Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 85 insertions, 0 deletions

diff --git a/arch/cris/arch-v10/lib/old_checksum.c b/arch/cris/arch-v10/lib/old_checksum.c
new file mode 100644
index 000000000000..22a6f0aa9cef
--- /dev/null
+++ b/arch/cris/arch-v10/lib/old_checksum.c
@@ -0,0 +1,85 @@
+/* $Id: old_checksum.c,v 1.3 2003/10/27 08:04:32 starvik Exp $
+ *
+ * INET         An implementation of the TCP/IP protocol suite for the LINUX
+ *              operating system.  INET is implemented using the  BSD Socket
+ *              interface as the means of communication with the user level.
+ *
+ *              IP/TCP/UDP checksumming routines
+ *
+ * Authors:     Jorge Cwik, <jorge@laser.satlink.net>
+ *              Arnt Gulbrandsen, <agulbra@nvg.unit.no>
+ *              Tom May, <ftom@netcom.com>
+ *              Lots of code moved from tcp.c and ip.c; see those files
+ *              for more names.
+ *
+ *              This program is free software; you can redistribute it and/or
+ *              modify it under the terms of the GNU General Public License
+ *              as published by the Free Software Foundation; either version
+ *              2 of the License, or (at your option) any later version.
+ */
+
+#include <net/checksum.h>
+#include <net/module.h>
+
+#undef PROFILE_CHECKSUM
+
+#ifdef PROFILE_CHECKSUM
+/* these are just for profiling the checksum code with an oscillioscope.. uh */
+#if 0
+#define BITOFF *((unsigned char *)0xb0000030) = 0xff
+#define BITON *((unsigned char *)0xb0000030) = 0x0
+#endif
+#include <asm/io.h>
+#define CBITON LED_ACTIVE_SET(1)
+#define CBITOFF LED_ACTIVE_SET(0)
+#define BITOFF
+#define BITON
+#else
+#define BITOFF
+#define BITON
+#define CBITOFF
+#define CBITON
+#endif
+
+/*
+ * computes a partial checksum, e.g. for TCP/UDP fragments
+ */
+
+#include <asm/delay.h>
+
+unsigned int csum_partial(const unsigned char * buff, int len, unsigned int sum)
+{
+  /*
+   * Experiments with ethernet and slip connections show that buff
+   * is aligned on either a 2-byte or 4-byte boundary.
+   */
+  const unsigned char *endMarker = buff + len;
+  const unsigned char *marker = endMarker - (len % 16);
+#if 0
+  if((int)buff & 0x3)
+    printk("unaligned buff %p\n", buff);
+  __delay(900); /* extra delay of 90 us to test performance hit */
+#endif
+  BITON;
+  while (buff < marker) {
+    sum += *((unsigned short *)buff)++;
+    sum += *((unsigned short *)buff)++;
+    sum += *((unsigned short *)buff)++;
+    sum += *((unsigned short *)buff)++;
+    sum += *((unsigned short *)buff)++;
+    sum += *((unsigned short *)buff)++;
+    sum += *((unsigned short *)buff)++;
+    sum += *((unsigned short *)buff)++;
+  }
+  marker = endMarker - (len % 2);
+  while(buff < marker) {
+    sum += *((unsigned short *)buff)++;
+  }
+  if(endMarker - buff > 0) {
+    sum += *buff;                 /* add extra byte seperately */
+  }
+  BITOFF;
+  return(sum);
+}
+
+EXPORT_SYMBOL(csum_partial);