1 files changed, 54 insertions, 0 deletions
diff --git a/roms/skiboot/libc/string/memset.c b/roms/skiboot/libc/string/memset.c
new file mode 100644
index 000000000..f96a0231f
--- /dev/null
+++ b/roms/skiboot/libc/string/memset.c
@@ -0,0 +1,54 @@
+/******************************************************************************
+ * Copyright (c) 2004, 2008 IBM Corporation
+ * All rights reserved.
+ * This program and the accompanying materials
+ * are made available under the terms of the BSD License
+ * which accompanies this distribution, and is available at
+ * http://www.opensource.org/licenses/bsd-license.php
+ *
+ * Contributors:
+ *     IBM Corporation - initial implementation
+ *****************************************************************************/
+
+#define CACHE_LINE_SIZE 128
+
+#include <stddef.h>
+
+void *memset(void *dest, int c, size_t size);
+void *memset(void *dest, int c, size_t size)
+{
+	unsigned char *d = (unsigned char *)dest;
+	unsigned long big_c = 0;
+
+#if defined(__powerpc__) || defined(__powerpc64__)
+	if (size > CACHE_LINE_SIZE && c==0) {
+		while ((unsigned long long)d % CACHE_LINE_SIZE) {
+			*d++ = (unsigned char)c;
+			size--;
+		}
+		while (size >= CACHE_LINE_SIZE) {
+			asm volatile ("dcbz 0,%0\n" : : "r"(d) : "memory");
+			d+= CACHE_LINE_SIZE;
+			size-= CACHE_LINE_SIZE;
+		}
+	}
+#endif
+
+	if (c) {
+		big_c = c;
+		big_c |= (big_c << 8) | big_c;
+		big_c |= (big_c << 16) | big_c;
+		big_c |= (big_c << 32) | big_c;
+	}
+	while (size >= 8 && c == 0) {
+		*((unsigned long *)d) = big_c;
+		d+=8;
+		size-=8;
+	}
+
+	while (size-- > 0) {
+		*d++ = (unsigned char)c;
+	}
+
+	return dest;
+}