1 files changed, 88 insertions, 0 deletions
diff --git a/arch/s390/lib/mem64.S b/arch/s390/lib/mem64.S
new file mode 100644
index 000000000000..c6d553e85ab1
--- /dev/null
+++ b/arch/s390/lib/mem64.S
@@ -0,0 +1,88 @@
+/*
+ * String handling functions.
+ *
+ * Copyright IBM Corp. 2012
+ */
+#include <linux/linkage.h>
+/*
+ * memset implementation
+ *
+ * This code corresponds to the C construct below. We do distinguish
+ * between clearing (c == 0) and setting a memory array (c != 0) simply
+ * because nearly all memset invocations in the kernel clear memory and
+ * the xc instruction is preferred in such cases.
+ *
+ * void *memset(void *s, int c, size_t n)
+ * {
+ *      if (likely(c == 0))
+ *              return __builtin_memset(s, 0, n);
+ *      return __builtin_memset(s, c, n);
+ * }
+ */
+ENTRY(memset)
+        ltgr    %r4,%r4
+        bzr     %r14
+        ltgr    %r3,%r3
+        jnz     .Lmemset_fill
+        aghi    %r4,-1
+        srlg    %r3,%r4,8
+        ltgr    %r3,%r3
+        lgr     %r1,%r2
+        jz      .Lmemset_clear_rest
+.Lmemset_clear_loop:
+        xc      0(256,%r1),0(%r1)
+        la      %r1,256(%r1)
+        brctg   %r3,.Lmemset_clear_loop
+.Lmemset_clear_rest:
+        larl    %r3,.Lmemset_xc
+        ex      %r4,0(%r3)
+        br      %r14
+.Lmemset_fill:
+        stc     %r3,0(%r2)
+        cghi    %r4,1
+        lgr     %r1,%r2
+        ber     %r14
+        aghi    %r4,-2
+        srlg    %r3,%r4,8
+        ltgr    %r3,%r3
+        jz      .Lmemset_fill_rest
+.Lmemset_fill_loop:
+        mvc     1(256,%r1),0(%r1)
+        la      %r1,256(%r1)
+        brctg   %r3,.Lmemset_fill_loop
+.Lmemset_fill_rest:
+        larl    %r3,.Lmemset_mvc
+        ex      %r4,0(%r3)
+        br      %r14
+.Lmemset_xc:
+        xc      0(1,%r1),0(%r1)
+.Lmemset_mvc:
+        mvc     1(1,%r1),0(%r1)
+/*
+ * memcpy implementation
+ *
+ * void *memcpy(void *dest, const void *src, size_t n)
+ */
+ENTRY(memcpy)
+        ltgr    %r4,%r4
+        bzr     %r14
+        aghi    %r4,-1
+        srlg    %r5,%r4,8
+        ltgr    %r5,%r5
+        lgr     %r1,%r2
+        jnz     .Lmemcpy_loop
+.Lmemcpy_rest:
+        larl    %r5,.Lmemcpy_mvc
+        ex      %r4,0(%r5)
+        br      %r14
+.Lmemcpy_loop:
+        mvc     0(256,%r1),0(%r3)
+        la      %r1,256(%r1)
+        la      %r3,256(%r3)
+        brctg   %r5,.Lmemcpy_loop
+        j       .Lmemcpy_rest
+.Lmemcpy_mvc:
+        mvc     0(1,%r1),0(%r3)

diff --git a/arch/s390/lib/mem64.S b/arch/s390/lib/mem64.S new file mode 100644 index 000000000000..c6d553e85ab1 --- /dev/null +++ b/arch/s390/lib/mem64.S
@@ -0,0 +1,88 @@
	1	/*
	2	* String handling functions.
	3	*
	4	* Copyright IBM Corp. 2012
	5	*/
	6
	7	#include <linux/linkage.h>
	8
	9	/*
	10	* memset implementation
	11	*
	12	* This code corresponds to the C construct below. We do distinguish
	13	* between clearing (c == 0) and setting a memory array (c != 0) simply
	14	* because nearly all memset invocations in the kernel clear memory and
	15	* the xc instruction is preferred in such cases.
	16	*
	17	* void memset(void s, int c, size_t n)
	18	* {
	19	* if (likely(c == 0))
	20	* return __builtin_memset(s, 0, n);
	21	* return __builtin_memset(s, c, n);
	22	* }
	23	*/
	24	ENTRY(memset)
	25	ltgr %r4,%r4
	26	bzr %r14
	27	ltgr %r3,%r3
	28	jnz .Lmemset_fill
	29	aghi %r4,-1
	30	srlg %r3,%r4,8
	31	ltgr %r3,%r3
	32	lgr %r1,%r2
	33	jz .Lmemset_clear_rest
	34	.Lmemset_clear_loop:
	35	xc 0(256,%r1),0(%r1)
	36	la %r1,256(%r1)
	37	brctg %r3,.Lmemset_clear_loop
	38	.Lmemset_clear_rest:
	39	larl %r3,.Lmemset_xc
	40	ex %r4,0(%r3)
	41	br %r14
	42	.Lmemset_fill:
	43	stc %r3,0(%r2)
	44	cghi %r4,1
	45	lgr %r1,%r2
	46	ber %r14
	47	aghi %r4,-2
	48	srlg %r3,%r4,8
	49	ltgr %r3,%r3
	50	jz .Lmemset_fill_rest
	51	.Lmemset_fill_loop:
	52	mvc 1(256,%r1),0(%r1)
	53	la %r1,256(%r1)
	54	brctg %r3,.Lmemset_fill_loop
	55	.Lmemset_fill_rest:
	56	larl %r3,.Lmemset_mvc
	57	ex %r4,0(%r3)
	58	br %r14
	59	.Lmemset_xc:
	60	xc 0(1,%r1),0(%r1)
	61	.Lmemset_mvc:
	62	mvc 1(1,%r1),0(%r1)
	63
	64	/*
	65	* memcpy implementation
	66	*
	67	* void memcpy(void dest, const void *src, size_t n)
	68	*/
	69	ENTRY(memcpy)
	70	ltgr %r4,%r4
	71	bzr %r14
	72	aghi %r4,-1
	73	srlg %r5,%r4,8
	74	ltgr %r5,%r5
	75	lgr %r1,%r2
	76	jnz .Lmemcpy_loop
	77	.Lmemcpy_rest:
	78	larl %r5,.Lmemcpy_mvc
	79	ex %r4,0(%r5)
	80	br %r14
	81	.Lmemcpy_loop:
	82	mvc 0(256,%r1),0(%r3)
	83	la %r1,256(%r1)
	84	la %r3,256(%r3)
	85	brctg %r5,.Lmemcpy_loop
	86	j .Lmemcpy_rest
	87	.Lmemcpy_mvc:
	88	mvc 0(1,%r1),0(%r3)