1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2012 Intel Corporation 4 * Copyright (C) 2017 Linaro Ltd. <ard.biesheuvel@linaro.org> 5 */ 6 7 #include <arm_neon.h> 8 9 #ifdef CONFIG_ARM 10 /* 11 * AArch32 does not provide this intrinsic natively because it does not 12 * implement the underlying instruction. AArch32 only provides a 64-bit 13 * wide vtbl.8 instruction, so use that instead. 14 */ 15 static uint8x16_t vqtbl1q_u8(uint8x16_t a, uint8x16_t b) 16 { 17 union { 18 uint8x16_t val; 19 uint8x8x2_t pair; 20 } __a = { a }; 21 22 return vcombine_u8(vtbl2_u8(__a.pair, vget_low_u8(b)), 23 vtbl2_u8(__a.pair, vget_high_u8(b))); 24 } 25 #endif 26 27 void __raid6_2data_recov_neon(int bytes, uint8_t *p, uint8_t *q, uint8_t *dp, 28 uint8_t *dq, const uint8_t *pbmul, 29 const uint8_t *qmul) 30 { 31 uint8x16_t pm0 = vld1q_u8(pbmul); 32 uint8x16_t pm1 = vld1q_u8(pbmul + 16); 33 uint8x16_t qm0 = vld1q_u8(qmul); 34 uint8x16_t qm1 = vld1q_u8(qmul + 16); 35 uint8x16_t x0f = vdupq_n_u8(0x0f); 36 37 /* 38 * while ( bytes-- ) { 39 * uint8_t px, qx, db; 40 * 41 * px = *p ^ *dp; 42 * qx = qmul[*q ^ *dq]; 43 * *dq++ = db = pbmul[px] ^ qx; 44 * *dp++ = db ^ px; 45 * p++; q++; 46 * } 47 */ 48 49 while (bytes) { 50 uint8x16_t vx, vy, px, qx, db; 51 52 px = veorq_u8(vld1q_u8(p), vld1q_u8(dp)); 53 vx = veorq_u8(vld1q_u8(q), vld1q_u8(dq)); 54 55 vy = vshrq_n_u8(vx, 4); 56 vx = vqtbl1q_u8(qm0, vandq_u8(vx, x0f)); 57 vy = vqtbl1q_u8(qm1, vy); 58 qx = veorq_u8(vx, vy); 59 60 vy = vshrq_n_u8(px, 4); 61 vx = vqtbl1q_u8(pm0, vandq_u8(px, x0f)); 62 vy = vqtbl1q_u8(pm1, vy); 63 vx = veorq_u8(vx, vy); 64 db = veorq_u8(vx, qx); 65 66 vst1q_u8(dq, db); 67 vst1q_u8(dp, veorq_u8(db, px)); 68 69 bytes -= 16; 70 p += 16; 71 q += 16; 72 dp += 16; 73 dq += 16; 74 } 75 } 76 77 void __raid6_datap_recov_neon(int bytes, uint8_t *p, uint8_t *q, uint8_t *dq, 78 const uint8_t *qmul) 79 { 80 uint8x16_t qm0 = vld1q_u8(qmul); 81 uint8x16_t qm1 = vld1q_u8(qmul + 16); 82 uint8x16_t x0f = vdupq_n_u8(0x0f); 83 84 /* 85 * while (bytes--) { 86 * *p++ ^= *dq = qmul[*q ^ *dq]; 87 * q++; dq++; 88 * } 89 */ 90 91 while (bytes) { 92 uint8x16_t vx, vy; 93 94 vx = veorq_u8(vld1q_u8(q), vld1q_u8(dq)); 95 96 vy = vshrq_n_u8(vx, 4); 97 vx = vqtbl1q_u8(qm0, vandq_u8(vx, x0f)); 98 vy = vqtbl1q_u8(qm1, vy); 99 vx = veorq_u8(vx, vy); 100 vy = veorq_u8(vx, vld1q_u8(p)); 101 102 vst1q_u8(dq, vx); 103 vst1q_u8(p, vy); 104 105 bytes -= 16; 106 p += 16; 107 q += 16; 108 dq += 16; 109 } 110 } 111