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/*
* SPDX-License-Identifier: GPL-2.0-or-later
* Host specific cpu identification for AArch64.
*/
#include "qemu/osdep.h"
#include "host/cpuinfo.h"
#ifdef CONFIG_LINUX
# ifdef CONFIG_GETAUXVAL
# include <sys/auxv.h>
# else
# include <asm/hwcap.h>
# include "elf.h"
# endif
# ifndef HWCAP2_BTI
# define HWCAP2_BTI 0 /* added in glibc 2.32 */
# endif
#endif
#ifdef CONFIG_ELF_AUX_INFO
#include <sys/auxv.h>
#endif
#ifdef CONFIG_DARWIN
# include <sys/sysctl.h>
#endif
#if defined(__OpenBSD__) && !defined(CONFIG_ELF_AUX_INFO)
# include <machine/armreg.h>
# include <machine/cpu.h>
# include <sys/types.h>
# include <sys/sysctl.h>
#endif
unsigned cpuinfo;
#ifdef CONFIG_DARWIN
static bool sysctl_for_bool(const char *name)
{
int val = 0;
size_t len = sizeof(val);
if (sysctlbyname(name, &val, &len, NULL, 0) == 0) {
return val != 0;
}
/*
* We might in the future ask for properties not present in older kernels,
* but we're only asking about static properties, all of which should be
* 'int'. So we shouldn't see ENOMEM (val too small), or any of the other
* more exotic errors.
*/
assert(errno == ENOENT);
return false;
}
#endif
/* Called both as constructor and (possibly) via other constructors. */
unsigned __attribute__((constructor)) cpuinfo_init(void)
{
unsigned info = cpuinfo;
if (info) {
return info;
}
info = CPUINFO_ALWAYS;
#if defined(CONFIG_LINUX) || defined(CONFIG_ELF_AUX_INFO)
unsigned long hwcap = qemu_getauxval(AT_HWCAP);
info |= (hwcap & HWCAP_ATOMICS ? CPUINFO_LSE : 0);
info |= (hwcap & HWCAP_USCAT ? CPUINFO_LSE2 : 0);
info |= (hwcap & HWCAP_AES ? CPUINFO_AES : 0);
info |= (hwcap & HWCAP_PMULL ? CPUINFO_PMULL : 0);
unsigned long hwcap2 = qemu_getauxval(AT_HWCAP2);
info |= (hwcap2 & HWCAP2_BTI ? CPUINFO_BTI : 0);
#endif
#ifdef CONFIG_DARWIN
info |= sysctl_for_bool("hw.optional.arm.FEAT_LSE") * CPUINFO_LSE;
info |= sysctl_for_bool("hw.optional.arm.FEAT_LSE2") * CPUINFO_LSE2;
info |= sysctl_for_bool("hw.optional.arm.FEAT_AES") * CPUINFO_AES;
info |= sysctl_for_bool("hw.optional.arm.FEAT_PMULL") * CPUINFO_PMULL;
info |= sysctl_for_bool("hw.optional.arm.FEAT_BTI") * CPUINFO_BTI;
#endif
#if defined(__OpenBSD__) && !defined(CONFIG_ELF_AUX_INFO)
int mib[2];
uint64_t isar0;
uint64_t pfr1;
size_t len;
mib[0] = CTL_MACHDEP;
mib[1] = CPU_ID_AA64ISAR0;
len = sizeof(isar0);
if (sysctl(mib, 2, &isar0, &len, NULL, 0) != -1) {
if (ID_AA64ISAR0_ATOMIC(isar0) >= ID_AA64ISAR0_ATOMIC_IMPL) {
info |= CPUINFO_LSE;
}
if (ID_AA64ISAR0_AES(isar0) >= ID_AA64ISAR0_AES_BASE) {
info |= CPUINFO_AES;
}
if (ID_AA64ISAR0_AES(isar0) >= ID_AA64ISAR0_AES_PMULL) {
info |= CPUINFO_PMULL;
}
}
mib[0] = CTL_MACHDEP;
mib[1] = CPU_ID_AA64PFR1;
len = sizeof(pfr1);
if (sysctl(mib, 2, &pfr1, &len, NULL, 0) != -1) {
if (ID_AA64PFR1_BT(pfr1) >= ID_AA64PFR1_BT_IMPL) {
info |= CPUINFO_BTI;
}
}
#endif
cpuinfo = info;
return info;
}
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