initial blackfin support

1 files changed, 74 insertions, 0 deletions

diff --git a/arch/blackfin/lib/lshrdi3.c b/arch/blackfin/lib/lshrdi3.c
new file mode 100644
index 0000000000..75f366575a
--- /dev/null
+++ b/arch/blackfin/lib/lshrdi3.c
@@ -0,0 +1,74 @@
+/*
+ * File:         arch/blackfin/lib/lshrdi3.c
+ * Based on:
+ * Author:
+ *
+ * Created:
+ * Description:
+ *
+ * Rev:          $Id: lshrdi3.c 2775 2007-02-21 13:58:44Z hennerich $
+ *
+ * Modified:
+ *               Copyright 2004-2006 Analog Devices Inc.
+ *
+ * Bugs:         Enter bugs at http://blackfin.uclinux.org/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#define BITS_PER_UNIT 8
+
+typedef int SItype __attribute__ ((mode(SI)));
+typedef unsigned int USItype __attribute__ ((mode(SI)));
+typedef int DItype __attribute__ ((mode(DI)));
+typedef int word_type __attribute__ ((mode(__word__)));
+
+struct DIstruct {
+	SItype high, low;
+};
+
+typedef union {
+	struct DIstruct s;
+	DItype ll;
+} DIunion;
+
+#ifdef CONFIG_ARITHMETIC_OPS_L1
+DItype __lshrdi3(DItype u, word_type b)__attribute__((l1_text));
+#endif
+
+DItype __lshrdi3(DItype u, word_type b)
+{
+	DIunion w;
+	word_type bm;
+	DIunion uu;
+
+	if (b == 0)
+		return u;
+
+	uu.ll = u;
+
+	bm = (sizeof(SItype) * BITS_PER_UNIT) - b;
+	if (bm <= 0) {
+		w.s.high = 0;
+		w.s.low = (USItype) uu.s.high >> -bm;
+	} else {
+		USItype carries = (USItype) uu.s.high << bm;
+		w.s.high = (USItype) uu.s.high >> b;
+		w.s.low = ((USItype) uu.s.low >> b) | carries;
+	}
+
+	return w.ll;
+}