metag: Optimised library functions

Add optimised library functions for metag.

Signed-off-by: James Hogan <james.hogan@imgtec.com>

arch/metag/include/asm/checksum.h

@@ -0,0 +1,92 @@
+#ifndef _METAG_CHECKSUM_H
+#define _METAG_CHECKSUM_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 __wsum csum_partial(const void *buff, int len, __wsum sum);
+
+/*
+ * the same as csum_partial, but copies from src while it
+ * checksums
+ *
+ * here even more important to align src and dst on a 32-bit (or even
+ * better 64-bit) boundary
+ */
+extern __wsum csum_partial_copy(const void *src, void *dst, int len,
+				__wsum sum);
+
+/*
+ * the same as csum_partial_copy, but copies from user space.
+ *
+ * here even more important to align src and dst on a 32-bit (or even
+ * better 64-bit) boundary
+ */
+extern __wsum csum_partial_copy_from_user(const void __user *src, void *dst,
+					int len, __wsum sum, int *csum_err);
+
+#define csum_partial_copy_nocheck(src, dst, len, sum)	\
+	csum_partial_copy((src), (dst), (len), (sum))
+
+/*
+ * Fold a partial checksum
+ */
+static inline __sum16 csum_fold(__wsum csum)
+{
+	u32 sum = (__force u32)csum;
+	sum = (sum & 0xffff) + (sum >> 16);
+	sum = (sum & 0xffff) + (sum >> 16);
+	return (__force __sum16)~sum;
+}
+
+/*
+ * This is a version of ip_compute_csum() optimized for IP headers,
+ * which always checksum on 4 octet boundaries.
+ */
+extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl);
+
+/*
+ * computes the checksum of the TCP/UDP pseudo-header
+ * returns a 16-bit checksum, already complemented
+ */
+static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
+					unsigned short len,
+					unsigned short proto,
+					__wsum sum)
+{
+	unsigned long len_proto = (proto + len) << 8;
+	asm ("ADD    %0, %0, %1\n"
+	     "ADDS   %0, %0, %2\n"
+	     "ADDCS  %0, %0, #1\n"
+	     "ADDS   %0, %0, %3\n"
+	     "ADDCS  %0, %0, #1\n"
+	     : "=d" (sum)
+	     : "d" (daddr), "d" (saddr), "d" (len_proto),
+	       "0" (sum)
+	     : "cc");
+	return sum;
+}
+
+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
+ */
+extern __sum16 ip_compute_csum(const void *buff, int len);
+
+#endif /* _METAG_CHECKSUM_H */

arch/metag/include/asm/div64.h

@@ -0,0 +1,12 @@
+#ifndef __ASM_DIV64_H__
+#define __ASM_DIV64_H__
+
+#include <asm-generic/div64.h>
+
+extern u64 div_u64(u64 dividend, u64 divisor);
+extern s64 div_s64(s64 dividend, s64 divisor);
+
+#define div_u64 div_u64
+#define div_s64 div_s64
+
+#endif

arch/metag/include/asm/string.h

@@ -0,0 +1,13 @@
+#ifndef _METAG_STRING_H_
+#define _METAG_STRING_H_
+
+#define __HAVE_ARCH_MEMSET
+extern void *memset(void *__s, int __c, size_t __count);
+
+#define __HAVE_ARCH_MEMCPY
+void *memcpy(void *__to, __const__ void *__from, size_t __n);
+
+#define __HAVE_ARCH_MEMMOVE
+extern void *memmove(void *__dest, __const__ void *__src, size_t __n);
+
+#endif /* _METAG_STRING_H_ */

