2015-03-10 09:47:48 +01:00
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/*
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* Accelerated GHASH implementation with ARMv8 vmull.p64 instructions.
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*
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* Copyright (C) 2015 Linaro Ltd. <ard.biesheuvel@linaro.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*/
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#include <linux/linkage.h>
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#include <asm/assembler.h>
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SHASH .req q0
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SHASH2 .req q1
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T1 .req q2
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T2 .req q3
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MASK .req q4
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XL .req q5
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XM .req q6
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XH .req q7
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IN1 .req q7
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SHASH_L .req d0
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SHASH_H .req d1
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SHASH2_L .req d2
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T1_L .req d4
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MASK_L .req d8
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XL_L .req d10
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XL_H .req d11
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XM_L .req d12
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XM_H .req d13
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XH_L .req d14
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.text
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.fpu crypto-neon-fp-armv8
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/*
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* void pmull_ghash_update(int blocks, u64 dg[], const char *src,
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* struct ghash_key const *k, const char *head)
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*/
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ENTRY(pmull_ghash_update)
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2015-03-23 21:33:09 +01:00
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vld1.64 {SHASH}, [r3]
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2015-03-10 09:47:48 +01:00
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vld1.64 {XL}, [r1]
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vmov.i8 MASK, #0xe1
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vext.8 SHASH2, SHASH, SHASH, #8
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vshl.u64 MASK, MASK, #57
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veor SHASH2, SHASH2, SHASH
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/* do the head block first, if supplied */
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ldr ip, [sp]
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teq ip, #0
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beq 0f
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vld1.64 {T1}, [ip]
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teq r0, #0
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b 1f
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0: vld1.64 {T1}, [r2]!
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subs r0, r0, #1
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1: /* multiply XL by SHASH in GF(2^128) */
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#ifndef CONFIG_CPU_BIG_ENDIAN
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vrev64.8 T1, T1
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#endif
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vext.8 T2, XL, XL, #8
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vext.8 IN1, T1, T1, #8
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veor T1, T1, T2
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veor XL, XL, IN1
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vmull.p64 XH, SHASH_H, XL_H @ a1 * b1
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veor T1, T1, XL
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vmull.p64 XL, SHASH_L, XL_L @ a0 * b0
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vmull.p64 XM, SHASH2_L, T1_L @ (a1 + a0)(b1 + b0)
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vext.8 T1, XL, XH, #8
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veor T2, XL, XH
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veor XM, XM, T1
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veor XM, XM, T2
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vmull.p64 T2, XL_L, MASK_L
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vmov XH_L, XM_H
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vmov XM_H, XL_L
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veor XL, XM, T2
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vext.8 T2, XL, XL, #8
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vmull.p64 XL, XL_L, MASK_L
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veor T2, T2, XH
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veor XL, XL, T2
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bne 0b
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vst1.64 {XL}, [r1]
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bx lr
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ENDPROC(pmull_ghash_update)
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