1995-10-02 09:24:44 +00:00
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/*-
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* Parts Copyright (c) 1995 Terrence R. Lambert
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* Copyright (c) 1995 Julian R. Elischer
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Terrence R. Lambert.
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* 4. The name Terrence R. Lambert may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY Julian R. Elischer ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE TERRENCE R. LAMBERT BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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1999-08-08 00:34:00 +00:00
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* $Id: kern_conf.c,v 1.53 1999/07/20 21:51:12 green Exp $
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1995-10-02 09:24:44 +00:00
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*/
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#include <sys/param.h>
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1999-07-20 09:47:55 +00:00
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#include <sys/kernel.h>
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1995-10-02 10:15:40 +00:00
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#include <sys/systm.h>
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1998-06-07 17:13:14 +00:00
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#include <sys/module.h>
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1999-07-20 09:47:55 +00:00
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#include <sys/malloc.h>
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1995-10-02 09:24:44 +00:00
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#include <sys/conf.h>
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1995-12-21 20:09:46 +00:00
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#include <sys/vnode.h>
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1999-07-20 09:47:55 +00:00
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#include <sys/queue.h>
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#include <miscfs/specfs/specdev.h>
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1995-12-21 20:09:46 +00:00
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1999-05-31 11:29:30 +00:00
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#define cdevsw_ALLOCSTART (NUMCDEVSW/2)
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1995-12-21 20:09:46 +00:00
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1999-05-31 11:29:30 +00:00
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struct cdevsw *cdevsw[NUMCDEVSW];
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1995-12-21 20:09:46 +00:00
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1999-07-20 09:47:55 +00:00
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static int bmaj2cmaj[NUMCDEVSW];
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MALLOC_DEFINE(M_DEVT, "dev_t", "dev_t storage");
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#define DEVT_HASH 83
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#define DEVT_STASH 50
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static struct specinfo devt_stash[DEVT_STASH];
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static SLIST_HEAD(devt_hash_head, specinfo) dev_hash[DEVT_HASH];
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1999-05-07 10:11:40 +00:00
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1995-12-21 20:09:46 +00:00
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/*
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* Routine to convert from character to block device number.
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*
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* A minimal stub routine can always return NODEV.
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*/
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dev_t
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chrtoblk(dev_t dev)
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{
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struct cdevsw *cd;
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1999-05-08 06:40:31 +00:00
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if((cd = devsw(dev)) != NULL) {
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1998-07-04 22:30:26 +00:00
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if (cd->d_bmaj != -1)
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1999-07-17 19:57:25 +00:00
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return(makebdev(cd->d_bmaj,minor(dev)));
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1995-12-21 20:09:46 +00:00
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}
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return(NODEV);
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}
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1995-10-02 09:24:44 +00:00
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1999-05-31 11:29:30 +00:00
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struct cdevsw *
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devsw(dev_t dev)
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{
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return(cdevsw[major(dev)]);
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}
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struct cdevsw *
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bdevsw(dev_t dev)
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{
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1999-07-19 09:37:59 +00:00
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return(cdevsw[major(dev)]);
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1999-05-31 11:29:30 +00:00
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}
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/*
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* Add a cdevsw entry
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*/
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1998-07-04 22:30:26 +00:00
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int
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1999-05-31 11:29:30 +00:00
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cdevsw_add(struct cdevsw *newentry)
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1996-07-23 21:52:43 +00:00
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{
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Divorce "dev_t" from the "major|minor" bitmap, which is now called
udev_t in the kernel but still called dev_t in userland.
Provide functions to manipulate both types:
major() umajor()
minor() uminor()
makedev() umakedev()
dev2udev() udev2dev()
For now they're functions, they will become in-line functions
after one of the next two steps in this process.
Return major/minor/makedev to macro-hood for userland.
Register a name in cdevsw[] for the "filedescriptor" driver.
In the kernel the udev_t appears in places where we have the
major/minor number combination, (ie: a potential device: we
may not have the driver nor the device), like in inodes, vattr,
cdevsw registration and so on, whereas the dev_t appears where
we carry around a reference to a actual device.
