Import QEMU upstream snapshot d2e570c

Upstream: https://gitlab.com/qemu-project/qemu.git

Upstream-Commit: d2e570cc0f97b936902a5b1b86b73c0f5998b475

util/cpuinfo-aarch64.c

@@ -0,0 +1,121 @@
+/*
+ * 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
+# ifndef HWCAP2_CSSC
+#  define HWCAP2_CSSC 0  /* added in glibc 2.38 */
+# 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/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);
+    info |= (hwcap2 & HWCAP2_CSSC ? CPUINFO_CSSC : 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;
+    info |= sysctl_for_bool("hw.optional.arm.FEAT_CSSC") * CPUINFO_CSSC;
+#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;
+}