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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 RH |
19 | #endif |
20 | #ifdef CONFIG_DARWIN | |
21 | # include <sys/sysctl.h> | |
22 | #endif | |
23 | ||
24 | unsigned cpuinfo; | |
25 | ||
26 | #ifdef CONFIG_DARWIN | |
27 | static bool sysctl_for_bool(const char *name) | |
28 | { | |
29 | int val = 0; | |
30 | size_t len = sizeof(val); | |
31 | ||
32 | if (sysctlbyname(name, &val, &len, NULL, 0) == 0) { | |
33 | return val != 0; | |
34 | } | |
35 | ||
36 | /* | |
37 | * We might in the future ask for properties not present in older kernels, | |
38 | * but we're only asking about static properties, all of which should be | |
d02d06f8 | 39 | * 'int'. So we shouldn't see ENOMEM (val too small), or any of the other |
0dd0c7fa RH |
40 | * more exotic errors. |
41 | */ | |
42 | assert(errno == ENOENT); | |
43 | return false; | |
44 | } | |
45 | #endif | |
46 | ||
47 | /* Called both as constructor and (possibly) via other constructors. */ | |
48 | unsigned __attribute__((constructor)) cpuinfo_init(void) | |
49 | { | |
50 | unsigned info = cpuinfo; | |
51 | ||
52 | if (info) { | |
53 | return info; | |
54 | } | |
55 | ||
56 | info = CPUINFO_ALWAYS; | |
57 | ||
58 | #ifdef CONFIG_LINUX | |
59 | unsigned long hwcap = qemu_getauxval(AT_HWCAP); | |
60 | info |= (hwcap & HWCAP_ATOMICS ? CPUINFO_LSE : 0); | |
61 | info |= (hwcap & HWCAP_USCAT ? CPUINFO_LSE2 : 0); | |
055c9901 RH |
62 | info |= (hwcap & HWCAP_AES ? CPUINFO_AES : 0); |
63 | info |= (hwcap & HWCAP_PMULL ? CPUINFO_PMULL : 0); | |
095859e5 RH |
64 | |
65 | unsigned long hwcap2 = qemu_getauxval(AT_HWCAP2); | |
66 | info |= (hwcap2 & HWCAP2_BTI ? CPUINFO_BTI : 0); | |
0dd0c7fa RH |
67 | #endif |
68 | #ifdef CONFIG_DARWIN | |
69 | info |= sysctl_for_bool("hw.optional.arm.FEAT_LSE") * CPUINFO_LSE; | |
70 | info |= sysctl_for_bool("hw.optional.arm.FEAT_LSE2") * CPUINFO_LSE2; | |
8d97f28e | 71 | info |= sysctl_for_bool("hw.optional.arm.FEAT_AES") * CPUINFO_AES; |
055c9901 | 72 | info |= sysctl_for_bool("hw.optional.arm.FEAT_PMULL") * CPUINFO_PMULL; |
095859e5 | 73 | info |= sysctl_for_bool("hw.optional.arm.FEAT_BTI") * CPUINFO_BTI; |
0dd0c7fa RH |
74 | #endif |
75 | ||
76 | cpuinfo = info; | |
77 | return info; | |
78 | } |