mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-19 02:04:19 +08:00
de01303553
It seems the SPDX patch script managed to confuse itself.
Fixes: 2eb72d6696 ("treewide: Replace GPLv2 boilerplate/reference with SPDX - gpl-2.0_179.RULE")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
219 lines
5.2 KiB
ArmAsm
219 lines
5.2 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
/*
|
|
* Copyright 2012 Xyratex Technology Limited
|
|
*
|
|
* Using hardware provided PCLMULQDQ instruction to accelerate the CRC32
|
|
* calculation.
|
|
* CRC32 polynomial:0x04c11db7(BE)/0xEDB88320(LE)
|
|
* PCLMULQDQ is a new instruction in Intel SSE4.2, the reference can be found
|
|
* at:
|
|
* http://www.intel.com/products/processor/manuals/
|
|
* Intel(R) 64 and IA-32 Architectures Software Developer's Manual
|
|
* Volume 2B: Instruction Set Reference, N-Z
|
|
*
|
|
* Authors: Gregory Prestas <Gregory_Prestas@us.xyratex.com>
|
|
* Alexander Boyko <Alexander_Boyko@xyratex.com>
|
|
*/
|
|
|
|
#include <linux/linkage.h>
|
|
|
|
|
|
.section .rodata
|
|
.align 16
|
|
/*
|
|
* [x4*128+32 mod P(x) << 32)]' << 1 = 0x154442bd4
|
|
* #define CONSTANT_R1 0x154442bd4LL
|
|
*
|
|
* [(x4*128-32 mod P(x) << 32)]' << 1 = 0x1c6e41596
|
|
* #define CONSTANT_R2 0x1c6e41596LL
|
|
*/
|
|
.Lconstant_R2R1:
|
|
.octa 0x00000001c6e415960000000154442bd4
|
|
/*
|
|
* [(x128+32 mod P(x) << 32)]' << 1 = 0x1751997d0
|
|
* #define CONSTANT_R3 0x1751997d0LL
|
|
*
|
|
* [(x128-32 mod P(x) << 32)]' << 1 = 0x0ccaa009e
|
|
* #define CONSTANT_R4 0x0ccaa009eLL
|
|
*/
|
|
.Lconstant_R4R3:
|
|
.octa 0x00000000ccaa009e00000001751997d0
|
|
/*
|
|
* [(x64 mod P(x) << 32)]' << 1 = 0x163cd6124
|
|
* #define CONSTANT_R5 0x163cd6124LL
|
|
*/
|
|
.Lconstant_R5:
|
|
.octa 0x00000000000000000000000163cd6124
|
|
.Lconstant_mask32:
|
|
.octa 0x000000000000000000000000FFFFFFFF
|
|
/*
|
|
* #define CRCPOLY_TRUE_LE_FULL 0x1DB710641LL
|
|
*
|
|
* Barrett Reduction constant (u64`) = u` = (x**64 / P(x))` = 0x1F7011641LL
|
|
* #define CONSTANT_RU 0x1F7011641LL
|
|
*/
|
|
.Lconstant_RUpoly:
|
|
.octa 0x00000001F701164100000001DB710641
|
|
|
|
#define CONSTANT %xmm0
|
|
|
|
#ifdef __x86_64__
|
|
#define BUF %rdi
|
|
#define LEN %rsi
|
|
#define CRC %edx
|
|
#else
|
|
#define BUF %eax
|
|
#define LEN %edx
|
|
#define CRC %ecx
|
|
#endif
|
|
|
|
|
|
|
|
.text
|
|
/**
|
|
* Calculate crc32
|
|
* BUF - buffer (16 bytes aligned)
|
|
* LEN - sizeof buffer (16 bytes aligned), LEN should be grater than 63
|
|
* CRC - initial crc32
|
|
* return %eax crc32
|
|
* uint crc32_pclmul_le_16(unsigned char const *buffer,
|
|
* size_t len, uint crc32)
|
|
*/
|
|
|
|
SYM_FUNC_START(crc32_pclmul_le_16) /* buffer and buffer size are 16 bytes aligned */
|
|
movdqa (BUF), %xmm1
|
|
movdqa 0x10(BUF), %xmm2
|
|
movdqa 0x20(BUF), %xmm3
|
|
movdqa 0x30(BUF), %xmm4
|
|
movd CRC, CONSTANT
|
|
pxor CONSTANT, %xmm1
|
|
sub $0x40, LEN
|
|
add $0x40, BUF
|
|
cmp $0x40, LEN
|
|
jb less_64
|
|
|
|
#ifdef __x86_64__
|
|
movdqa .Lconstant_R2R1(%rip), CONSTANT
|
|
#else
|
|
