https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: b953c0d234bc72e8489d3bf51a276c5c4ec85345 authored by Linus Torvalds on 22 June 2015, 05:05:43 UTC
Linux 4.1
Linux 4.1
Tip revision: b953c0d
ghash-ce-core.S
/*
* Accelerated GHASH implementation with ARMv8 PMULL instructions.
*
* Copyright (C) 2014 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 v0
SHASH2 .req v1
T1 .req v2
T2 .req v3
MASK .req v4
XL .req v5
XM .req v6
XH .req v7
IN1 .req v7
.text
.arch armv8-a+crypto
/*
* void pmull_ghash_update(int blocks, u64 dg[], const char *src,
* struct ghash_key const *k, const char *head)
*/
ENTRY(pmull_ghash_update)
ld1 {SHASH.16b}, [x3]
ld1 {XL.16b}, [x1]
movi MASK.16b, #0xe1
ext SHASH2.16b, SHASH.16b, SHASH.16b, #8
shl MASK.2d, MASK.2d, #57
eor SHASH2.16b, SHASH2.16b, SHASH.16b
/* do the head block first, if supplied */
cbz x4, 0f
ld1 {T1.2d}, [x4]
b 1f
0: ld1 {T1.2d}, [x2], #16
sub w0, w0, #1
1: /* multiply XL by SHASH in GF(2^128) */
CPU_LE( rev64 T1.16b, T1.16b )
ext T2.16b, XL.16b, XL.16b, #8
ext IN1.16b, T1.16b, T1.16b, #8
eor T1.16b, T1.16b, T2.16b
eor XL.16b, XL.16b, IN1.16b
pmull2 XH.1q, SHASH.2d, XL.2d // a1 * b1
eor T1.16b, T1.16b, XL.16b
pmull XL.1q, SHASH.1d, XL.1d // a0 * b0
pmull XM.1q, SHASH2.1d, T1.1d // (a1 + a0)(b1 + b0)
ext T1.16b, XL.16b, XH.16b, #8
eor T2.16b, XL.16b, XH.16b
eor XM.16b, XM.16b, T1.16b
eor XM.16b, XM.16b, T2.16b
pmull T2.1q, XL.1d, MASK.1d
mov XH.d[0], XM.d[1]
mov XM.d[1], XL.d[0]
eor XL.16b, XM.16b, T2.16b
ext T2.16b, XL.16b, XL.16b, #8
pmull XL.1q, XL.1d, MASK.1d
eor T2.16b, T2.16b, XH.16b
eor XL.16b, XL.16b, T2.16b
cbnz w0, 0b
st1 {XL.16b}, [x1]
ret
ENDPROC(pmull_ghash_update)