cpukit/libdrvmgr/drvmgr_rw.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /* Driver Manager Read/Write Interface Implementation.
0004  *
0005  * COPYRIGHT (c) 2009 Cobham Gaisler AB.
0006  *
0007  * Redistribution and use in source and binary forms, with or without
0008  * modification, are permitted provided that the following conditions
0009  * are met:
0010  * 1. Redistributions of source code must retain the above copyright
0011  *    notice, this list of conditions and the following disclaimer.
0012  * 2. Redistributions in binary form must reproduce the above copyright
0013  *    notice, this list of conditions and the following disclaimer in the
0014  *    documentation and/or other materials provided with the distribution.
0015  *
0016  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0017  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0018  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0019  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0020  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0021  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0022  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0023  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0024  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0025  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0026  * POSSIBILITY OF SUCH DAMAGE.
0027  */
0028
0029 #include <string.h>
0030 #include <drvmgr/drvmgr.h>
0031
0032 /* Set a range of memory in 128 byte chunks.
0033  * This call will take 128 bytes for buffer on stack
0034  */
0035 void drvmgr_rw_memset(
0036     void *dstadr,
0037     int c,
0038     size_t n,
0039     void *a,
0040     drvmgr_wmem_arg wmem
0041     )
0042 {
0043     unsigned long long buf[16+1]; /* Extra bytes after data are reserved
0044                        * for optimizations by write_mem */
0045     int txlen;
0046     char *adr;
0047
0048     if (n <= 0)
0049         return;
0050
0051     if (n > sizeof(unsigned long long)*16)
0052         txlen = sizeof(unsigned long long)*16;
0053     else
0054         txlen = n;
0055
0056     memset(buf, c, txlen);
0057
0058     adr = dstadr;
0059     do {
0060         wmem(adr, (const void *)&buf[0], txlen, a);
0061         adr += txlen;
0062         n -= txlen;
0063
0064         /* next length to transmitt */
0065         if (n > 16*sizeof(unsigned long long))
0066             txlen = 16*sizeof(unsigned long long);
0067         else
0068             txlen = n;
0069     } while (n > 0);
0070 }