diff options
Diffstat (limited to 'sys/kern/kern_conf.c')
| -rw-r--r-- | sys/kern/kern_conf.c | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/sys/kern/kern_conf.c b/sys/kern/kern_conf.c index dbc7794..d1b4d86 100644 --- a/sys/kern/kern_conf.c +++ b/sys/kern/kern_conf.c @@ -43,6 +43,9 @@ static MALLOC_DEFINE(M_DEVT, "dev_t", "dev_t storage"); +/* Built at compile time from sys/conf/majors */ +extern unsigned char reserved_majors[256]; + /* * This is the number of hash-buckets. Experiements with 'real-life' * udev_t's show that a prime halfway between two powers of two works @@ -281,8 +284,18 @@ make_dev(struct cdevsw *devsw, int minor, uid_t uid, gid_t gid, int perms, const va_list ap; int i; - KASSERT(umajor(makeudev(devsw->d_maj, minor)) == devsw->d_maj, - ("Invalid minor (%d) in make_dev", minor)); + KASSERT((minor & ~0xffff00ff) == 0, + ("Invalid minor (0x%x) in make_dev", minor)); + + if (devsw->d_maj == MAJOR_AUTO) { + for (i = NUMCDEVSW - 1; i > 0; i--) + if (reserved_majors[i] != i) + break; + KASSERT(i > 0, ("Out of major numbers (%s)", devsw->d_name)); + printf("Allocating major#%d to \"%s\"\n", i, devsw->d_name); + devsw->d_maj = i; + reserved_majors[i] = i; + } if (!ready_for_devs) { printf("WARNING: Driver mistake: make_dev(%s) called before SI_SUB_DRIVERS\n", |
