[unix-history] / sys / i386 / i386 / mem.c

/*-
 * Copyright (c) 1988 University of Utah.
 * Copyright (c) 1982, 1986, 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * the Systems Programming Group of the University of Utah Computer
 * Science Department, and code derived from software contributed to
 * Berkeley by William Jolitz.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	from: Utah $Hdr: mem.c 1.13 89/10/08$
 *	from: @(#)mem.c	7.2 (Berkeley) 5/9/91
 *	$Id$
 */

/*
 * Memory special file
 */

#include "param.h"
#include "conf.h"
#include "buf.h"
#include "systm.h"
#include "uio.h"
#include "malloc.h"
#include "proc.h"

#include "machine/cpu.h"
#include "machine/psl.h"

#include "vm/vm_param.h"
#include "vm/lock.h"
#include "vm/vm_statistics.h"
#include "vm/pmap.h"
#include "vm/vm_prot.h"

extern        char *vmmap;            /* poor name! */
/*ARGSUSED*/
mmclose(dev, uio, flags)
	dev_t dev;
	struct uio *uio;
	int flags;
{
	struct syscframe *fp;

	switch (minor(dev)) {
	case 14:
		fp = (struct syscframe *)curproc->p_regs;
		fp->sf_eflags &= ~PSL_IOPL;
		break;
	default:
		break;
	}
	return(0);
}
/*ARGSUSED*/
mmopen(dev, uio, flags)
	dev_t dev;
	struct uio *uio;
	int flags;
{
	struct syscframe *fp;

	switch (minor(dev)) {
	case 14:
		fp = (struct syscframe *)curproc->p_regs;
		fp->sf_eflags |= PSL_IOPL;
		break;
	default:
		break;
	}
	return(0);
}
/*ARGSUSED*/
mmrw(dev, uio, flags)
	dev_t dev;
	struct uio *uio;
	int flags;
{
	register int o;
	register u_int c, v;
	register struct iovec *iov;
	int error = 0;
	caddr_t zbuf = NULL;

	while (uio->uio_resid > 0 && error == 0) {
		iov = uio->uio_iov;
		if (iov->iov_len == 0) {
			uio->uio_iov++;
			uio->uio_iovcnt--;
			if (uio->uio_iovcnt < 0)
				panic("mmrw");
			continue;
		}
		switch (minor(dev)) {

/* minor device 0 is physical memory */
		case 0:
			v = uio->uio_offset;
			pmap_enter(pmap_kernel(), vmmap, v,
				uio->uio_rw == UIO_READ ? VM_PROT_READ : VM_PROT_WRITE,
				TRUE);
			o = (int)uio->uio_offset & PGOFSET;
			c = (u_int)(NBPG - ((int)iov->iov_base & PGOFSET));
			c = MIN(c, (u_int)(NBPG - o));
			c = MIN(c, (u_int)iov->iov_len);
			error = uiomove((caddr_t)&vmmap[o], (int)c, uio);
			pmap_remove(pmap_kernel(), vmmap, &vmmap[NBPG]);
			continue;

/* minor device 1 is kernel memory */
		case 1:
			c = iov->iov_len;
			if (!kernacc((caddr_t)uio->uio_offset, c,
			    uio->uio_rw == UIO_READ ? B_READ : B_WRITE))
				return(EFAULT);
			error = uiomove((caddr_t)uio->uio_offset, (int)c, uio);
			continue;

/* minor device 2 is EOF/RATHOLE */
		case 2:
			if (uio->uio_rw == UIO_READ)
				return (0);
			c = iov->iov_len;
			break;

/* minor device 12 (/dev/zero) is source of nulls on read, rathole on write */
		case 12:
			if (uio->uio_rw == UIO_WRITE) {
				c = iov->iov_len;
				break;
			}
			if (zbuf == NULL) {
				zbuf = (caddr_t)
				    malloc(CLBYTES, M_TEMP, M_WAITOK);
				bzero(zbuf, CLBYTES);
			}
			c = MIN(iov->iov_len, CLBYTES);
			error = uiomove(zbuf, (int)c, uio);
			continue;

