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head/sys/arm64/arm64/uio_machdep.c
Property | Old Value | New Value |
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svn:eol-style | null | native \ No newline at end of property |
svn:keywords | null | FreeBSD=%H \ No newline at end of property |
svn:mime-type | null | text/plain \ No newline at end of property |
/*- | |||||
* Copyright (c) 2004 Alan L. Cox <alc@cs.rice.edu> | |||||
* Copyright (c) 1982, 1986, 1991, 1993 | |||||
* The Regents of the University of California. All rights reserved. | |||||
* (c) UNIX System Laboratories, Inc. | |||||
* All or some portions of this file are derived from material licensed | |||||
* to the University of California by American Telephone and Telegraph | |||||
* Co. or Unix System Laboratories, Inc. and are reproduced herein with | |||||
* the permission of UNIX System Laboratories, Inc. | |||||
* | |||||
* 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. | |||||
* | |||||
* @(#)kern_subr.c 8.3 (Berkeley) 1/21/94 | |||||
*/ | |||||
#include <sys/cdefs.h> | |||||
__FBSDID("$FreeBSD$"); | |||||
#include <sys/param.h> | |||||
#include <sys/kernel.h> | |||||
#include <sys/lock.h> | |||||
#include <sys/mutex.h> | |||||
#include <sys/proc.h> | |||||
#include <sys/systm.h> | |||||
#include <sys/uio.h> | |||||
#include <vm/vm.h> | |||||
#include <vm/vm_page.h> | |||||
#include <machine/vmparam.h> | |||||
/* | |||||
* Implement uiomove(9) from physical memory using the direct map to | |||||
* avoid the creation and destruction of ephemeral mappings. | |||||
*/ | |||||
int | |||||
uiomove_fromphys(vm_page_t ma[], vm_offset_t offset, int n, struct uio *uio) | |||||
{ | |||||
struct thread *td = curthread; | |||||
struct iovec *iov; | |||||
void *cp; | |||||
vm_offset_t page_offset, vaddr; | |||||
size_t cnt; | |||||
int error = 0; | |||||
int save = 0; | |||||
boolean_t mapped; | |||||
KASSERT(uio->uio_rw == UIO_READ || uio->uio_rw == UIO_WRITE, | |||||
("uiomove_fromphys: mode")); | |||||
KASSERT(uio->uio_segflg != UIO_USERSPACE || uio->uio_td == curthread, | |||||
("uiomove_fromphys proc")); | |||||
save = td->td_pflags & TDP_DEADLKTREAT; | |||||
td->td_pflags |= TDP_DEADLKTREAT; | |||||
mapped = FALSE; | |||||
while (n > 0 && uio->uio_resid) { | |||||
iov = uio->uio_iov; | |||||
cnt = iov->iov_len; | |||||
if (cnt == 0) { | |||||
uio->uio_iov++; | |||||
uio->uio_iovcnt--; | |||||
continue; | |||||
} | |||||
if (cnt > n) | |||||
cnt = n; | |||||
page_offset = offset & PAGE_MASK; | |||||
cnt = min(cnt, PAGE_SIZE - page_offset); | |||||
if (uio->uio_segflg != UIO_NOCOPY) { | |||||
mapped = pmap_map_io_transient( | |||||
&ma[offset >> PAGE_SHIFT], &vaddr, 1, TRUE); | |||||
cp = (char *)vaddr + page_offset; | |||||
} | |||||
switch (uio->uio_segflg) { | |||||
case UIO_USERSPACE: | |||||
maybe_yield(); | |||||
if (uio->uio_rw == UIO_READ) | |||||
error = copyout(cp, iov->iov_base, cnt); | |||||
else | |||||
error = copyin(iov->iov_base, cp, cnt); | |||||
if (error) | |||||
goto out; | |||||
break; | |||||
case UIO_SYSSPACE: | |||||
if (uio->uio_rw == UIO_READ) | |||||
bcopy(cp, iov->iov_base, cnt); | |||||
else | |||||
bcopy(iov->iov_base, cp, cnt); | |||||
break; | |||||
case UIO_NOCOPY: | |||||
break; | |||||
} | |||||
if (__predict_false(mapped)) { | |||||
pmap_unmap_io_transient(&ma[offset >> PAGE_SHIFT], | |||||
&vaddr, 1, TRUE); | |||||
mapped = FALSE; | |||||
} | |||||
iov->iov_base = (char *)iov->iov_base + cnt; | |||||
iov->iov_len -= cnt; | |||||
uio->uio_resid -= cnt; | |||||
uio->uio_offset += cnt; | |||||
offset += cnt; | |||||
n -= cnt; | |||||
} | |||||
out: | |||||
if (__predict_false(mapped)) { | |||||
panic("TODO 3"); | |||||
pmap_unmap_io_transient(&ma[offset >> PAGE_SHIFT], &vaddr, 1, | |||||
TRUE); | |||||
} | |||||
if (save == 0) | |||||
td->td_pflags &= ~TDP_DEADLKTREAT; | |||||
return (error); | |||||
} |