| /* |
| * Accelerated CRC32(C) using ARM CRC, NEON and Crypto Extensions instructions |
| * |
| * Copyright (C) 2016 Linaro Ltd <ard.biesheuvel@linaro.org> |
| * |
| * 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. |
| */ |
| |
| /* GPL HEADER START |
| * |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 only, |
| * as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, but |
| * WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License version 2 for more details (a copy is included |
| * in the LICENSE file that accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License |
| * version 2 along with this program; If not, see http://www.gnu.org/licenses |
| * |
| * Please visit http://www.xyratex.com/contact if you need additional |
| * information or have any questions. |
| * |
| * GPL HEADER END |
| */ |
| |
| /* |
| * 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: |
| * https://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> |
| #include <asm/assembler.h> |
| |
| .text |
| .align 6 |
| .arch armv8-a |
| .arch_extension crc |
| .fpu crypto-neon-fp-armv8 |
| |
| .Lcrc32_constants: |
| /* |
| * [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 |
| */ |
| .quad 0x0000000154442bd4 |
| .quad 0x00000001c6e41596 |
| |
| /* |
| * [(x128+32 mod P(x) << 32)]' << 1 = 0x1751997d0 |
| * #define CONSTANT_R3 0x1751997d0LL |
| * |
| * [(x128-32 mod P(x) << 32)]' << 1 = 0x0ccaa009e |
| * #define CONSTANT_R4 0x0ccaa009eLL |
| */ |
| .quad 0x00000001751997d0 |
| .quad 0x00000000ccaa009e |
| |
| /* |
| * [(x64 mod P(x) << 32)]' << 1 = 0x163cd6124 |
| * #define CONSTANT_R5 0x163cd6124LL |
| */ |
| .quad 0x0000000163cd6124 |
| .quad 0x00000000FFFFFFFF |
| |
| /* |
| * #define CRCPOLY_TRUE_LE_FULL 0x1DB710641LL |
| * |
| * Barrett Reduction constant (u64`) = u` = (x**64 / P(x))` |
| * = 0x1F7011641LL |
| * #define CONSTANT_RU 0x1F7011641LL |
| */ |
| .quad 0x00000001DB710641 |
| .quad 0x00000001F7011641 |
| |
| .Lcrc32c_constants: |
| .quad 0x00000000740eef02 |
| .quad 0x000000009e4addf8 |
| .quad 0x00000000f20c0dfe |
| .quad 0x000000014cd00bd6 |
| .quad 0x00000000dd45aab8 |
| .quad 0x00000000FFFFFFFF |
| .quad 0x0000000105ec76f0 |
| .quad 0x00000000dea713f1 |
| |
| dCONSTANTl .req d0 |
| dCONSTANTh .req d1 |
| qCONSTANT .req q0 |
| |
| BUF .req r0 |
| LEN .req r1 |
| CRC .req r2 |
| |
| qzr .req q9 |
| |
| /** |
| * Calculate crc32 |
| * BUF - buffer |
| * LEN - sizeof buffer (multiple of 16 bytes), LEN should be > 63 |
| * CRC - initial crc32 |
| * return %eax crc32 |
| * uint crc32_pmull_le(unsigned char const *buffer, |
| * size_t len, uint crc32) |
| */ |
| ENTRY(crc32_pmull_le) |
| adr r3, .Lcrc32_constants |
| b 0f |
| |
| ENTRY(crc32c_pmull_le) |
| adr r3, .Lcrc32c_constants |
| |
| 0: bic LEN, LEN, #15 |
| vld1.8 {q1-q2}, [BUF, :128]! |
| vld1.8 {q3-q4}, [BUF, :128]! |
| vmov.i8 qzr, #0 |
| vmov.i8 qCONSTANT, #0 |
| vmov.32 dCONSTANTl[0], CRC |
| veor.8 d2, d2, dCONSTANTl |
| sub LEN, LEN, #0x40 |
| cmp LEN, #0x40 |
| blt less_64 |
| |
| vld1.64 {qCONSTANT}, [r3] |
| |
| loop_64: /* 64 bytes Full cache line folding */ |
| sub LEN, LEN, #0x40 |
| |
| vmull.p64 q5, d3, dCONSTANTh |
| vmull.p64 q6, d5, dCONSTANTh |
