1 files changed, 231 insertions, 0 deletions

diff --git a/arch/sh64/lib/c-checksum.c b/arch/sh64/lib/c-checksum.c
new file mode 100644
index 000000000000..a82d8f1a7a64
--- /dev/null
+++ b/arch/sh64/lib/c-checksum.c
@@ -0,0 +1,231 @@
+/*
+ * arch/sh/lib/csum_parial.c
+ *
+ * This file contains network checksum routines that are better done
+ * in an architecture-specific manner due to speed..
+ */
+
+#undef DEBUG
+
+#include <linux/config.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <asm/byteorder.h>
+#include <asm/uaccess.h>
+
+static inline unsigned short from64to16(unsigned long long x)
+{
+        /* add up 32-bit words for 33 bits */
+        x = (x & 0xffffffff) + (x >> 32);
+        /* add up 16-bit and 17-bit words for 17+c bits */
+        x = (x & 0xffff) + (x >> 16);
+        /* add up 16-bit and 2-bit for 16+c bit */
+        x = (x & 0xffff) + (x >> 16);
+        /* add up carry.. */
+        x = (x & 0xffff) + (x >> 16);
+        return x;
+}
+
+static inline unsigned short foldto16(unsigned long x)
+{
+        /* add up 16-bit for 17 bits */
+        x = (x & 0xffff) + (x >> 16);
+        /* add up carry.. */
+        x = (x & 0xffff) + (x >> 16);
+        return x;
+}
+
+static inline unsigned short myfoldto16(unsigned long long x)
+{
+        /* Fold down to 32-bits so we don't loose in the typedef-less
+           network stack.  */
+        /* 64 to 33 */
+        x = (x & 0xffffffff) + (x >> 32);
+        /* 33 to 32 */
+        x = (x & 0xffffffff) + (x >> 32);
+
+        /* add up 16-bit for 17 bits */
+        x = (x & 0xffff) + (x >> 16);
+        /* add up carry.. */
+        x = (x & 0xffff) + (x >> 16);
+        return x;
+}
+
+#define odd(x) ((x)&1)
+#define U16(x) ntohs(x)
+
+static unsigned long do_csum(const unsigned char *buff, int len)
+{
+        int odd, count;
+        unsigned long result = 0;
+
+        pr_debug("do_csum buff %p, len %d (0x%x)\n", buff, len, len);
+#ifdef DEBUG
+        for (i = 0; i < len; i++) {
+                if ((i % 26) == 0)
+                        printk("\n");
+                printk("%02X ", buff[i]);
+        }
+#endif
+
+        if (len <= 0)
+                goto out;
+
+        odd = 1 & (unsigned long) buff;
+        if (odd) {
+                result = *buff << 8;
+                len--;
+                buff++;
+        }
+        count = len >> 1;       /* nr of 16-bit words.. */
+        if (count) {
+                if (2 & (unsigned long) buff) {
+                        result += *(unsigned short *) buff;
+                        count--;
+                        len -= 2;
+                        buff += 2;
+                }
+                count >>= 1;    /* nr of 32-bit words.. */
+                if (count) {
+                        unsigned long carry = 0;
+                        do {
+                                unsigned long w = *(unsigned long *) buff;
+                                buff += 4;
+                                count--;
+                                result += carry;
+                                result += w;
+                                carry = (w > result);
+                        } while (count);
+                        result += carry;
+                        result = (result & 0xffff) + (result >> 16);
+                }
+                if (len & 2) {
+                        result += *(unsigned short *) buff;
+                        buff += 2;
+                }
+        }
+        if (len & 1)
+                result += *buff;
+        result = foldto16(result);
+        if (odd)
+                result = ((result >> 8) & 0xff) | ((result & 0xff) << 8);
+
+        pr_debug("\nCHECKSUM is 0x%x\n", result);
+
+      out:
+        return result;