#ifdef notyet
/* 386 I/O address space (/dev/ioport[bwl]) is a read/write access to seperate
   i/o device address bus, different than memory bus. Semantics here are
   very different than ordinary read/write, as if iov_len is a multiple
   an implied string move from a single port will be done. Note that lseek
   must be used to set the port number reliably. */
		case 14:
			if (iov->iov_len == 1) {
				u_char tmp;
				tmp = inb(uio->uio_offset);
				error = uiomove (&tmp, iov->iov_len, uio);
			} else {
				if (!useracc((caddr_t)iov->iov_base,
					iov->iov_len, uio->uio_rw))
					return (EFAULT);
				insb(uio->uio_offset, iov->iov_base,
					iov->iov_len);
			}
			break;
		case 15:
			if (iov->iov_len == sizeof (short)) {
				u_short tmp;
				tmp = inw(uio->uio_offset);
				error = uiomove (&tmp, iov->iov_len, uio);
			} else {
				if (!useracc((caddr_t)iov->iov_base,
					iov->iov_len, uio->uio_rw))
					return (EFAULT);
				insw(uio->uio_offset, iov->iov_base,
					iov->iov_len/ sizeof (short));
			}
			break;
		case 16:
			if (iov->iov_len == sizeof (long)) {
				u_long tmp;
				tmp = inl(uio->uio_offset);
				error = uiomove (&tmp, iov->iov_len, uio);
			} else {
				if (!useracc((caddr_t)iov->iov_base,
					iov->iov_len, uio->uio_rw))
					return (EFAULT);
				insl(uio->uio_offset, iov->iov_base,
					iov->iov_len/ sizeof (long));
			}
			break;
#endif

