Added program to enter load kernel32.bin, enter Protected Mode, and then execute kernel32.bin

Makefile

@@ -1,4 +1,4 @@
-disk.img: boot.sector kernel.bin hello.bin print.bin hello.txt
+disk.img: boot.sector kernel.bin hello.bin print.bin hello.txt boot32.bin
 	dd if=/dev/zero of=disk.img count=43 bs=100k
 	dd if=boot.sector of=disk.img conv=notrunc
 	mount disk.img img.d
@@ -8,13 +8,16 @@ disk.img: boot.sector kernel.bin hello.bin print.bin hello.txt
 	chmod 777 disk.img
 
 boot.sector: boot.asm
-	nasm boot.asm -o $@
+	nasm $< -o $@
 
 kernel.bin: kernel.asm
-	nasm kernel.asm -o $@
+	nasm $< -o $@
 
 hello.bin: hello.asm
-	nasm hello.asm -o $@
+	nasm $< -o $@
 
 print.bin: print.asm
-	nasm print.asm -o $@
+	nasm $< -o $@
+
+boot32.bin: boot32.asm
+	nasm $< -o $@

boot32.asm

@@ -0,0 +1,91 @@
+  [ORG 0x40000]
+
+  push bp
+  mov bp, sp
+  mov ax, [bp + 6]
+;  xor ax, ax
+  mov ds, ax
+  mov word [program_segment], ax
+
+  mov si, kernel32_name
+  mov ah, 4
+  int 22h
+
+  cmp ax, 0
+  je load_err
+
+  push ax
+
+  mov si, kernel32_found_success_msg
+  mov ah, 1
+  int 22h
+
+  ; Enable the A20 line
+  ; We don't really care about supporting super old machines
+  in al, 0x92
+  or al, 2
+  out 0x92, al
+
+  pop si
+  mov di, 0 ; Load kernel32.bin at 0x40200
+  mov bx, 8000h
+  mov ah, 3
+  int 22h
+
+  mov si, kernel32_exec_msg
+  mov ah, 1
+  int 22h
+
+  ; Prepare for for kernel32.bin execution
+
+  cli
+  lgdt [gdt_desc]
+  mov eax, cr0
+  or eax, 1
+  mov cr0, eax
+
+  ; Execute kernel32.bin
+
+  jmp 08h:0
+
+  jmp exit
+  
+
+load_err:
+  mov si, kernel32_load_err_msg
+  mov ah, 1
+  int 22h
+
+exit:
+  pop bp
+  retf
+
+kernel32_name db "KERNEL32BIN"
+kernel32_load_err_msg db "FAILED TO LOAD KERNEL32.BIN", 10, 0
+kernel32_found_success_msg db "FOUND KERNEL32.BIN", 10, 0
+kernel32_exec_msg db "EXECUTING KERNEL32.BIN...", 10, 0
+
+program_segment dw 0
+
+gdt:
+gdt_null:
+  dq 0
+gdt_code:
+  dw 0xffff
+  dw 0x0
+  db 0x8
+  db 10011010b
+  db 01001111b
+  db 0
+gdt_data:
+  dw 0xffff
+  dw 0x0
+  db 0x8
+  db 10010010b
+  db 01001111b
+  db 0
+gdt_end:
+
+gdt_desc:
+  dw gdt_end - gdt - 1
+  dd gdt