In the future the cdevsw and the aliased-from vnode will be hung
directly from the dev_t, along with up to two softc pointers for
the device driver and a few houskeeping bits. This will essentially
replace the current "alias" check code (same buck, bigger bang).
A little stunt has been provided to try to catch places where the
wrong type is being used (dev_t vs udev_t), if you see something
not working, #undef DEVT_FASCIST in kern/kern_conf.c and see if
it makes a difference. If it does, please try to track it down
(many hands make light work) or at least try to reproduce it
as simply as possible, and describe how to do that.
Without DEVT_FASCIST I belive this patch is a no-op.
Stylistic/posixoid comments about the userland view of the <sys/*.h>
files welcome now, from userland they now contain the end result.
Next planned step: make all dev_t's refer to the same devsw[] which
means convert BLK's to CHR's at the perimeter of the vnodes and
other places where they enter the game (bootdev, mknod, sysctl).
1999-05-11 19:55:07 +00:00
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int i;
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static int setup;
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if (!setup) {
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1999-05-31 11:29:30 +00:00
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for (i = 0; i < NUMCDEVSW; i++)
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Divorce "dev_t" from the "major|minor" bitmap, which is now called
udev_t in the kernel but still called dev_t in userland.
Provide functions to manipulate both types:
major() umajor()
minor() uminor()
makedev() umakedev()
dev2udev() udev2dev()
For now they're functions, they will become in-line functions
after one of the next two steps in this process.
Return major/minor/makedev to macro-hood for userland.
Register a name in cdevsw[] for the "filedescriptor" driver.
In the kernel the udev_t appears in places where we have the
major/minor number combination, (ie: a potential device: we
may not have the driver nor the device), like in inodes, vattr,
cdevsw registration and so on, whereas the dev_t appears where
we carry around a reference to a actual device.
In the future the cdevsw and the aliased-from vnode will be hung
directly from the dev_t, along with up to two softc pointers for
the device driver and a few houskeeping bits. This will essentially
replace the current "alias" check code (same buck, bigger bang).
A little stunt has been provided to try to catch places where the
wrong type is being used (dev_t vs udev_t), if you see something
not working, #undef DEVT_FASCIST in kern/kern_conf.c and see if
it makes a difference. If it does, please try to track it down
(many hands make light work) or at least try to reproduce it
as simply as possible, and describe how to do that.
Without DEVT_FASCIST I belive this patch is a no-op.
Stylistic/posixoid comments about the userland view of the <sys/*.h>
files welcome now, from userland they now contain the end result.
Next planned step: make all dev_t's refer to the same devsw[] which
means convert BLK's to CHR's at the perimeter of the vnodes and
other places where they enter the game (bootdev, mknod, sysctl).
1999-05-11 19:55:07 +00:00
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if (!bmaj2cmaj[i])
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1999-07-20 09:47:55 +00:00
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bmaj2cmaj[i] = 254;
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Divorce "dev_t" from the "major|minor" bitmap, which is now called
udev_t in the kernel but still called dev_t in userland.
Provide functions to manipulate both types:
major() umajor()
minor() uminor()
makedev() umakedev()
dev2udev() udev2dev()
For now they're functions, they will become in-line functions
after one of the next two steps in this process.
Return major/minor/makedev to macro-hood for userland.
Register a name in cdevsw[] for the "filedescriptor" driver.
In the kernel the udev_t appears in places where we have the
major/minor number combination, (ie: a potential device: we
may not have the driver nor the device), like in inodes, vattr,
cdevsw registration and so on, whereas the dev_t appears where
we carry around a reference to a actual device.
In the future the cdevsw and the aliased-from vnode will be hung
directly from the dev_t, along with up to two softc pointers for
the device driver and a few houskeeping bits. This will essentially
replace the current "alias" check code (same buck, bigger bang).
