Initial Commit of files

src/boot/boot.asm

@@ -0,0 +1,61 @@
+; Set up the segment registers
+   xor ax, ax
+   mov ds, ax
+   mov es, ax
+
+   ; Set up stack and jump to main
+   mov ss, ax
+   mov sp, 0x7c00
+   jmp main
+
+   ; Print 'Booting ClassicOS!' to the screen
+   print:
+       mov si, message
+       mov ah, 0x0e
+   .loop:
+       lodsb
+       test al, al
+       jz .done
+       int 0x10
+       jmp .loop
+   .done:
+       ret
+
+   ; Set the video mode to a 40 column text mode
+   set_video_mode:
+       mov ax, 0x0003    ; Set up a 80x25 text mode
+       int 0x10
+
+       ; Set the number of columns to 40
+       mov ax, 0x1112
+       mov bx, 0x0007
+       int 0x10
+
+       ret
+
+   ; Bootloader entry point
+   main:
+       ; Call the set_video_mode function
+       call set_video_mode
+
+       ; Clear the screen
+       mov ah, 0x06
+       mov al, 0
+       xor bx, bx
+       xor cx, cx
+       mov dh, 24
+       mov dl, 39
+       int 0x10
+
+       ; Call the print function
+       call print
+
+       ; Infinite loop
+   .loop:
+       jmp .loop
+
+   ; Message to print
+   message db 'Booting ClassicOS!', 0
+
+   times 510-($-$$) db 0
+   dw 0xaa55

src/boot/linker.ld

@@ -0,0 +1,8 @@
+ ENTRY(boot)
+     SECTIONS {
+       . = 0x7c00;
+       .text : {
+         *(.text)
+       }
+       /* Add other sections as needed */
+     }

src/drivers/screen/screen.c

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+#include "screen.h"
+#include <dos.h>
+
+void screen_init() {
+    // Initialize the screen driver
+    // Add any necessary initialization code here
+}
+
+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);
+}
+
+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);
+
+    regs.h.ah = 0x00;
+    regs.h.al = 0x07;
+    int86(0x10, &regs, &regs);
+}

src/drivers/screen/screen.h

@@ -0,0 +1,13 @@
+#ifndef SCREEN_H
+#define SCREEN_H
+
+// Function to initialize the screen driver
+void screen_init();
+
+// Function to set the screen mode to 40 columns
+void set_40_column_mode();
+
+// Function to set the screen mode to 80 columns
+void set_80_column_mode();
+
+#endif

src/kernel/kernel.c

@@ -0,0 +1,12 @@
+#include "kernel.h"
+
+void kernel_main() {
+    // Your kernel code here
+    // Example: Print a message to the screen
+    print_string("Welcome to ClassicOS!");
+
+    // Infinite loop to keep the kernel running
+    while (1) {
+        // Your kernel code here
+    }
+}

src/kernel/kernel.h

@@ -0,0 +1,7 @@
+#ifndef KERNEL_H
+#define KERNEL_H
+
+// Function to print a null-terminated string to the screen
+void print_string(const char* str);
+
+#endif