Import of Linux 2.2.12 subset (ipv4 stack and related)

1 files changed, 252 insertions, 0 deletions

diff --git a/pfinet/linux-src/include/asm-sparc/checksum.h b/pfinet/linux-src/include/asm-sparc/checksum.h
new file mode 100644
index 00000000..e552cfc6
--- /dev/null
+++ b/pfinet/linux-src/include/asm-sparc/checksum.h
@@ -0,0 +1,252 @@
+/* $Id: checksum.h,v 1.29 1999/03/21 05:22:07 davem Exp $ */
+#ifndef __SPARC_CHECKSUM_H
+#define __SPARC_CHECKSUM_H
+
+/*  checksum.h:  IP/UDP/TCP checksum routines on the Sparc.
+ *
+ *  Copyright(C) 1995 Linus Torvalds
+ *  Copyright(C) 1995 Miguel de Icaza
+ *  Copyright(C) 1996 David S. Miller
+ *  Copyright(C) 1996 Eddie C. Dost
+ *  Copyright(C) 1997 Jakub Jelinek
+ *
+ * derived from:
+ *	Alpha checksum c-code
+ *      ix86 inline assembly
+ *      RFC1071 Computing the Internet Checksum
+ */
+ 
+#include <asm/uaccess.h>
+#include <asm/cprefix.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
+ */
+extern unsigned int csum_partial(unsigned char * buff, int len, unsigned int sum);
+
+/* the same as csum_partial, but copies from fs:src while it
+ * checksums
+ *
+ * here even more important to align src and dst on a 32-bit (or even
+ * better 64-bit) boundary
+ */
+
+/* FIXME: Remove these two macros ASAP */
+#define csum_partial_copy(src, dst, len, sum) \
+ 		       csum_partial_copy_nocheck(src,dst,len,sum)
+#define csum_partial_copy_fromuser(s, d, l, w)  \
+                         csum_partial_copy((char *) (s), (d), (l), (w))
+  
+extern unsigned int __csum_partial_copy_sparc_generic (const char *, char *);
+
+extern __inline__ unsigned int 
+csum_partial_copy_nocheck (const char *src, char *dst, int len, 
+			   unsigned int sum)
+{
+	register unsigned int ret asm("o0") = (unsigned int)src;
+	register char *d asm("o1") = dst;
+	register int l asm("g1") = len;
+	
+	__asm__ __volatile__ ("
+		call " C_LABEL_STR(__csum_partial_copy_sparc_generic) "
+		 mov %4, %%g7
+	" : "=r" (ret) : "0" (ret), "r" (d), "r" (l), "r" (sum) :
+	"o1", "o2", "o3", "o4", "o5", "o7", "g1", "g2", "g3", "g4", "g5", "g7");
+	return ret;
+}
+
+extern __inline__ unsigned int 
+csum_partial_copy_from_user(const char *src, char *dst, int len, 
+			    unsigned int sum, int *err)
+  {
+	if (!access_ok (VERIFY_READ, src, len)) {
+		*err = -EFAULT;
+		memset (dst, 0, len);
+		return sum;
+	} else {
+		register unsigned int ret asm("o0") = (unsigned int)src;
+		register char *d asm("o1") = dst;
+		register int l asm("g1") = len;
+		register unsigned int s asm("g7") = sum;
+
+		__asm__ __volatile__ ("
+		.section __ex_table,#alloc
+		.align 4
+		.word 1f,2
+		.previous
+1:
+		call " C_LABEL_STR(__csum_partial_copy_sparc_generic) "
+		 st %5, [%%sp + 64]
+		" : "=r" (ret) : "0" (ret), "r" (d), "r" (l), "r" (s), "r" (err) :
+		"o1", "o2", "o3", "o4", "o5", "o7", "g1", "g2", "g3", "g4", "g5", "g7");
+		return ret;
+	}
+  }
+  
+extern __inline__ unsigned int 
+csum_partial_copy_to_user(const char *src, char *dst, int len, 
+			  unsigned int sum, int *err)
+{
+	if (!access_ok (VERIFY_WRITE, dst, len)) {
+		*err = -EFAULT;
+		return sum;
+	} else {
+		register unsigned int ret asm("o0") = (unsigned int)src;
+		register char *d asm("o1") = dst;
+		register int l asm("g1") = len;
+		register unsigned int s asm("g7") = sum;
+
+		__asm__ __volatile__ ("
+		.section __ex_table,#alloc
+		.align 4
+		.word 1f,1
+		.previous
+1:
+		call " C_LABEL_STR(__csum_partial_copy_sparc_generic) "
+		 st %5, [%%sp + 64]
+		" : "=r" (ret) : "0" (ret), "r" (d), "r" (l), "r" (s), "r" (err) :
+		"o1", "o2", "o3", "o4", "o5", "o7", "g1", "g2", "g3", "g4", "g5", "g7");
+		return ret;
+	}
+}
+
+#define HAVE_CSUM_COPY_USER
+#define csum_and_copy_to_user csum_partial_copy_to_user
+
+/* ihl is always 5 or greater, almost always is 5, and iph is word aligned
+ * the majority of the time.
