| 1 | /* |
| 2 | * SPDX-License-Identifier: GPL-2.0-or-later |
| 3 | * Host specific cpu identification 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 | # ifndef HWCAP2_BTI |
| 17 | # define HWCAP2_BTI 0 /* added in glibc 2.32 */ |
| 18 | # endif |
| 19 | # ifndef HWCAP2_CSSC |
| 20 | # define HWCAP2_CSSC 0 /* added in glibc 2.38 */ |
| 21 | # endif |
| 22 | #endif |
| 23 | #ifdef CONFIG_ELF_AUX_INFO |
| 24 | #include <sys/auxv.h> |
| 25 | #endif |
| 26 | #ifdef CONFIG_DARWIN |
| 27 | # include <sys/sysctl.h> |
| 28 | #endif |
| 29 | #if defined(__OpenBSD__) && !defined(CONFIG_ELF_AUX_INFO) |
| 30 | # include <machine/armreg.h> |
| 31 | # include <machine/cpu.h> |
| 32 | # include <sys/sysctl.h> |
| 33 | #endif |
| 34 | |
| 35 | unsigned cpuinfo; |
| 36 | |
| 37 | #ifdef CONFIG_DARWIN |
| 38 | static bool sysctl_for_bool(const char *name) |
| 39 | { |
| 40 | int val = 0; |
| 41 | size_t len = sizeof(val); |
| 42 | |
| 43 | if (sysctlbyname(name, &val, &len, NULL, 0) == 0) { |
| 44 | return val != 0; |
| 45 | } |
| 46 | |
| 47 | /* |
| 48 | * We might in the future ask for properties not present in older kernels, |
| 49 | * but we're only asking about static properties, all of which should be |
| 50 | * 'int'. So we shouldn't see ENOMEM (val too small), or any of the other |
| 51 | * more exotic errors. |
| 52 | */ |
| 53 | assert(errno == ENOENT); |
| 54 | return false; |
| 55 | } |
| 56 | #endif |
| 57 | |
| 58 | /* Called both as constructor and (possibly) via other constructors. */ |
| 59 | unsigned __attribute__((constructor)) cpuinfo_init(void) |
| 60 | { |
| 61 | unsigned info = cpuinfo; |
| 62 | |
| 63 | if (info) { |
| 64 | return info; |
| 65 | } |
| 66 | |
| 67 | info = CPUINFO_ALWAYS; |
| 68 | |
| 69 | #if defined(CONFIG_LINUX) || defined(CONFIG_ELF_AUX_INFO) |
| 70 | unsigned long hwcap = qemu_getauxval(AT_HWCAP); |
| 71 | info |= (hwcap & HWCAP_ATOMICS ? CPUINFO_LSE : 0); |
| 72 | info |= (hwcap & HWCAP_USCAT ? CPUINFO_LSE2 : 0); |
| 73 | info |= (hwcap & HWCAP_AES ? CPUINFO_AES : 0); |
| 74 | info |= (hwcap & HWCAP_PMULL ? CPUINFO_PMULL : 0); |
| 75 | |
| 76 | unsigned long hwcap2 = qemu_getauxval(AT_HWCAP2); |
| 77 | info |= (hwcap2 & HWCAP2_BTI ? CPUINFO_BTI : 0); |
| 78 | info |= (hwcap2 & HWCAP2_CSSC ? CPUINFO_CSSC : 0); |
| 79 | #endif |
| 80 | #ifdef CONFIG_DARWIN |
| 81 | info |= sysctl_for_bool("hw.optional.arm.FEAT_LSE") * CPUINFO_LSE; |
| 82 | info |= sysctl_for_bool("hw.optional.arm.FEAT_LSE2") * CPUINFO_LSE2; |
| 83 | info |= sysctl_for_bool("hw.optional.arm.FEAT_AES") * CPUINFO_AES; |
| 84 | info |= sysctl_for_bool("hw.optional.arm.FEAT_PMULL") * CPUINFO_PMULL; |
| 85 | info |= sysctl_for_bool("hw.optional.arm.FEAT_BTI") * CPUINFO_BTI; |
| 86 | info |= sysctl_for_bool("hw.optional.arm.FEAT_CSSC") * CPUINFO_CSSC; |
| 87 | #endif |
| 88 | #if defined(__OpenBSD__) && !defined(CONFIG_ELF_AUX_INFO) |
| 89 | int mib[2]; |
| 90 | uint64_t isar0; |
| 91 | uint64_t pfr1; |
| 92 | size_t len; |
| 93 | |
| 94 | mib[0] = CTL_MACHDEP; |
| 95 | mib[1] = CPU_ID_AA64ISAR0; |
| 96 | len = sizeof(isar0); |
| 97 | if (sysctl(mib, 2, &isar0, &len, NULL, 0) != -1) { |
| 98 | if (ID_AA64ISAR0_ATOMIC(isar0) >= ID_AA64ISAR0_ATOMIC_IMPL) { |
| 99 | info |= CPUINFO_LSE; |
| 100 | } |
| 101 | if (ID_AA64ISAR0_AES(isar0) >= ID_AA64ISAR0_AES_BASE) { |
| 102 | info |= CPUINFO_AES; |
| 103 | } |
| 104 | if (ID_AA64ISAR0_AES(isar0) >= ID_AA64ISAR0_AES_PMULL) { |
| 105 | info |= CPUINFO_PMULL; |
| 106 | } |
| 107 | } |
| 108 | |
| 109 | mib[0] = CTL_MACHDEP; |
| 110 | mib[1] = CPU_ID_AA64PFR1; |
| 111 | len = sizeof(pfr1); |
| 112 | if (sysctl(mib, 2, &pfr1, &len, NULL, 0) != -1) { |
| 113 | if (ID_AA64PFR1_BT(pfr1) >= ID_AA64PFR1_BT_IMPL) { |
| 114 | info |= CPUINFO_BTI; |
| 115 | } |
| 116 | } |
| 117 | #endif |
| 118 | |
| 119 | cpuinfo = info; |
| 120 | return info; |
| 121 | } |