arch/metag/lib/ashldi3.S

@@ -0,0 +1,33 @@
+! Copyright (C) 2012 by Imagination Technologies Ltd.
+!
+! 64-bit arithmetic shift left routine.
+!
+
+	.text
+	.global ___ashldi3
+	.type   ___ashldi3,function
+
+___ashldi3:
+	MOV     D0Re0,D0Ar2
+	MOV     D1Re0,D1Ar1
+	CMP     D1Ar3,#0                ! COUNT == 0
+	MOVEQ   PC,D1RtP                ! Yes, return
+
+	SUBS    D0Ar4,D1Ar3,#32         ! N = COUNT - 32
+	BGE     $L10
+
+!! Shift < 32
+	NEG     D0Ar4,D0Ar4             ! N = - N
+	LSL     D1Re0,D1Re0,D1Ar3       ! HI = HI << COUNT
+	LSR     D0Ar6,D0Re0,D0Ar4       ! TMP= LO >> -(COUNT - 32)
+	OR      D1Re0,D1Re0,D0Ar6       ! HI = HI | TMP
+	SWAP    D0Ar4,D1Ar3
+	LSL     D0Re0,D0Re0,D0Ar4       ! LO = LO << COUNT
+	MOV     PC,D1RtP
+
+$L10:
+!! Shift >= 32
+	LSL     D1Re0,D0Re0,D0Ar4       ! HI = LO << N
+	MOV     D0Re0,#0                ! LO = 0
+	MOV     PC,D1RtP
+	.size ___ashldi3,.-___ashldi3

arch/metag/lib/ashrdi3.S

@@ -0,0 +1,33 @@
+! Copyright (C) 2012 by Imagination Technologies Ltd.
+!
+! 64-bit arithmetic shift right routine.
+!
+
+	.text
+	.global ___ashrdi3
+	.type   ___ashrdi3,function
+
+___ashrdi3:
+	MOV     D0Re0,D0Ar2
+	MOV     D1Re0,D1Ar1
+	CMP     D1Ar3,#0                ! COUNT == 0
+	MOVEQ   PC,D1RtP                ! Yes, return
+
+	MOV     D0Ar4,D1Ar3
+	SUBS    D1Ar3,D1Ar3,#32         ! N = COUNT - 32
+	BGE     $L20
+
+!! Shift < 32
+	NEG     D1Ar3,D1Ar3             ! N = - N
+	LSR     D0Re0,D0Re0,D0Ar4       ! LO = LO >> COUNT
+	LSL     D0Ar6,D1Re0,D1Ar3       ! TMP= HI << -(COUNT - 32)
+	OR      D0Re0,D0Re0,D0Ar6       ! LO = LO | TMP
+	SWAP    D1Ar3,D0Ar4
+	ASR     D1Re0,D1Re0,D1Ar3       ! HI = HI >> COUNT
+	MOV     PC,D1RtP
+$L20:
+!! Shift >= 32
+	ASR     D0Re0,D1Re0,D1Ar3       ! LO = HI >> N
+	ASR     D1Re0,D1Re0,#31         ! HI = HI >> 31
+	MOV     PC,D1RtP
+	.size ___ashrdi3,.-___ashrdi3

