Εργαστήριο Λειτουργικών Συστημάτων Φροντιστήριο 6–Device Drivers Ντίρλης Νικόλαος

Device Drivers Operates Controls Hiding Details Enable users to use high level functions Example: Serial Port High Level Functions: (1) Send Data, (2) Receive Data Different low-level commands for UART or FTDI RS-232 standard compatible

Help Please? - Windows How difficult is to write a driver? Windows Driver Foundation: User-Mode Driver Framework (recommended, message-based) and Kernel- Mode Drivers Framework (standard implementations of functions that are known to cause problems, including cancellation of I/O operations, power management, and plug and play device)

Help Please? – Mac OS X is Not Unix Kernel I/O Kit subset of C++ (omits features that Apple feels are unsafe for use in a multithreaded kernel)

APIs Windows Display Driver Model (WDDM) – the graphic display driver architecture for Win Vista-7-8 Windows Driver Model (WDM) Network Driver Interface Specification (NDIS) – a standard network card driver API Advanced Linux Sound Architecture (ALSA) – as of 2009 the standard Linux sound-driver interface Scanner Access Now Easy (SANE) – a public-domain interface to raster-image scanner-hardware Installable File System (IFS) – a filesystem API for IBM OS/2 and Microsoft Windows NTfilesystem API Open Data-Link Interface (ODI) – a network card API similar to NDIS Uniform Driver Interface (UDI) – a cross-platform driver interface project Dynax Driver Framework (dxd) – C++ open source cross-platform driver framework for KMDF and I/O Kit

Others Firmware Embedded Systems

The Hello Driver usr/src/drivers/hello int main(int argc, char **argv) { sef_startup(); printf("Hello, World!\n"); return EXIT_SUCCESS; } make install

System Services cd etc vi system.conf /hello # service up /usr/sbin/hello # service down hello #cd dev #ls| grep hello