A little stunt has been provided to try to catch places where the
wrong type is being used (dev_t vs udev_t), if you see something
not working, #undef DEVT_FASCIST in kern/kern_conf.c and see if
it makes a difference. If it does, please try to track it down
(many hands make light work) or at least try to reproduce it
as simply as possible, and describe how to do that.
Without DEVT_FASCIST I belive this patch is a no-op.
Stylistic/posixoid comments about the userland view of the <sys/*.h>
files welcome now, from userland they now contain the end result.
Next planned step: make all dev_t's refer to the same devsw[] which
means convert BLK's to CHR's at the perimeter of the vnodes and
other places where they enter the game (bootdev, mknod, sysctl).
1999-05-11 19:55:07 +00:00
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setup++;
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}
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1998-07-04 22:30:26 +00:00
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1999-05-31 11:29:30 +00:00
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if (newentry->d_maj < 0 || newentry->d_maj >= NUMCDEVSW) {
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printf("%s: ERROR: driver has bogus cdevsw->d_maj = %d\n",
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newentry->d_name, newentry->d_maj);
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return EINVAL;
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1998-07-04 22:30:26 +00:00
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}
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1996-07-23 21:52:43 +00:00
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1999-07-03 08:22:30 +00:00
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if (cdevsw[newentry->d_maj]) {
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printf("WARNING: \"%s\" is usurping \"%s\"'s cdevsw[]\n",
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newentry->d_name, cdevsw[newentry->d_maj]->d_name);
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}
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1999-05-31 11:29:30 +00:00
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cdevsw[newentry->d_maj] = newentry;
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1999-07-03 08:22:30 +00:00
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if (newentry->d_bmaj >= 0 && newentry->d_bmaj < NUMCDEVSW) {
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1999-07-20 09:47:55 +00:00
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if (bmaj2cmaj[newentry->d_bmaj] != 254) {
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1999-07-03 08:22:30 +00:00
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printf("WARNING: \"%s\" is usurping \"%s\"'s bmaj\n",
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newentry->d_name,
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cdevsw[bmaj2cmaj[newentry->d_bmaj]]->d_name);
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}
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1999-05-31 11:29:30 +00:00
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bmaj2cmaj[newentry->d_bmaj] = newentry->d_maj;
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1999-07-03 08:22:30 +00:00
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}
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1998-07-04 22:30:26 +00:00
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return 0;
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}
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1999-06-25 07:49:01 +00:00
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/*
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* Remove a cdevsw entry
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*/
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int
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cdevsw_remove(struct cdevsw *oldentry)
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{
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if (oldentry->d_maj < 0 || oldentry->d_maj >= NUMCDEVSW) {
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printf("%s: ERROR: driver has bogus cdevsw->d_maj = %d\n",
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oldentry->d_name, oldentry->d_maj);
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return EINVAL;
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}
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cdevsw[oldentry->d_maj] = NULL;
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if (oldentry->d_bmaj >= 0 && oldentry->d_bmaj < NUMCDEVSW)
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1999-08-08 00:34:00 +00:00
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bmaj2cmaj[oldentry->d_bmaj] = 254;
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1999-06-25 07:49:01 +00:00
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return 0;
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}
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1998-06-07 17:13:14 +00:00
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int
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1999-05-07 10:11:40 +00:00
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devsw_module_handler(module_t mod, int what, void* arg)
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1998-06-07 17:13:14 +00:00
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{
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1999-05-07 10:11:40 +00:00
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struct devsw_module_data* data = (struct devsw_module_data*) arg;
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1999-06-26 11:39:27 +00:00
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int error = 0;
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1998-06-07 17:13:14 +00:00
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switch (what) {
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case MOD_LOAD:
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1999-05-31 11:29:30 +00:00
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error = cdevsw_add(data->cdevsw);
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1999-03-23 21:11:47 +00:00
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if (!error && data->chainevh)
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error = data->chainevh(mod, what, data->chainarg);
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return error;
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1998-06-07 17:13:14 +00:00
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case MOD_UNLOAD:
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1999-03-23 21:11:47 +00:00
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if (data->chainevh) {
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error = data->chainevh(mod, what, data->chainarg);
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if (error)
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return error;
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}
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1999-06-26 11:39:27 +00:00
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cdevsw_remove(data->cdevsw);
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1999-03-23 21:11:47 +00:00
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return error;
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1998-06-07 17:13:14 +00:00
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}
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if (data->chainevh)
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return data->chainevh(mod, what, data->chainarg);
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else
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return 0;
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}
|
Divorce "dev_t" from the "major|minor" bitmap, which is now called
udev_t in the kernel but still called dev_t in userland.
