NetBSD-5.0.2/sys/arch/sh3/sh3/mem.c
/* $NetBSD: mem.c,v 1.26 2007/03/04 06:00:41 christos 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/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: mem.c,v 1.26 2007/03/04 06:00:41 christos Exp $");
#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 <sys/kauth.h>
#include <uvm/uvm_extern.h>
void *zeropage;
bool __mm_mem_addr(paddr_t);
dev_type_read(mmrw);
dev_type_ioctl(mmioctl);
dev_type_mmap(mmmmap);
const struct cdevsw mem_cdevsw = {
nullopen, nullclose, mmrw, mmrw, mmioctl,
nostop, notty, nopoll, mmmmap, nokqfilter,
};
/*ARGSUSED*/
int
mmrw(dev_t dev, struct uio *uio, int flags)
{
struct iovec *iov;
vaddr_t v, o;
int 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)) {
kmemphys:
case DEV_MEM:
/* Physical address */
if (__mm_mem_addr(v)) {
o = v & PGOFSET;
c = min(uio->uio_resid, (int)(PAGE_SIZE - o));
error = uiomove((void *)SH3_PHYS_TO_P1SEG(v),
c, uio);
} else {
return (EFAULT);
}
break;
case DEV_KMEM:
/* P0 */
if (v < SH3_P1SEG_BASE)
return (EFAULT);
/* P1 */
if (v < SH3_P2SEG_BASE) {
v = SH3_P1SEG_TO_PHYS(v);
goto kmemphys;
}
/* P2 */
if (v < SH3_P3SEG_BASE)
return (EFAULT);
/* P3 */
c = min(iov->iov_len, MAXPHYS);
if (!uvm_kernacc((void *)v, c,
uio->uio_rw == UIO_READ ? B_READ : B_WRITE))
return (EFAULT);
error = uiomove((void *)v, c, uio);
break;
case DEV_NULL:
if (uio->uio_rw == UIO_WRITE)
uio->uio_resid = 0;
return (0);
case DEV_ZERO:
if (uio->uio_rw == UIO_WRITE) {
uio->uio_resid = 0;
return (0);
}
if (zeropage == NULL) {
zeropage = malloc(PAGE_SIZE, M_TEMP, M_WAITOK);
memset(zeropage, 0, PAGE_SIZE);
}
c = min(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 lwp *l = curlwp;
if (minor(dev) != DEV_MEM)
return (-1);
if (!__mm_mem_addr(off) && kauth_authorize_machdep(l->l_cred,
KAUTH_MACHDEP_UNMANAGEDMEM, NULL, NULL, NULL, NULL) != 0)
return (-1);
return (sh3_btop((paddr_t)off));
}
/*
* bool __mm_mem_addr(paddr_t pa):
* Check specified physical address is memory device.
*/
bool
__mm_mem_addr(paddr_t pa)
{
return ((atop(pa) < vm_physmem[0].start || PHYS_TO_VM_PAGE(pa) != NULL)
? true : false);
}