I am reading some code of Linux. The keyboard.S has something like
outb %al,$0x61
and
inb $0x61,%al
I think the pending 'b' means 'byte', but i still cannot find what these instructions mean.
I am reading some code of Linux. The keyboard.S has something like
outb %al,$0x61
and
inb $0x61,%al
I think the pending 'b' means 'byte', but i still cannot find what these instructions mean.
Yes, the out port and in port instructions can be encoded for 8 bits of data or 16 bits of data. The b indicates byte which is the 8 bit version.