1178172Simp/*- 2178172Simp * Copyright (c) 2004 Alan L. Cox <alc@cs.rice.edu> 3178172Simp * Copyright (c) 1982, 1986, 1991, 1993 4178172Simp * The Regents of the University of California. All rights reserved. 5178172Simp * (c) UNIX System Laboratories, Inc. 6178172Simp * All or some portions of this file are derived from material licensed 7178172Simp * to the University of California by American Telephone and Telegraph 8178172Simp * Co. or Unix System Laboratories, Inc. and are reproduced herein with 9178172Simp * the permission of UNIX System Laboratories, Inc. 10178172Simp * 11178172Simp * Redistribution and use in source and binary forms, with or without 12178172Simp * modification, are permitted provided that the following conditions 13178172Simp * are met: 14178172Simp * 1. Redistributions of source code must retain the above copyright 15178172Simp * notice, this list of conditions and the following disclaimer. 16178172Simp * 2. Redistributions in binary form must reproduce the above copyright 17178172Simp * notice, this list of conditions and the following disclaimer in the 18178172Simp * documentation and/or other materials provided with the distribution. 19266312Sian * 3. Neither the name of the University nor the names of its contributors 20178172Simp * may be used to endorse or promote products derived from this software 21178172Simp * without specific prior written permission. 22178172Simp * 23178172Simp * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24178172Simp * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25178172Simp * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26178172Simp * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27178172Simp * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28178172Simp * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29178172Simp * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30178172Simp * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31178172Simp * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32178172Simp * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33178172Simp * SUCH DAMAGE. 34178172Simp * 35206714Sjmallett * @(#)kern_subr.c 8.3 (Berkeley) 1/21/94 36178172Simp */ 37178172Simp 38178172Simp#include <sys/cdefs.h> 39178172Simp__FBSDID("$FreeBSD$"); 40178172Simp 41178172Simp#include <sys/param.h> 42253367Sae#include <sys/systm.h> 43178172Simp#include <sys/kernel.h> 44178172Simp#include <sys/lock.h> 45178172Simp#include <sys/mutex.h> 46178172Simp#include <sys/proc.h> 47178172Simp#include <sys/sf_buf.h> 48178172Simp#include <sys/uio.h> 49178172Simp 50178172Simp#include <vm/vm.h> 51178172Simp#include <vm/vm_page.h> 52206714Sjmallett#include <vm/vm_param.h> 53178172Simp 54208581Sgonzo#include <machine/cache.h> 55208581Sgonzo 56178172Simp/* 57206714Sjmallett * Implement uiomove(9) from physical memory using a combination 58206714Sjmallett * of the direct mapping and sf_bufs to reduce the creation and 59206714Sjmallett * destruction of ephemeral mappings. 60178172Simp */ 61178172Simpint 62178172Simpuiomove_fromphys(vm_page_t ma[], vm_offset_t offset, int n, struct uio *uio) 63178172Simp{ 64178172Simp struct sf_buf *sf; 65178172Simp struct thread *td = curthread; 66178172Simp struct iovec *iov; 67178172Simp void *cp; 68178172Simp vm_offset_t page_offset; 69206714Sjmallett vm_paddr_t pa; 70206714Sjmallett vm_page_t m; 71178172Simp size_t cnt; 72178172Simp int error = 0; 73178172Simp int save = 0; 74178172Simp 75178172Simp KASSERT(uio->uio_rw == UIO_READ || uio->uio_rw == UIO_WRITE, 76178172Simp ("uiomove_fromphys: mode")); 77178172Simp KASSERT(uio->uio_segflg != UIO_USERSPACE || uio->uio_td == curthread, 78178172Simp ("uiomove_fromphys proc")); 79178172Simp save = td->td_pflags & TDP_DEADLKTREAT; 80178172Simp td->td_pflags |= TDP_DEADLKTREAT; 81178172Simp while (n > 0 && uio->uio_resid) { 82178172Simp iov = uio->uio_iov; 83178172Simp cnt = iov->iov_len; 84178172Simp if (cnt == 0) { 85178172Simp uio->uio_iov++; 86178172Simp uio->uio_iovcnt--; 87178172Simp continue; 88178172Simp } 89178172Simp if (cnt > n) 90178172Simp cnt = n; 91178172Simp page_offset = offset & PAGE_MASK; 92206714Sjmallett cnt = ulmin(cnt, PAGE_SIZE - page_offset); 93206714Sjmallett m = ma[offset >> PAGE_SHIFT]; 94206714Sjmallett pa = VM_PAGE_TO_PHYS(m); 95217944Sjchandra if (MIPS_DIRECT_MAPPABLE(pa)) { 96206714Sjmallett sf = NULL; 97217944Sjchandra cp = (char *)MIPS_PHYS_TO_DIRECT(pa) + page_offset; 98208581Sgonzo /* 99208581Sgonzo * flush all mappings to this page, KSEG0 address first 100208581Sgonzo * in order to get it overwritten by correct data 101208581Sgonzo */ 102208581Sgonzo mips_dcache_wbinv_range((vm_offset_t)cp, cnt); 103208581Sgonzo pmap_flush_pvcache(m); 104206714Sjmallett } else { 105206714Sjmallett sf = sf_buf_alloc(m, 0); 106206714Sjmallett cp = (char *)sf_buf_kva(sf) + page_offset; 107206714Sjmallett } 108178172Simp switch (uio->uio_segflg) { 109178172Simp case UIO_USERSPACE: 110218195Smdf maybe_yield(); 111178172Simp if (uio->uio_rw == UIO_READ) 112178172Simp error = copyout(cp, iov->iov_base, cnt); 113178172Simp else 114178172Simp error = copyin(iov->iov_base, cp, cnt); 115178172Simp if (error) { 116206714Sjmallett if (sf != NULL) 117206714Sjmallett sf_buf_free(sf); 118178172Simp goto out; 119178172Simp } 120178172Simp break; 121178172Simp case UIO_SYSSPACE: 122178172Simp if (uio->uio_rw == UIO_READ) 123178172Simp bcopy(cp, iov->iov_base, cnt); 124178172Simp else 125178172Simp bcopy(iov->iov_base, cp, cnt); 126178172Simp break; 127178172Simp case UIO_NOCOPY: 128178172Simp break; 129178172Simp } 130206714Sjmallett if (sf != NULL) 131206714Sjmallett sf_buf_free(sf); 132208581Sgonzo else 133208581Sgonzo mips_dcache_wbinv_range((vm_offset_t)cp, cnt); 134178172Simp iov->iov_base = (char *)iov->iov_base + cnt; 135178172Simp iov->iov_len -= cnt; 136178172Simp uio->uio_resid -= cnt; 137178172Simp uio->uio_offset += cnt; 138178172Simp offset += cnt; 139178172Simp n -= cnt; 140178172Simp } 141178172Simpout: 142178172Simp if (save == 0) 143178172Simp td->td_pflags &= ~TDP_DEADLKTREAT; 144178172Simp return (error); 145178172Simp} 146