ref: c1d40df49550393f3afe53fb6e6d500dfa8eb7a8
dir: /sys/src/cmd/aux/realemu/pci.c/
#include <u.h> #include <libc.h> #include "dat.h" #include "fns.h" static Pcidev *devs; Pcidev* pciopen(int bdf) { char path[64]; Pcidev *pci; for(pci = devs; pci != nil; pci = pci->next){ if(pci->bdf == bdf){ if(pci->fd < 0) return nil; return pci; } } pci = malloc(sizeof(Pcidev)); pci->bdf = bdf; snprint(path, sizeof(path), "#$/pci/%d.%d.%draw", BDFBNO(bdf), BDFDNO(bdf), BDFFNO(bdf)); pci->fd = open(path, ORDWR); pci->next = devs; devs = pci; return pci; } int pcicfgr(Pcidev *pci, void *data, int len, int addr) { return pread(pci->fd, data, len, addr); } int pcicfgw(Pcidev *pci, void *data, int len, int addr) { return pwrite(pci->fd, data, len, addr); }