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1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3  *
4  * Copyright (c) 2020 Netflix, Inc
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  * 1. Redistributions of source code must retain the above copyright
10  *    notice, this list of conditions and the following disclaimer,
11  *    without modification.
12  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
13  *    similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
14  *    redistribution must be conditioned upon including a substantially
15  *    similar Disclaimer requirement for further binary redistribution.
16  *
17  * NO WARRANTY
18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20  * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
21  * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
22  * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY,
23  * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
26  * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
28  * THE POSSIBILITY OF SUCH DAMAGES.
29  *
30  * $FreeBSD$
31  */
32
33 #include <sys/types.h>
34 #include <sys/systm.h>
35
36 #include <machine/cpufunc.h>
37 #include <machine/md_var.h>
38 #include <x86/cputypes.h>
39 #include <x86/specialreg.h>
40
41 #include <crypto/openssl/ossl.h>
42 #include <crypto/openssl/ossl_cipher.h>
43
44 /*
45  * See OPENSSL_ia32cap(3).
46  *
47  * [0] = cpu_feature but with a few custom bits
48  * [1] = cpu_feature2 but with AMD XOP in bit 11
49  * [2] = cpu_stdext_feature
50  * [3] = 0
51  */
52 unsigned int OPENSSL_ia32cap_P[4];
53 #define AESNI_CAPABLE   (OPENSSL_ia32cap_P[1]&(1<<(57-32)))
54
55 ossl_cipher_setkey_t aesni_set_encrypt_key;
56 ossl_cipher_setkey_t aesni_set_decrypt_key;
57
58 void
59 ossl_cpuid(struct ossl_softc *sc)
60 {
61         uint64_t xcr0;
62         u_int regs[4];
63         u_int max_cores;
64
65         /* Derived from OpenSSL_ia32_cpuid. */
66
67         OPENSSL_ia32cap_P[0] = cpu_feature & ~(CPUID_B20 | CPUID_IA64);
68         if (cpu_vendor_id == CPU_VENDOR_INTEL) {
69                 OPENSSL_ia32cap_P[0] |= CPUID_IA64;
70                 if ((cpu_id & 0xf00) != 0xf00)
71                         OPENSSL_ia32cap_P[0] |= CPUID_B20;
72         }
73
74         /* Only leave CPUID_HTT on if HTT is present. */
75         if (cpu_vendor_id == CPU_VENDOR_AMD && cpu_exthigh >= 0x80000008) {
76                 max_cores = (cpu_procinfo2 & AMDID_CMP_CORES) + 1;
77                 if (cpu_feature & CPUID_HTT) {
78                         if ((cpu_procinfo & CPUID_HTT_CORES) >> 16 <= max_cores)
79                                 OPENSSL_ia32cap_P[0] &= ~CPUID_HTT;
80                 }
81         } else {
82                 if (cpu_high >= 4) {
83                         cpuid_count(4, 0, regs);
84                         max_cores = (regs[0] >> 26) & 0xfff;
85                 } else
86                         max_cores = -1;
87         }
88         if (max_cores == 0)
89                 OPENSSL_ia32cap_P[0] &= ~CPUID_HTT;
90         else if ((cpu_procinfo & CPUID_HTT_CORES) >> 16 == 0)
91                 OPENSSL_ia32cap_P[0] &= ~CPUID_HTT;
92
93         OPENSSL_ia32cap_P[1] = cpu_feature2 & ~AMDID2_XOP;
94         if (cpu_vendor_id == CPU_VENDOR_AMD)
95                 OPENSSL_ia32cap_P[1] |= amd_feature2 & AMDID2_XOP;
96
97         OPENSSL_ia32cap_P[2] = cpu_stdext_feature;
98         if ((OPENSSL_ia32cap_P[1] & CPUID2_XSAVE) == 0)
99                 OPENSSL_ia32cap_P[2] &= ~(CPUID_STDEXT_AVX512F |
100                     CPUID_STDEXT_AVX512DQ);
101
102         /* Disable AVX512F on Skylake-X. */
103         if ((cpu_id & 0x0fff0ff0) == 0x00050650)
104                 OPENSSL_ia32cap_P[2] &= ~(CPUID_STDEXT_AVX512F);
105
106         if (cpu_feature2 & CPUID2_OSXSAVE)
107                 xcr0 = rxcr(0);
108         else
109                 xcr0 = 0;
110
111         if ((xcr0 & (XFEATURE_AVX512 | XFEATURE_AVX)) !=
112             (XFEATURE_AVX512 | XFEATURE_AVX))
113                 OPENSSL_ia32cap_P[2] &= ~(CPUID_STDEXT_AVX512VL |
114                     CPUID_STDEXT_AVX512BW | CPUID_STDEXT_AVX512IFMA |
115                     CPUID_STDEXT_AVX512F);
116         if ((xcr0 & XFEATURE_AVX) != XFEATURE_AVX) {
117                 OPENSSL_ia32cap_P[1] &= ~(CPUID2_AVX | AMDID2_XOP | CPUID2_FMA);
118                 OPENSSL_ia32cap_P[2] &= ~CPUID_STDEXT_AVX2;
119         }
120
121         if (!AESNI_CAPABLE) {
122                 sc->has_aes = false;
123                 return;
124         }
125         sc->has_aes = true;
126         ossl_cipher_aes_cbc.set_encrypt_key = aesni_set_encrypt_key;
127         ossl_cipher_aes_cbc.set_decrypt_key = aesni_set_decrypt_key;
128 }