xtensa: move headers files to arch/xtensa/include

Move all header files for xtensa to arch/xtensa/include and platform and
variant header files to the appropriate arch/xtensa/platforms/ and
arch/xtensa/variants/ directories.

Moving the files gets also rid of all uses of symlinks in the Makefile.

This has been completed already for the majority of the architectures
and xtensa is one out of six missing.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Chris Zankel <chris@zankel.net>

1 files changed, 250 insertions, 0 deletions

diff --git a/arch/xtensa/include/asm/checksum.h b/arch/xtensa/include/asm/checksum.h
new file mode 100644
index 000000000000..f84d3f00774a
--- /dev/null
+++ b/arch/xtensa/include/asm/checksum.h
@@ -0,0 +1,250 @@
+/*
+ * include/asm-xtensa/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.
+ *
+ * Copyright (C) 2001 - 2005 Tensilica Inc.
+ */
+
+#ifndef _XTENSA_CHECKSUM_H
+#define _XTENSA_CHECKSUM_H
+
+#include <linux/in6.h>
+#include <variant/core.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 __wsum csum_partial(const void *buff, int len, __wsum sum);
+
+/*
+ * 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 __wsum csum_partial_copy_generic(const void *src, void *dst, int len, __wsum sum,
+						   int *src_err_ptr, int *dst_err_ptr);
+
+/*
+ *	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)
+{
+	return csum_partial_copy_generic(src, dst, len, sum, NULL, NULL);
+}
+
+static inline
+__wsum csum_partial_copy_from_user(const void __user *src, void *dst,
+						int len, __wsum sum, int *err_ptr)
+{
+	return csum_partial_copy_generic((__force const void *)src, dst,
+					len, sum, err_ptr, NULL);
+}
+
+/*
+ *	Fold a partial checksum
+ */
+
+static __inline__ __sum16 csum_fold(__wsum sum)
+{
+	unsigned int __dummy;
+	__asm__("extui	%1, %0, 16, 16\n\t"
+		"extui	%0 ,%0, 0, 16\n\t"
+		"add	%0, %0, %1\n\t"
+		"slli	%1, %0, 16\n\t"
+		"add	%0, %0, %1\n\t"
+		"extui	%0, %0, 16, 16\n\t"
+		"neg	%0, %0\n\t"
+		"addi	%0, %0, -1\n\t"
+		"extui	%0, %0, 0, 16\n\t"
+		: "=r" (sum), "=&r" (__dummy)
+		: "0" (sum));
+	return (__force __sum16)sum;
+}
+
+/*
+ *	This is a version of ip_compute_csum() optimized for IP headers,
+ *	which always checksum on 4 octet boundaries.
+ */
+static __inline__ __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
+{
+	unsigned int sum, tmp, endaddr;
+
+	__asm__ __volatile__(
+		"sub		%0, %0, %0\n\t"
+#if XCHAL_HAVE_LOOPS
+		"loopgtz	%2, 2f\n\t"
+#else
+		"beqz		%2, 2f\n\t"
+		"slli		%4, %2, 2\n\t"
+		"add		%4, %4, %1\n\t"
+		"0:\t"
+#endif
+		"l32i		%3, %1, 0\n\t"
+		"add		%0, %0, %3\n\t"
+		"bgeu		%0, %3, 1f\n\t"
+		"addi		%0, %0, 1\n\t"
+		"1:\t"
+		"addi		%1, %1, 4\n\t"
+#if !XCHAL_HAVE_LOOPS
+		"blt		%1, %4, 0b\n\t"
+#endif
+		"2:\t"
