| /* |
| * Accelerated GHASH implementation with Intel PCLMULQDQ-NI |
| * instructions. This file contains accelerated part of ghash |
| * implementation. More information about PCLMULQDQ can be found at: |
| * |
| * http://software.intel.com/en-us/articles/carry-less-multiplication-and-its-usage-for-computing-the-gcm-mode/ |
| * |
| * Copyright (c) 2009 Intel Corp. |
| * Author: Huang Ying <ying.huang@intel.com> |
| * Vinodh Gopal |
| * Erdinc Ozturk |
| * Deniz Karakoyunlu |
| * |
| * 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/inst.h> |
| #include <asm/frame.h> |
| |
| .section .rodata.cst16.bswap_mask, "aM", @progbits, 16 |
| .align 16 |
| .Lbswap_mask: |
| .octa 0x000102030405060708090a0b0c0d0e0f |
| |
| #define DATA %xmm0 |
| #define SHASH %xmm1 |
| #define T1 %xmm2 |
| #define T2 %xmm3 |
| #define T3 %xmm4 |
| #define BSWAP %xmm5 |
| #define IN1 %xmm6 |
| |
| .text |
| |
| /* |
| * __clmul_gf128mul_ble: internal ABI |
| * input: |
| * DATA: operand1 |
| * SHASH: operand2, hash_key << 1 mod poly |
| * output: |
| * DATA: operand1 * operand2 mod poly |
| * changed: |
| * T1 |
| * T2 |
| * T3 |
| */ |
| __clmul_gf128mul_ble: |
| movaps DATA, T1 |
| pshufd $0b01001110, DATA, T2 |
| pshufd $0b01001110, SHASH, T3 |
| pxor DATA, T2 |
| pxor SHASH, T3 |
| |
| PCLMULQDQ 0x00 SHASH DATA # DATA = a0 * b0 |
| PCLMULQDQ 0x11 SHASH T1 # T1 = a1 * b1 |
| PCLMULQDQ 0x00 T3 T2 # T2 = (a1 + a0) * (b1 + b0) |
| pxor DATA, T2 |
| pxor T1, T2 # T2 = a0 * b1 + a1 * b0 |
| |
| movaps T2, T3 |
| pslldq $8, T3 |
| psrldq $8, T2 |
| pxor T3, DATA |
| pxor T2, T1 # <T1:DATA> is result of |
| # carry-less multiplication |
| |
| # first phase of the reduction |
| movaps DATA, T3 |
| psllq $1, T3 |
| pxor DATA, T3 |
| psllq $5, T3 |
| pxor DATA, T3 |
| psllq $57, T3 |
| movaps T3, T2 |
| pslldq $8, T2 |
| psrldq $8, T3 |
| pxor T2, DATA |
| pxor T3, T1 |
| |
| # second phase of the reduction |
| movaps DATA, T2 |
| psrlq $5, T2 |
| pxor DATA, T2 |
| psrlq $1, T2 |
| pxor DATA, T2 |
| psrlq $1, T2 |
| pxor T2, T1 |
| pxor T1, DATA |
| ret |
| ENDPROC(__clmul_gf128mul_ble) |
| |
| /* void clmul_ghash_mul(char *dst, const u128 *shash) */ |
| ENTRY(clmul_ghash_mul) |
| FRAME_BEGIN |
| movups (%rdi), DATA |
| movups (%rsi), SHASH |
| movaps .Lbswap_mask, BSWAP |
| PSHUFB_XMM BSWAP DATA |
| call __clmul_gf128mul_ble |
| PSHUFB_XMM BSWAP DATA |
| movups DATA, (%rdi) |
| FRAME_END |
| ret |
| ENDPROC(clmul_ghash_mul) |
| |
| /* |
| * void clmul_ghash_update(char *dst, const char *src, unsigned int srclen, |
| * const u128 *shash); |
| */ |
| ENTRY(clmul_ghash_update) |
| FRAME_BEGIN |
| cmp $16, %rdx |
| jb .Lupdate_just_ret # check length |
| movaps .Lbswap_mask, BSWAP |
| movups (%rdi), DATA |
| movups (%rcx), SHASH |
| PSHUFB_XMM BSWAP DATA |
| .align 4 |
| .Lupdate_loop: |
| movups (%rsi), IN1 |
| PSHUFB_XMM BSWAP IN1 |
| pxor IN1, DATA |
| call __clmul_gf128mul_ble |
| sub $16, %rdx |
| add $16, %rsi |
| cmp $16, %rdx |
| jge .Lupdate_loop |
| PSHUFB_XMM BSWAP DATA |
| movups DATA, (%rdi) |
| .Lupdate_just_ret: |
| FRAME_END |
| ret |
| ENDPROC(clmul_ghash_update) |
