(char* a, char* b, int max) {
+  int index = 0;
+  while (index < max) {
+    if (a[index] != b[index])
+      return false;
+    index++;
+  }
+  return true;
 }
 
 int main() {
   init_idt();
-  set_entry(0x20, 0x08, &interrupt_21, 0x8E);
   init_term();
 
   printf("KERNEL32 OK!\n");
 
   printf("Hello, World!\n\nWe are running XnoeOS Code in C now, Protected Mode has been achieved and everything is working super nicely!\n\nHow wonderful!\n\nNow I just need to hope my print function works properly too~~\n");
 
-  outb(0x20, 0x11);
-  outb(0xA0, 0x11);
-  outb(0x21, 0x20);
-  outb(0xA1, 0x28);
-  outb(0x21, 0x04);
-  outb(0xA1, 0x02);
-  outb(0x21, 0x01);
-  outb(0xA1, 0x01);
-  outb(0x21, 0x00);
-  outb(0xA1, 0x00);
-
+  init_keyboard();
   enable_idt();
 
-  while (1);
+
+  while (1) {
+    printf(">>> ");
+    char buffer[128];
+    for (int i=0; i<128; i++)
+      buffer[i] = 0;
+    readline(128, buffer);
+
+    //printf("%s\n", buffer);
+    if (strcmp(buffer, "help", 4)) {
+      printf(
+        "XnoeOS 32 Bit Mode Help.\n"
+        "------------------------\n"
+        "- help\n"
+        ": Shows this message\n"
+        "- clear\n"
+        ": Clears the screen\n"
+      );
+    } else if (strcmp(buffer, "clear", 5)) {
+      clear_screen();
+      set_curpos(0, 0);
+    }
+  }
 }

keyboard.c

@@ -0,0 +1,90 @@
+#include "keyboard.h"
+
+
+char key_to_char[128] = {
+  0, 0, '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '-', '=', 0, 0, 
+  'q', 'w', 'e', 'r', 't', 'y', 'u', 'i', 'o', 'p', '[', ']', 0,
+  0, 'a', 's', 'd', 'f', 'g', 'h', 'j', 'k', 'l', ';', '\'', '`', 0, '\\',
+  'z', 'x', 'c', 'v', 'b', 'n', 'm', ',', '.', '/', 0, '*', 0, ' ', 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, '7', '8', '9', '-', '4', '5', '6', '+',
+  '1', '2', '3', '0', '.', 0, 0, 0, 0, 0,
+  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+};
+
+char key_to_char_caps[128] = {
+  0, 0, '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '-', '=', 0, 0, 
+  'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', 'O', 'P', '[', ']', 0,
+  0, 'A', 'S', 'D', 'F', 'G', 'H', 'J', 'K', 'L', ';', '\'', '`', 0, '\\',
+  'Z', 'X', 'C', 'V', 'B', 'N', 'M', ',', '.', '/', 0, '*', 0, ' ', 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, '7', '8', '9', '-', '4', '5', '6', '+',
+  '1', '2', '3', '0', '.', 0, 0, 0, 0, 0,
+  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+};
+
+char key_to_char_shift[128] = {
+  0, 0, '!', '@', '#', '$', '%', '^', '&', '*', '(', ')', '_', '+', 0, 0, 
+  'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', 'O', 'P', '{', '}', 0,
+  0, 'A', 'S', 'D', 'F', 'G', 'H', 'J', 'K', 'L', ':', '"', '~', 0, '|',
+  'Z', 'X', 'C', 'V', 'B', 'N', 'M', ',', '.', '/', 0, '*', 0, ' ', 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, '7', '8', '9', '-', '4', '5', '6', '+',
+  '1', '2', '3', '0', '.', 0, 0, 0, 0, 0,
+  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+};
+
+uint8_t current_scancode = 0;
+
+__attribute__((interrupt)) void keyboard_interrupt(struct interrupt_frame* frame) {
+  current_scancode = inb(0x60);
+  outb(0x20, 0x21);
+}
+
+void init_keyboard() {
+  set_entry(0x21, 0x08, &keyboard_interrupt, 0x8E);
+
+  while (inb(0x64) & 1) {
+    inb(0x60);
+  }
+  
+  outb(0x64, 0xAE);
+  outb(0x64, 0x20);
+  uint8_t keyboard_status = (inb(0x60) | 1) & ~0x10;
+  outb(0x64, 0x60);
+  outb(0x60, keyboard_status);
+  outb(0x60, 0xF4);
+}
+
+bool caps_on = false;
+bool shift_on = false;
+
+void readline(int max, char* buffer) {
+  int index = 0;
+
+
+  uint8_t scancode = current_scancode;
+  while (scancode != 0x1c || index == 0) {
+    while (scancode == current_scancode);
+    scancode = current_scancode;
+
+    char decoded = 0;
+
+    if ((scancode&0x7f) == 0x2a)
+      shift_on = !(scancode&0x80);
+
+    if (scancode == 0x0e && index > 0) {
+      set_curpos_raw(get_curpos()-1);
+      non_moving_put(' ');
+      index--;
+    }
+
+    if (!shift_on)
+      decoded = key_to_char[scancode&0x7f];
+    else
+      decoded = key_to_char_shift[scancode&0x7f];
+
+    if (decoded && scancode < 0x80) {
+      buffer[index++] = decoded;
+      printf("%c", decoded);
+    }
+  }
+  printf("\n");
+}

keyboard.h

@@ -0,0 +1,12 @@
+#ifndef KEYBOARD_H
+#define KEYBOARD_H
+
+#include <stdbool.h>
+#include "io.h"
+#include "screenstuff.h"
+#include "idt.h"
+
+void init_keyboard();
+void readline(int max, char* buffer);
+
+#endif