		default:
			return (ENXIO);
		}
		if (error)
			break;
		iov->iov_base += c;
		iov->iov_len -= c;
		uio->uio_offset += c;
		uio->uio_resid -= c;
	}
	if (zbuf)
		free(zbuf, M_TEMP);
	return (error);
}
Commit	Line	Data
15637ed4 RG	1	/*-
	2	* Copyright (c) 1988 University of Utah.
	3	* Copyright (c) 1982, 1986, 1990 The Regents of the University of California.
	4	* All rights reserved.
	5	*
	6	* This code is derived from software contributed to Berkeley by
	7	* the Systems Programming Group of the University of Utah Computer
	8	* Science Department, and code derived from software contributed to
	9	* Berkeley by William Jolitz.
	10	*
	11	* Redistribution and use in source and binary forms, with or without
	12	* modification, are permitted provided that the following conditions
	13	* are met:
	14	* 1. Redistributions of source code must retain the above copyright
	15	* notice, this list of conditions and the following disclaimer.
	16	* 2. Redistributions in binary form must reproduce the above copyright
	17	* notice, this list of conditions and the following disclaimer in the
	18	* documentation and/or other materials provided with the distribution.
	19	* 3. All advertising materials mentioning features or use of this software
	20	* must display the following acknowledgement:
	21	* This product includes software developed by the University of
	22	* California, Berkeley and its contributors.
	23	* 4. Neither the name of the University nor the names of its contributors
	24	* may be used to endorse or promote products derived from this software
	25	* without specific prior written permission.
	26	*
	27	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	28	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	29	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	30	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	31	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	32	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	33	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	34	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	35	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	36	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	37	* SUCH DAMAGE.
	38	*
78ed81a3	39	* from: Utah $Hdr: mem.c 1.13 89/10/08$
	40	* from: @(#)mem.c 7.2 (Berkeley) 5/9/91
	41	* $Id$
15637ed4 RG	42	*/
	43
	44	/*
	45	* Memory special file
	46	*/
	47
	48	#include "param.h"
	49	#include "conf.h"
	50	#include "buf.h"
	51	#include "systm.h"
	52	#include "uio.h"
	53	#include "malloc.h"
78ed81a3	54	#include "proc.h"
15637ed4 RG	55
15637ed4 RG	56	#include "machine/cpu.h"
78ed81a3	57	#include "machine/psl.h"
15637ed4 RG	58
	59	#include "vm/vm_param.h"
	60	#include "vm/lock.h"
	61	#include "vm/vm_statistics.h"
	62	#include "vm/pmap.h"
	63	#include "vm/vm_prot.h"
	64
	65	extern char vmmap; / poor name! */
	66	/ARGSUSED/
78ed81a3	67	mmclose(dev, uio, flags)
	68	dev_t dev;
	69	struct uio *uio;
	70	int flags;
	71	{
	72	struct syscframe *fp;
	73
	74	switch (minor(dev)) {
	75	case 14:
	76	fp = (struct syscframe *)curproc->p_regs;
	77	fp->sf_eflags &= ~PSL_IOPL;
	78	break;
	79	default:
	80	break;
	81	}
	82	return(0);
	83	}
	84	/ARGSUSED/
	85	mmopen(dev, uio, flags)
	86	dev_t dev;
	87	struct uio *uio;
	88	int flags;
	89	{
	90	struct syscframe *fp;
	91
	92	switch (minor(dev)) {
	93	case 14:
	94	fp = (struct syscframe *)curproc->p_regs;
	95	fp->sf_eflags \|= PSL_IOPL;
	96	break;
	97	default:
	98	break;
	99	}
	100	return(0);
	101	}
	102	/ARGSUSED/
15637ed4 RG	103	mmrw(dev, uio, flags)
	104	dev_t dev;
	105	struct uio *uio;
	106	int flags;
	107	{
	108	register int o;
	109	register u_int c, v;
	110	register struct iovec *iov;
	111	int error = 0;
	112	caddr_t zbuf = NULL;
	113
	114	while (uio->uio_resid > 0 && error == 0) {
	115	iov = uio->uio_iov;
	116	if (iov->iov_len == 0) {
	117	uio->uio_iov++;
	118	uio->uio_iovcnt--;
	119	if (uio->uio_iovcnt < 0)
	120	panic("mmrw");
	121	continue;
	122	}
	123	switch (minor(dev)) {
	124
	125	/* minor device 0 is physical memory */
	126	case 0:
	127	v = uio->uio_offset;
	128	pmap_enter(pmap_kernel(), vmmap, v,
	129	uio->uio_rw == UIO_READ ? VM_PROT_READ : VM_PROT_WRITE,
	130	TRUE);
	131	o = (int)uio->uio_offset & PGOFSET;
	132	c = (u_int)(NBPG - ((int)iov->iov_base & PGOFSET));
	133	c = MIN(c, (u_int)(NBPG - o));
	134	c = MIN(c, (u_int)iov->iov_len);
	135	error = uiomove((caddr_t)&vmmap[o], (int)c, uio);
	136	pmap_remove(pmap_kernel(), vmmap, &vmmap[NBPG]);
	137	continue;
	138
	139	/* minor device 1 is kernel memory */
	140	case 1:
	141	c = iov->iov_len;
	142	if (!kernacc((caddr_t)uio->uio_offset, c,
	143	uio->uio_rw == UIO_READ ? B_READ : B_WRITE))
	144	return(EFAULT);
	145	error = uiomove((caddr_t)uio->uio_offset, (int)c, uio);
	146	continue;
	147
	148	/* minor device 2 is EOF/RATHOLE */
	149	case 2:
	150	if (uio->uio_rw == UIO_READ)
	151	return (0);
	152	c = iov->iov_len;
	153	break;
	154
	155	/* minor device 12 (/dev/zero) is source of nulls on read, rathole on write */
	156	case 12:
	157	if (uio->uio_rw == UIO_WRITE) {
	158	c = iov->iov_len;
	159	break;
	160	}
	161	if (zbuf == NULL) {
	162	zbuf = (caddr_t)
	163	malloc(CLBYTES, M_TEMP, M_WAITOK);
	164	bzero(zbuf, CLBYTES);
	165	}
	166	c = MIN(iov->iov_len, CLBYTES);
167	error = uiomove(zbuf, (int)c, uio);
168	continue;
169
170	#ifdef notyet
171	/* 386 I/O address space (/dev/ioport[bwl]) is a read/write access to seperate
172	i/o device address bus, different than memory bus. Semantics here are
173	very different than ordinary read/write, as if iov_len is a multiple
174	an implied string move from a single port will be done. Note that lseek
175	must be used to set the port number reliably. */
176	case 14:
177	if (iov->iov_len == 1) {
178	u_char tmp;
179	tmp = inb(uio->uio_offset);
180	error = uiomove (&tmp, iov->iov_len, uio);
181	} else {
182	if (!useracc((caddr_t)iov->iov_base,
183	iov->iov_len, uio->uio_rw))
184	return (EFAULT);
185	insb(uio->uio_offset, iov->iov_base,
186	iov->iov_len);
187	}
188	break;
189	case 15:
190	if (iov->iov_len == sizeof (short)) {
191	u_short tmp;
192	tmp = inw(uio->uio_offset);
193	error = uiomove (&tmp, iov->iov_len, uio);
194	} else {
195	if (!useracc((caddr_t)iov->iov_base,
196	iov->iov_len, uio->uio_rw))
197	return (EFAULT);
198	insw(uio->uio_offset, iov->iov_base,
199	iov->iov_len/ sizeof (short));
200	}
201	break;
202	case 16:
203	if (iov->iov_len == sizeof (long)) {
204	u_long tmp;
205	tmp = inl(uio->uio_offset);
206	error = uiomove (&tmp, iov->iov_len, uio);
207	} else {
208	if (!useracc((caddr_t)iov->iov_base,
209	iov->iov_len, uio->uio_rw))
210	return (EFAULT);
211	insl(uio->uio_offset, iov->iov_base,
212	iov->iov_len/ sizeof (long));
213	}
214	break;
215	#endif
216
217	default:
218	return (ENXIO);
219	}
220	if (error)
221	break;
222	iov->iov_base += c;
223	iov->iov_len -= c;
224	uio->uio_offset += c;
225	uio->uio_resid -= c;
226	}
227	if (zbuf)
228	free(zbuf, M_TEMP);
229	return (error);
230	}