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/* $OpenBSD: mem.c,v 1.8 2016/08/16 18:21:54 tedu Exp $ */
/* $NetBSD: mem.c,v 1.21 2006/07/23 22:06:07 ad Exp $ */
/*
* Copyright (c) 2002 The NetBSD Foundation, Inc.
* All rights reserved.
* Copyright (c) 1982, 1986, 1990, 1993
* 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.
*
* 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. 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.
*
* @(#)mem.c 8.3 (Berkeley) 1/12/94
*/
/*
* Copyright (c) 1988 University of Utah.
*
* This code is derived from software contributed to Berkeley by
* the Systems Programming Group of the University of Utah Computer
* Science Department.
*
* 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.
*
* @(#)mem.c 8.3 (Berkeley) 1/12/94
*/
/*
* Memory special file
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/buf.h>
#include <sys/uio.h>
#include <sys/malloc.h>
#include <sys/proc.h>
#include <sys/conf.h>
#include <uvm/uvm_extern.h>
caddr_t zeropage;
boolean_t __mm_mem_addr(paddr_t);
#define mmread mmrw
#define mmwrite mmrw
cdev_decl(mm);
int
mmopen(dev_t dev, int flag, int mode, struct proc *p)
{
switch (minor(dev)) {
case 0:
case 1:
case 2:
case 12:
break;
default:
return (ENXIO);
}
return (0);
}
int
mmclose(dev_t dev, int flag, int mode, struct proc *p)
{
return (0);
}
int
mmrw(dev_t dev, struct uio *uio, int flags)
{
struct iovec *iov;
vaddr_t v, o;
size_t c;
int error = 0;
while (uio->uio_resid > 0 && !error) {
iov = uio->uio_iov;
if (iov->iov_len == 0) {
uio->uio_iov++;
uio->uio_iovcnt--;
if (uio->uio_iovcnt < 0)
panic("mmrw");
continue;
}
v = uio->uio_offset;
switch (minor(dev)) {
case 0:
/* Physical address */
if (__mm_mem_addr(v)) {
o = v & PGOFSET;
c = ulmin(uio->uio_resid, PAGE_SIZE - o);
error = uiomove((caddr_t)SH3_PHYS_TO_P1SEG(v),
c, uio);
} else {
return (EFAULT);
}
break;
case 1:
if (v < SH3_P1SEG_BASE) /* P0 */
return (EFAULT);
if (v < SH3_P2SEG_BASE) { /* P1 */
/* permitted */
/*
if (__mm_mem_addr(SH3_P1SEG_TO_PHYS(v))
== FALSE)
return (EFAULT);
*/
c = ulmin(iov->iov_len, MAXPHYS);
error = uiomove((caddr_t)v, c, uio);
} else if (v < SH3_P3SEG_BASE) /* P2 */
return (EFAULT);
else { /* P3 */
c = ulmin(iov->iov_len, MAXPHYS);
if (!uvm_kernacc((void *)v, c,
uio->uio_rw == UIO_READ ? B_READ : B_WRITE))
return (EFAULT);
error = uiomove((caddr_t)v, c, uio);
}
break;
case 2:
if (uio->uio_rw == UIO_WRITE)
uio->uio_resid = 0;
return (0);
case 12:
if (uio->uio_rw == UIO_WRITE) {
uio->uio_resid = 0;
return (0);
}
if (zeropage == NULL)
zeropage = malloc(PAGE_SIZE, M_TEMP,
M_WAITOK | M_ZERO);
c = ulmin(iov->iov_len, PAGE_SIZE);
error = uiomove(zeropage, c, uio);
break;
default:
return (ENXIO);
}
}
return (error);
}
paddr_t
mmmmap(dev_t dev, off_t off, int prot)
{
struct proc *p = curproc;
if (minor(dev) != 0)
return (-1);
if (__mm_mem_addr((paddr_t)off) == FALSE && suser(p, 0) != 0)
return (-1);
return ((paddr_t)off);
}
int
mmioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct proc *p)
{
return (EOPNOTSUPP);
}
/*
* boolean_t __mm_mem_addr(paddr_t pa):
* Check specified physical address is in physical memory, with the
* kernel image off-limits.
*/
boolean_t
__mm_mem_addr(paddr_t pa)
{
#if 0
extern vaddr_t kernend; /* from machdep.c */
#endif
struct vm_physseg *seg;
unsigned int segno;
for (segno = 0, seg = vm_physmem; segno < vm_nphysseg; segno++, seg++) {
if (pa < seg->start || pa >= seg->end)
continue;
#if 0
/*
* This assumes the kernel image occupies the beginning of a
* memory segment.
*/
if (kernend >= seg->start && kernend < seg->end) {
if (pa < kernend)
return (FALSE);
}
#endif
return (TRUE);
}
return (FALSE);
}
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