1 /* $NetBSD: criov.c,v 1.7 2009/03/14 21:04:26 dsl Exp $ */ 2 /* $OpenBSD: criov.c,v 1.11 2002/06/10 19:36:43 espie Exp $ */ 3 4 /* 5 * Copyright (c) 1999 Theo de Raadt 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. The name of the author may not be used to endorse or promote products 17 * derived from this software without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 __KERNEL_RCSID(0, "$NetBSD: criov.c,v 1.7 2009/03/14 21:04:26 dsl Exp $"); 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/proc.h> 37 #include <sys/errno.h> 38 #include <sys/malloc.h> 39 #include <sys/kernel.h> 40 #include <sys/mbuf.h> 41 42 #include <uvm/uvm_extern.h> 43 44 #include <opencrypto/cryptodev.h> 45 int cuio_getindx(struct uio *uio, int loc, int *off); 46 47 48 void 49 cuio_copydata(struct uio *uio, int off, int len, void *cp) 50 { 51 struct iovec *iov = uio->uio_iov; 52 int iol = uio->uio_iovcnt; 53 unsigned count; 54 55 if (off < 0) 56 panic("cuio_copydata: off %d < 0", off); 57 if (len < 0) 58 panic("cuio_copydata: len %d < 0", len); 59 while (off > 0) { 60 if (iol == 0) 61 panic("iov_copydata: empty in skip"); 62 if (off < iov->iov_len) 63 break; 64 off -= iov->iov_len; 65 iol--; 66 iov++; 67 } 68 while (len > 0) { 69 if (iol == 0) 70 panic("cuio_copydata: empty"); 71 count = min(iov->iov_len - off, len); 72 memcpy(cp, (char *)iov->iov_base + off, count); 73 len -= count; 74 cp = (char *)cp + count; 75 off = 0; 76 iol--; 77 iov++; 78 } 79 } 80 81 void 82 cuio_copyback(struct uio *uio, int off, int len, void *cp) 83 { 84 struct iovec *iov = uio->uio_iov; 85 int iol = uio->uio_iovcnt; 86 unsigned count; 87 88 if (off < 0) 89 panic("cuio_copyback: off %d < 0", off); 90 if (len < 0) 91 panic("cuio_copyback: len %d < 0", len); 92 while (off > 0) { 93 if (iol == 0) 94 panic("cuio_copyback: empty in skip"); 95 if (off < iov->iov_len) 96 break; 97 off -= iov->iov_len; 98 iol--; 99 iov++; 100 } 101 while (len > 0) { 102 if (iol == 0) 103 panic("uio_copyback: empty"); 104 count = min(iov->iov_len - off, len); 105 memcpy((char *)iov->iov_base + off, cp, count); 106 len -= count; 107 cp = (char *)cp + count; 108 off = 0; 109 iol--; 110 iov++; 111 } 112 } 113 114 /* 115 * Return a pointer to iov/offset of location in iovec list. 116 */ 117 118 int 119 cuio_getptr(struct uio *uio, int loc, int *off) 120 { 121 int ind, len; 122 123 ind = 0; 124 while (loc >= 0 && ind < uio->uio_iovcnt) { 125 len = uio->uio_iov[ind].iov_len; 126 if (len > loc) { 127 *off = loc; 128 return (ind); 129 } 130 loc -= len; 131 ind++; 132 } 133 134 if (ind > 0 && loc == 0) { 135 ind--; 136 *off = uio->uio_iov[ind].iov_len; 137 return (ind); 138 } 139 140 return (-1); 141 } 142 143 int 144 cuio_apply(struct uio *uio, int off, int len, 145 int (*f)(void *, void *, unsigned int), void *fstate) 146 { 147 int rval, ind, uiolen; 148 unsigned int count; 149 150 if (len < 0) 151 panic("%s: len %d < 0", __func__, len); 152 if (off < 0) 153 panic("%s: off %d < 0", __func__, off); 154 155 ind = 0; 156 while (off > 0) { 157 if (ind >= uio->uio_iovcnt) 158 panic("cuio_apply: out of ivecs before data in uio"); 159 uiolen = uio->uio_iov[ind].iov_len; 160 if (off < uiolen) 161 break; 162 off -= uiolen; 163 ind++; 164 } 165 while (len > 0) { 166 if (ind >= uio->uio_iovcnt) 167 panic("cuio_apply: out of ivecs when processing uio"); 168 count = min(uio->uio_iov[ind].iov_len - off, len); 169 170 rval = f(fstate, 171 ((char *)uio->uio_iov[ind].iov_base + off), count); 172 if (rval) 173 return (rval); 174 175 len -= count; 176 off = 0; 177 ind++; 178 } 179 180 return (0); 181 } 182