1 files changed, 144 insertions, 0 deletions

diff --git a/arch/x86/um/asm/checksum_64.h b/arch/x86/um/asm/checksum_64.h
new file mode 100644
index 000000000000..a5be9031ea85
--- /dev/null
+++ b/arch/x86/um/asm/checksum_64.h
@@ -0,0 +1,144 @@
+/*
+ * Licensed under the GPL
+ */
+
+#ifndef __UM_SYSDEP_CHECKSUM_H
+#define __UM_SYSDEP_CHECKSUM_H
+
+#include "linux/string.h"
+#include "linux/in6.h"
+#include "asm/uaccess.h"
+
+extern __wsum csum_partial(const void *buff, int len, __wsum sum);
+
+/*
+ *      Note: when you get a NULL pointer exception here this means someone
+ *      passed in an incorrect kernel address to one of these functions.
+ *
+ *      If you use these functions directly please don't forget the
+ *      access_ok().
+ */
+
+static __inline__
+__wsum csum_partial_copy_nocheck(const void *src, void *dst,
+                                       int len, __wsum sum)
+{
+        memcpy(dst, src, len);
+        return(csum_partial(dst, len, sum));
+}
+
+static __inline__
+__wsum csum_partial_copy_from_user(const void __user *src,
+                                         void *dst, int len, __wsum sum,
+                                         int *err_ptr)
+{
+        if (copy_from_user(dst, src, len)) {
+                *err_ptr = -EFAULT;
+                return (__force __wsum)-1;
+        }
+        return csum_partial(dst, len, sum);
+}
+
+/**
+ * csum_fold - Fold and invert a 32bit checksum.
+ * sum: 32bit unfolded sum
+ *
+ * Fold a 32bit running checksum to 16bit and invert it. This is usually
+ * the last step before putting a checksum into a packet.
+ * Make sure not to mix with 64bit checksums.
+ */
+static inline __sum16 csum_fold(__wsum sum)
+{
+        __asm__(
+                "  addl %1,%0\n"
+                "  adcl $0xffff,%0"
+                : "=r" (sum)
+                : "r" ((__force u32)sum << 16),
+                  "0" ((__force u32)sum & 0xffff0000)
+        );
+        return (__force __sum16)(~(__force u32)sum >> 16);
+}
+
+/**
+ * csum_tcpup_nofold - Compute an IPv4 pseudo header checksum.
+ * @saddr: source address
+ * @daddr: destination address
+ * @len: length of packet
+ * @proto: ip protocol of packet
+ * @sum: initial sum to be added in (32bit unfolded)
+ *
+ * Returns the pseudo header checksum the input data. Result is
+ * 32bit unfolded.
+ */
+static inline __wsum
+csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len,
+                   unsigned short proto, __wsum sum)
+{
+        asm("  addl %1, %0\n"
+            "  adcl %2, %0\n"
+            "  adcl %3, %0\n"
+            "  adcl $0, %0\n"
+                : "=r" (sum)
+            : "g" (daddr), "g" (saddr), "g" ((len + proto) << 8), "0" (sum));
+        return sum;
+}
+
+/*
+ * computes the checksum of the TCP/UDP pseudo-header
+ * returns a 16-bit checksum, already complemented
+ */
+static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
+                                           unsigned short len,
+                                           unsigned short proto,
+                                           __wsum sum)
+{
+        return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum));
+}
+
+/**
+ * ip_fast_csum - Compute the IPv4 header checksum efficiently.
+ * iph: ipv4 header
+ * ihl: length of header / 4
+ */
+static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
+{
+        unsigned int sum;
+
+        asm(    "  movl (%1), %0\n"
+                "  subl $4, %2\n"
+                "  jbe 2f\n"
+                "  addl 4(%1), %0\n"
+                "  adcl 8(%1), %0\n"
+                "  adcl 12(%1), %0\n"
+                "1: adcl 16(%1), %0\n"
+                "  lea 4(%1), %1\n"
+                "  decl %2\n"
+                "  jne  1b\n"
+                "  adcl $0, %0\n"
+                "  movl %0, %2\n"
+                "  shrl $16, %0\n"
+                "  addw %w2, %w0\n"
+                "  adcl $0, %0\n"
+                "  notl %0\n"
+                "2:"
+        /* Since the input registers which are loaded with iph and ipl
+           are modified, we must also specify them as outputs, or gcc
+           will assume they contain their original values. */
+        : "=r" (sum), "=r" (iph), "=r" (ihl)
+        : "1" (iph), "2" (ihl)
+        : "memory");
+        return (__force __sum16)sum;
+}
+
+static inline unsigned add32_with_carry(unsigned a, unsigned b)
+{
+        asm("addl %2,%0\n\t"
+            "adcl $0,%0"
+            : "=r" (a)
+            : "0" (a), "r" (b));
+        return a;
+}
+
+extern __sum16 ip_compute_csum(const void *buff, int len);
+
+#endif