mirror of https://gitee.com/openkylin/linux.git
467 lines
14 KiB
ArmAsm
467 lines
14 KiB
ArmAsm
/*
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* Implement fast CRC32C with PCLMULQDQ instructions. (x86_64)
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*
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* The white papers on CRC32C calculations with PCLMULQDQ instruction can be
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* downloaded from:
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* http://www.intel.com/content/dam/www/public/us/en/documents/white-papers/crc-iscsi-polynomial-crc32-instruction-paper.pdf
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* http://www.intel.com/content/dam/www/public/us/en/documents/white-papers/fast-crc-computation-paper.pdf
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*
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* Copyright (C) 2012 Intel Corporation.
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*
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* Authors:
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* Wajdi Feghali <wajdi.k.feghali@intel.com>
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* James Guilford <james.guilford@intel.com>
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* David Cote <david.m.cote@intel.com>
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* Tim Chen <tim.c.chen@linux.intel.com>
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <asm/inst.h>
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#include <linux/linkage.h>
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## ISCSI CRC 32 Implementation with crc32 and pclmulqdq Instruction
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.macro LABEL prefix n
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\prefix\n\():
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.endm
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.macro JMPTBL_ENTRY i
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.word crc_\i - crc_array
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.endm
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.macro JNC_LESS_THAN j
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jnc less_than_\j
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.endm
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# Define threshold where buffers are considered "small" and routed to more
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# efficient "by-1" code. This "by-1" code only handles up to 255 bytes, so
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# SMALL_SIZE can be no larger than 255.
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#define SMALL_SIZE 200
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.if (SMALL_SIZE > 255)
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.error "SMALL_ SIZE must be < 256"
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.endif
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# unsigned int crc_pcl(u8 *buffer, int len, unsigned int crc_init);
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ENTRY(crc_pcl)
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#define bufp %rdi
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#define bufp_dw %edi
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#define bufp_w %di
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#define bufp_b %dil
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#define bufptmp %rcx
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#define block_0 %rcx
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#define block_1 %rdx
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#define block_2 %r11
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#define len %rsi
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#define len_dw %esi
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#define len_w %si
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#define len_b %sil
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#define crc_init_arg %rdx
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#define tmp %rbx
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#define crc_init %r8
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#define crc_init_dw %r8d
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#define crc1 %r9
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#define crc2 %r10
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pushq %rbx
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pushq %rdi
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pushq %rsi
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## Move crc_init for Linux to a different
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mov crc_init_arg, crc_init
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################################################################
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## 1) ALIGN:
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################################################################
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mov bufp, bufptmp # rdi = *buf
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neg bufp
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and $7, bufp # calculate the unalignment amount of
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# the address
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je proc_block # Skip if aligned
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## If len is less than 8 and we're unaligned, we need to jump
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## to special code to avoid reading beyond the end of the buffer
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cmp $8, len
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jae do_align
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# less_than_8 expects length in upper 3 bits of len_dw
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# less_than_8_post_shl1 expects length = carryflag * 8 + len_dw[31:30]
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shl $32-3+1, len_dw
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jmp less_than_8_post_shl1
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do_align:
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#### Calculate CRC of unaligned bytes of the buffer (if any)
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movq (bufptmp), tmp # load a quadward from the buffer
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add bufp, bufptmp # align buffer pointer for quadword
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# processing
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sub bufp, len # update buffer length
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align_loop:
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crc32b %bl, crc_init_dw # compute crc32 of 1-byte
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shr $8, tmp # get next byte
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dec bufp
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jne align_loop
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proc_block:
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################################################################
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## 2) PROCESS BLOCKS:
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################################################################
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## compute num of bytes to be processed
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movq len, tmp # save num bytes in tmp
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cmpq $128*24, len
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jae full_block
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continue_block:
