Add screeninit to FIRM payload

Makefile

@@ -28,7 +28,7 @@ INCLUDES	:=	source source/common source/font source/filesys source/crypto source
 #---------------------------------------------------------------------------------
 # options for code generation
 #---------------------------------------------------------------------------------
-ARCH	:=	-mthumb -mthumb-interwork -flto
+ARCH	:=	-marm -mthumb-interwork -flto
 
 CFLAGS	:=	-g -Wall -Wextra -Wpedantic -Wcast-align -Wno-main -O2\
 			-march=armv5te -mtune=arm946e-s -fomit-frame-pointer -ffast-math -std=gnu11\
@@ -120,7 +120,7 @@ export INCLUDE	:=	$(foreach dir,$(INCLUDES),-I$(CURDIR)/$(dir)) \
 
 export LIBPATHS	:=	$(foreach dir,$(LIBDIRS),-L$(dir)/lib)
 
-.PHONY: common clean all gateway firm binary cakehax cakerop brahma release
+.PHONY: common clean all gateway firm binary cakehax cakerop brahma screeninit release
 
 #---------------------------------------------------------------------------------
 all: firm
@@ -132,11 +132,14 @@ common:
 submodules:
 	@-git submodule update --init --recursive
 
+screeninit:
+	@$(MAKE) dir_out=$(OUTPUT_D) -C screeninit
+
 binary: common
 	@$(MAKE) --no-print-directory -C $(BUILD) -f $(CURDIR)/Makefile
 
-firm: binary
-	@firmtool build $(OUTPUT).firm -n 0x23F00000 -e 0 -D $(OUTPUT).elf -A 0x23F00000 -C NDMA -i
+firm: binary screeninit
+	firmtool build $(OUTPUT).firm -D $(OUTPUT).elf $(OUTPUT_D)/screeninit.elf -C NDMA XDMA
 
 gateway: binary
 	@cp resources/LauncherTemplate.dat $(OUTPUT_D)/Launcher.dat
@@ -184,6 +187,7 @@ clean:
 	@-$(MAKE) clean --no-print-directory -C CakeHax
 	@-$(MAKE) clean --no-print-directory -C CakesROP
 	@-$(MAKE) clean --no-print-directory -C BrahmaLoader
+	@-$(MAKE) clean --no-print-directory -C screeninit
 	@rm -fr $(BUILD) $(OUTPUT_D) $(RELEASE)
 
 

screeninit/Makefile

@@ -0,0 +1,42 @@
+rwildcard = $(foreach d, $(wildcard $1*), $(filter $(subst *, %, $2), $d) $(call rwildcard, $d/, $2))
+
+ifeq ($(strip $(DEVKITARM)),)
+$(error "Please set DEVKITARM in your environment. export DEVKITARM=<path to>devkitARM")
+endif
+
+include $(DEVKITARM)/base_tools
+
+name := $(shell basename $(CURDIR))
+
+dir_source := source
+dir_build := build
+dir_out := ../$(dir_build)
+
+ASFLAGS := -mcpu=mpcore -mfloat-abi=hard
+CFLAGS  := -Wall -Wextra -MMD -MP -mthumb -mthumb-interwork $(ASFLAGS) -fno-builtin -std=c11 -Wno-main -O2 -flto -ffast-math
+LDFLAGS := -nostdlib
+
+objects = $(patsubst $(dir_source)/%.s, $(dir_build)/%.o, \
+          $(patsubst $(dir_source)/%.c, $(dir_build)/%.o, \
+          $(call rwildcard, $(dir_source), *.s *.c)))
+
+.PHONY: all
+all: $(dir_out)/$(name).bin
+
+.PHONY: clean
+clean:
+	@rm -rf $(dir_build)
+
+$(dir_out)/$(name).bin: $(dir_out)/$(name).elf
+	$(OBJCOPY) -S -O binary $< $@
+
+$(dir_out)/$(name).elf: $(objects)
+	$(LINK.o) -T linker.ld $(OUTPUT_OPTION) $^
+
+$(dir_build)/%.o: $(dir_source)/%.c
+	@mkdir -p "$(@D)"
+	$(COMPILE.c) $(OUTPUT_OPTION) $<
+
+$(dir_build)/%.o: $(dir_source)/%.s
+	@mkdir -p "$(@D)"
+	$(COMPILE.s) $(OUTPUT_OPTION) $<