Provide functions to manipulate both types:
major() umajor()
minor() uminor()
makedev() umakedev()
dev2udev() udev2dev()
For now they're functions, they will become in-line functions
after one of the next two steps in this process.
Return major/minor/makedev to macro-hood for userland.
Register a name in cdevsw[] for the "filedescriptor" driver.
In the kernel the udev_t appears in places where we have the
major/minor number combination, (ie: a potential device: we
may not have the driver nor the device), like in inodes, vattr,
cdevsw registration and so on, whereas the dev_t appears where
we carry around a reference to a actual device.
In the future the cdevsw and the aliased-from vnode will be hung
directly from the dev_t, along with up to two softc pointers for
the device driver and a few houskeeping bits. This will essentially
replace the current "alias" check code (same buck, bigger bang).
A little stunt has been provided to try to catch places where the
wrong type is being used (dev_t vs udev_t), if you see something
not working, #undef DEVT_FASCIST in kern/kern_conf.c and see if
it makes a difference. If it does, please try to track it down
(many hands make light work) or at least try to reproduce it
as simply as possible, and describe how to do that.
Without DEVT_FASCIST I belive this patch is a no-op.
Stylistic/posixoid comments about the userland view of the <sys/*.h>
files welcome now, from userland they now contain the end result.
Next planned step: make all dev_t's refer to the same devsw[] which
means convert BLK's to CHR's at the perimeter of the vnodes and
other places where they enter the game (bootdev, mknod, sysctl).
1999-05-11 19:55:07 +00:00
|
|
|
|
|
|
|
/*
|
|
|
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* dev_t and u_dev_t primitives
|
|
|
|
*/
|
|
|
|
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|
|
|
int
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|
|
|
major(dev_t x)
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|
|
|
{
|
1999-07-20 09:47:55 +00:00
|
|
|
if (x == NODEV)
|
|
|
|
return NOUDEV;
|
|
|
|
return((x->si_udev >> 8) & 0xff);
|
Divorce "dev_t" from the "major|minor" bitmap, which is now called
udev_t in the kernel but still called dev_t in userland.
Provide functions to manipulate both types:
major() umajor()
minor() uminor()
makedev() umakedev()
dev2udev() udev2dev()
For now they're functions, they will become in-line functions
after one of the next two steps in this process.
Return major/minor/makedev to macro-hood for userland.
Register a name in cdevsw[] for the "filedescriptor" driver.
In the kernel the udev_t appears in places where we have the
major/minor number combination, (ie: a potential device: we
may not have the driver nor the device), like in inodes, vattr,
cdevsw registration and so on, whereas the dev_t appears where
we carry around a reference to a actual device.
In the future the cdevsw and the aliased-from vnode will be hung
directly from the dev_t, along with up to two softc pointers for
the device driver and a few houskeeping bits. This will essentially
replace the current "alias" check code (same buck, bigger bang).
A little stunt has been provided to try to catch places where the
wrong type is being used (dev_t vs udev_t), if you see something
not working, #undef DEVT_FASCIST in kern/kern_conf.c and see if
it makes a difference. If it does, please try to track it down
(many hands make light work) or at least try to reproduce it
as simply as possible, and describe how to do that.
Without DEVT_FASCIST I belive this patch is a no-op.
Stylistic/posixoid comments about the userland view of the <sys/*.h>
files welcome now, from userland they now contain the end result.