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cmpq $SMALL_SIZE, len
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jb small
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## len < 128*24
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movq $2731, %rax # 2731 = ceil(2^16 / 24)
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mul len_dw
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shrq $16, %rax
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## eax contains floor(bytes / 24) = num 24-byte chunks to do
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## process rax 24-byte chunks (128 >= rax >= 0)
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## compute end address of each block
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## block 0 (base addr + RAX * 8)
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## block 1 (base addr + RAX * 16)
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## block 2 (base addr + RAX * 24)
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lea (bufptmp, %rax, 8), block_0
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lea (block_0, %rax, 8), block_1
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lea (block_1, %rax, 8), block_2
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xor crc1, crc1
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xor crc2, crc2
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## branch into array
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lea jump_table(%rip), bufp
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movzxw (bufp, %rax, 2), len
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offset=crc_array-jump_table
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lea offset(bufp, len, 1), bufp
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jmp *bufp
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################################################################
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## 2a) PROCESS FULL BLOCKS:
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################################################################
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full_block:
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movq $128,%rax
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lea 128*8*2(block_0), block_1
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lea 128*8*3(block_0), block_2
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add $128*8*1, block_0
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xor crc1,crc1
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xor crc2,crc2
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# Fall thruogh into top of crc array (crc_128)
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################################################################
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## 3) CRC Array:
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################################################################
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crc_array:
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i=128
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.rept 128-1
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.altmacro
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LABEL crc_ %i
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.noaltmacro
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crc32q -i*8(block_0), crc_init
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crc32q -i*8(block_1), crc1
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crc32q -i*8(block_2), crc2
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i=(i-1)
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.endr
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.altmacro
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LABEL crc_ %i
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.noaltmacro
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crc32q -i*8(block_0), crc_init
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crc32q -i*8(block_1), crc1
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# SKIP crc32 -i*8(block_2), crc2 ; Don't do this one yet
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mov block_2, block_0
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################################################################
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## 4) Combine three results:
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################################################################
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lea (K_table-16)(%rip), bufp # first entry is for idx 1
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shlq $3, %rax # rax *= 8
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subq %rax, tmp # tmp -= rax*8
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shlq $1, %rax
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subq %rax, tmp # tmp -= rax*16
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# (total tmp -= rax*24)
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addq %rax, bufp
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movdqa (bufp), %xmm0 # 2 consts: K1:K2
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movq crc_init, %xmm1 # CRC for block 1
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PCLMULQDQ 0x00,%xmm0,%xmm1 # Multiply by K2
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movq crc1, %xmm2 # CRC for block 2
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PCLMULQDQ 0x10, %xmm0, %xmm2 # Multiply by K1
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pxor %xmm2,%xmm1
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movq %xmm1, %rax
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xor -i*8(block_2), %rax
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mov crc2, crc_init
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crc32 %rax, crc_init
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################################################################
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## 5) Check for end:
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################################################################
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LABEL crc_ 0
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mov tmp, len
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cmp $128*24, tmp
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jae full_block
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cmp $24, tmp
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jae continue_block
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less_than_24:
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shl $32-4, len_dw # less_than_16 expects length
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# in upper 4 bits of len_dw
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jnc less_than_16
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crc32q (bufptmp), crc_init
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crc32q 8(bufptmp), crc_init
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jz do_return
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add $16, bufptmp
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# len is less than 8 if we got here
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# less_than_8 expects length in upper 3 bits of len_dw
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# less_than_8_post_shl1 expects length = carryflag * 8 + len_dw[31:30]
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shl $2, len_dw
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jmp less_than_8_post_shl1
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#######################################################################
