/*-
* 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.
* 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
* $FreeBSD$
*/
/*
* Memory special file
*/
#include <sys/param.h>
#include <sys/conf.h>
#include <sys/fcntl.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/memrange.h>
#include <sys/msgbuf.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <sys/signalvar.h>
#include <sys/systm.h>
#include <sys/uio.h>
#include <machine/cpu.h>
#include <machine/frame.h>
#ifdef PERFMON
#include <machine/perfmon.h>
#endif
#include <vm/vm.h>
#include <vm/pmap.h>
#include <vm/vm_extern.h>
static dev_t memdev, kmemdev;
#ifdef PERFMON
static dev_t perfdev;
#endif /* PERFMON */
static d_open_t mmopen;
static d_close_t mmclose;
static d_read_t mmrw;
static d_ioctl_t mmioctl;
static d_mmap_t memmmap;
#define CDEV_MAJOR 2
static struct cdevsw mem_cdevsw = {
.d_version = D_VERSION,
.d_open = mmopen,
.d_close = mmclose,
.d_read = mmrw,
.d_write = mmrw,
.d_ioctl = mmioctl,
.d_mmap = memmmap,
.d_name = "mem",
.d_maj = CDEV_MAJOR,
.d_flags = D_MEM | D_NEEDGIANT,
};
struct mem_range_softc mem_range_softc;
static __inline int
ia64_pa_access(vm_offset_t pa)
{
return (VM_PROT_READ|VM_PROT_WRITE);
}
static int
mmclose(dev_t dev, int flags, int fmt, struct thread *td)
{
switch (minor(dev)) {
#ifdef PERFMON
case 32:
return perfmon_close(dev, flags, fmt, td);
#endif
default:
break;
}
return (0);
}
static int
mmopen(dev_t dev, int flags, int fmt, struct thread *td)
{
int error;
switch (minor(dev)) {
case 0:
case 1:
if (flags & FWRITE) {
error = securelevel_gt(td->td_ucred, 0);
if (error)
return error;
}
break;
case 32:
#ifdef PERFMON
return perfmon_open(dev, flags, fmt, td);
#else
return ENODEV;
#endif
default:
break;
}
return (0);
}
/*ARGSUSED*/
static int
mmrw(dev_t dev, struct uio *uio, int flags)
{
struct iovec *iov;
vm_offset_t addr, eaddr, o, v;
int c, error, rw;
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;
}
switch (minor(dev)) {
/* minor device 0 is physical memory */
case 0:
v = uio->uio_offset;
kmemphys:
/* Allow reads only in RAM. */
rw = (uio->uio_rw == UIO_READ)
? VM_PROT_READ : VM_PROT_WRITE;
if ((ia64_pa_access(v) & rw) != rw) {
error = EFAULT;
c = 0;
break;
}
o = uio->uio_offset & PAGE_MASK;
c = min(uio->uio_resid, (int)(PAGE_SIZE - o));
error = uiomove((caddr_t)IA64_PHYS_TO_RR7(v), c, uio);
continue;
/* minor device 1 is kernel memory */
case 1:
v = uio->uio_offset;
if (v >= IA64_RR_BASE(6)) {
v = IA64_RR_MASK(v);
goto kmemphys;
}
c = min(iov->iov_len, MAXPHYS);
/*
* Make sure that all of the pages are currently
* resident so that we don't create any zero-fill
* pages.
*/
addr = trunc_page(v);
eaddr = round_page(v + c);
for (; addr < eaddr; addr += PAGE_SIZE) {
if (pmap_extract(kernel_pmap, addr) == 0)
return (EFAULT);
}
if (!kernacc((caddr_t)v, c, (uio->uio_rw == UIO_READ)
? VM_PROT_READ : VM_PROT_WRITE))
return (EFAULT);
error = uiomove((caddr_t)v, c, uio);
continue;
default:
return (ENODEV);
}
if (error)
break;
iov->iov_base = (char *)iov->iov_base + c;
iov->iov_len -= c;
uio->uio_offset += c;
uio->uio_resid -= c;
}
return (error);
}
/*******************************************************\
* allow user processes to MMAP some memory sections *
* instead of going through read/write *
\*******************************************************/
static int
memmmap(dev_t dev, vm_offset_t offset, vm_paddr_t *paddr, 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.
*/
if (minor(dev) != 0)
return (-1);
/*
* Allow access only in RAM.
*/
if ((prot & ia64_pa_access(atop((vm_offset_t)offset))) != prot)
return (-1);
*paddr = IA64_PHYS_TO_RR7(offset);
return (0);
}
static int
mmioctl(dev_t dev, u_long cmd, caddr_t cmdarg, int flags, struct thread *td)
{
switch(minor(dev)) {
#ifdef PERFMON
case 32:
return perfmon_ioctl(dev, cmd, cmdarg, flags, td);
#endif
default:
return ENODEV;
}
return (0);
}
static int
mem_modevent(module_t mod, int type, void *data)
{
switch(type) {
case MOD_LOAD:
if (bootverbose)
printf("mem: <memory & I/O>\n");
/* XXX - ??? */
#if 0
/* Initialise memory range handling */
if (mem_range_softc.mr_op != NULL)
mem_range_softc.mr_op->init(&mem_range_softc);
#endif
memdev = make_dev(&mem_cdevsw, 0, UID_ROOT, GID_KMEM,
0640, "mem");
kmemdev = make_dev(&mem_cdevsw, 1, UID_ROOT, GID_KMEM,
0640, "kmem");
#ifdef PERFMON
perfdev = make_dev(&mem_cdevsw, 32, UID_ROOT, GID_KMEM,
0640, "perfmon");
#endif /* PERFMON */
return 0;
case MOD_UNLOAD:
destroy_dev(memdev);
destroy_dev(kmemdev);
#ifdef PERFMON
destroy_dev(perfdev);
#endif /* PERFMON */
return 0;
case MOD_SHUTDOWN:
return 0;
default:
return EOPNOTSUPP;
}
}
DEV_MODULE(mem, mem_modevent, NULL);
