[ot] hw/core: loader.c: make generic loader image loadable at will

Image file loaded with "-device loader,file=..." are copied back to their
destination device when the generic QEMU reset feature is invoked.

As OpenTitan device use a specialized reset scheme, we may need to copy the so-called
"ROM" images (as QEMU non-modifiable image, not related to OT ROM controller images)
at will.

Add a public API to trigger this image-to-device copy since the default API is private.

Signed-off-by: Emmanuel Blot <[email protected]>

Author: rivos-eblot

hw/core/loader.c

@@ -1420,6 +1420,11 @@ int rom_check_and_register_reset(void)
     return 0;
 }
 
+void rom_load(void)
+{
+    rom_reset(NULL);
+}
+
 void rom_set_fw(FWCfgState *f)
 {
     fw_cfg = f;

hw/riscv/ot_darjeeling.c

@@ -29,6 +29,7 @@
 #include "hw/intc/sifive_plic.h"
 #include "hw/jtag/tap_ctrl.h"
 #include "hw/jtag/tap_ctrl_rbb.h"
+#include "hw/loader.h"
 #include "hw/misc/pulp_rv_dm.h"
 #include "hw/misc/unimp.h"
 #include "hw/opentitan/ot_address_space.h"
@@ -1716,6 +1717,8 @@ static void ot_dj_soc_reset_exit(Object *obj, ResetType type)
         c->parent_phases.exit(obj, type);
     }
 
+    rom_load();
+
     /* Kick off ROM checks and boot */
     object_property_set_bool(OBJECT(s->devices[OT_DJ_SOC_DEV_ROM_CTRL0]),
                              "load", true, &error_fatal);

include/hw/loader.h

@@ -389,4 +389,9 @@ typedef struct RomGap {
  */
 RomGap rom_find_largest_gap_between(hwaddr base, size_t size);
 
+/**
+ * rom_load: Load all registered ROMs
+ */
+void rom_load(void);
+
 #endif