| 1 | /* $NetBSD: criov.c,v 1.8 2011/02/24 19:28:03 drochner 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 1.8 2011/02/24 19:28:03 drochner 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 | #ifdef DEBUG |
| 95 | printf("cuio_copyback: empty in skip\n" ); |
| 96 | #endif |
| 97 | return; |
| 98 | } |
| 99 | if (off < iov->iov_len) |
| 100 | break; |
| 101 | off -= iov->iov_len; |
| 102 | iol--; |
| 103 | iov++; |
| 104 | } |
| 105 | while (len > 0) { |
| 106 | if (iol == 0) { |
| 107 | #ifdef DEBUG |
| 108 | printf("uio_copyback: empty\n" ); |
| 109 | #endif |
| 110 | return; |
| 111 | } |
| 112 | count = min(iov->iov_len - off, len); |
| 113 | memcpy((char *)iov->iov_base + off, cp, count); |
| 114 | len -= count; |
| 115 | cp = (char *)cp + count; |
| 116 | off = 0; |
| 117 | iol--; |
| 118 | iov++; |
| 119 | } |
| 120 | } |
| 121 | |
| 122 | /* |
| 123 | * Return a pointer to iov/offset of location in iovec list. |
| 124 | */ |
| 125 | |
| 126 | int |
| 127 | cuio_getptr(struct uio *uio, int loc, int *off) |
| 128 | { |
| 129 | int ind, len; |
| 130 | |
| 131 | ind = 0; |
| 132 | while (loc >= 0 && ind < uio->uio_iovcnt) { |
| 133 | len = uio->uio_iov[ind].iov_len; |
| 134 | if (len > loc) { |
| 135 | *off = loc; |
| 136 | return (ind); |
| 137 | } |
| 138 | loc -= len; |
| 139 | ind++; |
| 140 | } |
| 141 | |
| 142 | if (ind > 0 && loc == 0) { |
| 143 | ind--; |
| 144 | *off = uio->uio_iov[ind].iov_len; |
| 145 | return (ind); |
| 146 | } |
| 147 | |
| 148 | return (-1); |
| 149 | } |
| 150 | |
| 151 | int |
| 152 | cuio_apply(struct uio *uio, int off, int len, |
| 153 | int (*f)(void *, void *, unsigned int), void *fstate) |
| 154 | { |
| 155 | int rval, ind, uiolen; |
| 156 | unsigned int count; |
| 157 | |
| 158 | if (len < 0) |
| 159 | panic("%s: len %d < 0" , __func__, len); |
| 160 | if (off < 0) |
| 161 | panic("%s: off %d < 0" , __func__, off); |
| 162 | |
| 163 | ind = 0; |
| 164 | while (off > 0) { |
| 165 | if (ind >= uio->uio_iovcnt) |
| 166 | panic("cuio_apply: out of ivecs before data in uio" ); |
| 167 | uiolen = uio->uio_iov[ind].iov_len; |
| 168 | if (off < uiolen) |
| 169 | break; |
| 170 | off -= uiolen; |
| 171 | ind++; |
| 172 | } |
| 173 | while (len > 0) { |
| 174 | if (ind >= uio->uio_iovcnt) |
| 175 | panic("cuio_apply: out of ivecs when processing uio" ); |
| 176 | count = min(uio->uio_iov[ind].iov_len - off, len); |
| 177 | |
| 178 | rval = f(fstate, |
| 179 | ((char *)uio->uio_iov[ind].iov_base + off), count); |
| 180 | if (rval) |
| 181 | return (rval); |
| 182 | |
| 183 | len -= count; |
| 184 | off = 0; |
| 185 | ind++; |
| 186 | } |
| 187 | |
| 188 | return (0); |
| 189 | } |
| 190 | |