1 files changed, 49 insertions, 0 deletions
diff --git a/src/riscv/cpu.c b/src/riscv/cpu.c
new file mode 100644
index 0000000..1637710
--- /dev/null
+++ b/src/riscv/cpu.c
@@ -0,0 +1,49 @@
+/*
+ * Copyright © 2022, VideoLAN and dav1d authors
+ * Copyright © 2022, Nathan Egge
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+
+#include "common/attributes.h"
+
+#include "src/riscv/cpu.h"
+
+#if defined(HAVE_GETAUXVAL)
+#include <sys/auxv.h>
+
+#define HWCAP_RVV (1 << ('v' - 'a'))
+
+#endif
+
+COLD unsigned dav1d_get_cpu_flags_riscv(void) {
+    unsigned flags = 0;
+#if defined(HAVE_GETAUXVAL)
+    unsigned long hw_cap = getauxval(AT_HWCAP);
+    flags |= (hw_cap & HWCAP_RVV) ? DAV1D_RISCV_CPU_FLAG_V : 0;
+#endif
+
+    return flags;
+}