fusee-primary: reboot to self, instead of to RCM

fusee/fusee-primary/Makefile

@@ -7,6 +7,8 @@ $(error "Please set DEVKITARM in your environment. export DEVKITARM=<path to>dev
 endif
 
 TOPDIR ?= $(CURDIR)
+
+AMS		:= $(TOPDIR)/../../
 include $(DEVKITARM)/base_rules
 
 AMSBRANCH := $(shell git symbolic-ref --short HEAD)
@@ -74,14 +76,15 @@ export OUTPUT	:=	$(CURDIR)/$(TARGET)
 export TOPDIR	:=	$(CURDIR)
 
 export VPATH	:=	$(foreach dir,$(SOURCES),$(CURDIR)/$(dir)) \
-			$(foreach dir,$(DATA),$(CURDIR)/$(dir))
+			$(foreach dir,$(DATA),$(CURDIR)/$(dir)) \
+			$(AMS)/exosphere/rebootstub
 
 export DEPSDIR	:=	$(CURDIR)/$(BUILD)
 
 CFILES		:=	$(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.c)))
 CPPFILES	:=	$(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.cpp)))
 SFILES		:=	$(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.s)))
-BINFILES	:=	$(foreach dir,$(DATA),$(notdir $(wildcard $(dir)/*.*)))
+BINFILES	:=	$(foreach dir,$(DATA),$(notdir $(wildcard $(dir)/*.*))) rebootstub.bin
 
 #---------------------------------------------------------------------------------
 # use CXX for linking C++ projects, CC for standard C
@@ -108,10 +111,13 @@ export INCLUDE	:=	$(foreach dir,$(INCLUDES),-I$(CURDIR)/$(dir)) \
 
 export LIBPATHS	:=	$(foreach dir,$(LIBDIRS),-L$(dir)/lib)
 
-.PHONY: $(BUILD) clean all
+.PHONY: $(BUILD) clean all check_rebootstub
 
 #---------------------------------------------------------------------------------
-all: $(BUILD)
+all: check_rebootstub $(BUILD)
+
+check_rebootstub:
+	@$(MAKE) -C $(AMS)/exosphere/rebootstub all
 
 $(BUILD):
 	@[ -d $@ ] || mkdir -p $@
@@ -150,7 +156,7 @@ $(OFILES_SRC)	: $(HFILES_BIN)
 #---------------------------------------------------------------------------------
 # you need a rule like this for each extension you use as binary data
 #---------------------------------------------------------------------------------
-%.bin.o	:	%.bin
+%.bin.o	%_bin.h:	%.bin
 #---------------------------------------------------------------------------------
 	@echo $(notdir $<)
 	@$(bin2o)

fusee/fusee-primary/src/pmc.h

@@ -61,6 +61,11 @@
 #define APBDEV_PMC_SCRATCH190_0 MAKE_PMC_REG(0x818)
 #define APBDEV_PMC_SCRATCH200_0 MAKE_PMC_REG(0x840)
 
+#define APBDEV_PMC_SCRATCH45_0 MAKE_PMC_REG(0x234)
+#define APBDEV_PMC_SCRATCH46_0 MAKE_PMC_REG(0x238)
+#define APBDEV_PMC_SCRATCH33_0 MAKE_PMC_REG(0x120)
+#define APBDEV_PMC_SCRATCH40_0 MAKE_PMC_REG(0x13C)
+
 typedef struct {
     uint32_t cntrl;
     uint32_t sec_disable;

fusee/fusee-primary/src/utils.c

@@ -29,6 +29,12 @@
 
 #include <inttypes.h>
 
+#define u8 uint8_t
+#define u32 uint32_t
+#include "rebootstub_bin.h"
+#undef u8
+#undef u32
+
 void wait(uint32_t microseconds) {
     uint32_t old_time = TIMERUS_CNTR_1US_0;
     while (TIMERUS_CNTR_1US_0 - old_time <= microseconds) {
@@ -59,12 +65,29 @@ __attribute__((noreturn)) void pmc_reboot(uint32_t scratch0) {
     }
 }
 
+__attribute__((noreturn)) void reboot_to_self(void) {
+    /* Patch SDRAM init to perform an SVC immediately after second write */
+    APBDEV_PMC_SCRATCH45_0 = 0x2E38DFFF;
+    APBDEV_PMC_SCRATCH46_0 = 0x6001DC28;
+    /* Set SVC handler to jump to reboot stub in IRAM. */
+    APBDEV_PMC_SCRATCH33_0 = 0x4003F000;
+    APBDEV_PMC_SCRATCH40_0 = 0x6000F208;
+    
+    /* Copy reboot stub into IRAM high. */
+    for (size_t i = 0; i < rebootstub_bin_size; i += sizeof(uint32_t)) {
+        write32le((void *)0x4003F000, i, read32le(rebootstub_bin, i));
+    }
+    
+    /* Trigger warm reboot. */
+    pmc_reboot(1 << 0);
+}
+
 __attribute__((noreturn)) void wait_for_button_and_reboot(void) {
     uint32_t button;
     while (true) {
         button = btn_read();
         if (button & BTN_POWER) {
-            pmc_reboot(1 << 1);
+            reboot_to_self();
         }
     }
 }

fusee/fusee-primary/src/utils.h

@@ -121,6 +121,7 @@ void hexdump(const void* data, size_t size, uintptr_t addrbase);
 
 __attribute__((noreturn)) void watchdog_reboot(void);
 __attribute__((noreturn)) void pmc_reboot(uint32_t scratch0);
+__attribute__((noreturn)) void reboot_to_self(void);
 __attribute__((noreturn)) void wait_for_button_and_reboot(void);
 
 __attribute__((noreturn)) void generic_panic(void);