1 files changed, 35 insertions, 0 deletions
diff --git a/libkern/memset-386.s b/libkern/memset-386.s
new file mode 100644
index 00000000..dacb2f5f
--- /dev/null
+++ b/libkern/memset-386.s
@@ -0,0 +1,35 @@
+	TEXT	memset(SB),$0
+
+	CLD
+	MOVL	p+0(FP), DI
+	MOVBLZX	c+4(FP), AX
+	MOVL	n+8(FP), BX
+/*
+ * if not enough bytes, just copy
+ */
+	CMPL	BX, $9
+	JLS	c3
+/*
+ * build word in AX
+ */
+	MOVB	AL, AH
+	MOVL	AX, CX
+	SHLL	$16, CX
+	ORL	CX, AX
+/*
+ * copy whole longs
+ */
+c1:
+	MOVL	BX, CX
+	SHRL	$2, CX
+	ANDL	$3, BX
+	REP;	STOSL
+/*
+ * copy the rest, by bytes
+ */
+c3:
+	MOVL	BX, CX
+	REP;	STOSB
+ret:
+	MOVL	p+0(FP),AX
+	RET