564ec0ec05
Old binutils do not support PCLMULQDQ-NI and PSHUFB, to make kernel can be compiled by them, .byte code is used instead of assembly instructions. But the readability and flexibility of raw .byte code is not good. So corresponding assembly instruction like gas macro is used instead. Signed-off-by: Huang Ying <ying.huang@intel.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
155 lines
3.2 KiB
ArmAsm
155 lines
3.2 KiB
ArmAsm
/*
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* Accelerated GHASH implementation with Intel PCLMULQDQ-NI
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* instructions. This file contains accelerated part of ghash
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* implementation. More information about PCLMULQDQ can be found at:
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*
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* http://software.intel.com/en-us/articles/carry-less-multiplication-and-its-usage-for-computing-the-gcm-mode/
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*
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* Copyright (c) 2009 Intel Corp.
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* Author: Huang Ying <ying.huang@intel.com>
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* Vinodh Gopal
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* Erdinc Ozturk
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* Deniz Karakoyunlu
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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/inst.h>
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.align 16
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.Lbswap_mask:
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.octa 0x000102030405060708090a0b0c0d0e0f
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.Lpoly:
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.octa 0xc2000000000000000000000000000001
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.Ltwo_one:
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.octa 0x00000001000000000000000000000001
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#define DATA %xmm0
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#define SHASH %xmm1
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#define T1 %xmm2
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#define T2 %xmm3
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#define T3 %xmm4
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#define BSWAP %xmm5
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#define IN1 %xmm6
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.text
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/*
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* __clmul_gf128mul_ble: internal ABI
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* input:
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* DATA: operand1
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* SHASH: operand2, hash_key << 1 mod poly
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* output:
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* DATA: operand1 * operand2 mod poly
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* changed:
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* T1
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* T2
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* T3
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*/
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__clmul_gf128mul_ble:
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movaps DATA, T1
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pshufd $0b01001110, DATA, T2
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pshufd $0b01001110, SHASH, T3
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pxor DATA, T2
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pxor SHASH, T3
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PCLMULQDQ 0x00 SHASH DATA # DATA = a0 * b0
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PCLMULQDQ 0x11 SHASH T1 # T1 = a1 * b1
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PCLMULQDQ 0x00 T3 T2 # T2 = (a1 + a0) * (b1 + b0)
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pxor DATA, T2
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pxor T1, T2 # T2 = a0 * b1 + a1 * b0
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movaps T2, T3
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pslldq $8, T3
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psrldq $8, T2
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pxor T3, DATA
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pxor T2, T1 # <T1:DATA> is result of
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# carry-less multiplication
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# first phase of the reduction
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movaps DATA, T3
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psllq $1, T3
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pxor DATA, T3
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psllq $5, T3
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pxor DATA, T3
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psllq $57, T3
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movaps T3, T2
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pslldq $8, T2
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psrldq $8, T3
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pxor T2, DATA
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pxor T3, T1
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# second phase of the reduction
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movaps DATA, T2
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psrlq $5, T2
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pxor DATA, T2
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psrlq $1, T2
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pxor DATA, T2
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psrlq $1, T2
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pxor T2, T1
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pxor T1, DATA
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ret
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/* void clmul_ghash_mul(char *dst, const be128 *shash) */
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ENTRY(clmul_ghash_mul)
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movups (%rdi), DATA
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movups (%rsi), SHASH
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movaps .Lbswap_mask, BSWAP
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PSHUFB_XMM BSWAP DATA
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call __clmul_gf128mul_ble
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PSHUFB_XMM BSWAP DATA
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movups DATA, (%rdi)
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ret
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/*
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* void clmul_ghash_update(char *dst, const char *src, unsigned int srclen,
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* const be128 *shash);
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*/
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ENTRY(clmul_ghash_update)
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cmp $16, %rdx
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jb .Lupdate_just_ret # check length
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movaps .Lbswap_mask, BSWAP
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movups (%rdi), DATA
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movups (%rcx), SHASH
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PSHUFB_XMM BSWAP DATA
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.align 4
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.Lupdate_loop:
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movups (%rsi), IN1
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PSHUFB_XMM BSWAP IN1
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pxor IN1, DATA
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call __clmul_gf128mul_ble
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sub $16, %rdx
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add $16, %rsi
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cmp $16, %rdx
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jge .Lupdate_loop
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PSHUFB_XMM BSWAP DATA
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movups DATA, (%rdi)
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.Lupdate_just_ret:
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ret
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/*
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* void clmul_ghash_setkey(be128 *shash, const u8 *key);
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*
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* Calculate hash_key << 1 mod poly
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*/
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ENTRY(clmul_ghash_setkey)
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movaps .Lbswap_mask, BSWAP
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movups (%rsi), %xmm0
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PSHUFB_XMM BSWAP %xmm0
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movaps %xmm0, %xmm1
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psllq $1, %xmm0
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psrlq $63, %xmm1
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movaps %xmm1, %xmm2
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pslldq $8, %xmm1
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psrldq $8, %xmm2
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por %xmm1, %xmm0
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# reduction
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pshufd $0b00100100, %xmm2, %xmm1
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pcmpeqd .Ltwo_one, %xmm1
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pand .Lpoly, %xmm1
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pxor %xmm1, %xmm0
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movups %xmm0, (%rdi)
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ret
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