xref: /freebsd/sys/dev/mem/memdev.c (revision ce46e2059e16557a44be599f86de42c0e1a13220)
18ab2f5ecSMark Murray /*-
28ab2f5ecSMark Murray  * Copyright (c) 2004 Mark R V Murray
38ab2f5ecSMark Murray  * All rights reserved.
48ab2f5ecSMark Murray  *
58ab2f5ecSMark Murray  * Redistribution and use in source and binary forms, with or without
68ab2f5ecSMark Murray  * modification, are permitted provided that the following conditions
78ab2f5ecSMark Murray  * are met:
88ab2f5ecSMark Murray  * 1. Redistributions of source code must retain the above copyright
98ab2f5ecSMark Murray  *    notice, this list of conditions and the following disclaimer
108ab2f5ecSMark Murray  *    in this position and unchanged.
118ab2f5ecSMark Murray  * 2. Redistributions in binary form must reproduce the above copyright
128ab2f5ecSMark Murray  *    notice, this list of conditions and the following disclaimer in the
138ab2f5ecSMark Murray  *    documentation and/or other materials provided with the distribution.
148ab2f5ecSMark Murray  *
158ab2f5ecSMark Murray  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
168ab2f5ecSMark Murray  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
178ab2f5ecSMark Murray  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
188ab2f5ecSMark Murray  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
198ab2f5ecSMark Murray  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
208ab2f5ecSMark Murray  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
218ab2f5ecSMark Murray  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
228ab2f5ecSMark Murray  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
238ab2f5ecSMark Murray  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
248ab2f5ecSMark Murray  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
258ab2f5ecSMark Murray  *
268ab2f5ecSMark Murray  */
278ab2f5ecSMark Murray 
288ab2f5ecSMark Murray #include <sys/cdefs.h>
298ab2f5ecSMark Murray __FBSDID("$FreeBSD$");
308ab2f5ecSMark Murray 
318ab2f5ecSMark Murray #include <sys/param.h>
328ab2f5ecSMark Murray #include <sys/conf.h>
338ab2f5ecSMark Murray #include <sys/fcntl.h>
348ab2f5ecSMark Murray #include <sys/kernel.h>
358ab2f5ecSMark Murray #include <sys/lock.h>
368ab2f5ecSMark Murray #include <sys/malloc.h>
378ab2f5ecSMark Murray #include <sys/memrange.h>
388ab2f5ecSMark Murray #include <sys/module.h>
398ab2f5ecSMark Murray #include <sys/mutex.h>
408ab2f5ecSMark Murray #include <sys/proc.h>
418ab2f5ecSMark Murray #include <sys/signalvar.h>
428ab2f5ecSMark Murray #include <sys/systm.h>
438ab2f5ecSMark Murray #include <sys/uio.h>
448ab2f5ecSMark Murray 
458ab2f5ecSMark Murray #include <vm/vm.h>
468ab2f5ecSMark Murray #include <vm/pmap.h>
478ab2f5ecSMark Murray 
488ab2f5ecSMark Murray #include <machine/memdev.h>
498ab2f5ecSMark Murray 
508ab2f5ecSMark Murray static struct cdev *memdev, *kmemdev;
518ab2f5ecSMark Murray 
528ab2f5ecSMark Murray static struct cdevsw mem_cdevsw = {
538ab2f5ecSMark Murray 	.d_version =	D_VERSION,
548ab2f5ecSMark Murray 	.d_flags =	D_MEM|D_NEEDGIANT,
558ab2f5ecSMark Murray 	.d_open =	memopen,
568ab2f5ecSMark Murray 	.d_read =	memrw,
578ab2f5ecSMark Murray 	.d_write =	memrw,
588ab2f5ecSMark Murray 	.d_ioctl =	memioctl,
598ab2f5ecSMark Murray 	.d_mmap =	memmmap,
608ab2f5ecSMark Murray 	.d_name =	"mem",
618ab2f5ecSMark Murray };
628ab2f5ecSMark Murray 
638ab2f5ecSMark Murray /* ARGSUSED */
648ab2f5ecSMark Murray int
658ab2f5ecSMark Murray memopen(struct cdev *dev __unused, int flags, int fmt __unused,
668ab2f5ecSMark Murray     struct thread *td)
678ab2f5ecSMark Murray {
688ab2f5ecSMark Murray 	int error = 0;
698ab2f5ecSMark Murray 
708ab2f5ecSMark Murray 	if (flags & FWRITE)
718ab2f5ecSMark Murray 		error = securelevel_gt(td->td_ucred, 0);
728ab2f5ecSMark Murray 
738ab2f5ecSMark Murray 	return (error);
748ab2f5ecSMark Murray }
758ab2f5ecSMark Murray 
768ab2f5ecSMark Murray /* ARGSUSED */
778ab2f5ecSMark Murray static int
788ab2f5ecSMark Murray mem_modevent(module_t mod __unused, int type, void *data __unused)
798ab2f5ecSMark Murray {
808ab2f5ecSMark Murray 	switch(type) {
818ab2f5ecSMark Murray 	case MOD_LOAD:
828ab2f5ecSMark Murray 		if (bootverbose)
838ab2f5ecSMark Murray 			printf("mem: <memory>\n");
848ab2f5ecSMark Murray 		dev_mem_md_init(); /* Machine dependant bit */
858ab2f5ecSMark Murray 		memdev = make_dev(&mem_cdevsw, CDEV_MINOR_MEM,
868ab2f5ecSMark Murray 			UID_ROOT, GID_KMEM, 0640, "mem");
878ab2f5ecSMark Murray 		kmemdev = make_dev(&mem_cdevsw, CDEV_MINOR_KMEM,
888ab2f5ecSMark Murray 			UID_ROOT, GID_KMEM, 0640, "kmem");
898ab2f5ecSMark Murray 		break;
908ab2f5ecSMark Murray 
918ab2f5ecSMark Murray 	case MOD_UNLOAD:
928ab2f5ecSMark Murray 		destroy_dev(memdev);
938ab2f5ecSMark Murray 		destroy_dev(kmemdev);
948ab2f5ecSMark Murray 		break;
958ab2f5ecSMark Murray 
968ab2f5ecSMark Murray 	case MOD_SHUTDOWN:
978ab2f5ecSMark Murray 		break;
988ab2f5ecSMark Murray 
998ab2f5ecSMark Murray 	default:
1008ab2f5ecSMark Murray 		return(EOPNOTSUPP);
1018ab2f5ecSMark Murray 		break;
1028ab2f5ecSMark Murray 
1038ab2f5ecSMark Murray 	}
1048ab2f5ecSMark Murray 
1058ab2f5ecSMark Murray 	return (0);
1068ab2f5ecSMark Murray }
1078ab2f5ecSMark Murray 
1088ab2f5ecSMark Murray DEV_MODULE(mem, mem_modevent, NULL);
109ce46e205SMark Murray MODULE_VERSION(mem, 1);
110