diff --git a/firmware/ice40-riscv/e1-tracer/misc.c b/firmware/ice40-riscv/e1-tracer/misc.c
new file mode 100644
index 0000000..6b100bd
--- /dev/null
+++ b/firmware/ice40-riscv/e1-tracer/misc.c
@@ -0,0 +1,35 @@
+/*
+ * misc.c
+ *
+ * Copyright (C) 2019-2020  Sylvain Munaut <tnt@246tNt.com>
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#include <stdbool.h>
+#include <stdint.h>
+
+#include "config.h"
+#include "misc.h"
+
+
+struct misc {
+	uint32_t warmboot;
+	uint32_t _rsvd0[3];;
+	struct {
+		uint16_t tx;
+		uint16_t rx;
+	} e1_tick[2];
+	uint32_t _rsvd1;
+	uint32_t time;
+} __attribute__((packed,aligned(4)));
+
+static volatile struct misc * const misc_regs = (void*)(MISC_BASE);
+
+
+void
+e1_tick_read(uint16_t *ticks)
+{
+	uint32_t v = misc_regs->e1_tick;
+	ticks[0] = (v      ) & 0xffff;
+	ticks[1] = (v >> 16) & 0xffff;
+}