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55d1ecceb8
Move the x86 CRC32 assembly code into the lib directory and wire it up to the library interface. This allows it to be used without going through the crypto API. It remains usable via the crypto API too via the shash algorithms that use the library interface. Thus all the arch-specific "shash" code becomes unnecessary and is removed. Reviewed-by: Ard Biesheuvel <ardb@kernel.org> Link: https://lore.kernel.org/r/20241202010844.144356-14-ebiggers@kernel.org Signed-off-by: Eric Biggers <ebiggers@google.com>
218 lines
5.1 KiB
ArmAsm
218 lines
5.1 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright 2012 Xyratex Technology Limited
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*
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* Using hardware provided PCLMULQDQ instruction to accelerate the CRC32
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* calculation.
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* CRC32 polynomial:0x04c11db7(BE)/0xEDB88320(LE)
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* PCLMULQDQ is a new instruction in Intel SSE4.2, the reference can be found
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* at:
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* http://www.intel.com/products/processor/manuals/
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* Intel(R) 64 and IA-32 Architectures Software Developer's Manual
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* Volume 2B: Instruction Set Reference, N-Z
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*
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* Authors: Gregory Prestas <Gregory_Prestas@us.xyratex.com>
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* Alexander Boyko <Alexander_Boyko@xyratex.com>
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*/
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#include <linux/linkage.h>
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.section .rodata
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.align 16
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/*
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* [x4*128+32 mod P(x) << 32)]' << 1 = 0x154442bd4
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* #define CONSTANT_R1 0x154442bd4LL
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*
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* [(x4*128-32 mod P(x) << 32)]' << 1 = 0x1c6e41596
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* #define CONSTANT_R2 0x1c6e41596LL
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*/
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.Lconstant_R2R1:
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.octa 0x00000001c6e415960000000154442bd4
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/*
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* [(x128+32 mod P(x) << 32)]' << 1 = 0x1751997d0
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* #define CONSTANT_R3 0x1751997d0LL
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*
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* [(x128-32 mod P(x) << 32)]' << 1 = 0x0ccaa009e
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* #define CONSTANT_R4 0x0ccaa009eLL
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*/
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.Lconstant_R4R3:
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.octa 0x00000000ccaa009e00000001751997d0
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/*
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* [(x64 mod P(x) << 32)]' << 1 = 0x163cd6124
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* #define CONSTANT_R5 0x163cd6124LL
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*/
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.Lconstant_R5:
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.octa 0x00000000000000000000000163cd6124
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.Lconstant_mask32:
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.octa 0x000000000000000000000000FFFFFFFF
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/*
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* #define CRCPOLY_TRUE_LE_FULL 0x1DB710641LL
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*
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* Barrett Reduction constant (u64`) = u` = (x**64 / P(x))` = 0x1F7011641LL
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* #define CONSTANT_RU 0x1F7011641LL
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*/
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.Lconstant_RUpoly:
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.octa 0x00000001F701164100000001DB710641
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#define CONSTANT %xmm0
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#ifdef __x86_64__
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#define CRC %edi
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#define BUF %rsi
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#define LEN %rdx
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#else
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#define CRC %eax
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#define BUF %edx
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#define LEN %ecx
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#endif
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.text
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/**
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* Calculate crc32
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* CRC - initial crc32
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* BUF - buffer (16 bytes aligned)
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* LEN - sizeof buffer (16 bytes aligned), LEN should be greater than 63
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* return %eax crc32
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* u32 crc32_pclmul_le_16(u32 crc, const u8 *buffer, size_t len);
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*/
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SYM_FUNC_START(crc32_pclmul_le_16) /* buffer and buffer size are 16 bytes aligned */
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movdqa (BUF), %xmm1
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movdqa 0x10(BUF), %xmm2
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movdqa 0x20(BUF), %xmm3
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movdqa 0x30(BUF), %xmm4
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movd CRC, CONSTANT
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pxor CONSTANT, %xmm1
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sub $0x40, LEN
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add $0x40, BUF
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cmp $0x40, LEN
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jb .Lless_64
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#ifdef __x86_64__
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movdqa .Lconstant_R2R1(%rip), CONSTANT
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#else
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movdqa .Lconstant_R2R1, CONSTANT
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#endif
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.Lloop_64:/* 64 bytes Full cache line folding */
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prefetchnta 0x40(BUF)
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movdqa %xmm1, %xmm5
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movdqa %xmm2, %xmm6
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movdqa %xmm3, %xmm7
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#ifdef __x86_64__
