bill@chinet.chi.il.us (Bill Mitchell) (03/07/90)
Today I tried to get readclock.c working on my shiny new Zenith Turbosport 386 luggable, and I ran into some minix stuff which stumped me. readclock.c calls port_in(). port_in() is in lib/other/portio.c, and reads from /dev/port. I don't have a /dev/port. fs/table.c doesn't mention /dev/port. Am I missing something obvious here?
dcd@tc.fluke.COM (David Dyck) (03/08/90)
In article <1990Mar7.004337.9883@chinet.chi.il.us> bill@chinet.chi.il.us (Bill Mitchell) writes: >readclock.c calls port_in(). port_in() is in lib/other/portio.c, >and reads from /dev/port. I don't have a /dev/port. fs/table.c >doesn't mention /dev/port. Am I missing something obvious here? It's not 'obvious', but fs/table.c just defines the major device numbers and their associated task number. Note /dev/mem (task MEM) has major device 1. so, take a look under "#define MEM ..." in <minix/com.h> and see. #define MEM -4 /* /dev/ram, /dev/(k)mem and /dev/null class */ # define RAM_DEV 0 /* minor device for /dev/ram */ # define MEM_DEV 1 /* minor device for /dev/mem */ # define KMEM_DEV 2 /* minor devige for /dev/kmem */ # define NULL_DEV 3 /* minor device for /dev/null */ #if (CHIP == INTEL) # define PORT_DEV 4 /* minor device for /dev/port */ #endif See, PORT_DEV has minor device 4. I learned about /dev/port a while back when installing Bruce Evans' procted mode patches into the 1.3 kernel, but it's good to 'trace-through' the mapping of major/minor devices. David Dyck Domain: dcd@tc.fluke.COM