Move all files

1 files changed, 42 insertions, 0 deletions

diff --git a/riscv/picorv32/firmware/stats.c b/riscv/picorv32/firmware/stats.c
new file mode 100644
index 0000000..80e22dd
--- /dev/null
+++ b/riscv/picorv32/firmware/stats.c
@@ -0,0 +1,42 @@
+// This is free and unencumbered software released into the public domain.
+//
+// Anyone is free to copy, modify, publish, use, compile, sell, or
+// distribute this software, either in source code form or as a compiled
+// binary, for any purpose, commercial or non-commercial, and by any
+// means.
+
+#include "firmware.h"
+
+static void stats_print_dec(unsigned int val, int digits, bool zero_pad)
+{
+	char buffer[32];
+	char *p = buffer;
+	while (val || digits > 0) {
+		if (val)
+			*(p++) = '0' + val % 10;
+		else
+			*(p++) = zero_pad ? '0' : ' ';
+		val = val / 10;
+		digits--;
+	}
+	while (p != buffer) {
+		if (p[-1] == ' ' && p[-2] == ' ') p[-1] = '.';
+		print_chr(*(--p));
+	}
+}
+
+void stats(void)
+{
+	unsigned int num_cycles, num_instr;
+	__asm__ volatile ("rdcycle %0; rdinstret %1;" : "=r"(num_cycles), "=r"(num_instr));
+	print_str("Cycle counter ........");
+	stats_print_dec(num_cycles, 8, false);
+	print_str("\nInstruction counter ..");
+	stats_print_dec(num_instr, 8, false);
+	print_str("\nCPI: ");
+	stats_print_dec((num_cycles / num_instr), 0, false);
+	print_str(".");
+	stats_print_dec(((100 * num_cycles) / num_instr) % 100, 2, true);
+	print_str("\n");
+}
+