screeninit/build/main.d

@@ -0,0 +1,3 @@
+build/main.o: source/main.c source/types.h
+
+source/types.h:

screeninit/linker.ld

@@ -0,0 +1,16 @@
+OUTPUT_FORMAT("elf32-littlearm", "elf32-bigarm", "elf32-littlearm")
+OUTPUT_ARCH(arm)
+
+ENTRY(__boot)
+SECTIONS
+{
+    . = 0x1FF80000;
+
+    .text   : ALIGN(4) { *(.text.start) *(.text*); . = ALIGN(4); }
+    .rodata : ALIGN(4) { *(.rodata*); . = ALIGN(4); }
+    .data   : ALIGN(4) { *(.data*); . = ALIGN(8); *(.bss* COMMON); . = ALIGN(8); }
+
+    . = ALIGN(4);
+
+    __stack_top = 0x1FFFF800;
+}

screeninit/source/boot.s

@@ -0,0 +1,31 @@
+@ This file was kindly provided by Wolfvak - thank you!
+
+.section .text.boot
+.arm
+
+.global __boot
+__boot:
+    @ Disable interrupts and switch to Supervisor
+    cpsid aif, #0x13
+
+    @ Writeback and invalidate caches
+    mov r0, #0
+    mcr p15, 0, r0, c7, c7, 0
+    mcr p15, 0, r0, c7, c14, 0
+    mcr p15, 0, r0, c7, c10, 4
+
+    ldr sp, =__stack_top
+
+    @ Reset values
+    ldr r0, =0x00054078
+    ldr r1, =0x0000000F
+    ldr r2, =0x00000000
+
+    @ MMU disabled, Caches disabled, other misc crap going on
+    mcr p15, 0, r0, c1, c0, 0
+    mcr p15, 0, r1, c1, c0, 1
+    mcr p15, 0, r2, c1, c0, 2
+
+    bl main
+
+    b __boot

