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-rw-r--r--arch/ia64/lib/copy_page.S98
1 files changed, 98 insertions, 0 deletions
diff --git a/arch/ia64/lib/copy_page.S b/arch/ia64/lib/copy_page.S
new file mode 100644
index 000000000000..127d1d050d78
--- /dev/null
+++ b/arch/ia64/lib/copy_page.S
@@ -0,0 +1,98 @@
+/*
+ *
+ * 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>
+
+#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)