movdqa .Lconstant_R2R1, CONSTANT
|
|
#endif
|
|
|
|
loop_64:/* 64 bytes Full cache line folding */
|
|
prefetchnta 0x40(BUF)
|
|
movdqa %xmm1, %xmm5
|
|
movdqa %xmm2, %xmm6
|
|
movdqa %xmm3, %xmm7
|
|
#ifdef __x86_64__
|
|
movdqa %xmm4, %xmm8
|
|
#endif
|
|
pclmulqdq $0x00, CONSTANT, %xmm1
|
|
pclmulqdq $0x00, CONSTANT, %xmm2
|
|
pclmulqdq $0x00, CONSTANT, %xmm3
|
|
#ifdef __x86_64__
|
|
pclmulqdq $0x00, CONSTANT, %xmm4
|
|
#endif
|
|
pclmulqdq $0x11, CONSTANT, %xmm5
|
|
pclmulqdq $0x11, CONSTANT, %xmm6
|
|
pclmulqdq $0x11, CONSTANT, %xmm7
|
|
#ifdef __x86_64__
|
|
pclmulqdq $0x11, CONSTANT, %xmm8
|
|
#endif
|
|
pxor %xmm5, %xmm1
|
|
pxor %xmm6, %xmm2
|
|
pxor %xmm7, %xmm3
|
|
#ifdef __x86_64__
|
|
pxor %xmm8, %xmm4
|
|
#else
|
|
/* xmm8 unsupported for x32 */
|
|
movdqa %xmm4, %xmm5
|
|
pclmulqdq $0x00, CONSTANT, %xmm4
|
|
pclmulqdq $0x11, CONSTANT, %xmm5
|
|
pxor %xmm5, %xmm4
|
|
#endif
|
|
|
|
pxor (BUF), %xmm1
|
|
pxor 0x10(BUF), %xmm2
|
|
pxor 0x20(BUF), %xmm3
|
|
pxor 0x30(BUF), %xmm4
|
|
|
|
sub $0x40, LEN
|
|
add $0x40, BUF
|
|
cmp $0x40, LEN
|
|
jge loop_64
|
|
less_64:/* Folding cache line into 128bit */
|
|
#ifdef __x86_64__
|
|
movdqa .Lconstant_R4R3(%rip), CONSTANT
|
|
#else
|
|
movdqa .Lconstant_R4R3, CONSTANT
|
|
#endif
|
|
prefetchnta (BUF)
|
|
|
|
movdqa %xmm1, %xmm5
|
|
pclmulqdq $0x00, CONSTANT, %xmm1
|
|
pclmulqdq $0x11, CONSTANT, %xmm5
|
|
pxor %xmm5, %xmm1
|
|
pxor %xmm2, %xmm1
|
|
|
|
movdqa %xmm1, %xmm5
|
|
pclmulqdq $0x00, CONSTANT, %xmm1
|
|
pclmulqdq $0x11, CONSTANT, %xmm5
|
|
pxor %xmm5, %xmm1
|
|
pxor %xmm3, %xmm1
|
|
|
|
movdqa %xmm1, %xmm5
|
|
pclmulqdq $0x00, CONSTANT, %xmm1
|
|
pclmulqdq $0x11, CONSTANT, %xmm5
|
|
pxor %xmm5, %xmm1
|
|
pxor %xmm4, %xmm1
|
|
|
|
cmp $0x10, LEN
|
|
jb fold_64
|
|
loop_16:/* Folding rest buffer into 128bit */
|
|
movdqa %xmm1, %xmm5
|
|
pclmulqdq $0x00, CONSTANT, %xmm1
|
|
pclmulqdq $0x11, CONSTANT, %xmm5
|
|
pxor %xmm5, %xmm1
|
|
pxor (BUF), %xmm1
|
|
sub $0x10, LEN
|
|
add $0x10, BUF
|
|
cmp $0x10, LEN
|
|
jge loop_16
|
|
|
|
fold_64:
|
|
/* perform the last 64 bit fold, also adds 32 zeroes
|
|
* to the input stream */
|
|
pclmulqdq $0x01, %xmm1, CONSTANT /* R4 * xmm1.low */
|
|
psrldq $0x08, %xmm1
|
|
pxor CONSTANT, %xmm1
|
|
|
|
/* final 32-bit fold */
|
|
movdqa %xmm1, %xmm2
|
|
#ifdef __x86_64__
|
|
movdqa .Lconstant_R5(%rip), CONSTANT
|
|
movdqa .Lconstant_mask32(%rip), %xmm3
|
|
#else
|
|
movdqa .Lconstant_R5, CONSTANT
|
|
movdqa .Lconstant_mask32, %xmm3
|
|
#endif
|
|
psrldq $0x04, %xmm2
|
|
pand %xmm3, %xmm1
|
|
pclmulqdq $0x00, CONSTANT, %xmm1
|
|
pxor %xmm2, %xmm1
|
|
|
|
/* Finish up with the bit-reversed barrett reduction 64 ==> 32 bits */
|
|
#ifdef __x86_64__
|
|
movdqa .Lconstant_RUpoly(%rip), CONSTANT
|
|
#else
|
|
movdqa .Lconstant_RUpoly, CONSTANT
|
|
#endif
|
|
movdqa %xmm1, %xmm2
|
|
pand %xmm3, %xmm1
|
|
pclmulqdq $0x10, CONSTANT, %xmm1
|
|
pand %xmm3, %xmm1
|
|
pclmulqdq $0x00, CONSTANT, %xmm1
|
|
pxor %xmm2, %xmm1
|
|
pextrd $0x01, %xmm1, %eax
|
|
|
|
RET
|
|
SYM_FUNC_END(crc32_pclmul_le_16)
|