1 files changed, 101 insertions, 0 deletions
diff --git a/arch/ia64/lib/copy_page.S b/arch/ia64/lib/copy_page.S
new file mode 100644
index 000000000..176f857c5
--- /dev/null
+++ b/arch/ia64/lib/copy_page.S
@@ -0,0 +1,101 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ *
+ * Optimized version of the standard copy_page() function
+ *
+ * Inputs:
+ *	in0:	address of target page
+ *	in1:	address of source page
+ * Output:
+ *	no return value
+ *
+ * Copyright (C) 1999, 2001 Hewlett-Packard Co
+ *	Stephane Eranian <eranian@hpl.hp.com>
+ *	David Mosberger <davidm@hpl.hp.com>
+ *
+ * 4/06/01 davidm	Tuned to make it perform well both for cached and uncached copies.
+ */
+#include <asm/asmmacro.h>
+#include <asm/page.h>
+#include <asm/export.h>
+
+#define PIPE_DEPTH	3
+#define EPI		p[PIPE_DEPTH-1]
+
+#define lcount		r16
+#define saved_pr	r17
+#define saved_lc	r18
+#define saved_pfs	r19
+#define src1		r20
+#define src2		r21
+#define tgt1		r22
+#define tgt2		r23
+#define srcf		r24
+#define tgtf		r25
+#define tgt_last	r26
+
+#define Nrot		((8*PIPE_DEPTH+7)&~7)
+
+GLOBAL_ENTRY(copy_page)
+	.prologue
+	.save ar.pfs, saved_pfs
+	alloc saved_pfs=ar.pfs,3,Nrot-3,0,Nrot
+
+	.rotr t1[PIPE_DEPTH], t2[PIPE_DEPTH], t3[PIPE_DEPTH], t4[PIPE_DEPTH], \
+	      t5[PIPE_DEPTH], t6[PIPE_DEPTH], t7[PIPE_DEPTH], t8[PIPE_DEPTH]
+	.rotp p[PIPE_DEPTH]
+
+	.save ar.lc, saved_lc
+	mov saved_lc=ar.lc
+	mov ar.ec=PIPE_DEPTH
+
+	mov lcount=PAGE_SIZE/64-1
+	.save pr, saved_pr
+	mov saved_pr=pr
+	mov pr.rot=1<<16
+
+	.body
+
+	mov src1=in1
+	adds src2=8,in1
+	mov tgt_last = PAGE_SIZE
+	;;
+	adds tgt2=8,in0
+	add srcf=512,in1
+	mov ar.lc=lcount
+	mov tgt1=in0
+	add tgtf=512,in0
+	add tgt_last = tgt_last, in0
+	;;
+1:
+(p[0])	ld8 t1[0]=[src1],16
+(EPI)	st8 [tgt1]=t1[PIPE_DEPTH-1],16
+(p[0])	ld8 t2[0]=[src2],16
+(EPI)	st8 [tgt2]=t2[PIPE_DEPTH-1],16
+	cmp.ltu p6,p0 = tgtf, tgt_last
+	;;
+(p[0])	ld8 t3[0]=[src1],16
+(EPI)	st8 [tgt1]=t3[PIPE_DEPTH-1],16
+(p[0])	ld8 t4[0]=[src2],16
+(EPI)	st8 [tgt2]=t4[PIPE_DEPTH-1],16
+	;;
+(p[0])	ld8 t5[0]=[src1],16
+(EPI)	st8 [tgt1]=t5[PIPE_DEPTH-1],16
+(p[0])	ld8 t6[0]=[src2],16
+(EPI)	st8 [tgt2]=t6[PIPE_DEPTH-1],16
+	;;
+(p[0])	ld8 t7[0]=[src1],16
+(EPI)	st8 [tgt1]=t7[PIPE_DEPTH-1],16
+(p[0])	ld8 t8[0]=[src2],16
+(EPI)	st8 [tgt2]=t8[PIPE_DEPTH-1],16
+
+(p6)	lfetch [srcf], 64
+(p6)	lfetch [tgtf], 64
+	br.ctop.sptk.few 1b
+	;;
+	mov pr=saved_pr,0xffffffffffff0000	// restore predicates
+	mov ar.pfs=saved_pfs
+	mov ar.lc=saved_lc
+	br.ret.sptk.many rp
+END(copy_page)
+EXPORT_SYMBOL(copy_page)