Hexagon: Add checksum functions

Signed-off-by: Richard Kuo <rkuo@codeaurora.org>
Signed-off-by: Linas Vepstas <linas@codeaurora.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 279 insertions, 0 deletions

diff --git a/arch/hexagon/include/asm/checksum.h b/arch/hexagon/include/asm/checksum.h
new file mode 100644
index 000000000000..3ce4ecd44f82
--- /dev/null
+++ b/arch/hexagon/include/asm/checksum.h
@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+#ifndef _ASM_CHECKSUM_H
+#define _ASM_CHECKSUM_H
+
+#define do_csum do_csum
+unsigned int do_csum(const void *voidptr, int len);
+
+/*
+ * 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
+ */
+#define csum_partial_copy_nocheck csum_partial_copy_nocheck
+__wsum csum_partial_copy_nocheck(const void *src, void *dst,
+                                        int len, __wsum sum);
+
+/*
+ * computes the checksum of the TCP/UDP pseudo-header
+ * returns a 16-bit checksum, already complemented
+ */
+#define csum_tcpudp_nofold csum_tcpudp_nofold
+__wsum csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr,
+        unsigned short len, unsigned short proto, __wsum sum);
+
+#define csum_tcpudp_magic csum_tcpudp_magic
+__sum16 csum_tcpudp_magic(unsigned long saddr, unsigned long daddr,
+        unsigned short len, unsigned short proto, __wsum sum);
+
+#include <asm-generic/checksum.h>
+
+#endif
diff --git a/arch/hexagon/include/asm/intrinsics.h b/arch/hexagon/include/asm/intrinsics.h
new file mode 100644
index 000000000000..1c02186d2e9a
--- /dev/null
+++ b/arch/hexagon/include/asm/intrinsics.h
@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+#ifndef _ASM_HEXAGON_INTRINSICS_H
+#define _ASM_HEXAGON_INTRINSICS_H
+
+#define HEXAGON_P_vrmpyhacc_PP  __builtin_HEXAGON_M2_vrmac_s0
+#define HEXAGON_P_vrmpyh_PP     __builtin_HEXAGON_M2_vrmpy_s0
+#define HEXAGON_R_cl0_R         __builtin_HEXAGON_S2_cl0
+
+#endif
diff --git a/arch/hexagon/lib/checksum.c b/arch/hexagon/lib/checksum.c
new file mode 100644
index 000000000000..93005522d52b
--- /dev/null
+++ b/arch/hexagon/lib/checksum.c
@@ -0,0 +1,203 @@
+/*
+ * Checksum functions for Hexagon
+ *
+ * Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+/*  This was derived from arch/alpha/lib/checksum.c  */
+
+
+#include <linux/module.h>
+#include <linux/string.h>
+
+#include <asm/byteorder.h>
+#include <net/checksum.h>
+#include <linux/uaccess.h>
+#include <asm/intrinsics.h>
+
+
+/*  Vector value operations  */
+#define SIGN(x, y)      ((0x8000ULL*x)<<y)
+#define CARRY(x, y)     ((0x0002ULL*x)<<y)
+#define SELECT(x, y)    ((0x0001ULL*x)<<y)
+
+#define VR_NEGATE(a, b, c, d)   (SIGN(a, 48) + SIGN(b, 32) + SIGN(c, 16) \
+        + SIGN(d, 0))
+#define VR_CARRY(a, b, c, d)    (CARRY(a, 48) + CARRY(b, 32) + CARRY(c, 16) \
+        + CARRY(d, 0))
+#define VR_SELECT(a, b, c, d)   (SELECT(a, 48) + SELECT(b, 32) + SELECT(c, 16) \
+        + SELECT(d, 0))
+
+
+/* optimized HEXAGON V3 intrinsic version */
+static inline unsigned short from64to16(u64 x)
+{
+        u64 sum;
+
+        sum = HEXAGON_P_vrmpyh_PP(x^VR_NEGATE(1, 1, 1, 1),
+                             VR_SELECT(1, 1, 1, 1));
+        sum += VR_CARRY(0, 0, 1, 0);
+        sum = HEXAGON_P_vrmpyh_PP(sum, VR_SELECT(0, 0, 1, 1));
+
+        return 0xFFFF & sum;
+}
+
+/*
+ * computes the checksum of the TCP/UDP pseudo-header
+ * returns a 16-bit checksum, already complemented.
+ */
+__sum16 csum_tcpudp_magic(unsigned long saddr, unsigned long daddr,
+                          unsigned short len, unsigned short proto,
+                          __wsum sum)
+{
+        return (__force __sum16)~from64to16(
+                (__force u64)saddr + (__force u64)daddr +
+                (__force u64)sum + ((len + proto) << 8));
+}
+
+__wsum csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr,
+                          unsigned short len, unsigned short proto,
+                          __wsum sum)
+{
+        u64 result;
+
+        result = (__force u64)saddr + (__force u64)daddr +
+                 (__force u64)sum + ((len + proto) << 8);
+
+        /* Fold down to 32-bits so we don't lose in the typedef-less
+           network stack.  */
+        /* 64 to 33 */
+        result = (result & 0xffffffffUL) + (result >> 32);
+        /* 33 to 32 */
+        result = (result & 0xffffffffUL) + (result >> 32);
+        return (__force __wsum)result;
+}
+EXPORT_SYMBOL(csum_tcpudp_nofold);
+
+/*
+ * Do a 64-bit checksum on an arbitrary memory area..
