patch-2.4.22 linux-2.4.22/include/asm-sh64/checksum.h

• Lines: 322
• Date: 2003-08-25 04:44:44.000000000 -0700
• Orig file: linux-2.4.21/include/asm-sh64/checksum.h
• Orig date: 1969-12-31 16:00:00.000000000 -0800

diff -urN linux-2.4.21/include/asm-sh64/checksum.h linux-2.4.22/include/asm-sh64/checksum.h
@@ -0,0 +1,321 @@
+#ifndef __ASM_SH64_CHECKSUM_H
+#define __ASM_SH64_CHECKSUM_H
+
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * include/asm-sh64/checksum.h
+ *
+ * Copyright (C) 2000, 2001  Paolo Alberelli
+ *
+ */
+
+#include <asm/registers.h>
+
+/*
+ * computes the checksum of a memory block at buff, length len,
+ * and adds in "sum" (32-bit)
+ *
+ * returns a 32-bit number suitable for feeding into itself
+ * or csum_tcpudp_magic
+ *
+ * this function must be called with even lengths, except
+ * for the last fragment, which may be odd
+ *
+ * it's best to have buff aligned on a 32-bit boundary
+ */
+asmlinkage unsigned int csum_partial(const unsigned char * buff, int len, unsigned int sum);
+//x
+
+/*
+ *	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 
+ *	verify_area().
+ */
+
+
+#ifdef DJM_USE_ASM_CHECKSUM
+
+/*
+ * the same as csum_partial, but copies from src while it
+ * checksums, and handles user-space pointer exceptions correctly, when needed.
+ *
+ * here even more important to align src and dst on a 32-bit (or even
+ * better 64-bit) boundary
+ */
+
+asmlinkage unsigned int csum_partial_copy_generic( const char *src, char *dst, int len, int sum,
+						   int *src_err_ptr, int *dst_err_ptr);
+extern __inline__
+unsigned int csum_partial_copy_nocheck ( const char *src, char *dst,
+					int len, int sum)
+{
+	return csum_partial_copy_generic ( src, dst, len, sum, NULL, NULL);
+}
+#else
+// Pre SIM:
+//#define csum_partial_copy_nocheck csum_partial_copy
+// Post SIM:
+unsigned int
+csum_partial_copy_nocheck(const char *src, char *dst, int len, unsigned int sum);
+#endif
+
+#ifdef DJM_USE_ASM_CHECKSUM
+
+extern __inline__
+unsigned int csum_partial_copy_from_user ( const char *src, char *dst,
+						int len, unsigned int sum, int *err_ptr)
+{
+	return csum_partial_copy_generic ( src, dst, len, sum, err_ptr, NULL);
+}
+#else 
+unsigned int csum_partial_copy_from_user ( const char *src, char *dst,
+					   int len, int sum, int *err_ptr);
+//x
+#endif
+
+
+/*
+ * These are the old (and unsafe) way of doing checksums, a warning message will be
+ * printed if they are used and an exeption occurs.
+ *
+ * these functions should go away after some time.
+ */
+
+#define csum_partial_copy_fromuser csum_partial_copy
+//x
+unsigned int csum_partial_copy( const char *src, char *dst, int len, unsigned int sum);
+//x
+
+/*
+ *	Fold a partial checksum
+ */
+
+#ifdef DJM_USE_ASM_CHECKSUM
+static __inline__ unsigned int csum_fold(unsigned int sum)
+{
+	unsigned long long __dummy;
+	__asm__("mshflo.w	r63, %0, %0\n\t"
+		"mshflo.w	%0, r63, %1\n\t"
+		"mshfhi.w	%0, r63, %0\n\t"
+		"add		%0, %1, %0\n\t"
+		"shlli		%0, 16, %1\n\t"
+		"add		%0, %1, %0\n\t"
+		"sub		r63, %0, %0\n\t"
+		"shlri		%0, 48, %0"
+		: "=r" (sum), "=&r" (__dummy)
+		: "0" (sum));
+	return sum;
+}
+#else
+
+static inline unsigned short csum_fold(unsigned int sum)
+//x
+{
+        sum = (sum & 0xffff) + (sum >> 16);
+        sum = (sum & 0xffff) + (sum >> 16);
+        return ~(sum);
+}
+#endif
+
+
+
+
+#ifdef DJM_USE_ASM_CHECKSUM
+/*
+ *	This is a version of ip_compute_csum() optimized for IP headers,
+ *	which always checksum on 4 octet boundaries.
+ *
+ *      i386 version by Jorge Cwik <jorge@laser.satlink.net>, adapted
+ *      for linux by * Arnt Gulbrandsen.
