1 /* $NetBSD: chacha_neon_impl.c,v 1.2 2020/10/10 08:24:10 jmcneill Exp $ */ 2 3 /*- 4 * Copyright (c) 2020 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __KERNEL_RCSID(1, "$NetBSD: chacha_neon_impl.c,v 1.2 2020/10/10 08:24:10 jmcneill Exp $"); 31 32 #include "chacha_neon.h" 33 34 #ifdef __aarch64__ 35 #include <aarch64/armreg.h> 36 #endif 37 38 #ifdef _KERNEL 39 #include <sys/proc.h> 40 #ifndef __aarch64__ 41 #include <arm/locore.h> 42 #endif 43 #include <arm/fpu.h> 44 #else 45 #include <sys/sysctl.h> 46 #include <stddef.h> 47 #define fpu_kern_enter() ((void)0) 48 #define fpu_kern_leave() ((void)0) 49 #endif 50 51 static void 52 chacha_core_neon_impl(uint8_t out[restrict static 64], 53 const uint8_t in[static 16], 54 const uint8_t k[static 32], 55 const uint8_t c[static 16], 56 unsigned nr) 57 { 58 59 fpu_kern_enter(); 60 chacha_core_neon(out, in, k, c, nr); 61 fpu_kern_leave(); 62 } 63 64 static void 65 hchacha_neon_impl(uint8_t out[restrict static 32], 66 const uint8_t in[static 16], 67 const uint8_t k[static 32], 68 const uint8_t c[static 16], 69 unsigned nr) 70 { 71 72 fpu_kern_enter(); 73 hchacha_neon(out, in, k, c, nr); 74 fpu_kern_leave(); 75 } 76 77 static void 78 chacha_stream_neon_impl(uint8_t *restrict s, size_t nbytes, uint32_t blkno, 79 const uint8_t nonce[static 12], 80 const uint8_t key[static 32], 81 unsigned nr) 82 { 83 84 fpu_kern_enter(); 85 chacha_stream_neon(s, nbytes, blkno, nonce, key, nr); 86 fpu_kern_leave(); 87 } 88 89 static void 90 chacha_stream_xor_neon_impl(uint8_t *c, const uint8_t *p, size_t nbytes, 91 uint32_t blkno, 92 const uint8_t nonce[static 12], 93 const uint8_t key[static 32], 94 unsigned nr) 95 { 96 97 fpu_kern_enter(); 98 chacha_stream_xor_neon(c, p, nbytes, blkno, nonce, key, nr); 99 fpu_kern_leave(); 100 } 101 102 static void 103 xchacha_stream_neon_impl(uint8_t *restrict s, size_t nbytes, uint32_t blkno, 104 const uint8_t nonce[static 24], 105 const uint8_t key[static 32], 106 unsigned nr) 107 { 108 109 fpu_kern_enter(); 110 xchacha_stream_neon(s, nbytes, blkno, nonce, key, nr); 111 fpu_kern_leave(); 112 } 113 114 static void 115 xchacha_stream_xor_neon_impl(uint8_t *c, const uint8_t *p, size_t nbytes, 116 uint32_t blkno, 117 const uint8_t nonce[static 24], 118 const uint8_t key[static 32], 119 unsigned nr) 120 { 121 122 fpu_kern_enter(); 123 xchacha_stream_xor_neon(c, p, nbytes, blkno, nonce, key, nr); 124 fpu_kern_leave(); 125 } 126 127 static int 128 chacha_probe_neon(void) 129 { 130 #ifdef __aarch64__ 131 struct aarch64_sysctl_cpu_id *id; 132 #endif 133 int result = 0; 134 135 /* Verify that the CPU supports NEON. */ 136 #ifdef __aarch64__ 137 #ifdef _KERNEL 138 id = &curcpu()->ci_id; 139 #else 140 struct aarch64_sysctl_cpu_id ids; 141 size_t idlen; 142 id = &ids; 143 idlen = sizeof ids; 144 if (sysctlbyname("machdep.cpu0.cpu_id", id, &idlen, NULL, 0)) 145 return -1; 146 if (idlen != sizeof ids) 147 return -1; 148 #endif 149 switch (__SHIFTOUT(id->ac_aa64pfr0, ID_AA64PFR0_EL1_ADVSIMD)) { 150 case ID_AA64PFR0_EL1_ADV_SIMD_NONE: 151 return -1; 152 default: 153 break; 154 } 155 #else 156 #ifdef _KERNEL 157 if (!cpu_neon_present) 158 return -1; 159 #else 160 int neon; 161 size_t neonlen = sizeof neon; 162 if (sysctlbyname("machdep.neon_present", &neon, &neonlen, NULL, 0)) 163 return -1; 164 if (!neon) 165 return -1; 166 #endif 167 #endif 168 169 return result; 170 } 171 172 const struct chacha_impl chacha_neon_impl = { 173 .ci_name = "ARM NEON ChaCha", 174 .ci_probe = chacha_probe_neon, 175 .ci_chacha_core = chacha_core_neon_impl, 176 .ci_hchacha = hchacha_neon_impl, 177 .ci_chacha_stream = chacha_stream_neon_impl, 178 .ci_chacha_stream_xor = chacha_stream_xor_neon_impl, 179 .ci_xchacha_stream = xchacha_stream_neon_impl, 180 .ci_xchacha_stream_xor = xchacha_stream_xor_neon_impl, 181 }; 182
Indexes created Sat Sep 20 22:09:52 GMT 2025