util: Add cpuinfo for loongarch64

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Jiajie Chen <c@jia.je>
Message-Id: <20230916220151.526140-4-richard.henderson@linaro.org>

1 files changed, 35 insertions, 0 deletions

diff --git a/util/cpuinfo-loongarch.c b/util/cpuinfo-loongarch.c
new file mode 100644
index 0000000..08b6d74
--- /dev/null
+++ b/util/cpuinfo-loongarch.c
@@ -0,0 +1,35 @@
+/*
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ * Host specific cpu identification for LoongArch.
+ */
+
+#include "qemu/osdep.h"
+#include "host/cpuinfo.h"
+
+#ifdef CONFIG_GETAUXVAL
+# include <sys/auxv.h>
+#else
+# include "elf.h"
+#endif
+#include <asm/hwcap.h>
+
+unsigned cpuinfo;
+
+/* Called both as constructor and (possibly) via other constructors. */
+unsigned __attribute__((constructor)) cpuinfo_init(void)
+{
+    unsigned info = cpuinfo;
+    unsigned long hwcap;
+
+    if (info) {
+        return info;
+    }
+
+    hwcap = qemu_getauxval(AT_HWCAP);
+
+    info = CPUINFO_ALWAYS;
+    info |= (hwcap & HWCAP_LOONGARCH_LSX ? CPUINFO_LSX : 0);
+
+    cpuinfo = info;
+    return info;
+}