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0dd0c7fa RH |
1 | /* |
2 | * SPDX-License-Identifier: GPL-2.0-or-later | |
3 | * Host specific cpu indentification for AArch64. | |
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 | |
16 | #endif | |
17 | #ifdef CONFIG_DARWIN | |
18 | # include <sys/sysctl.h> | |
19 | #endif | |
20 | ||
21 | unsigned cpuinfo; | |
22 | ||
23 | #ifdef CONFIG_DARWIN | |
24 | static bool sysctl_for_bool(const char *name) | |
25 | { | |
26 | int val = 0; | |
27 | size_t len = sizeof(val); | |
28 | ||
29 | if (sysctlbyname(name, &val, &len, NULL, 0) == 0) { | |
30 | return val != 0; | |
31 | } | |
32 | ||
33 | /* | |
34 | * We might in the future ask for properties not present in older kernels, | |
35 | * but we're only asking about static properties, all of which should be | |
36 | * 'int'. So we shouln't see ENOMEM (val too small), or any of the other | |
37 | * more exotic errors. | |
38 | */ | |
39 | assert(errno == ENOENT); | |
40 | return false; | |
41 | } | |
42 | #endif | |
43 | ||
44 | /* Called both as constructor and (possibly) via other constructors. */ | |
45 | unsigned __attribute__((constructor)) cpuinfo_init(void) | |
46 | { | |
47 | unsigned info = cpuinfo; | |
48 | ||
49 | if (info) { | |
50 | return info; | |
51 | } | |
52 | ||
53 | info = CPUINFO_ALWAYS; | |
54 | ||
55 | #ifdef CONFIG_LINUX | |
56 | unsigned long hwcap = qemu_getauxval(AT_HWCAP); | |
57 | info |= (hwcap & HWCAP_ATOMICS ? CPUINFO_LSE : 0); | |
58 | info |= (hwcap & HWCAP_USCAT ? CPUINFO_LSE2 : 0); | |
8d97f28e | 59 | info |= (hwcap & HWCAP_AES ? CPUINFO_AES: 0); |
0dd0c7fa RH |
60 | #endif |
61 | #ifdef CONFIG_DARWIN | |
62 | info |= sysctl_for_bool("hw.optional.arm.FEAT_LSE") * CPUINFO_LSE; | |
63 | info |= sysctl_for_bool("hw.optional.arm.FEAT_LSE2") * CPUINFO_LSE2; | |
8d97f28e | 64 | info |= sysctl_for_bool("hw.optional.arm.FEAT_AES") * CPUINFO_AES; |
0dd0c7fa RH |
65 | #endif |
66 | ||
67 | cpuinfo = info; | |
68 | return info; | |
69 | } |