Next planned step: make all dev_t's refer to the same devsw[] which
means convert BLK's to CHR's at the perimeter of the vnodes and
other places where they enter the game (bootdev, mknod, sysctl).
1999-05-11 19:55:07 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
int
|
|
|
|
minor(dev_t x)
|
|
|
|
{
|
1999-07-20 09:47:55 +00:00
|
|
|
if (x == NODEV)
|
|
|
|
return NOUDEV;
|
|
|
|
return(x->si_udev & 0xffff00ff);
|
Divorce "dev_t" from the "major|minor" bitmap, which is now called
udev_t in the kernel but still called dev_t in userland.
Provide functions to manipulate both types:
major() umajor()
minor() uminor()
makedev() umakedev()
dev2udev() udev2dev()
For now they're functions, they will become in-line functions
after one of the next two steps in this process.
Return major/minor/makedev to macro-hood for userland.
Register a name in cdevsw[] for the "filedescriptor" driver.
In the kernel the udev_t appears in places where we have the
major/minor number combination, (ie: a potential device: we
may not have the driver nor the device), like in inodes, vattr,
cdevsw registration and so on, whereas the dev_t appears where
we carry around a reference to a actual device.
In the future the cdevsw and the aliased-from vnode will be hung
directly from the dev_t, along with up to two softc pointers for
the device driver and a few houskeeping bits. This will essentially
replace the current "alias" check code (same buck, bigger bang).
A little stunt has been provided to try to catch places where the
wrong type is being used (dev_t vs udev_t), if you see something
not working, #undef DEVT_FASCIST in kern/kern_conf.c and see if
it makes a difference. If it does, please try to track it down
(many hands make light work) or at least try to reproduce it
as simply as possible, and describe how to do that.
Without DEVT_FASCIST I belive this patch is a no-op.
Stylistic/posixoid comments about the userland view of the <sys/*.h>
files welcome now, from userland they now contain the end result.
Next planned step: make all dev_t's refer to the same devsw[] which
means convert BLK's to CHR's at the perimeter of the vnodes and
other places where they enter the game (bootdev, mknod, sysctl).
1999-05-11 19:55:07 +00:00
|
|
|
}
|
|
|
|
|
1999-06-01 18:56:26 +00:00
|
|
|
dev_t
|
|
|
|
makebdev(int x, int y)
|
|
|
|
{
|
1999-07-19 09:37:59 +00:00
|
|
|
return (makedev(bmaj2cmaj[x], y));
|
1999-06-01 18:56:26 +00:00
|
|
|
}
|
|
|
|
|
Divorce "dev_t" from the "major|minor" bitmap, which is now called
udev_t in the kernel but still called dev_t in userland.
Provide functions to manipulate both types:
major() umajor()
minor() uminor()
makedev() umakedev()
dev2udev() udev2dev()
For now they're functions, they will become in-line functions
after one of the next two steps in this process.
Return major/minor/makedev to macro-hood for userland.
Register a name in cdevsw[] for the "filedescriptor" driver.
In the kernel the udev_t appears in places where we have the
major/minor number combination, (ie: a potential device: we
may not have the driver nor the device), like in inodes, vattr,
cdevsw registration and so on, whereas the dev_t appears where
we carry around a reference to a actual device.
In the future the cdevsw and the aliased-from vnode will be hung
directly from the dev_t, along with up to two softc pointers for
the device driver and a few houskeeping bits. This will essentially
replace the current "alias" check code (same buck, bigger bang).
A little stunt has been provided to try to catch places where the
wrong type is being used (dev_t vs udev_t), if you see something
not working, #undef DEVT_FASCIST in kern/kern_conf.c and see if
it makes a difference. If it does, please try to track it down
(many hands make light work) or at least try to reproduce it
as simply as possible, and describe how to do that.
Without DEVT_FASCIST I belive this patch is a no-op.
Stylistic/posixoid comments about the userland view of the <sys/*.h>
files welcome now, from userland they now contain the end result.