| vmull.p64 q7, d7, dCONSTANTh |
| vmull.p64 q8, d9, dCONSTANTh |
| |
| vmull.p64 q1, d2, dCONSTANTl |
| vmull.p64 q2, d4, dCONSTANTl |
| vmull.p64 q3, d6, dCONSTANTl |
| vmull.p64 q4, d8, dCONSTANTl |
| |
| veor.8 q1, q1, q5 |
| vld1.8 {q5}, [BUF, :128]! |
| veor.8 q2, q2, q6 |
| vld1.8 {q6}, [BUF, :128]! |
| veor.8 q3, q3, q7 |
| vld1.8 {q7}, [BUF, :128]! |
| veor.8 q4, q4, q8 |
| vld1.8 {q8}, [BUF, :128]! |
| |
| veor.8 q1, q1, q5 |
| veor.8 q2, q2, q6 |
| veor.8 q3, q3, q7 |
| veor.8 q4, q4, q8 |
| |
| cmp LEN, #0x40 |
| bge loop_64 |
| |
| less_64: /* Folding cache line into 128bit */ |
| vldr dCONSTANTl, [r3, #16] |
| vldr dCONSTANTh, [r3, #24] |
| |
| vmull.p64 q5, d3, dCONSTANTh |
| vmull.p64 q1, d2, dCONSTANTl |
| veor.8 q1, q1, q5 |
| veor.8 q1, q1, q2 |
| |
| vmull.p64 q5, d3, dCONSTANTh |
| vmull.p64 q1, d2, dCONSTANTl |
| veor.8 q1, q1, q5 |
| veor.8 q1, q1, q3 |
| |
| vmull.p64 q5, d3, dCONSTANTh |
| vmull.p64 q1, d2, dCONSTANTl |
| veor.8 q1, q1, q5 |
| veor.8 q1, q1, q4 |
| |
| teq LEN, #0 |
| beq fold_64 |
| |
| loop_16: /* Folding rest buffer into 128bit */ |
| subs LEN, LEN, #0x10 |
| |
| vld1.8 {q2}, [BUF, :128]! |
| vmull.p64 q5, d3, dCONSTANTh |
| vmull.p64 q1, d2, dCONSTANTl |
| veor.8 q1, q1, q5 |
| veor.8 q1, q1, q2 |
| |
| bne loop_16 |
| |
| fold_64: |
| /* perform the last 64 bit fold, also adds 32 zeroes |
| * to the input stream */ |
| vmull.p64 q2, d2, dCONSTANTh |
| vext.8 q1, q1, qzr, #8 |
| veor.8 q1, q1, q2 |
| |
| /* final 32-bit fold */ |
| vldr dCONSTANTl, [r3, #32] |
| vldr d6, [r3, #40] |
| vmov.i8 d7, #0 |
| |
| vext.8 q2, q1, qzr, #4 |
| vand.8 d2, d2, d6 |
| vmull.p64 q1, d2, dCONSTANTl |
| veor.8 q1, q1, q2 |
| |
| /* Finish up with the bit-reversed barrett reduction 64 ==> 32 bits */ |
| vldr dCONSTANTl, [r3, #48] |
| vldr dCONSTANTh, [r3, #56] |
| |
| vand.8 q2, q1, q3 |
| vext.8 q2, qzr, q2, #8 |
| vmull.p64 q2, d5, dCONSTANTh |
| vand.8 q2, q2, q3 |
| vmull.p64 q2, d4, dCONSTANTl |
| veor.8 q1, q1, q2 |
| vmov r0, s5 |
| |
| bx lr |
| ENDPROC(crc32_pmull_le) |
| ENDPROC(crc32c_pmull_le) |
| |
| .macro __crc32, c |
| subs ip, r2, #8 |
| bmi .Ltail\c |
| |
| tst r1, #3 |
| bne .Lunaligned\c |
| |
| teq ip, #0 |
| .Laligned8\c: |
| ldrd r2, r3, [r1], #8 |
| ARM_BE8(rev r2, r2 ) |
| ARM_BE8(rev r3, r3 ) |
| crc32\c\()w r0, r0, r2 |
| crc32\c\()w r0, r0, r3 |
| bxeq lr |
| subs ip, ip, #8 |
| bpl .Laligned8\c |
| |
| .Ltail\c: |
| tst ip, #4 |
| beq 2f |
| ldr r3, [r1], #4 |
| ARM_BE8(rev r3, r3 ) |
| crc32\c\()w r0, r0, r3 |
| |
| 2: tst ip, #2 |
| beq 1f |
| ldrh r3, [r1], #2 |
| ARM_BE8(rev16 r3, r3 ) |
| crc32\c\()h r0, r0, r3 |
| |
| 1: tst ip, #1 |
| bxeq lr |
| ldrb r3, [r1] |
| crc32\c\()b r0, r0, r3 |
| bx lr |
| |
| .Lunaligned\c: |
| tst r1, #1 |
| beq 2f |
| ldrb r3, [r1], #1 |
| subs r2, r2, #1 |
| crc32\c\()b r0, r0, r3 |
| |
| tst r1, #2 |
| beq 0f |
| 2: ldrh r3, [r1], #2 |
| subs r2, r2, #2 |
| ARM_BE8(rev16 r3, r3 ) |
| crc32\c\()h r0, r0, r3 |
| |
| 0: subs ip, r2, #8 |
| bpl .Laligned8\c |
| b .Ltail\c |
| .endm |
| |
| .align 5 |
| ENTRY(crc32_armv8_le) |
| __crc32 |
| ENDPROC(crc32_armv8_le) |
| |
| .align 5 |
| ENTRY(crc32c_armv8_le) |
| __crc32 c |
| ENDPROC(crc32c_armv8_le) |
