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-rw-r--r--arch/arm64/crypto/nh-neon-core.S103
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diff --git a/arch/arm64/crypto/nh-neon-core.S b/arch/arm64/crypto/nh-neon-core.S
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+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * NH - ε-almost-universal hash function, ARM64 NEON accelerated version
+ *
+ * Copyright 2018 Google LLC
+ *
+ * Author: Eric Biggers <ebiggers@google.com>
+ */
+
+#include <linux/linkage.h>
+
+ KEY .req x0
+ MESSAGE .req x1
+ MESSAGE_LEN .req x2
+ HASH .req x3
+
+ PASS0_SUMS .req v0
+ PASS1_SUMS .req v1
+ PASS2_SUMS .req v2
+ PASS3_SUMS .req v3
+ K0 .req v4
+ K1 .req v5
+ K2 .req v6
+ K3 .req v7
+ T0 .req v8
+ T1 .req v9
+ T2 .req v10
+ T3 .req v11
+ T4 .req v12
+ T5 .req v13
+ T6 .req v14
+ T7 .req v15
+
+.macro _nh_stride k0, k1, k2, k3
+
+ // Load next message stride
+ ld1 {T3.16b}, [MESSAGE], #16
+
+ // Load next key stride
+ ld1 {\k3\().4s}, [KEY], #16
+
+ // Add message words to key words
+ add T0.4s, T3.4s, \k0\().4s
+ add T1.4s, T3.4s, \k1\().4s
+ add T2.4s, T3.4s, \k2\().4s
+ add T3.4s, T3.4s, \k3\().4s
+
+ // Multiply 32x32 => 64 and accumulate
+ mov T4.d[0], T0.d[1]
+ mov T5.d[0], T1.d[1]
+ mov T6.d[0], T2.d[1]
+ mov T7.d[0], T3.d[1]
+ umlal PASS0_SUMS.2d, T0.2s, T4.2s
+ umlal PASS1_SUMS.2d, T1.2s, T5.2s
+ umlal PASS2_SUMS.2d, T2.2s, T6.2s
+ umlal PASS3_SUMS.2d, T3.2s, T7.2s
+.endm
+
+/*
+ * void nh_neon(const u32 *key, const u8 *message, size_t message_len,
+ * u8 hash[NH_HASH_BYTES])
+ *
+ * It's guaranteed that message_len % 16 == 0.
+ */
+ENTRY(nh_neon)
+
+ ld1 {K0.4s,K1.4s}, [KEY], #32
+ movi PASS0_SUMS.2d, #0
+ movi PASS1_SUMS.2d, #0
+ ld1 {K2.4s}, [KEY], #16
+ movi PASS2_SUMS.2d, #0
+ movi PASS3_SUMS.2d, #0
+
+ subs MESSAGE_LEN, MESSAGE_LEN, #64
+ blt .Lloop4_done
+.Lloop4:
+ _nh_stride K0, K1, K2, K3
+ _nh_stride K1, K2, K3, K0
+ _nh_stride K2, K3, K0, K1
+ _nh_stride K3, K0, K1, K2
+ subs MESSAGE_LEN, MESSAGE_LEN, #64
+ bge .Lloop4
+
+.Lloop4_done:
+ ands MESSAGE_LEN, MESSAGE_LEN, #63
+ beq .Ldone
+ _nh_stride K0, K1, K2, K3
+
+ subs MESSAGE_LEN, MESSAGE_LEN, #16
+ beq .Ldone
+ _nh_stride K1, K2, K3, K0
+
+ subs MESSAGE_LEN, MESSAGE_LEN, #16
+ beq .Ldone
+ _nh_stride K2, K3, K0, K1
+
+.Ldone:
+ // Sum the accumulators for each pass, then store the sums to 'hash'
+ addp T0.2d, PASS0_SUMS.2d, PASS1_SUMS.2d
+ addp T1.2d, PASS2_SUMS.2d, PASS3_SUMS.2d
+ st1 {T0.16b,T1.16b}, [HASH]
+ ret
+ENDPROC(nh_neon)