Author: oxygene Date: Tue Mar 1 08:23:49 2011 New Revision: 6415 URL: https://tracker.coreboot.org/trac/coreboot/changeset/6415
Log: libpayload: Implement ffs()
Signed-off-by: Patrick Georgi patrick.georgi@secunet.com Acked-by: Stefan Reinauer stefan.reinauer@coreboot.org
Added: trunk/payloads/libpayload/include/strings.h trunk/payloads/libpayload/libc/strings.c Modified: trunk/payloads/libpayload/libc/Makefile.inc
Added: trunk/payloads/libpayload/include/strings.h ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ trunk/payloads/libpayload/include/strings.h Tue Mar 1 08:23:49 2011 (r6415) @@ -0,0 +1,35 @@ +/* + * This file is part of the libpayload project. + * + * Copyright (C) 2011 secunet Security Networks AG + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#ifndef _STRINGS_H +#define _STRINGS_H + +int ffs(int i); + +#endif
Modified: trunk/payloads/libpayload/libc/Makefile.inc ============================================================================== --- trunk/payloads/libpayload/libc/Makefile.inc Tue Mar 1 08:13:10 2011 (r6414) +++ trunk/payloads/libpayload/libc/Makefile.inc Tue Mar 1 08:23:49 2011 (r6415) @@ -32,7 +32,7 @@ TARGETS-$(CONFIG_LIBC) += libc/memory.o libc/ctype.o libc/ipchecksum.o libc/lib.o TARGETS-$(CONFIG_LIBC) += libc/rand.o libc/time.o libc/exec.o TARGETS-$(CONFIG_LIBC) += libc/readline.o libc/getopt_long.o libc/sysinfo.o -TARGETS-$(CONFIG_LIBC) += libc/args.o +TARGETS-$(CONFIG_LIBC) += libc/args.o libc/strings.o
# should be moved to coreboot directory TARGETS-$(CONFIG_LAR) += libc/lar.o
Added: trunk/payloads/libpayload/libc/strings.c ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ trunk/payloads/libpayload/libc/strings.c Tue Mar 1 08:23:49 2011 (r6415) @@ -0,0 +1,40 @@ +/* + * This file is part of the libpayload project. + * + * Copyright (C) 2011 secunet Security Networks AG + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +int ffs(int i) +{ + int count = 1; + if (i == 0) return 0; + + while ((i & 1) != 1) { + i>>=1; + count++; + } + return count; +}