* Copyright (c) 1988 University of Utah.
* Copyright (c) 1982, 1986, 1990 The Regents of the University of California.
* This code is derived from software contributed to Berkeley by
* the Systems Programming Group of the University of Utah Computer
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* 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
* from: Utah $Hdr: mem.c 1.14 90/10/12$
* @(#)mem.c 7.5 (Berkeley) 5/7/91
#include "../include/cpu.h"
#include "vm/vm_statistics.h"
register struct iovec
*iov
;
while (uio
->uio_resid
> 0 && error
== 0) {
/* minor device 0 is physical memory */
/* allow reads only in RAM (except for DEBUG) */
if (v
>= 0xFFFFFFFC || v
< lowram
)
pmap_enter(pmap_kernel(), vmmap
, trunc_page(v
),
uio
->uio_rw
== UIO_READ
?
VM_PROT_READ
: VM_PROT_WRITE
, TRUE
);
o
= (int)uio
->uio_offset
& PGOFSET
;
c
= (u_int
)(NBPG
- ((int)iov
->iov_base
& PGOFSET
));
c
= MIN(c
, (u_int
)(NBPG
- o
));
c
= MIN(c
, (u_int
)iov
->iov_len
);
error
= uiomove((caddr_t
)&vmmap
[o
], (int)c
, uio
);
pmap_remove(pmap_kernel(), vmmap
, &vmmap
[NBPG
]);
/* minor device 1 is kernel memory */
c
= MIN(iov
->iov_len
, MAXPHYS
);
if (!kernacc((caddr_t
)uio
->uio_offset
, c
,
uio
->uio_rw
== UIO_READ
? B_READ
: B_WRITE
))
error
= uiomove((caddr_t
)uio
->uio_offset
, (int)c
, uio
);
/* minor device 2 is EOF/RATHOLE */
if (uio
->uio_rw
== UIO_WRITE
)
/* minor device 12 (/dev/zero) is source of nulls on read, rathole on write */
if (uio
->uio_rw
== UIO_WRITE
) {
malloc(CLBYTES
, M_TEMP
, M_WAITOK
);
c
= MIN(iov
->iov_len
, CLBYTES
);
error
= uiomove(zbuf
, (int)c
, uio
);