Current Path : /sys/mips/mips/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
Current File : //sys/mips/mips/uio_machdep.c |
/*- * 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. * 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. * * @(#)kern_subr.c 8.3 (Berkeley) 1/21/94 */ #include <sys/cdefs.h> __FBSDID("$FreeBSD: release/9.1.0/sys/mips/mips/uio_machdep.c 218195 2011-02-02 16:35:10Z mdf $"); #include <sys/param.h> #include <sys/kernel.h> #include <sys/lock.h> #include <sys/mutex.h> #include <sys/proc.h> #include <sys/sf_buf.h> #include <sys/systm.h> #include <sys/uio.h> #include <vm/vm.h> #include <vm/vm_page.h> #include <vm/vm_param.h> #include <machine/cache.h> /* * Implement uiomove(9) from physical memory using a combination * of the direct mapping and sf_bufs to reduce the creation and * destruction of ephemeral mappings. */ int uiomove_fromphys(vm_page_t ma[], vm_offset_t offset, int n, struct uio *uio) { struct sf_buf *sf; struct thread *td = curthread; struct iovec *iov; void *cp; vm_offset_t page_offset; vm_paddr_t pa; vm_page_t m; size_t cnt; int error = 0; int save = 0; 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; 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 = ulmin(cnt, PAGE_SIZE - page_offset); m = ma[offset >> PAGE_SHIFT]; pa = VM_PAGE_TO_PHYS(m); if (MIPS_DIRECT_MAPPABLE(pa)) { sf = NULL; cp = (char *)MIPS_PHYS_TO_DIRECT(pa) + page_offset; /* * flush all mappings to this page, KSEG0 address first * in order to get it overwritten by correct data */ mips_dcache_wbinv_range((vm_offset_t)cp, cnt); pmap_flush_pvcache(m); } else { sf = sf_buf_alloc(m, 0); cp = (char *)sf_buf_kva(sf) + 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) { if (sf != NULL) sf_buf_free(sf); 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 (sf != NULL) sf_buf_free(sf); else mips_dcache_wbinv_range((vm_offset_t)cp, cnt); 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 (save == 0) td->td_pflags &= ~TDP_DEADLKTREAT; return (error); }