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0dd0c7fa RH |
1 | /* |
2 | * SPDX-License-Identifier: GPL-2.0-or-later | |
d02d06f8 | 3 | * Host specific cpu identification for AArch64. |
0dd0c7fa RH |
4 | */ |
5 | ||
6 | #include "qemu/osdep.h" | |
7 | #include "host/cpuinfo.h" | |
8 | ||
9 | #ifdef CONFIG_LINUX | |
10 | # ifdef CONFIG_GETAUXVAL | |
11 | # include <sys/auxv.h> | |
12 | # else | |
13 | # include <asm/hwcap.h> | |
14 | # include "elf.h" | |
15 | # endif | |
095859e5 RH |
16 | # ifndef HWCAP2_BTI |
17 | # define HWCAP2_BTI 0 /* added in glibc 2.32 */ | |
18 | # endif | |
0dd0c7fa | 19 | #endif |
27fca0a0 BS |
20 | #ifdef CONFIG_ELF_AUX_INFO |
21 | #include <sys/auxv.h> | |
22 | #endif | |
0dd0c7fa RH |
23 | #ifdef CONFIG_DARWIN |
24 | # include <sys/sysctl.h> | |
25 | #endif | |
27fca0a0 | 26 | #if defined(__OpenBSD__) && !defined(CONFIG_ELF_AUX_INFO) |
ab089908 BS |
27 | # include <machine/armreg.h> |
28 | # include <machine/cpu.h> | |
29 | # include <sys/types.h> | |
30 | # include <sys/sysctl.h> | |
31 | #endif | |
0dd0c7fa RH |
32 | |
33 | unsigned cpuinfo; | |
34 | ||
35 | #ifdef CONFIG_DARWIN | |
36 | static bool sysctl_for_bool(const char *name) | |
37 | { | |
38 | int val = 0; | |
39 | size_t len = sizeof(val); | |
40 | ||
41 | if (sysctlbyname(name, &val, &len, NULL, 0) == 0) { | |
42 | return val != 0; | |
43 | } | |
44 | ||
45 | /* | |
46 | * We might in the future ask for properties not present in older kernels, | |
47 | * but we're only asking about static properties, all of which should be | |
d02d06f8 | 48 | * 'int'. So we shouldn't see ENOMEM (val too small), or any of the other |
0dd0c7fa RH |
49 | * more exotic errors. |
50 | */ | |
51 | assert(errno == ENOENT); | |
52 | return false; | |
53 | } | |
54 | #endif | |
55 | ||
56 | /* Called both as constructor and (possibly) via other constructors. */ | |
57 | unsigned __attribute__((constructor)) cpuinfo_init(void) | |
58 | { | |
59 | unsigned info = cpuinfo; | |
60 | ||
61 | if (info) { | |
62 | return info; | |
63 | } | |
64 | ||
65 | info = CPUINFO_ALWAYS; | |
66 | ||
27fca0a0 | 67 | #if defined(CONFIG_LINUX) || defined(CONFIG_ELF_AUX_INFO) |
0dd0c7fa RH |
68 | unsigned long hwcap = qemu_getauxval(AT_HWCAP); |
69 | info |= (hwcap & HWCAP_ATOMICS ? CPUINFO_LSE : 0); | |
70 | info |= (hwcap & HWCAP_USCAT ? CPUINFO_LSE2 : 0); | |
055c9901 RH |
71 | info |= (hwcap & HWCAP_AES ? CPUINFO_AES : 0); |
72 | info |= (hwcap & HWCAP_PMULL ? CPUINFO_PMULL : 0); | |
095859e5 RH |
73 | |
74 | unsigned long hwcap2 = qemu_getauxval(AT_HWCAP2); | |
75 | info |= (hwcap2 & HWCAP2_BTI ? CPUINFO_BTI : 0); | |
0dd0c7fa RH |
76 | #endif |
77 | #ifdef CONFIG_DARWIN | |
78 | info |= sysctl_for_bool("hw.optional.arm.FEAT_LSE") * CPUINFO_LSE; | |
79 | info |= sysctl_for_bool("hw.optional.arm.FEAT_LSE2") * CPUINFO_LSE2; | |
8d97f28e | 80 | info |= sysctl_for_bool("hw.optional.arm.FEAT_AES") * CPUINFO_AES; |
055c9901 | 81 | info |= sysctl_for_bool("hw.optional.arm.FEAT_PMULL") * CPUINFO_PMULL; |
095859e5 | 82 | info |= sysctl_for_bool("hw.optional.arm.FEAT_BTI") * CPUINFO_BTI; |
0dd0c7fa | 83 | #endif |
27fca0a0 | 84 | #if defined(__OpenBSD__) && !defined(CONFIG_ELF_AUX_INFO) |
ab089908 BS |
85 | int mib[2]; |
86 | uint64_t isar0; | |
87 | uint64_t pfr1; | |
88 | size_t len; | |
89 | ||
90 | mib[0] = CTL_MACHDEP; | |
91 | mib[1] = CPU_ID_AA64ISAR0; | |
92 | len = sizeof(isar0); | |
93 | if (sysctl(mib, 2, &isar0, &len, NULL, 0) != -1) { | |
94 | if (ID_AA64ISAR0_ATOMIC(isar0) >= ID_AA64ISAR0_ATOMIC_IMPL) { | |
95 | info |= CPUINFO_LSE; | |
96 | } | |
97 | if (ID_AA64ISAR0_AES(isar0) >= ID_AA64ISAR0_AES_BASE) { | |
98 | info |= CPUINFO_AES; | |
99 | } | |
100 | if (ID_AA64ISAR0_AES(isar0) >= ID_AA64ISAR0_AES_PMULL) { | |
101 | info |= CPUINFO_PMULL; | |
102 | } | |
103 | } | |
104 | ||
105 | mib[0] = CTL_MACHDEP; | |
106 | mib[1] = CPU_ID_AA64PFR1; | |
107 | len = sizeof(pfr1); | |
108 | if (sysctl(mib, 2, &pfr1, &len, NULL, 0) != -1) { | |
109 | if (ID_AA64PFR1_BT(pfr1) >= ID_AA64PFR1_BT_IMPL) { | |
110 | info |= CPUINFO_BTI; | |
111 | } | |
112 | } | |
113 | #endif | |
0dd0c7fa RH |
114 | |
115 | cpuinfo = info; | |
116 | return info; | |
117 | } |