Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
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.
OUTandINare instructions for transferring data between I/O ports. Those are a couple of links I found which provide a bit more information.As you mentioned, the
bis thebyteform of those instructions, which is appropriate since you’re using the lower byte ofax(al).