Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 210 insertions, 0 deletions

diff --git a/arch/sparc/include/asm/checksum_32.h b/arch/sparc/include/asm/checksum_32.h
new file mode 100644
index 000000000..ce11e0ad8
--- /dev/null
+++ b/arch/sparc/include/asm/checksum_32.h
@@ -0,0 +1,210 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#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 <linux/in6.h>
+#include <linux/uaccess.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
+ */
+__wsum csum_partial(const void *buff, int len, __wsum 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
+ */
+
+unsigned int __csum_partial_copy_sparc_generic (const unsigned char *, unsigned char *);
+
+static inline __wsum
+csum_partial_copy_nocheck(const void *src, void *dst, int len)
+{
+	register unsigned int ret asm("o0") = (unsigned int)src;
+	register char *d asm("o1") = dst;
+	register int l asm("g1") = len;
+
+	__asm__ __volatile__ (
+		"call __csum_partial_copy_sparc_generic\n\t"
+		" mov -1, %%g7\n"
+	: "=&r" (ret), "=&r" (d), "=&r" (l)
+	: "0" (ret), "1" (d), "2" (l)
+	: "o2", "o3", "o4", "o5", "o7",
+	  "g2", "g3", "g4", "g5", "g7",
+	  "memory", "cc");
+	return (__force __wsum)ret;
+}
+
+static inline __wsum
+csum_and_copy_from_user(const void __user *src, void *dst, int len)
+{
+	if (unlikely(!access_ok(src, len)))
+		return 0;
+	return csum_partial_copy_nocheck((__force void *)src, dst, len);
+}
+
+static inline __wsum
+csum_and_copy_to_user(const void *src, void __user *dst, int len)
+{
+	if (!access_ok(dst, len))
+		return 0;
+	return csum_partial_copy_nocheck(src, (__force void *)dst, len);
+}
+
+/* ihl is always 5 or greater, almost always is 5, and iph is word aligned
+ * the majority of the time.
+ */
+static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
+{
+	__sum16 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", "memory");
+	return sum;
+}
+
+/* Fold a partial checksum without adding pseudo headers. */
+static inline __sum16 csum_fold(__wsum 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" ((__force u32)sum<<16)
+			     : "cc");
+	return (__force __sum16)sum;
+}
+
+static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
+					__u32 len, __u8 proto,
+					__wsum 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 + 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 __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
+					__u32 len, __u8 proto,
+					__wsum sum)
+{
+	return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum));
+}
+
+#define _HAVE_ARCH_IPV6_CSUM
+
+static inline __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
+				      const struct in6_addr *daddr,
+				      __u32 len, __u8 proto, __wsum sum)
+{
+	__asm__ __volatile__ (
+		"addcc	%3, %4, %%g4\n\t"
+		"addxcc	%5, %%g4, %%g4\n\t"
+		"ld	[%2 + 0x0c], %%g2\n\t"
+		"ld	[%2 + 0x08], %%g3\n\t"
+		"addxcc	%%g2, %%g4, %%g4\n\t"
+		"ld	[%2 + 0x04], %%g2\n\t"
+		"addxcc	%%g3, %%g4, %%g4\n\t"
+		"ld	[%2 + 0x00], %%g3\n\t"
+		"addxcc	%%g2, %%g4, %%g4\n\t"
+		"ld	[%1 + 0x0c], %%g2\n\t"
+		"addxcc	%%g3, %%g4, %%g4\n\t"
+		"ld	[%1 + 0x08], %%g3\n\t"
+		"addxcc	%%g2, %%g4, %%g4\n\t"
+		"ld	[%1 + 0x04], %%g2\n\t"
+		"addxcc	%%g3, %%g4, %%g4\n\t"
+		"ld	[%1 + 0x00], %%g3\n\t"
+		"addxcc	%%g2, %%g4, %%g4\n\t"
+		"addxcc	%%g3, %%g4, %0\n\t"
+		"addx	0, %0, %0\n"
+		: "=&r" (sum)
+		: "r" (saddr), "r" (daddr),
+		  "r"(htonl(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 */
+static inline __sum16 ip_compute_csum(const void *buff, int len)
+{
+	return csum_fold(csum_partial(buff, len, 0));
+}
+
+#define HAVE_ARCH_CSUM_ADD
+static inline __wsum csum_add(__wsum csum, __wsum addend)
+{
+	__asm__ __volatile__(
+		"addcc   %0, %1, %0\n"
+		"addx    %0, %%g0, %0"
+		: "=r" (csum)
+		: "r" (addend), "0" (csum));
+
+	return csum;
+}
+
+#endif /* !(__SPARC_CHECKSUM_H) */