[U-Boot] [PATCH v1 2/5] bootcount: Add function wrappers to handle bootcount increment and error checking
Lukasz Majewski
lukma at denx.de
Sat Feb 10 10:20:29 UTC 2018
Those two functions can be used in either SPL or U-boot proper to provide
easy bootcount management.
Signed-off-by: Lukasz Majewski <lukma at denx.de>
---
include/bootcount.h | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)
diff --git a/include/bootcount.h b/include/bootcount.h
index 06fb4d3578..534875a5a5 100644
--- a/include/bootcount.h
+++ b/include/bootcount.h
@@ -38,3 +38,28 @@ static inline u32 raw_bootcount_load(volatile u32 *addr)
return in_be32(addr);
}
#endif
+
+#ifdef CONFIG_SPL_BOOTCOUNT_LIMIT
+static inline bool bootcount_error(void)
+{
+ unsigned long bootcount = bootcount_load();
+ unsigned long bootlimit = env_get_ulong("bootlimit", 10, 0);
+
+ if (bootlimit && (bootcount >= bootlimit)) {
+ printf("Warning: Bootlimit (%lu) exceeded.\n", bootcount);
+ return true;
+ }
+
+ return false;
+}
+
+static inline void bootcount_inc(void)
+{
+ unsigned long bootcount = bootcount_load();
+
+ bootcount_store(++bootcount);
+}
+#else
+static inline bool bootcount_error(void) { return false; }
+static inline void bootcount_inc(void) {}
+#endif /* CONFIG_SPL_BOOTCOUNT_LIMIT */
--
2.11.0
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