ECE 391 Lecture 5: Device IO

• School: University of Illinois
• Department: Electrical and Computer Engineering
• Course: ECE 391
• Professor: Kalbarczyk Zbigniew

Document Summary

Lecture topics x86 assembly wrap-up role of system software system calls, exceptions, & interrupts processor support for interrupts. Monday 02/06 students with last names starting with n to z. Tuesday 02/07 students with last names start with a to m you must be present at 6. pm with an mp1 grade sheet printed in order to handin. Ece 391 - lect page 1 byte addressable little-endian (looks like memory) instructions. Out src. reg, port the register operands are not general-purpose registers all data to/from al, ax, or eax port is either an 8 bit immediate not 16!) or dx. What is a port exactly? dedicated location in memory that can"t be accessed by any instruction other than in and out, processor can write/retrieve data. shx40, %al # want to transfer a byte, must use al in this case, no choice. Inw (), %ax # al