This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / arch / avr32 / lib / csum_partial.S

diff --git a/arch/avr32/lib/csum_partial.S b/arch/avr32/lib/csum_partial.S
new file mode 100644 (file)
index 0000000..6a262b5
--- /dev/null
+++ b/arch/avr32/lib/csum_partial.S
@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2004-2006 Atmel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+       /*
+        * unsigned int csum_partial(const unsigned char *buff,
+        *                           int len, unsigned int sum)
+        */
+       .text
+       .global csum_partial
+       .type   csum_partial,"function"
+       .align  1
+csum_partial:
+       /* checksum complete words, aligned or not */
+3:     sub     r11, 4
+       brlt    5f
+4:     ld.w    r9, r12++
+       add     r10, r9
+       acr     r10
+       sub     r11, 4
+       brge    4b
+
+       /* return if we had a whole number of words */
+5:     sub     r11, -4
+       reteq   r10
+
+       /* checksum any remaining bytes at the end */
+       mov     r9, 0
+       mov     r8, 0
+       cp      r11, 2
+       brlt    6f
+       ld.uh   r9, r12++
+       sub     r11, 2
+       breq    7f
+       lsl     r9, 16
+6:     ld.ub   r8, r12++
+       lsl     r8, 8
+7:     or      r9, r8
+       add     r10, r9
+       acr     r10
+
+       retal   r10
+       .size   csum_partial, . - csum_partial