Add an implementation of uiomove_fromphys() to sparc64. This
implementation could be characterized as a hybrid of the amd64 and i386 implementations. Specifically, the direct virtual-to-physical mapping is used if possible and sf_buf_alloc() is used if the direct map cannot.
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2020-12-20 02:59:44 +00:00
svn path=/head/; revision=127297
@ -104,6 +104,7 @@ sparc64/sparc64/tick.c standard
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sparc64/sparc64/tlb.c standard
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sparc64/sparc64/trap.c standard
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sparc64/sparc64/tsb.c standard
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sparc64/sparc64/uio_machdep.c standard
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sparc64/sparc64/vm_machdep.c standard
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#
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ukbdmap.h optional ukbd_dflt_keymap \
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146
sys/sparc64/sparc64/uio_machdep.c
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146
sys/sparc64/sparc64/uio_machdep.c
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@ -0,0 +1,146 @@
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/*
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* Copyright (c) 2004 Alan L. Cox <alc@cs.rice.edu>
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* Copyright (c) 1982, 1986, 1991, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)kern_subr.c 8.3 (Berkeley) 1/21/94
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/sf_buf.h>
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#include <sys/systm.h>
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#include <sys/uio.h>
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#include <vm/vm.h>
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#include <vm/vm_page.h>
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#include <vm/vm_param.h>
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#include <machine/tlb.h>
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/*
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* Implement uiomove(9) from physical memory using a combination
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* of the direct mapping and sf_bufs to reduce the creation and
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* destruction of ephemeral mappings.
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*/
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int
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uiomove_fromphys(vm_page_t ma[], vm_offset_t offset, int n, struct uio *uio)
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{
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struct sf_buf *sf;
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struct thread *td = curthread;
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struct iovec *iov;
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void *cp;
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vm_offset_t page_offset;
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vm_paddr_t pa;
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vm_page_t m;
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size_t cnt;
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int error = 0;
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int save = 0;
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KASSERT(uio->uio_rw == UIO_READ || uio->uio_rw == UIO_WRITE,
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("uiomove_fromphys: mode"));
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KASSERT(uio->uio_segflg != UIO_USERSPACE || uio->uio_td == curthread,
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("uiomove_fromphys proc"));
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if (td != NULL) {
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mtx_lock_spin(&sched_lock);
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save = td->td_flags & TDF_DEADLKTREAT;
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td->td_flags |= TDF_DEADLKTREAT;
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mtx_unlock_spin(&sched_lock);
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}
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while (n > 0 && uio->uio_resid) {
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iov = uio->uio_iov;
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cnt = iov->iov_len;
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if (cnt == 0) {
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uio->uio_iov++;
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uio->uio_iovcnt--;
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continue;
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}
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if (cnt > n)
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cnt = n;
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page_offset = offset & PAGE_MASK;
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cnt = min(cnt, PAGE_SIZE - page_offset);
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m = ma[offset >> PAGE_SHIFT];
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pa = VM_PAGE_TO_PHYS(m);
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if (m->md.color != DCACHE_COLOR(pa)) {
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sf = sf_buf_alloc(m);
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cp = (char *)sf_buf_kva(sf) + page_offset;
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} else {
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sf = NULL;
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cp = (char *)TLB_PHYS_TO_DIRECT(pa) + page_offset;
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}
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switch (uio->uio_segflg) {
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case UIO_USERSPACE:
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if (ticks - PCPU_GET(switchticks) >= hogticks)
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uio_yield();
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if (uio->uio_rw == UIO_READ)
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error = copyout(cp, iov->iov_base, cnt);
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else
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error = copyin(iov->iov_base, cp, cnt);
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if (error)
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goto out;
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break;
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case UIO_SYSSPACE:
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if (uio->uio_rw == UIO_READ)
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bcopy(cp, iov->iov_base, cnt);
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else
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bcopy(iov->iov_base, cp, cnt);
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break;
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case UIO_NOCOPY:
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break;
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}
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if (sf != NULL)
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sf_buf_free(sf);
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iov->iov_base = (char *)iov->iov_base + cnt;
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iov->iov_len -= cnt;
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uio->uio_resid -= cnt;
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uio->uio_offset += cnt;
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offset += cnt;
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n -= cnt;
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}
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out:
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if (td != NULL && save == 0) {
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mtx_lock_spin(&sched_lock);
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td->td_flags &= ~TDF_DEADLKTREAT;
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mtx_unlock_spin(&sched_lock);
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}
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return (error);
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}
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