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%MACRO IO 4 MOV RAX, %1 MOV RDI, %2 MOV RSI, %3 MOV RDX, %4 SYSCALL %ENDMACRO section .data isProtectedMode: dq "Protected Mode",0x0A len1: equ $-isProtectedMode isRealMode: dq "Real Mode", 0x0A len2: equ $-isRealMode section .bss GDTR: resq 1 GDT: resq 1 RESULT: resb 1 cnt: resb 1 section .text global _start _start: JMP l3 SMSW RAX BT RAX, 0 JC l1 JNC l2 l1: IO 01, 01, isProtectedMode, len1 JMP l3 l2: IO 01, 01, isRealMode, len2 l3: ;GDTR SGDT [GDT] MOV AX, word[GDT] CALL HexToASCII IO 01, 01, RESULT, 4 MOV RAX, 60 MOV RDI, 00 SYSCALL HexToASCII: MOV byte[cnt], 0x04 MOV RSI, RESULT continue: rol ax, 2 mov bl, al and bl, 0x0F cmp bl, 09H jbe lab add bl, 7H lab: add bl, 30H mov byte[RESULT], bl ADD RSI, 2 DEC byte[cnt] JNZ continue RET
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