kern_conf.c (66cdbc28d05df05a546dec9df3b2e4166e5fa4c4) kern_conf.c (ca916247cdab4aa84a7f00de7c39b9e8c933e581)
1/*-
2 * Copyright (c) 1999-2002 Poul-Henning Kamp
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright

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51 * udev_t's show that a prime halfway between two powers of two works
52 * best.
53 */
54#define DEVT_HASH 83
55
56/* The number of dev_t's we can create before malloc(9) kick in. */
57#define DEVT_STASH 50
58
1/*-
2 * Copyright (c) 1999-2002 Poul-Henning Kamp
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright

--- 42 unchanged lines hidden (view full) ---

51 * udev_t's show that a prime halfway between two powers of two works
52 * best.
53 */
54#define DEVT_HASH 83
55
56/* The number of dev_t's we can create before malloc(9) kick in. */
57#define DEVT_STASH 50
58
59static struct specinfo devt_stash[DEVT_STASH];
59static struct cdev devt_stash[DEVT_STASH];
60
60
61static LIST_HEAD(, specinfo) dev_hash[DEVT_HASH];
61static LIST_HEAD(, cdev) dev_hash[DEVT_HASH];
62
62
63static LIST_HEAD(, specinfo) dev_free;
63static LIST_HEAD(, cdev) dev_free;
64
65devfs_create_t *devfs_create_hook;
66devfs_destroy_t *devfs_destroy_hook;
67int devfs_present;
68
69static int ready_for_devs;
70
71static int free_devt;

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168 KASSERT(unit <= 0xffffff, ("Invalid unit (%d) in unit2minor", unit));
169 return ((unit & 0xff) | ((unit << 8) & ~0xffff));
170}
171
172static dev_t
173allocdev(void)
174{
175 static int stashed;
64
65devfs_create_t *devfs_create_hook;
66devfs_destroy_t *devfs_destroy_hook;
67int devfs_present;
68
69static int ready_for_devs;
70
71static int free_devt;

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168 KASSERT(unit <= 0xffffff, ("Invalid unit (%d) in unit2minor", unit));
169 return ((unit & 0xff) | ((unit << 8) & ~0xffff));
170}
171
172static dev_t
173allocdev(void)
174{
175 static int stashed;
176 struct specinfo *si;
176 struct cdev *si;
177
178 if (LIST_FIRST(&dev_free)) {
179 si = LIST_FIRST(&dev_free);
180 LIST_REMOVE(si, si_hash);
181 } else if (stashed >= DEVT_STASH) {
177
178 if (LIST_FIRST(&dev_free)) {
179 si = LIST_FIRST(&dev_free);
180 LIST_REMOVE(si, si_hash);
181 } else if (stashed >= DEVT_STASH) {
182 MALLOC(si, struct specinfo *, sizeof(*si), M_DEVT,
182 MALLOC(si, struct cdev *, sizeof(*si), M_DEVT,
183 M_USE_RESERVE | M_ZERO);
184 } else {
185 si = devt_stash + stashed++;
186 bzero(si, sizeof *si);
187 si->si_flags |= SI_STASHED;
188 }
189 LIST_INIT(&si->si_children);
190 TAILQ_INIT(&si->si_snapshots);
191 return (si);
192}
193
194dev_t
195makedev(int x, int y)
196{
183 M_USE_RESERVE | M_ZERO);
184 } else {
185 si = devt_stash + stashed++;
186 bzero(si, sizeof *si);
187 si->si_flags |= SI_STASHED;
188 }
189 LIST_INIT(&si->si_children);
190 TAILQ_INIT(&si->si_snapshots);
191 return (si);
192}
193
194dev_t
195makedev(int x, int y)
196{
197 struct specinfo *si;
197 struct cdev *si;
198 udev_t udev;
199 int hash;
200
201 if (x == umajor(NOUDEV) && y == uminor(NOUDEV))
202 panic("makedev of NOUDEV");
203 udev = (x << 8) | y;
204 hash = udev % DEVT_HASH;
205 LIST_FOREACH(si, &dev_hash[hash], si_hash) {

--- 279 unchanged lines hidden --- 		198 udev_t udev;
199 int hash;
200
201 if (x == umajor(NOUDEV) && y == uminor(NOUDEV))
202 panic("makedev of NOUDEV");
203 udev = (x << 8) | y;
204 hash = udev % DEVT_HASH;
205 LIST_FOREACH(si, &dev_hash[hash], si_hash) {

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