+	/* Since the input registers which are loaded with iph and ihl
+	   are modified, we must also specify them as outputs, or gcc
+	   will assume they contain their original values. */
+		: "=r" (sum), "=r" (iph), "=r" (ihl), "=&r" (tmp), "=&r" (endaddr)
+		: "1" (iph), "2" (ihl));
+
+	return	csum_fold(sum);
+}
+
+static __inline__ __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
+						   unsigned short len,
+						   unsigned short proto,
+						   __wsum sum)
+{
+
+#ifdef __XTENSA_EL__
+	unsigned long len_proto = (len + proto) << 8;
+#elif defined(__XTENSA_EB__)
+	unsigned long len_proto = len + proto;
+#else
+# error processor byte order undefined!
+#endif
+	__asm__("add	%0, %0, %1\n\t"
+		"bgeu	%0, %1, 1f\n\t"
+		"addi	%0, %0, 1\n\t"
+		"1:\t"
+		"add	%0, %0, %2\n\t"
+		"bgeu	%0, %2, 1f\n\t"
+		"addi	%0, %0, 1\n\t"
+		"1:\t"
+		"add	%0, %0, %3\n\t"
+		"bgeu	%0, %3, 1f\n\t"
+		"addi	%0, %0, 1\n\t"
+		"1:\t"
+		: "=r" (sum), "=r" (len_proto)
+		: "r" (daddr), "r" (saddr), "1" (len_proto), "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));
+}
+
+/*
+ * 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_IPV6_CSUM
+static __inline__ __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
+					  const struct in6_addr *daddr,
+					  __u32 len, unsigned short proto,
+					  __wsum sum)
+{
+	unsigned int __dummy;
+	__asm__("l32i	%1, %2, 0\n\t"
+		"add	%0, %0, %1\n\t"
+		"bgeu	%0, %1, 1f\n\t"
+		"addi	%0, %0, 1\n\t"
+		"1:\t"
+		"l32i	%1, %2, 4\n\t"
+		"add	%0, %0, %1\n\t"
+		"bgeu	%0, %1, 1f\n\t"
+		"addi	%0, %0, 1\n\t"
+		"1:\t"
+		"l32i	%1, %2, 8\n\t"
+		"add	%0, %0, %1\n\t"
+		"bgeu	%0, %1, 1f\n\t"
+		"addi	%0, %0, 1\n\t"
+		"1:\t"
+		"l32i	%1, %2, 12\n\t"
+		"add	%0, %0, %1\n\t"
+		"bgeu	%0, %1, 1f\n\t"
+		"addi	%0, %0, 1\n\t"
+		"1:\t"
+		"l32i	%1, %3, 0\n\t"
+		"add	%0, %0, %1\n\t"
+		"bgeu	%0, %1, 1f\n\t"
+		"addi	%0, %0, 1\n\t"
+		"1:\t"
+		"l32i	%1, %3, 4\n\t"
+		"add	%0, %0, %1\n\t"
+		"bgeu	%0, %1, 1f\n\t"
+		"addi	%0, %0, 1\n\t"
+		"1:\t"
+		"l32i	%1, %3, 8\n\t"
+		"add	%0, %0, %1\n\t"
+		"bgeu	%0, %1, 1f\n\t"
+		"addi	%0, %0, 1\n\t"
+		"1:\t"
+		"l32i	%1, %3, 12\n\t"
+		"add	%0, %0, %1\n\t"
+		"bgeu	%0, %1, 1f\n\t"
+		"addi	%0, %0, 1\n\t"
+		"1:\t"
+		"add	%0, %0, %4\n\t"
+		"bgeu	%0, %4, 1f\n\t"
+		"addi	%0, %0, 1\n\t"
+		"1:\t"
+		"add	%0, %0, %5\n\t"
+		"bgeu	%0, %5, 1f\n\t"
+		"addi	%0, %0, 1\n\t"
+		"1:\t"
+		: "=r" (sum), "=&r" (__dummy)
+		: "r" (saddr), "r" (daddr),
+		  "r" (htonl(len)), "r" (htonl(proto)), "0" (sum));
+
+	return csum_fold(sum);
+}
+
+/*
+ *	Copy and checksum to user
+ */
+#define HAVE_CSUM_COPY_USER
+static __inline__ __wsum csum_and_copy_to_user(const void *src, void __user *dst,
+				    int len, __wsum 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 (__force __wsum)-1; /* invalid checksum */
+}
+#endif