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## 6) LESS THAN 256-bytes REMAIN AT THIS POINT (8-bits of len are full)
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#######################################################################
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small:
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shl $32-8, len_dw # Prepare len_dw for less_than_256
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j=256
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.rept 5 # j = {256, 128, 64, 32, 16}
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.altmacro
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LABEL less_than_ %j # less_than_j: Length should be in
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# upper lg(j) bits of len_dw
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j=(j/2)
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shl $1, len_dw # Get next MSB
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JNC_LESS_THAN %j
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.noaltmacro
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i=0
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.rept (j/8)
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crc32q i(bufptmp), crc_init # Compute crc32 of 8-byte data
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i=i+8
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.endr
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jz do_return # Return if remaining length is zero
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add $j, bufptmp # Advance buf
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.endr
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less_than_8: # Length should be stored in
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# upper 3 bits of len_dw
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shl $1, len_dw
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less_than_8_post_shl1:
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jnc less_than_4
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crc32l (bufptmp), crc_init_dw # CRC of 4 bytes
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jz do_return # return if remaining data is zero
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add $4, bufptmp
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less_than_4: # Length should be stored in
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# upper 2 bits of len_dw
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shl $1, len_dw
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jnc less_than_2
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crc32w (bufptmp), crc_init_dw # CRC of 2 bytes
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jz do_return # return if remaining data is zero
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add $2, bufptmp
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less_than_2: # Length should be stored in the MSB
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# of len_dw
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shl $1, len_dw
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jnc less_than_1
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crc32b (bufptmp), crc_init_dw # CRC of 1 byte
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less_than_1: # Length should be zero
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do_return:
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movq crc_init, %rax
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popq %rsi
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popq %rdi
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popq %rbx
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ret
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################################################################
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## jump table Table is 129 entries x 2 bytes each
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################################################################
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.align 4
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jump_table:
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i=0
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.rept 129
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.altmacro
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JMPTBL_ENTRY %i
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.noaltmacro
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i=i+1
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.endr
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ENDPROC(crc_pcl)
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################################################################
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## PCLMULQDQ tables
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## Table is 128 entries x 2 quad words each
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################################################################
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.data
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.align 64
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K_table:
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.quad 0x14cd00bd6,0x105ec76f0
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.quad 0x0ba4fc28e,0x14cd00bd6
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.quad 0x1d82c63da,0x0f20c0dfe
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.quad 0x09e4addf8,0x0ba4fc28e
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.quad 0x039d3b296,0x1384aa63a
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.quad 0x102f9b8a2,0x1d82c63da
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.quad 0x14237f5e6,0x01c291d04
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.quad 0x00d3b6092,0x09e4addf8
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.quad 0x0c96cfdc0,0x0740eef02
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.quad 0x18266e456,0x039d3b296
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.quad 0x0daece73e,0x0083a6eec
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.quad 0x0ab7aff2a,0x102f9b8a2
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.quad 0x1248ea574,0x1c1733996
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.quad 0x083348832,0x14237f5e6
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.quad 0x12c743124,0x02ad91c30
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.quad 0x0b9e02b86,0x00d3b6092
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.quad 0x018b33a4e,0x06992cea2
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.quad 0x1b331e26a,0x0c96cfdc0
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.quad 0x17d35ba46,0x07e908048
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.quad 0x1bf2e8b8a,0x18266e456
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.quad 0x1a3e0968a,0x11ed1f9d8
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.quad 0x0ce7f39f4,0x0daece73e
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.quad 0x061d82e56,0x0f1d0f55e
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.quad 0x0d270f1a2,0x0ab7aff2a
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.quad 0x1c3f5f66c,0x0a87ab8a8
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.quad 0x12ed0daac,0x1248ea574
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.quad 0x065863b64,0x08462d800
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.quad 0x11eef4f8e,0x083348832
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.quad 0x1ee54f54c,0x071d111a8
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.quad 0x0b3e32c28,0x12c743124
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.quad 0x0064f7f26,0x0ffd852c6
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.quad 0x0dd7e3b0c,0x0b9e02b86