Next planned step: make all dev_t's refer to the same devsw[] which
means convert BLK's to CHR's at the perimeter of the vnodes and
other places where they enter the game (bootdev, mknod, sysctl).
1999-05-11 19:55:07 +00:00
|
|
|
dev_t
|
|
|
|
makedev(int x, int y)
|
|
|
|
{
|
1999-07-20 09:47:55 +00:00
|
|
|
struct specinfo *si;
|
|
|
|
udev_t udev;
|
|
|
|
int hash;
|
|
|
|
static int stashed;
|
|
|
|
|
|
|
|
udev = (x << 8) | y;
|
|
|
|
hash = udev % DEVT_HASH;
|
|
|
|
SLIST_FOREACH(si, &dev_hash[hash], si_hash) {
|
|
|
|
if (si->si_udev == udev)
|
|
|
|
return (si);
|
|
|
|
}
|
|
|
|
if (stashed >= DEVT_STASH) {
|
|
|
|
MALLOC(si, struct specinfo *, sizeof(*si), M_DEVT,
|
|
|
|
M_USE_RESERVE);
|
|
|
|
} else {
|
|
|
|
si = devt_stash + stashed++;
|
|
|
|
}
|
|
|
|
bzero(si, sizeof(*si));
|
|
|
|
si->si_udev = udev;
|
|
|
|
si->si_bsize_phys = DEV_BSIZE;
|
|
|
|
si->si_bsize_best = BLKDEV_IOSIZE;
|
|
|
|
si->si_bsize_max = MAXBSIZE;
|
|
|
|
SLIST_INSERT_HEAD(&dev_hash[hash], si, si_hash);
|
|
|
|
return (si);
|
Divorce "dev_t" from the "major|minor" bitmap, which is now called
udev_t in the kernel but still called dev_t in userland.
Provide functions to manipulate both types:
major() umajor()
minor() uminor()
makedev() umakedev()
dev2udev() udev2dev()
For now they're functions, they will become in-line functions
after one of the next two steps in this process.
Return major/minor/makedev to macro-hood for userland.
Register a name in cdevsw[] for the "filedescriptor" driver.
In the kernel the udev_t appears in places where we have the
major/minor number combination, (ie: a potential device: we
may not have the driver nor the device), like in inodes, vattr,
cdevsw registration and so on, whereas the dev_t appears where
we carry around a reference to a actual device.
In the future the cdevsw and the aliased-from vnode will be hung
directly from the dev_t, along with up to two softc pointers for
the device driver and a few houskeeping bits. This will essentially
replace the current "alias" check code (same buck, bigger bang).
A little stunt has been provided to try to catch places where the
wrong type is being used (dev_t vs udev_t), if you see something
not working, #undef DEVT_FASCIST in kern/kern_conf.c and see if
it makes a difference. If it does, please try to track it down
(many hands make light work) or at least try to reproduce it
as simply as possible, and describe how to do that.
Without DEVT_FASCIST I belive this patch is a no-op.
Stylistic/posixoid comments about the userland view of the <sys/*.h>
files welcome now, from userland they now contain the end result.
Next planned step: make all dev_t's refer to the same devsw[] which
means convert BLK's to CHR's at the perimeter of the vnodes and
other places where they enter the game (bootdev, mknod, sysctl).
1999-05-11 19:55:07 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
udev_t
|
|
|
|
dev2udev(dev_t x)
|
|
|
|
{
|
1999-07-20 09:47:55 +00:00
|
|
|
if (x == NODEV)
|
|
|
|
return NOUDEV;
|
|
|
|
return (x->si_udev);
|
Divorce "dev_t" from the "major|minor" bitmap, which is now called
udev_t in the kernel but still called dev_t in userland.
Provide functions to manipulate both types:
major() umajor()
minor() uminor()
makedev() umakedev()
dev2udev() udev2dev()
For now they're functions, they will become in-line functions
after one of the next two steps in this process.
