1 files changed, 133 insertions, 0 deletions

diff --git a/arch/sparc/lib/memscan.S b/arch/sparc/lib/memscan.S
new file mode 100644
index 000000000000..28e78ff090ac
--- /dev/null
+++ b/arch/sparc/lib/memscan.S
@@ -0,0 +1,133 @@
+/* $Id: memscan.S,v 1.4 1996/09/08 02:01:20 davem Exp $
+ * memscan.S: Optimized memscan for the Sparc.
+ *
+ * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
+ */
+
+/* In essence, this is just a fancy strlen. */
+
+#define LO_MAGIC 0x01010101
+#define HI_MAGIC 0x80808080
+
+        .text
+        .align  4
+        .globl  __memscan_zero, __memscan_generic
+        .globl  memscan
+__memscan_zero:
+        /* %o0 = addr, %o1 = size */
+        cmp     %o1, 0
+        bne,a   1f
+         andcc  %o0, 3, %g0
+
+        retl
+         nop
+
+1:
+        be      mzero_scan_word
+         sethi  %hi(HI_MAGIC), %g2
+
+        ldsb    [%o0], %g3
+mzero_still_not_word_aligned:
+        cmp     %g3, 0
+        bne     1f
+         add    %o0, 1, %o0
+
+        retl
+         sub    %o0, 1, %o0
+
+1:
+        subcc   %o1, 1, %o1
+        bne,a   1f
+         andcc  %o0, 3, %g0
+
+        retl
+         nop
+
+1:
+        bne,a   mzero_still_not_word_aligned
+         ldsb   [%o0], %g3
+
+        sethi   %hi(HI_MAGIC), %g2
+mzero_scan_word:
+        or      %g2, %lo(HI_MAGIC), %o3
+        sethi   %hi(LO_MAGIC), %g3
+        or      %g3, %lo(LO_MAGIC), %o2
+mzero_next_word:
+        ld      [%o0], %g2
+mzero_next_word_preloaded:
+        sub     %g2, %o2, %g2
+mzero_next_word_preloaded_next:
+        andcc   %g2, %o3, %g0
+        bne     mzero_byte_zero
+         add    %o0, 4, %o0
+
+mzero_check_out_of_fuel:
+        subcc   %o1, 4, %o1
+        bg,a    1f
+         ld     [%o0], %g2
+
+        retl
+         nop
+
+1:
+        b       mzero_next_word_preloaded_next
+         sub    %g2, %o2, %g2
+
+        /* Check every byte. */
+mzero_byte_zero:
+        ldsb    [%o0 - 4], %g2
+        cmp     %g2, 0
+        bne     mzero_byte_one
+         sub    %o0, 4, %g3
+
+        retl
+         mov    %g3, %o0
+
+mzero_byte_one:
+        ldsb    [%o0 - 3], %g2
+        cmp     %g2, 0
+        bne,a   mzero_byte_two_and_three
+         ldsb   [%o0 - 2], %g2
+
+        retl
+         sub    %o0, 3, %o0
+
+mzero_byte_two_and_three:
+        cmp     %g2, 0
+        bne,a   1f
+         ldsb   [%o0 - 1], %g2
+
+        retl
+         sub    %o0, 2, %o0
+
+1:
+        cmp     %g2, 0
+        bne,a   mzero_next_word_preloaded
+         ld     [%o0], %g2
+
+        retl
+         sub    %o0, 1, %o0
+
+mzero_found_it:
+        retl
+         sub    %o0, 2, %o0
+
+memscan:
+__memscan_generic:
+        /* %o0 = addr, %o1 = c, %o2 = size */
+        cmp     %o2, 0
+        bne,a   0f
+         ldub   [%o0], %g2
+
+        b,a     2f
+1:
+        ldub    [%o0], %g2
+0:
+        cmp     %g2, %o1
+        be      2f
+         addcc  %o2, -1, %o2
+        bne     1b
+         add    %o0, 1, %o0
+2:
+        retl
+         nop