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movdqa %xmm4, %xmm8
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#endif
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pclmulqdq $0x00, CONSTANT, %xmm1
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pclmulqdq $0x00, CONSTANT, %xmm2
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pclmulqdq $0x00, CONSTANT, %xmm3
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#ifdef __x86_64__
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pclmulqdq $0x00, CONSTANT, %xmm4
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#endif
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pclmulqdq $0x11, CONSTANT, %xmm5
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pclmulqdq $0x11, CONSTANT, %xmm6
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pclmulqdq $0x11, CONSTANT, %xmm7
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#ifdef __x86_64__
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pclmulqdq $0x11, CONSTANT, %xmm8
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#endif
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pxor %xmm5, %xmm1
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pxor %xmm6, %xmm2
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pxor %xmm7, %xmm3
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#ifdef __x86_64__
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pxor %xmm8, %xmm4
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#else
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/* xmm8 unsupported for x32 */
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movdqa %xmm4, %xmm5
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pclmulqdq $0x00, CONSTANT, %xmm4
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pclmulqdq $0x11, CONSTANT, %xmm5
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pxor %xmm5, %xmm4
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#endif
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pxor (BUF), %xmm1
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pxor 0x10(BUF), %xmm2
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pxor 0x20(BUF), %xmm3
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pxor 0x30(BUF), %xmm4
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sub $0x40, LEN
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add $0x40, BUF
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cmp $0x40, LEN
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jge .Lloop_64
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.Lless_64:/* Folding cache line into 128bit */
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#ifdef __x86_64__
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movdqa .Lconstant_R4R3(%rip), CONSTANT
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#else
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movdqa .Lconstant_R4R3, CONSTANT
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#endif
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prefetchnta (BUF)
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movdqa %xmm1, %xmm5
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pclmulqdq $0x00, CONSTANT, %xmm1
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pclmulqdq $0x11, CONSTANT, %xmm5
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pxor %xmm5, %xmm1
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pxor %xmm2, %xmm1
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movdqa %xmm1, %xmm5
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pclmulqdq $0x00, CONSTANT, %xmm1
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pclmulqdq $0x11, CONSTANT, %xmm5
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pxor %xmm5, %xmm1
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pxor %xmm3, %xmm1
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movdqa %xmm1, %xmm5
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pclmulqdq $0x00, CONSTANT, %xmm1
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pclmulqdq $0x11, CONSTANT, %xmm5
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pxor %xmm5, %xmm1
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pxor %xmm4, %xmm1
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cmp $0x10, LEN
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jb .Lfold_64
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.Lloop_16:/* Folding rest buffer into 128bit */
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movdqa %xmm1, %xmm5
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pclmulqdq $0x00, CONSTANT, %xmm1
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pclmulqdq $0x11, CONSTANT, %xmm5
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pxor %xmm5, %xmm1
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pxor (BUF), %xmm1
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sub $0x10, LEN
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add $0x10, BUF
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cmp $0x10, LEN
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jge .Lloop_16
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.Lfold_64:
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/* perform the last 64 bit fold, also adds 32 zeroes
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* to the input stream */
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pclmulqdq $0x01, %xmm1, CONSTANT /* R4 * xmm1.low */
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psrldq $0x08, %xmm1
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pxor CONSTANT, %xmm1
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/* final 32-bit fold */
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movdqa %xmm1, %xmm2
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#ifdef __x86_64__
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movdqa .Lconstant_R5(%rip), CONSTANT
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movdqa .Lconstant_mask32(%rip), %xmm3
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#else
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movdqa .Lconstant_R5, CONSTANT
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movdqa .Lconstant_mask32, %xmm3
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#endif
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psrldq $0x04, %xmm2
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pand %xmm3, %xmm1
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pclmulqdq $0x00, CONSTANT, %xmm1
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pxor %xmm2, %xmm1
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/* Finish up with the bit-reversed barrett reduction 64 ==> 32 bits */
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#ifdef __x86_64__
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movdqa .Lconstant_RUpoly(%rip), CONSTANT
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#else
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movdqa .Lconstant_RUpoly, CONSTANT
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#endif
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movdqa %xmm1, %xmm2
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pand %xmm3, %xmm1
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pclmulqdq $0x10, CONSTANT, %xmm1
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pand %xmm3, %xmm1
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pclmulqdq $0x00, CONSTANT, %xmm1
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pxor %xmm2, %xmm1
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pextrd $0x01, %xmm1, %eax
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RET
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SYM_FUNC_END(crc32_pclmul_le_16)
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