Return major/minor/makedev to macro-hood for userland.
Register a name in cdevsw[] for the "filedescriptor" driver.
In the kernel the udev_t appears in places where we have the
major/minor number combination, (ie: a potential device: we
may not have the driver nor the device), like in inodes, vattr,
cdevsw registration and so on, whereas the dev_t appears where
we carry around a reference to a actual device.
In the future the cdevsw and the aliased-from vnode will be hung
directly from the dev_t, along with up to two softc pointers for
the device driver and a few houskeeping bits. This will essentially
replace the current "alias" check code (same buck, bigger bang).
A little stunt has been provided to try to catch places where the
wrong type is being used (dev_t vs udev_t), if you see something
not working, #undef DEVT_FASCIST in kern/kern_conf.c and see if
it makes a difference. If it does, please try to track it down
(many hands make light work) or at least try to reproduce it
as simply as possible, and describe how to do that.
Without DEVT_FASCIST I belive this patch is a no-op.
Stylistic/posixoid comments about the userland view of the <sys/*.h>
files welcome now, from userland they now contain the end result.
Next planned step: make all dev_t's refer to the same devsw[] which
means convert BLK's to CHR's at the perimeter of the vnodes and
other places where they enter the game (bootdev, mknod, sysctl).
1999-05-11 19:55:07 +00:00
|
|
|
}
|
|
|
|
|
1999-07-20 21:29:13 +00:00
|
|
|
udev_t
|
|
|
|
dev2budev(dev_t x)
|
|
|
|
{
|
1999-07-20 21:51:12 +00:00
|
|
|
if (x == NODEV)
|
1999-07-20 21:29:13 +00:00
|
|
|
return NOUDEV;
|
|
|
|
else
|
|
|
|
return makeudev(devsw(x)->d_bmaj, minor(x));
|
|
|
|
}
|
|
|
|
|
Divorce "dev_t" from the "major|minor" bitmap, which is now called
udev_t in the kernel but still called dev_t in userland.
Provide functions to manipulate both types:
major() umajor()
minor() uminor()
makedev() umakedev()
dev2udev() udev2dev()
For now they're functions, they will become in-line functions
after one of the next two steps in this process.
Return major/minor/makedev to macro-hood for userland.
Register a name in cdevsw[] for the "filedescriptor" driver.
In the kernel the udev_t appears in places where we have the
major/minor number combination, (ie: a potential device: we
may not have the driver nor the device), like in inodes, vattr,
cdevsw registration and so on, whereas the dev_t appears where
we carry around a reference to a actual device.
In the future the cdevsw and the aliased-from vnode will be hung
directly from the dev_t, along with up to two softc pointers for
the device driver and a few houskeeping bits. This will essentially
replace the current "alias" check code (same buck, bigger bang).
A little stunt has been provided to try to catch places where the
wrong type is being used (dev_t vs udev_t), if you see something
not working, #undef DEVT_FASCIST in kern/kern_conf.c and see if
it makes a difference. If it does, please try to track it down
(many hands make light work) or at least try to reproduce it
as simply as possible, and describe how to do that.
Without DEVT_FASCIST I belive this patch is a no-op.
Stylistic/posixoid comments about the userland view of the <sys/*.h>
files welcome now, from userland they now contain the end result.
Next planned step: make all dev_t's refer to the same devsw[] which
means convert BLK's to CHR's at the perimeter of the vnodes and
other places where they enter the game (bootdev, mknod, sysctl).
1999-05-11 19:55:07 +00:00
|
|
|
dev_t
|
|
|
|
udev2dev(udev_t x, int b)
|
|
|
|
{
|
1999-07-17 19:57:25 +00:00
|
|
|
switch (b) {
|
|
|
|
case 0:
|
|
|
|
return makedev(umajor(x), uminor(x));
|
|
|
|
case 1:
|
|
|
|
return makebdev(umajor(x), uminor(x));
|
|
|
|
default:
|
|
|
|
Debugger("udev2dev(...,X)");
|
|
|
|
return NODEV;
|
|
|
|
}
|
Divorce "dev_t" from the "major|minor" bitmap, which is now called
udev_t in the kernel but still called dev_t in userland.