+ *
+ * This isn't a great routine, but it's not _horrible_ either. The
+ * inner loop could be unrolled a bit further, and there are better
+ * ways to do the carry, but this is reasonable.
+ */
+
+/* optimized HEXAGON intrinsic version, with over read fixed */
+unsigned int do_csum(const void *voidptr, int len)
+{
+        u64 sum0, sum1, x0, x1, *ptr8_o, *ptr8_e, *ptr8;
+        int i, start, mid, end, mask;
+        const char *ptr = voidptr;
+        unsigned short *ptr2;
+        unsigned int *ptr4;
+
+        if (len <= 0)
+                return 0;
+
+        start = 0xF & (16-(((int) ptr) & 0xF)) ;
+        mask  = 0x7fffffffUL >> HEXAGON_R_cl0_R(len);
+        start = start & mask ;
+
+        mid = len - start;
+        end = mid & 0xF;
+        mid = mid>>4;
+        sum0 = mid << 18;
+        sum1 = 0;
+
+        if (start & 1)
+                sum0 += (u64) (ptr[0] << 8);
+        ptr2 = (unsigned short *) &ptr[start & 1];
+        if (start & 2)
+                sum1 += (u64) ptr2[0];
+        ptr4 = (unsigned int *) &ptr[start & 3];
+        if (start & 4) {
+                sum0 = HEXAGON_P_vrmpyhacc_PP(sum0,
+                        VR_NEGATE(0, 0, 1, 1)^((u64)ptr4[0]),
+                        VR_SELECT(0, 0, 1, 1));
+                sum0 += VR_SELECT(0, 0, 1, 0);
+        }
+        ptr8 = (u64 *) &ptr[start & 7];
+        if (start & 8) {
+                sum1 = HEXAGON_P_vrmpyhacc_PP(sum1,
+                        VR_NEGATE(1, 1, 1, 1)^(ptr8[0]),
+                        VR_SELECT(1, 1, 1, 1));
+                sum1 += VR_CARRY(0, 0, 1, 0);
+        }
+        ptr8_o = (u64 *) (ptr + start);
+        ptr8_e = (u64 *) (ptr + start + 8);
+
+        if (mid) {
+                x0 = *ptr8_e; ptr8_e += 2;
+                x1 = *ptr8_o; ptr8_o += 2;
+                if (mid > 1)
+                        for (i = 0; i < mid-1; i++) {
+                                sum0 = HEXAGON_P_vrmpyhacc_PP(sum0,
+                                        x0^VR_NEGATE(1, 1, 1, 1),
+                                        VR_SELECT(1, 1, 1, 1));
+                                sum1 = HEXAGON_P_vrmpyhacc_PP(sum1,
+                                        x1^VR_NEGATE(1, 1, 1, 1),
+                                        VR_SELECT(1, 1, 1, 1));
+                                x0 = *ptr8_e; ptr8_e += 2;
+                                x1 = *ptr8_o; ptr8_o += 2;
+                        }
+                sum0 = HEXAGON_P_vrmpyhacc_PP(sum0, x0^VR_NEGATE(1, 1, 1, 1),
+                        VR_SELECT(1, 1, 1, 1));
+                sum1 = HEXAGON_P_vrmpyhacc_PP(sum1, x1^VR_NEGATE(1, 1, 1, 1),
+                        VR_SELECT(1, 1, 1, 1));
+        }
+
+        ptr4 = (unsigned int *) &ptr[start + (mid * 16) + (end & 8)];
+        if (end & 4) {
+                sum1 = HEXAGON_P_vrmpyhacc_PP(sum1,
+                        VR_NEGATE(0, 0, 1, 1)^((u64)ptr4[0]),
+                        VR_SELECT(0, 0, 1, 1));
+                sum1 += VR_SELECT(0, 0, 1, 0);
+        }
+        ptr2 = (unsigned short *) &ptr[start + (mid * 16) + (end & 12)];
+        if (end & 2)
+                sum0 += (u64) ptr2[0];
+
+        if (end & 1)
+                sum1 += (u64) ptr[start + (mid * 16) + (end & 14)];
+
+        ptr8 = (u64 *) &ptr[start + (mid * 16)];
+        if (end & 8) {
+                sum0 = HEXAGON_P_vrmpyhacc_PP(sum0,
+                        VR_NEGATE(1, 1, 1, 1)^(ptr8[0]),
+                        VR_SELECT(1, 1, 1, 1));
+                sum0 += VR_CARRY(0, 0, 1, 0);
+        }
+        sum0 = HEXAGON_P_vrmpyh_PP((sum0+sum1)^VR_NEGATE(0, 0, 0, 1),
+                VR_SELECT(0, 0, 1, 1));
+        sum0 += VR_NEGATE(0, 0, 0, 1);
+        sum0 = HEXAGON_P_vrmpyh_PP(sum0, VR_SELECT(0, 0, 1, 1));
+
+        if (start & 1)
+                sum0 = (sum0 << 8) | (0xFF & (sum0 >> 8));
+
+        return 0xFFFF & sum0;
+}
+
+/*
+ * copy from ds while checksumming, otherwise like csum_partial
+ */
+__wsum
+csum_partial_copy_nocheck(const void *src, void *dst, int len, __wsum sum)
+{
+        memcpy(dst, src, len);
+        return csum_partial(dst, len, sum);
+}