5 pcicfg16r(int fd, ushort *s, vlong offset)
9 if(pread(fd, buf, 2, offset) < 2) return -1;
10 *s = buf[0] | (buf[1] << 8);
24 fd = open("/dev/pci", OREAD);
25 if(fd < 0) sysfatal("open /dev/pci: %r");
26 n = dirreadall(fd, &dir);
27 if(n < 0) sysfatal("dirreadall /dev/pci: %r");
30 p = dir->name + strlen(dir->name) - 3;
31 if(strcmp(p, "raw") != 0)
33 s = smprint("/dev/pci/%s", dir->name);
36 fprint(2, "open %s: %r", s);
40 if(pcicfg16r(fd, &sh, 0) < 0) goto err;
41 if(sh == 0xFFFF) goto end;
42 if(pcicfg16r(fd, &sh, 0x06) < 0) goto err;
43 if((sh & (1<<4)) == 0) goto end;
46 if(pread(fd, &cap, 1, cap+1) < 0) goto err;
47 if(cap == 0) goto end;
48 if(pread(fd, &c, 1, cap) < 0) goto err;
55 fprint(2, "read %s: %r", s);