arch/metag/lib/checksum.c

@@ -0,0 +1,168 @@
+/*
+ *
+ * INET		An implementation of the TCP/IP protocol suite for the LINUX
+ *		operating system.  INET is implemented using the  BSD Socket
+ *		interface as the means of communication with the user level.
+ *
+ *		IP/TCP/UDP checksumming routines
+ *
+ * Authors:	Jorge Cwik, <jorge@laser.satlink.net>
+ *		Arnt Gulbrandsen, <agulbra@nvg.unit.no>
+ *		Tom May, <ftom@netcom.com>
+ *		Andreas Schwab, <schwab@issan.informatik.uni-dortmund.de>
+ *		Lots of code moved from tcp.c and ip.c; see those files
+ *		for more names.
+ *
+ * 03/02/96	Jes Sorensen, Andreas Schwab, Roman Hodek:
+ *		Fixed some nasty bugs, causing some horrible crashes.
+ *		A: At some points, the sum (%0) was used as
+ *		length-counter instead of the length counter
+ *		(%1). Thanks to Roman Hodek for pointing this out.
+ *		B: GCC seems to mess up if one uses too many
+ *		data-registers to hold input values and one tries to
+ *		specify d0 and d1 as scratch registers. Letting gcc
+ *		choose these registers itself solves the problem.
+ *
+ *		This program is free software; you can redistribute it and/or
+ *		modify it under the terms of the GNU General Public License
+ *		as published by the Free Software Foundation; either version
+ *		2 of the License, or (at your option) any later version.
+ */
+
+/* Revised by Kenneth Albanowski for m68knommu. Basic problem: unaligned access
+ kills, so most of the assembly has to go. */
+
+#include <linux/module.h>
+#include <net/checksum.h>
+
+#include <asm/byteorder.h>
+
+static inline unsigned short from32to16(unsigned int x)
+{
+	/* add up 16-bit and 16-bit for 16+c bit */
+	x = (x & 0xffff) + (x >> 16);
+	/* add up carry.. */
+	x = (x & 0xffff) + (x >> 16);
+	return x;
+}
+
+static unsigned int do_csum(const unsigned char *buff, int len)
+{
+	int odd;
+	unsigned int result = 0;
+
+	if (len <= 0)
+		goto out;
+	odd = 1 & (unsigned long) buff;
+	if (odd) {
+#ifdef __LITTLE_ENDIAN
+		result += (*buff << 8);
+#else
+		result = *buff;
+#endif
+		len--;
+		buff++;
+	}
+	if (len >= 2) {
+		if (2 & (unsigned long) buff) {
+			result += *(unsigned short *) buff;
+			len -= 2;
+			buff += 2;
+		}
+		if (len >= 4) {
+			const unsigned char *end = buff + ((unsigned)len & ~3);
+			unsigned int carry = 0;
+			do {
+				unsigned int w = *(unsigned int *) buff;
+				buff += 4;
+				result += carry;
+				result += w;
+				carry = (w > result);
+			} while (buff < end);
+			result += carry;
+			result = (result & 0xffff) + (result >> 16);
+		}
+		if (len & 2) {
+			result += *(unsigned short *) buff;
+			buff += 2;
+		}
+	}
+	if (len & 1)
+#ifdef __LITTLE_ENDIAN
+		result += *buff;
+#else
+		result += (*buff << 8);
+#endif
+	result = from32to16(result);
+	if (odd)
+		result = ((result >> 8) & 0xff) | ((result & 0xff) << 8);
+out:
+	return result;
+}
+EXPORT_SYMBOL(ip_fast_csum);
+
+/*
+ * 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 wsum)
+{
+	unsigned int sum = (__force unsigned int)wsum;
+	unsigned int result = do_csum(buff, len);
+
+	/* add in old sum, and carry.. */
+	result += sum;
+	if (sum > result)
+		result += 1;
+	return (__force __wsum)result;
+}
+EXPORT_SYMBOL(csum_partial);
+
+/*
+ * this routine is used for miscellaneous IP-like checksums, mainly
+ * in icmp.c
+ */
+__sum16 ip_compute_csum(const void *buff, int len)
+{
+	return (__force __sum16)~do_csum(buff, len);
+}
+EXPORT_SYMBOL(ip_compute_csum);
+
+/*
+ * copy from fs while checksumming, otherwise like csum_partial
+ */
+__wsum
+csum_partial_copy_from_user(const void __user *src, void *dst, int len,
+						__wsum sum, int *csum_err)
+{
+	int missing;
+
+	missing = __copy_from_user(dst, src, len);
+	if (missing) {
+		memset(dst + len - missing, 0, missing);
+		*csum_err = -EFAULT;
+	} else
+		*csum_err = 0;
+
+	return csum_partial(dst, len, sum);
+}
+EXPORT_SYMBOL(csum_partial_copy_from_user);
+
+/*
+ * copy from ds while checksumming, otherwise like csum_partial
+ */
+__wsum
+csum_partial_copy(const void *src, void *dst, int len, __wsum sum)
+{
+	memcpy(dst, src, len);
+	return csum_partial(dst, len, sum);
+}
+EXPORT_SYMBOL(csum_partial_copy);

arch/metag/lib/clear_page.S

@@ -0,0 +1,17 @@
+        ! Copyright 2007,2008,2009 Imagination Technologies Ltd.
+
+#include <asm/page.h>
+
+        .text
+        .global	_clear_page
+        .type   _clear_page,function
+	!! D1Ar1 - page
+_clear_page:
+	MOV  TXRPT,#((PAGE_SIZE / 8) - 1)
+	MOV  D0Re0,#0
+	MOV  D1Re0,#0
+$Lclear_page_loop:
+	SETL [D1Ar1++],D0Re0,D1Re0
+	BR   $Lclear_page_loop
+	MOV  PC,D1RtP
+        .size	_clear_page,.-_clear_page