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11 lines
522 B
11 lines
522 B
global outb ; make the label outb visible outside this file |
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; outb - send a byte to an I/O port |
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; stack: [esp + 8] the data byte |
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; [esp + 4] the I/O port |
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; [esp ] return address |
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outb: |
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mov al, [esp + 8] ; move the data to be sent into the al register |
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mov dx, [esp + 4] ; move the address of the I/O port into the dx register |
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out dx, al ; send the data to the I/O port |
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ret ; return to the calling function
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