+}
+
+/* computes the checksum of a memory block at buff, length len,
+   and adds in "sum" (32-bit)  */
+unsigned int csum_partial(const unsigned char *buff, int len, unsigned int sum)
+{
+        unsigned long long result = do_csum(buff, len);
+
+        /* add in old sum, and carry.. */
+        result += sum;
+        /* 32+c bits -> 32 bits */
+        result = (result & 0xffffffff) + (result >> 32);
+
+        pr_debug("csum_partial, buff %p len %d sum 0x%x result=0x%016Lx\n",
+                buff, len, sum, result);
+
+        return result;
+}
+
+/* Copy while checksumming, otherwise like csum_partial.  */
+unsigned int
+csum_partial_copy(const unsigned char *src, unsigned char *dst, int len, unsigned int sum)
+{
+        sum = csum_partial(src, len, sum);
+        memcpy(dst, src, len);
+
+        return sum;
+}
+
+/* Copy from userspace and compute checksum.  If we catch an exception
+   then zero the rest of the buffer.  */
+unsigned int
+csum_partial_copy_from_user(const unsigned char *src, unsigned char *dst, int len,
+                            unsigned int sum, int *err_ptr)
+{
+        int missing;
+
+        pr_debug
+            ("csum_partial_copy_from_user src %p, dest %p, len %d, sum %08x, err_ptr %p\n",
+             src, dst, len, sum, err_ptr);
+        missing = copy_from_user(dst, src, len);
+        pr_debug("  access_ok %d\n", __access_ok((unsigned long) src, len));
+        pr_debug("  missing %d\n", missing);
+        if (missing) {
+                memset(dst + len - missing, 0, missing);
+                *err_ptr = -EFAULT;
+        }
+
+        return csum_partial(dst, len, sum);
+}
+
+/* Copy to userspace and compute checksum.  */
+unsigned int
+csum_partial_copy_to_user(const unsigned char *src, unsigned char *dst, int len,
+                          unsigned int sum, int *err_ptr)
+{
+        sum = csum_partial(src, len, sum);
+
+        if (copy_to_user(dst, src, len))
+                *err_ptr = -EFAULT;
+
+        return sum;
+}
+
+/*
+ *      This is a version of ip_compute_csum() optimized for IP headers,
+ *      which always checksum on 4 octet boundaries.
+ */
+unsigned short ip_fast_csum(unsigned char *iph, unsigned int ihl)
+{
+        pr_debug("ip_fast_csum %p,%d\n", iph, ihl);
+
+        return ~do_csum(iph, ihl * 4);
+}
+
+unsigned int csum_tcpudp_nofold(unsigned long saddr,
+                                unsigned long daddr,
+                                unsigned short len,
+                                unsigned short proto, unsigned int sum)
+{
+        unsigned long long result;
+
+        pr_debug("ntohs(0x%x)=0x%x\n", 0xdead, ntohs(0xdead));
+        pr_debug("htons(0x%x)=0x%x\n", 0xdead, htons(0xdead));
+
+        result = ((unsigned long long) saddr +
+                  (unsigned long long) daddr +
+                  (unsigned long long) sum +
+                  ((unsigned long long) ntohs(len) << 16) +
+                  ((unsigned long long) proto << 8));
+
+        /* Fold down to 32-bits so we don't loose in the typedef-less
+           network stack.  */
+        /* 64 to 33 */
+        result = (result & 0xffffffff) + (result >> 32);
+        /* 33 to 32 */
+        result = (result & 0xffffffff) + (result >> 32);
+
+        pr_debug("%s saddr %x daddr %x len %x proto %x sum %x result %08Lx\n",
+                __FUNCTION__, saddr, daddr, len, proto, sum, result);
+
+        return result;
+}
+
+// Post SIM:
+unsigned int
+csum_partial_copy_nocheck(const unsigned char *src, unsigned char *dst, int len, unsigned int sum)
+{
+        //  unsigned dummy;
+        pr_debug("csum_partial_copy_nocheck src %p dst %p len %d\n", src, dst,
+                len);
+
+        return csum_partial_copy(src, dst, len, sum);
+}