asgn7_new.asm

 %macro inout 4
mov rax,%1
mov rdi,%2
mov rsi,%3
mov rdx,%4
syscall
%endmacro


section .data
	msg db "Protected Mode : ",0XA,0XD
	len equ $-msg
	msg2 db "Real Mode : ",0XA,0XD
	len2 equ $-msg2
	msw db "MSW  : ",0XA,0XD
	mswlen equ $-msw
	gdtr db 10,"GDTR : ",0XA,0XD
	gdtrlen equ $-gdtr
	idt db 10,"IDTR : ",0XA,0XD
	idtlen equ $-idt
	tr db 10,"TR : ",0XA,0XD
	trlen equ $-tr
	ld db 10,"LDTR : ",0XA,0XD
	ldlen equ $-ld
	cpu1 db 10,"CPU ID:",0XA,0XD
	cpulen equ $-cpu1


section .bss
gdt resb 8          
gdtli resb 2        
msw1 resb 2        
temp resb 1        
result1 resq 1      
result2 resw 1
idt1 resb 8        
idtli resb 2        
ldt resb 2          
t_r resb 2
section .text
    global _start
_start:
   mov rsi,msw1
   smsw [rsi]
   mov ax,[rsi]
   bt ax,0              
   jc next
   inout 1,1,msg2,len2  
   jmp z1
next: inout 1,1,msg,len
z1:
   inout 1,1,msw,mswlen
   mov ax,word[msw1]
   call display1
   
   inout 1,1,gdtr,gdtrlen
   mov rsi,gdt
   sgdt [rsi]
   mov rax, qword[rsi]
   call display1      
   
   mov rsi,gdtli
   mov ax,word[rsi]
   call display1      
   
   inout 1,1,ld,ldlen
   mov rsi,ldt
   sldt [rsi]
   mov rax, [ldt]
   call display1    
   
       
   inout 1,1,idt,idtlen
   mov rsi,idt1
   sidt [rsi]
   mov rax, [idt1]
   call display1    
   
   mov ax,[idtli]
   call display1      
   
   inout 1,1,tr,trlen
   mov rsi,t_r
   str [rsi]
   mov rax, [t_r]
   call display2
   
   inout 1,1,cpu1,cpulen
   mov eax, 00h
   CPUID
   call display2
     
   inout 60,0,0,0  
   
display1:
    mov bp,16            
up1:
    rol ax,4
    mov qword[result1],rax
    and al,0fh
    cmp al,09h
    jbe next1
    add al,07h
next1:
    add al,30h
    mov byte[temp],al
    inout 1,1,temp,1
    mov rax,qword[result1]
    dec bp
    jnz up1
    ret
display2:
    mov bp,4            
up2:
    rol ax,4
    mov qword[result1],rax
    and al,0fh
    cmp al,09h
    jbe next2
    add al,07h
next2:
    add al,30h
    mov byte[temp],al
    inout 1,1,temp,1
    mov rax,qword[result1]
    dec bp
    jnz up2
    ret

; code at home/desktop/21226
;10,13 represents next line    
;equ replaces the the code by that block
;bss block section size --> that does dynamic input thats not initialised

;input must be 16 numbers   eg 1231234567891479 
;codes to run the file are
;save file as abc.asm
;open the location and open folder in terminal where file is saved\
;type command    nams -f elf64 asgn7.asm
;type ls     
;check asgn1.o file is created or not
;type ld -o file asgn7.o
;type ls
;check in green the file is created or not
;type ./file and run