buflib: add a common dummy callbacks struct & use it

There are various allocations that can't be moved or shrunk.
Provide a global callback struct for this use case instead of
making each caller declare its own dummy struct.

Also fixed ROLO and x1000 installer code which incorrectly
used movable allocations.

Change-Id: I00088396b9826e02e69a4a33477fe1a7816374f1

1 files changed, 6 insertions, 0 deletions

diff --git a/firmware/include/buflib.h b/firmware/include/buflib.h
index 7f534c6ce0..e805ebbf1b 100644
--- a/firmware/include/buflib.h
+++ b/firmware/include/buflib.h
@@ -129,6 +129,12 @@ struct buflib_callbacks {
     void (*sync_callback)(int handle, bool sync_on);
 };
 
+/** A set of all NULL callbacks for use with allocations that need to stay
+ * locked in RAM and not moved or shrunk. These type of allocations should
+ * be avoided as much as possible to avoid memory fragmentation but it can
+ * suitable for short-lived allocations. */
+extern struct buflib_callbacks buflib_ops_locked;
+
 #define BUFLIB_SHRINK_SIZE_MASK (~BUFLIB_SHRINK_POS_MASK)
 #define BUFLIB_SHRINK_POS_FRONT (1u<<31)
 #define BUFLIB_SHRINK_POS_BACK  (1u<<30)