From 87fcd061a86dd5c050f17d2154bc9ef2eca4d71d Mon Sep 17 00:00:00 2001
From: Kaspar Schleiser <kaspar@schleiser.de>
Date: Thu, 26 Sep 2019 13:57:17 +0200
Subject: [PATCH] sys/riotboot: provide riotboot_slot_offset()

---
 sys/include/riotboot/slot.h | 5 +++++
 sys/riotboot/slot.c         | 5 +++++
 2 files changed, 10 insertions(+)

diff --git a/sys/include/riotboot/slot.h b/sys/include/riotboot/slot.h
index f1cbbba7b4..93a38b16f0 100644
--- a/sys/include/riotboot/slot.h
+++ b/sys/include/riotboot/slot.h
@@ -93,6 +93,11 @@ static inline void riotboot_slot_print_hdr(unsigned slot)
     riotboot_hdr_print(riotboot_slot_get_hdr(slot));
 }
 
+/**
+ * @brief Get the offset (in flash, in bytes) for a given slot.
+ */
+size_t riotboot_slot_offset(unsigned slot);
+
 /**
  * @brief  Dump the addresses of all configured slots
  *
diff --git a/sys/riotboot/slot.c b/sys/riotboot/slot.c
index fa4b79738c..472b02fc5b 100644
--- a/sys/riotboot/slot.c
+++ b/sys/riotboot/slot.c
@@ -93,3 +93,8 @@ const riotboot_hdr_t *riotboot_slot_get_hdr(unsigned slot)
 
     return riotboot_slots[slot];
 }
+
+size_t riotboot_slot_offset(unsigned slot)
+{
+    return (size_t)riotboot_slot_get_hdr(slot) - CPU_FLASH_BASE;
+}