NetBSD-5.0.2/sys/arch/sparc64/sparc64/mem.c
/* $NetBSD: mem.c,v 1.34 2007/03/04 07:54:07 christos Exp $ */
/*
* 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 1.34 2007/03/04 07:54:07 christos Exp $");
#include <sys/param.h>
#include <sys/buf.h>
#include <sys/systm.h>
#include <sys/uio.h>
#include <sys/malloc.h>
#include <sys/proc.h>
#include <sys/conf.h>
#include <sys/msgbuf.h>
#include <machine/eeprom.h>
#include <machine/ctlreg.h>
#include <uvm/uvm_extern.h>
vaddr_t prom_vstart = 0xf000000;
vaddr_t prom_vend = 0xf0100000;
void *zeropage;
dev_type_read(mmrw);
dev_type_ioctl(mmioctl);
const struct cdevsw mem_cdevsw = {
nullopen, nullclose, mmrw, mmrw, mmioctl,
nostop, notty, nopoll, nommap, nokqfilter, D_OTHER
};
/*ARGSUSED*/
int
mmrw(dev, uio, flags)
dev_t dev;
struct uio *uio;
int flags;
{
vaddr_t o, v;
int c;
struct iovec *iov;
int error = 0;
static int physlock;
vm_prot_t prot;
extern void *vmmap;
vsize_t msgbufsz;
if (minor(dev) == DEV_MEM) {
/* lock against other uses of shared vmmap */
while (physlock > 0) {
physlock++;
error = tsleep((void *)&physlock, PZERO | PCATCH,
"mmrw", 0);
if (error)
return (error);
}
physlock = 1;
}
while (uio->uio_resid > 0 && error == 0) {
int n;
iov = uio->uio_iov;
if (iov->iov_len == 0) {
uio->uio_iov++;
uio->uio_iovcnt--;
if (uio->uio_iovcnt < 0)
panic("mmrw");
continue;
}
/* Note how much is still to go */
n = uio->uio_resid;
switch (minor(dev)) {
case DEV_MEM:
#if 1
v = uio->uio_offset;
if (!pmap_pa_exists(v)) {
error = EFAULT;
goto unlock;
}
prot = uio->uio_rw == UIO_READ ? VM_PROT_READ :
VM_PROT_WRITE;
pmap_enter(pmap_kernel(), (vaddr_t)vmmap,
trunc_page(v), prot, prot|PMAP_WIRED);
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());
break;
#else
/* On v9 we can just use the physical ASI and not bother w/mapin & mapout */
v = uio->uio_offset;
if (!pmap_pa_exists(v)) {
error = EFAULT;
goto unlock;
}
o = uio->uio_offset & PGOFSET;
c = min(uio->uio_resid, (int)(PAGE_SIZE - o));
/* However, we do need to partially re-implement uiomove() */
if (uio->uio_rw != UIO_READ && uio->uio_rw != UIO_WRITE)
panic("mmrw: uio mode");
if (uio->uio_segflg == UIO_USERSPACE && uio->uio_lwp != curlwp)
panic("mmrw: uio proc");
while (c > 0 && uio->uio_resid) {
struct iovec *iov;
u_int cnt;
int d;
iov = uio->uio_iov;
cnt = iov->iov_len;
if (cnt == 0) {
uio->uio_iov++;
uio->uio_iovcnt--;
continue;
}
if (cnt > c)
cnt = c;
d = iov->iov_base;
switch (uio->uio_segflg) {
case UIO_USERSPACE:
if (uio->uio_rw == UIO_READ)
while (cnt--)
if(subyte(d++, lduba(v++, ASI_PHYS_CACHED))) {
error = EFAULT;
goto unlock;
}
else
while (cnt--)
stba(v++, ASI_PHYS_CACHED, fubyte(d++));
if (error)
goto unlock;
break;
case UIO_SYSSPACE:
if (uio->uio_rw == UIO_READ)
while (cnt--)
stba(d++, ASI_P, lduba(v++, ASI_PHYS_CACHED));
else
while (cnt--)
stba(v++, ASI_PHYS_CACHED, lduba(d++, ASI_P));
break;
}
iov->iov_base = (void *)iov->iov_base + cnt;
iov->iov_len -= cnt;
uio->uio_resid -= cnt;
uio->uio_offset += cnt;
c -= cnt;
}
break;
#endif
case DEV_KMEM:
v = uio->uio_offset;
msgbufsz = msgbufp->msg_bufs +
offsetof(struct kern_msgbuf, msg_bufc);
if (v >= (vaddr_t)msgbufp &&
v < (vaddr_t)(msgbufp + msgbufsz)) {
c = min(iov->iov_len, msgbufsz);
#if 1 /* Don't know where PROMs are on Ultras. Think it's at f000000 */
} else if (v >= prom_vstart && v < prom_vend &&
uio->uio_rw == UIO_READ) {
/* Allow read-only access to the PROM */
c = min(iov->iov_len, prom_vend - prom_vstart);
#endif
} else {
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);
/* XXX should add sbus, etc */
case DEV_ZERO:
if (uio->uio_rw == UIO_WRITE) {
uio->uio_resid = 0;
return(0);
}
if (zeropage == NULL) {
zeropage = (void *)
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);
}
/* If we didn't make any progress (i.e. EOF), we're done here */
if (n == uio->uio_resid)
break;
}
if (minor(dev) == 0) {
unlock:
if (physlock > 1)
wakeup((void *)&physlock);
physlock = 0;
}
return (error);
}