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.quad 0x0f285651c,0x0dcb17aa4
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.quad 0x010746f3c,0x018b33a4e
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.quad 0x1c24afea4,0x0f37c5aee
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.quad 0x0271d9844,0x1b331e26a
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.quad 0x08e766a0c,0x06051d5a2
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.quad 0x093a5f730,0x17d35ba46
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.quad 0x06cb08e5c,0x11d5ca20e
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.quad 0x06b749fb2,0x1bf2e8b8a
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.quad 0x1167f94f2,0x021f3d99c
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.quad 0x0cec3662e,0x1a3e0968a
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.quad 0x19329634a,0x08f158014
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.quad 0x0e6fc4e6a,0x0ce7f39f4
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.quad 0x08227bb8a,0x1a5e82106
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.quad 0x0b0cd4768,0x061d82e56
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.quad 0x13c2b89c4,0x188815ab2
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.quad 0x0d7a4825c,0x0d270f1a2
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.quad 0x10f5ff2ba,0x105405f3e
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.quad 0x00167d312,0x1c3f5f66c
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.quad 0x0f6076544,0x0e9adf796
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.quad 0x026f6a60a,0x12ed0daac
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.quad 0x1a2adb74e,0x096638b34
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.quad 0x19d34af3a,0x065863b64
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.quad 0x049c3cc9c,0x1e50585a0
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.quad 0x068bce87a,0x11eef4f8e
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.quad 0x1524fa6c6,0x19f1c69dc
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.quad 0x16cba8aca,0x1ee54f54c
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.quad 0x042d98888,0x12913343e
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.quad 0x1329d9f7e,0x0b3e32c28
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.quad 0x1b1c69528,0x088f25a3a
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.quad 0x02178513a,0x0064f7f26
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.quad 0x0e0ac139e,0x04e36f0b0
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.quad 0x0170076fa,0x0dd7e3b0c
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.quad 0x141a1a2e2,0x0bd6f81f8
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.quad 0x16ad828b4,0x0f285651c
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.quad 0x041d17b64,0x19425cbba
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.quad 0x1fae1cc66,0x010746f3c
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.quad 0x1a75b4b00,0x18db37e8a
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.quad 0x0f872e54c,0x1c24afea4
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.quad 0x01e41e9fc,0x04c144932
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.quad 0x086d8e4d2,0x0271d9844
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.quad 0x160f7af7a,0x052148f02
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.quad 0x05bb8f1bc,0x08e766a0c
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.quad 0x0a90fd27a,0x0a3c6f37a
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.quad 0x0b3af077a,0x093a5f730
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.quad 0x04984d782,0x1d22c238e
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.quad 0x0ca6ef3ac,0x06cb08e5c
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.quad 0x0234e0b26,0x063ded06a
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.quad 0x1d88abd4a,0x06b749fb2
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.quad 0x04597456a,0x04d56973c
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.quad 0x0e9e28eb4,0x1167f94f2
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.quad 0x07b3ff57a,0x19385bf2e
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.quad 0x0c9c8b782,0x0cec3662e
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.quad 0x13a9cba9e,0x0e417f38a
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.quad 0x093e106a4,0x19329634a
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.quad 0x167001a9c,0x14e727980
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.quad 0x1ddffc5d4,0x0e6fc4e6a
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.quad 0x00df04680,0x0d104b8fc
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.quad 0x02342001e,0x08227bb8a
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.quad 0x00a2a8d7e,0x05b397730
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.quad 0x168763fa6,0x0b0cd4768
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.quad 0x1ed5a407a,0x0e78eb416
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.quad 0x0d2c3ed1a,0x13c2b89c4
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.quad 0x0995a5724,0x1641378f0
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.quad 0x19b1afbc4,0x0d7a4825c
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.quad 0x109ffedc0,0x08d96551c
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.quad 0x0f2271e60,0x10f5ff2ba
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.quad 0x00b0bf8ca,0x00bf80dd2
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.quad 0x123888b7a,0x00167d312
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.quad 0x1e888f7dc,0x18dcddd1c
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.quad 0x002ee03b2,0x0f6076544
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.quad 0x183e8d8fe,0x06a45d2b2
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.quad 0x133d7a042,0x026f6a60a
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.quad 0x116b0f50c,0x1dd3e10e8
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.quad 0x05fabe670,0x1a2adb74e
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.quad 0x130004488,0x0de87806c
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.quad 0x000bcf5f6,0x19d34af3a
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.quad 0x18f0c7078,0x014338754
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.quad 0x017f27698,0x049c3cc9c
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.quad 0x058ca5f00,0x15e3e77ee
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.quad 0x1af900c24,0x068bce87a
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.quad 0x0b5cfca28,0x0dd07448e
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.quad 0x0ded288f8,0x1524fa6c6
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.quad 0x059f229bc,0x1d8048348
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.quad 0x06d390dec,0x16cba8aca
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.quad 0x037170390,0x0a3e3e02c
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.quad 0x06353c1cc,0x042d98888
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.quad 0x0c4584f5c,0x0d73c7bea
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.quad 0x1f16a3418,0x1329d9f7e
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.quad 0x0531377e2,0x185137662
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.quad 0x1d8d9ca7c,0x1b1c69528
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.quad 0x0b25b29f2,0x18a08b5bc
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.quad 0x19fb2a8b0,0x02178513a
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.quad 0x1a08fe6ac,0x1da758ae0
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.quad 0x045cddf4e,0x0e0ac139e
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.quad 0x1a91647f2,0x169cf9eb0
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.quad 0x1a0f717c4,0x0170076fa
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