Differential D2199 Diff 4721 sys/arm64/arm64/uio_machdep.c

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sys/arm64/arm64/uio_machdep.c

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				/*-
				* 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);
				}