+ */
+static __inline__ unsigned short ip_fast_csum(unsigned char * iph, unsigned int ihl)
+{
+	unsigned long long sum, __dummy0, __dummy1;
+
+	__asm__ __volatile__(
+		"or	r63, r63, %0\n\t"	/* Clear upper part */
+		"or	r63, r63, %3\n\t"	/* Clear upper part */
+		"gettr	" __t0 ", %4\n\t"		/* t0 saving */
+
+		/* Less waste using .UW than removing sign extension */
+		"shlli	%2, 1, %2\n\t"		/* Longs -> Shorts */
+		"addi	%2, -2, %2\n\t"		/* Last Short to start from */
+		"ldx.uw	%1, %2, %0\n\t"		/* Get last */
+		"addi	%2, -2, %2\n\t"		/* Do it reverse */
+		"_pta	4, " __t0 "\n\t"
+
+		"ldx.uw	%1, %2, %3\n\t"
+		"add	%0, %3, %0\n\t"		/* Do the sum */
+		"shlri	%0, 16, %3\n\t"
+		"add	%0, %3, %0\n\t"		/* Fold it now */
+		"shlli	%3, 16, %3\n\t"
+		"sub	%0, %3, %0\n\t"		/* Remove carry, if any */
+		"addi	%2, -2, %2\n\t"		/* Do it reverse */
+		"bnei	%2, -2, " __t0 "\n\t"
+
+		"shlli	%0, 48, %0\n\t"		/* Not sure this is required */
+		"sub	r63, %0, %0\n\t"	/* Not */
+		"shlri	%0, 48, %0\n\t"		/* Not sure this is required */
+		"ptabs	%4, " __t0 "\n\t"
+	
+	: "=r" (sum), "=r" (iph), "=r" (ihl), "=r" (__dummy0), "=r" (__dummy1)
+	: "1" (iph), "2" (ihl));
+
+	return (unsigned short) sum;
+}
+#else
+unsigned short ip_fast_csum(unsigned char * iph, unsigned int ihl);
+//x
+#endif
+
+
+#ifdef DJM_USE_ASM_CHECKSUM
+
+static __inline__ unsigned long csum_tcpudp_nofold(unsigned long saddr,
+						   unsigned long daddr,
+						   unsigned short len,
+						   unsigned short proto,
+						   unsigned int sum) 
+{
+#ifdef __LITTLE_ENDIAN__
+	unsigned long len_proto = (ntohs(len)<<16)+proto*256;
+#else
+	unsigned long len_proto = (proto<<16)+len;
+#endif
+	__asm__("add	%0, %1, %0\n\t"
+		"add	%0, %2, %0\n\t"
+		"add	%0, %3, %0\n\t"
+		"shlri	%0, 32, %1\n\t"
+		"add	%0, %1, %0\n\t"		/* Fold it to a long */
+		"shlli	%1, 32, %1\n\t"
+		"sub	%0, %1, %0\n\t"		/* Remove carry, if any */
+		: "=r" (sum), "=r" (len_proto)
+		: "r" (daddr), "r" (saddr), "1" (len_proto), "0" (sum));
+
+	return sum;
+}
+#else
+unsigned long csum_tcpudp_nofold(unsigned long saddr,
+						   unsigned long daddr,
+						   unsigned short len,
+						   unsigned short proto,
+				 unsigned int sum) ;
+//x
+#endif
+
+/*
+ * computes the checksum of the TCP/UDP pseudo-header
+ * returns a 16-bit checksum, already complemented
+ */
+static __inline__ unsigned short int csum_tcpudp_magic(unsigned long saddr,
+						       unsigned long daddr,
+						       unsigned short len,
+						       unsigned short proto,
+						       unsigned int sum) 
+//x
+{
+  unsigned short int x;
+  //printk("csum_tcpudp_magic saddr %08x daddr %08x len %04x proto %04x sum %08x\n",
+  //	 saddr,daddr,len,proto,sum);
+  x = csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum));
+  //printk("csum_tcpudp_magic returning %04x\n", x);
+  return x;
+}
+
+/*
+ * this routine is used for miscellaneous IP-like checksums, mainly
+ * in icmp.c
+ */
+
+static __inline__ unsigned short ip_compute_csum(unsigned char * buff, int len)
+//x
+{
+    return csum_fold (csum_partial(buff, len, 0));
+}
+
+
+#ifdef DJM_USE_ASM_CHECKSUM
+#define _HAVE_ARCH_IPV6_CSUM
+static __inline__ unsigned short int csum_ipv6_magic(struct in6_addr *saddr,
+						     struct in6_addr *daddr,
+						     __u32 len,
+						     unsigned short proto,
+						     unsigned int sum) 
+{
+	unsigned int __dummy;
+
+	__asm__("ld.l	%2, 0, %1\n\t"
+		"add	%0, %1, %0\n\t"
+		"ld.l	%2, 4, %1\n\t"
+		"add	%0, %1, %0\n\t"
+		"ld.l	%2, 8, %1\n\t"
+		"add	%0, %1, %0\n\t"
+		"ld.l	%2, 12, %1\n\t"
+		"add	%0, %1, %0\n\t"
+		"ld.l	%3, 0, %1\n\t"
+		"add	%0, %1, %0\n\t"
+		"ld.l	%3, 4, %1\n\t"
+		"add	%0, %1, %0\n\t"
+		"ld.l	%3, 8, %1\n\t"
+		"add	%0, %1, %0\n\t"
+		"ld.l	%3, 12, %1\n\t"
+		"add	%0, %1, %0\n\t"
+		"add	%0, %4, %0\n\t"
+		"add	%0, %5, %0\n\t"
+		"shlri	%0, 32, %1\n\t"
+		"add	%0, %1, %0\n\t"		/* Fold it to a long */
+		"shlli	%1, 32, %1\n\t"
+		"sub	%0, %1, %0\n\t"		/* Remove carry, if any */
+		: "=r" (sum), "=&r" (__dummy)
+		: "r" (saddr), "r" (daddr), 
+		  "r" (htonl(len)), "r" (htonl(proto)), "0" (sum));
+
+	return csum_fold(sum);
+}
+#endif
+
+
+#ifdef DJM_USE_ASM_CHECKSUM
+/* 
+ *	Copy and checksum to user
+ */
+
+
+#define HAVE_CSUM_COPY_USER
+static __inline__ unsigned int csum_and_copy_to_user (const char *src, char *dst,
+				    int len, int sum, int *err_ptr)
+{
+	if (access_ok(VERIFY_WRITE, dst, len))
+		return csum_partial_copy_generic(src, dst, len, sum, NULL, err_ptr);
+
+	if (len)
+		*err_ptr = -EFAULT;
+
+	return -1; /* invalid checksum */
+}
+
+#endif
+
+
+#endif /* __ASM_SH64_CHECKSUM_H */
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+