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   hacs98
   커널드라이브를 어셈블리어로 짤수있는가??

http://www.hackerschool.org/HS_Boards/zboard.php?AllArticle=true&no=37851 [복사]


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  Hit : 1009     Date : 2025/02/03 10:04


    
해킹잘하고싶다 ; serial 드라이버 초기화 함수
global init_serial
global serial_write_char

section .text

; void init_serial()
init_serial:
mov dx, 0x3F8 ; COM1 포트
mov al, 0x00
out dx, al ; Interrupt Disable Register = 0

mov dx, 0x3FB ; Line Control Register
mov al, 0x80
out dx, al ; DLAB (enable baud rate divisor)

mov dx, 0x3F8 ; Divisor Low Byte (baud rate)
mov al, 0x03 ; 38400 baud (divisor = 3)
out dx, al
mov dx, 0x3F9 ; Divisor High Byte
mov al, 0x00
out dx, al

mov dx, 0x3FB
mov al, 0x03 ; 8 bits, no parity, one stop bit
out dx, al

mov dx, 0x3FC ; FIFO Control Register
mov al, 0xC7 ; Enable FIFO, clear them, with 14-byte threshold
out dx, al

mov dx, 0x3FE ; Modem Control Register
mov al, 0x0B ; IRQs enabled, RTS/DSR set
out dx, al

ret

; void serial_write_char(char c)
; c is in AL
serial_write_char:
mov dx, 0x3F8 ; Wait until transmit buffer is empty
.wait:
in al, 0x3FD
test al, 0x20
jz .wait

mov dx, 0x3F8
out dx, al ; Write character
ret



extern void init_serial();
extern void serial_write_char(char c);

void kmain() {
init_serial();

char* msg = "Hello from assembly serial driver!\r\n";
for (int i = 0; msg[i] != '\0'; i++) {
serial_write_char(msg[i]);
}

while (1);
}		 2025/03/21