1 files changed, 94 insertions, 0 deletions
diff --git a/arch/arm/crypto/ghash-ce-core.S b/arch/arm/crypto/ghash-ce-core.S
new file mode 100644
index 000000000000..f6ab8bcc9efe
--- /dev/null
+++ b/arch/arm/crypto/ghash-ce-core.S
@@ -0,0 +1,94 @@
+/*
+ * Accelerated GHASH implementation with ARMv8 vmull.p64 instructions.
+ *
+ * Copyright (C) 2015 Linaro Ltd. <ard.biesheuvel@linaro.org>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ */
+
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+
+	SHASH		.req	q0
+	SHASH2		.req	q1
+	T1		.req	q2
+	T2		.req	q3
+	MASK		.req	q4
+	XL		.req	q5
+	XM		.req	q6
+	XH		.req	q7
+	IN1		.req	q7
+
+	SHASH_L		.req	d0
+	SHASH_H		.req	d1
+	SHASH2_L	.req	d2
+	T1_L		.req	d4
+	MASK_L		.req	d8
+	XL_L		.req	d10
+	XL_H		.req	d11
+	XM_L		.req	d12
+	XM_H		.req	d13
+	XH_L		.req	d14
+
+	.text
+	.fpu		crypto-neon-fp-armv8
+
+	/*
+	 * void pmull_ghash_update(int blocks, u64 dg[], const char *src,
+	 *			   struct ghash_key const *k, const char *head)
+	 */
+ENTRY(pmull_ghash_update)
+	vld1.64		{SHASH}, [r3]
+	vld1.64		{XL}, [r1]
+	vmov.i8		MASK, #0xe1
+	vext.8		SHASH2, SHASH, SHASH, #8
+	vshl.u64	MASK, MASK, #57
+	veor		SHASH2, SHASH2, SHASH
+
+	/* do the head block first, if supplied */
+	ldr		ip, [sp]
+	teq		ip, #0
+	beq		0f
+	vld1.64		{T1}, [ip]
+	teq		r0, #0
+	b		1f
+
+0:	vld1.64		{T1}, [r2]!
+	subs		r0, r0, #1
+
+1:	/* multiply XL by SHASH in GF(2^128) */
+#ifndef CONFIG_CPU_BIG_ENDIAN
+	vrev64.8	T1, T1
+#endif
+	vext.8		T2, XL, XL, #8
+	vext.8		IN1, T1, T1, #8
+	veor		T1, T1, T2
+	veor		XL, XL, IN1
+
+	vmull.p64	XH, SHASH_H, XL_H		@ a1 * b1
+	veor		T1, T1, XL
+	vmull.p64	XL, SHASH_L, XL_L		@ a0 * b0
+	vmull.p64	XM, SHASH2_L, T1_L		@ (a1 + a0)(b1 + b0)
+
+	vext.8		T1, XL, XH, #8
+	veor		T2, XL, XH
+	veor		XM, XM, T1
+	veor		XM, XM, T2
+	vmull.p64	T2, XL_L, MASK_L
+
+	vmov		XH_L, XM_H
+	vmov		XM_H, XL_L
+
+	veor		XL, XM, T2
+	vext.8		T2, XL, XL, #8
+	vmull.p64	XL, XL_L, MASK_L
+	veor		T2, T2, XH
+	veor		XL, XL, T2
+
+	bne		0b
+
+	vst1.64		{XL}, [r1]
+	bx		lr
+ENDPROC(pmull_ghash_update)