Provide functions to manipulate both types:
major() umajor()
minor() uminor()
makedev() umakedev()
dev2udev() udev2dev()
For now they're functions, they will become in-line functions
after one of the next two steps in this process.
Return major/minor/makedev to macro-hood for userland.
Register a name in cdevsw[] for the "filedescriptor" driver.
In the kernel the udev_t appears in places where we have the
major/minor number combination, (ie: a potential device: we
may not have the driver nor the device), like in inodes, vattr,
cdevsw registration and so on, whereas the dev_t appears where
we carry around a reference to a actual device.
In the future the cdevsw and the aliased-from vnode will be hung
directly from the dev_t, along with up to two softc pointers for
the device driver and a few houskeeping bits. This will essentially
replace the current "alias" check code (same buck, bigger bang).
A little stunt has been provided to try to catch places where the
wrong type is being used (dev_t vs udev_t), if you see something
not working, #undef DEVT_FASCIST in kern/kern_conf.c and see if
it makes a difference. If it does, please try to track it down
(many hands make light work) or at least try to reproduce it
as simply as possible, and describe how to do that.
Without DEVT_FASCIST I belive this patch is a no-op.
Stylistic/posixoid comments about the userland view of the <sys/*.h>
files welcome now, from userland they now contain the end result.
Next planned step: make all dev_t's refer to the same devsw[] which
means convert BLK's to CHR's at the perimeter of the vnodes and
other places where they enter the game (bootdev, mknod, sysctl).
1999-05-11 19:55:07 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
int
|
|
|
|
uminor(udev_t dev)
|
|
|
|
{
|
|
|
|
return(dev & 0xffff00ff);
|
|
|
|
}
|
|
|
|
|
|
|
|
int
|
|
|
|
umajor(udev_t dev)
|
|
|
|
{
|
|
|
|
return((dev & 0xff00) >> 8);
|
|
|
|
}
|
|
|
|
|
|
|
|
udev_t
|
1999-07-17 18:43:50 +00:00
|
|
|
makeudev(int x, int y)
|
Divorce "dev_t" from the "major|minor" bitmap, which is now called
udev_t in the kernel but still called dev_t in userland.
Provide functions to manipulate both types:
major() umajor()
minor() uminor()
makedev() umakedev()
dev2udev() udev2dev()
For now they're functions, they will become in-line functions
after one of the next two steps in this process.
Return major/minor/makedev to macro-hood for userland.
Register a name in cdevsw[] for the "filedescriptor" driver.
In the kernel the udev_t appears in places where we have the
major/minor number combination, (ie: a potential device: we
may not have the driver nor the device), like in inodes, vattr,
cdevsw registration and so on, whereas the dev_t appears where
we carry around a reference to a actual device.
In the future the cdevsw and the aliased-from vnode will be hung
directly from the dev_t, along with up to two softc pointers for
the device driver and a few houskeeping bits. This will essentially
replace the current "alias" check code (same buck, bigger bang).
A little stunt has been provided to try to catch places where the
wrong type is being used (dev_t vs udev_t), if you see something
not working, #undef DEVT_FASCIST in kern/kern_conf.c and see if
it makes a difference. If it does, please try to track it down
(many hands make light work) or at least try to reproduce it
as simply as possible, and describe how to do that.
Without DEVT_FASCIST I belive this patch is a no-op.
Stylistic/posixoid comments about the userland view of the <sys/*.h>
files welcome now, from userland they now contain the end result.
Next planned step: make all dev_t's refer to the same devsw[] which
means convert BLK's to CHR's at the perimeter of the vnodes and
other places where they enter the game (bootdev, mknod, sysctl).
1999-05-11 19:55:07 +00:00
|
|
|
{
|
|
|
|
return ((x << 8) | y);
|
|
|
|
}
|
|
|
|
|