View difference between Paste ID: PAWSzCr0 and Cde250Yi

 org 7c00h
 
 use16
 
 cli
 lgdt[gdt]
 mov eax,cr4
 or al,1
 mov cr4,eax
 mov eax,cr0
 or al,1
 mov cr0,eax
 jmp gdt_code-gdt_table:pmode
 
 vm86:
 mov ax,0e41h
 mov bx,7
 int 10h
 
 ;which interrupt trigger to end the virtual 8086 mode?
 
 jmp $
 
 use32
 
 pmode:
 mov ax,gdt_data-gdt_table
 mov gs,ax
 mov fs,ax
 mov ds,ax
 mov es,ax
 mov ss,ax
 mov esp,9fffch
 mov ax,18h
 ltr ax
 mov al,11h
 out 20h,al
 mov al,20h
 out 21h,al
 mov al,4
 out 21h,al
 mov al,1
 out 21h,al
 mov al,255-1 shl 6
 out 21h,al
 mov edi,idt_table
 mov edx,8e00h
 mov eax,(gdt_code-gdt_table) shl 16
 mov ecx,20h
 interrupts1:
 mov [edi],eax
 mov [edi+4],edx
 add edi,8
 loop interrupts1
 mov edx,8f00h
 mov eax,(gdt_code-gdt_table) shl 16
 add ecx,8
 interrupts2:
 mov [edi],eax
 mov [edi+4],edx
 add edi,8
 loop interrupts2
 mov edx,8f00h
 mov eax,(gdt_code-gdt_table) shl 16
 mov ecx,256-8-32
 interrupts3:
 mov [edi],eax
 mov [edi+4],edx
 add edi,8
 loop interrupts3
 mov word[idt_table+20h*8+6*8],second_sector
 mov word[idt_table+49*8],function_floppy
 lidt[idt]
 sti
 push 0
 push 0
 push 0
 push 0
 push 0
 push 0fffeh
-push 23000h
+push 20000h
 push 0
 push vm86
 iretd
 int 49
 jmp $
 
 function_floppy:
 mov dx,3f2h
 mov al,1ch
 out dx,al
 mov al,6
 out 0ah,al
 mov al,0ffh
 out 0ch,al
 mov al,0
 out 4,al
 mov ax,second_sector
 out 81h,al
 mov al,ah
 out 4,al
 mov al,0ffh
 out 5,al
 mov al,1
 out 5,al
 mov al,2
 out 0ah,al
 call readmsr
 mov dx,3f5h
 mov al,66h
 out dx,al
 mov al,0
 out dx,al
 mov al,0
 out dx,al
 mov al,0
 out dx,al
 mov al,2
 out dx,al
 mov al,2
 out dx,al
 mov al,18
 out dx,al
 mov al,27
 out dx,al
 mov al,0ffh
 out dx,al
 iret
 
 readmsr:
 mov dx,3f4h
 in al,dx
 and al,0c0h
 cmp al,80h
 jne readmsr
 ret
 
 gdt:
 dw gdt_end-gdt_table-1
 dd gdt_table
 
 gdt_table:
 dq 0
 
 gdt_code:
 dw 0ffffh
 dw 0
 db 0
 db 9ah
 db 0cfh
 db 0
 
 gdt_data:
 dw 0ffffh
 dw 0
 db 0
 db 92h
 db 0cfh
 db 0
 
 gdt_tss:
 dw 0ffffh
 dw 0
 db 0
 db 89h
 db 8fh
 db 0
 
 gdt_end:
 
 idt:
 dw idt_end-256*8-1
 dd idt_table
 
 idt_table=256*4
 
 idt_end:
 
 times 510-($-$$) db 0
 dw 0aa55h
 
 second_sector:
 mov byte[0b8000h],43h
 mov byte[0b8000h+1],0ch
 mov byte[0b8000h+2],69h
 mov byte[0b8000h+3],0ch
 mov byte[0b8000h+4],61h
 mov byte[0b8000h+5],0ch
 mov byte[0b8000h+6],6fh
 mov byte[0b8000h+7],0ch
 mov byte[0b8000h+8],21h
 mov byte[0b8000h+9],0ch
 mov byte[0b8000h+10],20h
 mov byte[0b8000h+11],0ch
 mov byte[0b8000h+12],3ah
 mov byte[0b8000h+13],0ch
 mov byte[0b8000h+14],29h
 mov byte[0b8000h+15],0ch
 jmp $
 
 times 512-($-second_sector) db 0