NetBSD-5.0.2/sys/arch/i386/i386/mem.c
/* $NetBSD: mem.c,v 1.70 2008/09/25 10:40:48 ad Exp $ */
/*-
* Copyright (c) 2008 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software written for The NetBSD Foundation
* by Andrew Doran.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
/*
* 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 1.70 2008/09/25 10:40:48 ad Exp $");
#include "opt_compat_netbsd.h"
#include "opt_compat_freebsd.h"
#include <sys/param.h>
#include <sys/buf.h>
#include <sys/systm.h>
#include <sys/uio.h>
#include <sys/kmem.h>
#include <sys/proc.h>
#include <sys/fcntl.h>
#include <sys/conf.h>
#include <sys/kauth.h>
#include <machine/cpu.h>
#include <uvm/uvm_extern.h>
#define DEV_IO 14 /* iopl for compat_10 */
extern char *vmmap; /* poor name! */
void *zeropage;
static kmutex_t mm_lock;
dev_type_open(mmopen);
dev_type_read(mmrw);
dev_type_ioctl(mmioctl);
dev_type_mmap(mmmmap);
const struct cdevsw mem_cdevsw = {
mmopen, nullclose, mmrw, mmrw, mmioctl,
nostop, notty, nopoll, mmmmap, nokqfilter, D_OTHER | D_MPSAFE,
};
int check_pa_acc(paddr_t, vm_prot_t);
/*ARGSUSED*/
int
mmopen(dev_t dev, int flag, int mode, struct lwp *l)
{
static bool again;
if (!again) {
/* XXX UNSAFE. Need an mmattach(). */
again = true;
mutex_init(&mm_lock, MUTEX_DEFAULT, IPL_NONE);
zeropage = kmem_zalloc(PAGE_SIZE, KM_SLEEP);
}
switch (minor(dev)) {
#if defined(COMPAT_10) || defined(COMPAT_FREEBSD)
/* This is done by i386_iopl(3) now. */
case DEV_IO:
if (flag & FWRITE) {
struct trapframe *fp;
int error;
error = kauth_authorize_machdep(l->l_cred,
KAUTH_MACHDEP_IOPL, NULL, NULL, NULL, NULL);
if (error)
return (error);
fp = curlwp->l_md.md_regs;
fp->tf_eflags |= PSL_IOPL;
}
break;
#else
(void) flag;
#endif
default:
break;
}
return (0);
}
/*ARGSUSED*/
int
mmrw(dev_t dev, struct uio *uio, int flags)
{
register vaddr_t o, v;
register int c;
register struct iovec *iov;
int error = 0;
vm_prot_t prot;
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;
}
switch (minor(dev)) {
case DEV_MEM:
/* lock against other uses of shared vmmap */
mutex_enter(&mm_lock);
v = uio->uio_offset;
prot = uio->uio_rw == UIO_READ ? VM_PROT_READ :
VM_PROT_WRITE;
error = check_pa_acc(uio->uio_offset, prot);
if (error) {
mutex_exit(&mm_lock);
break;
}
pmap_enter(pmap_kernel(), (vaddr_t)vmmap,
trunc_page(v), prot, PMAP_WIRED|prot);
pmap_update(pmap_kernel());
o = uio->uio_offset & PGOFSET;
c = min(uio->uio_resid, (int)(PAGE_SIZE - o));
error = uiomove((char *)vmmap + o, c, uio);
pmap_remove(pmap_kernel(), (vaddr_t)vmmap,
(vaddr_t)vmmap + PAGE_SIZE);
pmap_update(pmap_kernel());
mutex_exit(&mm_lock);
break;
case DEV_KMEM:
v = uio->uio_offset;
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);
}
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)
{
/*
* /dev/mem is the only one that makes sense through this
* interface. For /dev/kmem any physaddr we return here
* could be transient and hence incorrect or invalid at
* a later time. /dev/null just doesn't make any sense
* and /dev/zero is a hack that is handled via the default
* pager in mmap().
*/
if (minor(dev) != DEV_MEM)
return -1;
if (check_pa_acc(off, prot) != 0) {
return -1;
}
return x86_btop(off);
}