trying to fix the drivers and also the isr, gdt and isr header files.

src/drivers/screen/screen.c

@@ -1,27 +1,63 @@
 #include "screen.h"
-#include <dos.h>
 
-void screen_init() {
-    // Initialize the screen driver
-    // Add any necessary initialization code here
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+// Video memory address
+#define VIDEO_MEMORY_ADDRESS 0xB8000
+
+// Screen attributes (color)
+static uint8_t screen_color =
+    (SCREEN_COLOR_LIGHT_GRAY << 4) | SCREEN_COLOR_BLACK;
+
+// Helper function to calculate the screen buffer offset
+static inline uint16_t screen_offset(uint8_t x, uint8_t y)
+{
+    return (y * SCREEN_WIDTH + x) * 2;
 }
 
-void set_40_column_mode() {
-    // Set the screen mode to 40 columns
-    union REGS regs;
-    regs.h.ah = 0x00;
-    regs.h.al = 0x03;
-    int86(0x10, &regs, &regs);
+// Initialize the screen driver
+void screen_init()
+{
+    // No initialization required for this simple driver
 }
 
-void set_80_column_mode() {
-    // Set the screen mode to 80 columns
-    union REGS regs;
-    regs.h.ah = 0x00;
-    regs.h.al = 0x03;
-    int86(0x10, &regs, &regs);
+// Clear the screen
+void screen_clear()
+{
+    uint16_t *video_memory = (uint16_t *)VIDEO_MEMORY_ADDRESS;
+    for (int i = 0; i < SCREEN_WIDTH * SCREEN_HEIGHT; i++)
+    {
+        video_memory[i] = ' ' | (screen_color << 8);
+    }
+}
 
-    regs.h.ah = 0x00;
-    regs.h.al = 0x07;
-    int86(0x10, &regs, &regs);
+// Set the foreground and background colors
+void screen_set_color(uint8_t foreground, uint8_t background)
+{
+    screen_color = (background << 4) | foreground;
+}
+
+// Print a character at the specified position
+void screen_put_char(char c, uint8_t x, uint8_t y)
+{
+    uint16_t *video_memory = (uint16_t *)VIDEO_MEMORY_ADDRESS;
+    uint16_t  offset       = screen_offset(x, y);
+    video_memory[offset]   = c | (screen_color << 8);
+}
+
+// Print a null-terminated string at the specified position
+void screen_put_string(const char *str, uint8_t x, uint8_t y)
+{
+    uint16_t *video_memory = (uint16_t *)VIDEO_MEMORY_ADDRESS;
+    uint16_t  offset       = screen_offset(x, y);
+    while (*str)
+    {
+        video_memory[offset] = *str | (screen_color << 8);
+        str++;
+        offset += 2;
+    }
 }

src/drivers/screen/screen.h

@@ -1,13 +1,47 @@
 #ifndef SCREEN_H
 #define SCREEN_H
 
-// Function to initialize the screen driver
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+// Screen dimensions
+#define SCREEN_WIDTH  80
+#define SCREEN_HEIGHT 25
+
+// Screen colors
+#define SCREEN_COLOR_BLACK         0
+#define SCREEN_COLOR_BLUE          1
+#define SCREEN_COLOR_GREEN         2
+#define SCREEN_COLOR_CYAN          3
+#define SCREEN_COLOR_RED           4
+#define SCREEN_COLOR_MAGENTA       5
+#define SCREEN_COLOR_BROWN         6
+#define SCREEN_COLOR_LIGHT_GRAY    7
+#define SCREEN_COLOR_DARK_GRAY     8
+#define SCREEN_COLOR_LIGHT_BLUE    9
+#define SCREEN_COLOR_LIGHT_GREEN   10
+#define SCREEN_COLOR_LIGHT_CYAN    11
+#define SCREEN_COLOR_LIGHT_RED     12
+#define SCREEN_COLOR_LIGHT_MAGENTA 13
+#define SCREEN_COLOR_YELLOW        14
+#define SCREEN_COLOR_WHITE         15
+
+// Initialize the screen driver
 void screen_init();
 
-// Function to set the screen mode to 40 columns
-void set_40_column_mode();
+// Clear the screen
+void screen_clear();
 
-// Function to set the screen mode to 80 columns
-void set_80_column_mode();
+// Set the foreground and background colors
+void screen_set_color(uint8_t foreground, uint8_t background);
+
+// Print a character at the specified position
+void screen_put_char(char c, uint8_t x, uint8_t y);
+
+// Print a null-terminated string at the specified position
+void screen_put_string(const char *str, uint8_t x, uint8_t y);
 
 #endif

src/drivers/tty/tty.c

@@ -0,0 +1,36 @@
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "../display.h"
+#include "../interrupts.h"
+#include "../io/io.h"
+#include "../keyboard.h"
+#include "../string.h"
+#include "./screen/screen.h"
+
+#include "./tty.h"
+
+// Function definitions
+
+// Example function to print a message to the console
+void tty_print(const char *message)
+{
+    printf("%s", message);
+}
+
+// Example function to read input from the console
+void tty_read(char *buffer, size_t size)
+{
+    fgets(buffer, size, stdin);
+}
+
+// Example function to clear the console
+void tty_clear()
+{
+    printf("\033[2J\033[H");
+}
+
+// More function definitions...

src/drivers/tty/tty.h

@@ -0,0 +1,12 @@
+#ifndef TTY_H
+#define TTY_H
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <stddef.h>
+#include <stdbool.h>
+
+// Function declarations
+
+#endif // TTY_H

src/kernel/arch/x86/gdt.c

@@ -1,10 +1,21 @@
 #include "gdt.h"
+#include "isr.h"
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
 #include <string.h>
+#include <inttypes.h>
+
 // GDT table
-struct gdt_entry gdt[3];
+struct gdt_entry *gdt;
 
 // GDT pointer
-struct gdt_ptr gp;
+struct gdt_ptr {
+    uint16_t limit;
+    void* base;
+} gp;
 
 // Initialize a GDT entry
 void gdt_set_gate(uint32_t num, uint32_t base, uint32_t limit, uint8_t access,
@@ -24,10 +35,11 @@ void gdt_init()
 {
     // Set up GDT pointer
     gp.limit = (sizeof(struct gdt_entry) * 3) - 1;
-    gp.base  = (uint32_t)&gdt;
+    gdt      = (struct gdt_entry*)malloc(sizeof(struct gdt_entry) * 3);
+    gp.base  = gdt;
 
     // Clear GDT
-    memset(&gdt, 0, sizeof(gdt));
+    memset(gdt, 0, sizeof(struct gdt_entry) * 3);
 
     // Set up code segment
     gdt_set_gate(1, 0, 0xFFFFFFFF, 0x9A, 0xCF);
@@ -36,7 +48,7 @@ void gdt_init()
     gdt_set_gate(2, 0, 0xFFFFFFFF, 0x92, 0xCF);
 
     // Load GDT
-    _asm volatile("lgdt %0" : : "m"(gp));
+    asm volatile("lgdt %0" : : "m"(gp));
 }
 
 // Exception handlers

src/kernel/arch/x86/idt.c

@@ -1,6 +1,12 @@
 #include "idt.h"
 #include <string.h>
 
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+
 // IDT table
 struct idt_entry idt[256];
 

src/kernel/arch/x86/isr.h

@@ -16,7 +16,7 @@ struct isr_regs
 };
 
 // Register an ISR
-void isr_register(uint8_t num, void (*handler)(struct isr_regs *regs));
+void isr_register(uint8_t num, void (*handler)(void));
 
 // ISR handler
 void isr_handler(struct isr_regs *regs);