+ */
+extern __inline__ unsigned short ip_fast_csum(__const__ unsigned char *iph,
+					      unsigned int ihl)
+{
+	unsigned short sum;
+
+	/* Note: We must read %2 before we touch %0 for the first time,
+	 *       because GCC can legitimately use the same register for
+	 *       both operands.
+	 */
+	__asm__ __volatile__("sub\t%2, 4, %%g4\n\t"
+			     "ld\t[%1 + 0x00], %0\n\t"
+			     "ld\t[%1 + 0x04], %%g2\n\t"
+			     "ld\t[%1 + 0x08], %%g3\n\t"
+			     "addcc\t%%g2, %0, %0\n\t"
+			     "addxcc\t%%g3, %0, %0\n\t"
+			     "ld\t[%1 + 0x0c], %%g2\n\t"
+			     "ld\t[%1 + 0x10], %%g3\n\t"
+			     "addxcc\t%%g2, %0, %0\n\t"
+			     "addx\t%0, %%g0, %0\n"
+			     "1:\taddcc\t%%g3, %0, %0\n\t"
+			     "add\t%1, 4, %1\n\t"
+			     "addxcc\t%0, %%g0, %0\n\t"
+			     "subcc\t%%g4, 1, %%g4\n\t"
+			     "be,a\t2f\n\t"
+			     "sll\t%0, 16, %%g2\n\t"
+			     "b\t1b\n\t"
+			     "ld\t[%1 + 0x10], %%g3\n"
+			     "2:\taddcc\t%0, %%g2, %%g2\n\t"
+			     "srl\t%%g2, 16, %0\n\t"
+			     "addx\t%0, %%g0, %0\n\t"
+			     "xnor\t%%g0, %0, %0"
+			     : "=r" (sum), "=&r" (iph)
+			     : "r" (ihl), "1" (iph)
+			     : "g2", "g3", "g4", "cc");
+	return sum;
+}
+
+/* Fold a partial checksum without adding pseudo headers. */
+extern __inline__ unsigned int csum_fold(unsigned int sum)
+{
+	unsigned int tmp;
+
+	__asm__ __volatile__("addcc\t%0, %1, %1\n\t"
+			     "srl\t%1, 16, %1\n\t"
+			     "addx\t%1, %%g0, %1\n\t"
+			     "xnor\t%%g0, %1, %0"
+			     : "=&r" (sum), "=r" (tmp)
+			     : "0" (sum), "1" (sum<<16)
+			     : "cc");
+	return sum;
+}
+
+extern __inline__ unsigned long csum_tcpudp_nofold(unsigned long saddr,
+						   unsigned long daddr,
+						   unsigned int len,
+						   unsigned short proto,
+						   unsigned int sum)
+{
+	__asm__ __volatile__("addcc\t%1, %0, %0\n\t"
+			     "addxcc\t%2, %0, %0\n\t"
+			     "addxcc\t%3, %0, %0\n\t"
+			     "addx\t%0, %%g0, %0\n\t"
+			     : "=r" (sum), "=r" (saddr)
+			     : "r" (daddr), "r" ((proto<<16)+len), "0" (sum),
+			       "1" (saddr)
+			     : "cc");
+	return sum;
+}
+
+/*
+ * 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) 
+{
+	return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum));
+}
+
+#define _HAVE_ARCH_IPV6_CSUM
+
+static __inline__ unsigned short int csum_ipv6_magic(struct in6_addr *saddr,
+						     struct in6_addr *daddr,
+						     __u16 len,
+						     unsigned short proto,
+						     unsigned int sum) 
+{
+	__asm__ __volatile__ ("
+		addcc	%3, %4, %%g4
+		addxcc	%5, %%g4, %%g4
+		ld	[%2 + 0x0c], %%g2
+		ld	[%2 + 0x08], %%g3
+		addxcc	%%g2, %%g4, %%g4
+		ld	[%2 + 0x04], %%g2
+		addxcc	%%g3, %%g4, %%g4
+		ld	[%2 + 0x00], %%g3
+		addxcc	%%g2, %%g4, %%g4
+		ld	[%1 + 0x0c], %%g2
+		addxcc	%%g3, %%g4, %%g4
+		ld	[%1 + 0x08], %%g3
+		addxcc	%%g2, %%g4, %%g4
+		ld	[%1 + 0x04], %%g2
+		addxcc	%%g3, %%g4, %%g4
+		ld	[%1 + 0x00], %%g3
+		addxcc	%%g2, %%g4, %%g4
+		addxcc	%%g3, %%g4, %0
+		addx	0, %0, %0
+		"
+		: "=&r" (sum)
+		: "r" (saddr), "r" (daddr), 
+		  "r"(htonl((__u32) (len))), "r"(htonl(proto)), "r"(sum)
+		: "g2", "g3", "g4", "cc");
+
+	return csum_fold(sum);
+}
+
+/* this routine is used for miscellaneous IP-like checksums, mainly in icmp.c */
+extern __inline__ unsigned short ip_compute_csum(unsigned char * buff, int len)
+{
+	return csum_fold(csum_partial(buff, len, 0));
+}
+
+#endif /* !(__SPARC_CHECKSUM_H) */