screeninit/source/main.c

@@ -0,0 +1,129 @@
+// screeninit source taken over from https://github.com/AuroraWright/arm9loaderhax/tree/master/payload_stage2/arm11
+// check there for license info
+// thanks go to AuroraWright
+#include "types.h"
+
+// see: https://github.com/AuroraWright/Luma3DS/blob/53209b9be0c264af00fb81b32146d27f0d9498ac/source/screen.h#L32-L34
+#define PDN_GPU_CNT (*(vu8  *)0x10141200)
+#define ARESCREENSINITIALIZED (PDN_GPU_CNT != 1)
+
+#define BRIGHTNESS 0x39
+
+void main(void)
+{
+    vu32 *arm11Entry = (vu32 *)0x1FFFFFFC;
+    if (ARESCREENSINITIALIZED) return; // nothing to do in that case
+
+    *(vu32 *)0x10141200 = 0x1007F;
+    *(vu32 *)0x10202014 = 0x00000001;
+    *(vu32 *)0x1020200C &= 0xFFFEFFFE;
+
+    *(vu32 *)0x10202240 = BRIGHTNESS;
+    *(vu32 *)0x10202A40 = BRIGHTNESS;
+    *(vu32 *)0x10202244 = 0x1023E;
+    *(vu32 *)0x10202A44 = 0x1023E;
+
+    //Top screen
+    *(vu32 *)0x10400400 = 0x000001c2;
+    *(vu32 *)0x10400404 = 0x000000d1;
+    *(vu32 *)0x10400408 = 0x000001c1;
+    *(vu32 *)0x1040040c = 0x000001c1;
+    *(vu32 *)0x10400410 = 0x00000000;
+    *(vu32 *)0x10400414 = 0x000000cf;
+    *(vu32 *)0x10400418 = 0x000000d1;
+    *(vu32 *)0x1040041c = 0x01c501c1;
+    *(vu32 *)0x10400420 = 0x00010000;
+    *(vu32 *)0x10400424 = 0x0000019d;
+    *(vu32 *)0x10400428 = 0x00000002;
+    *(vu32 *)0x1040042c = 0x00000192;
+    *(vu32 *)0x10400430 = 0x00000192;
+    *(vu32 *)0x10400434 = 0x00000192;
+    *(vu32 *)0x10400438 = 0x00000001;
+    *(vu32 *)0x1040043c = 0x00000002;
+    *(vu32 *)0x10400440 = 0x01960192;
+    *(vu32 *)0x10400444 = 0x00000000;
+    *(vu32 *)0x10400448 = 0x00000000;
+    *(vu32 *)0x1040045C = 0x00f00190;
+    *(vu32 *)0x10400460 = 0x01c100d1;
+    *(vu32 *)0x10400464 = 0x01920002;
+    *(vu32 *)0x10400468 = 0x18300000;
+    *(vu32 *)0x10400470 = 0x80341;
+    *(vu32 *)0x10400474 = 0x00010501;
+    *(vu32 *)0x10400478 = 0;
+    *(vu32 *)0x10400490 = 0x000002D0;
+    *(vu32 *)0x1040049C = 0x00000000;
+
+    //Disco register
+    for(u32 i = 0; i < 256; i++)
+        *(vu32 *)0x10400484 = 0x10101 * i;
+
+    //Bottom screen
+    *(vu32 *)0x10400500 = 0x000001c2;
+    *(vu32 *)0x10400504 = 0x000000d1;
+    *(vu32 *)0x10400508 = 0x000001c1;
+    *(vu32 *)0x1040050c = 0x000001c1;
+    *(vu32 *)0x10400510 = 0x000000cd;
+    *(vu32 *)0x10400514 = 0x000000cf;
+    *(vu32 *)0x10400518 = 0x000000d1;
+    *(vu32 *)0x1040051c = 0x01c501c1;
+    *(vu32 *)0x10400520 = 0x00010000;
+    *(vu32 *)0x10400524 = 0x0000019d;
+    *(vu32 *)0x10400528 = 0x00000052;
+    *(vu32 *)0x1040052c = 0x00000192;
+    *(vu32 *)0x10400530 = 0x00000192;
+    *(vu32 *)0x10400534 = 0x0000004f;
+    *(vu32 *)0x10400538 = 0x00000050;
+    *(vu32 *)0x1040053c = 0x00000052;
+    *(vu32 *)0x10400540 = 0x01980194;
+    *(vu32 *)0x10400544 = 0x00000000;
+    *(vu32 *)0x10400548 = 0x00000011;
+    *(vu32 *)0x1040055C = 0x00f00140;
+    *(vu32 *)0x10400560 = 0x01c100d1;
+    *(vu32 *)0x10400564 = 0x01920052;
+    *(vu32 *)0x10400568 = 0x18300000 + 0x46500;
+    *(vu32 *)0x10400570 = 0x80301;
+    *(vu32 *)0x10400574 = 0x00010501;
+    *(vu32 *)0x10400578 = 0;
+    *(vu32 *)0x10400590 = 0x000002D0;
+    *(vu32 *)0x1040059C = 0x00000000;
+
+    //Disco register
+    for(u32 i = 0; i < 256; i++)
+        *(vu32 *)0x10400584 = 0x10101 * i;
+
+    //Set CakeBrah framebuffers
+    fb->top_left = (u8 *)0x18300000;
+    fb->top_right = (u8 *)0x18300000;
+    fb->bottom = (u8 *)0x18346500;
+
+    *(vu32 *)0x10400468 = (u32)fb->top_left;
+    *(vu32 *)0x1040046c = (u32)fb->top_left;
+    *(vu32 *)0x10400494 = (u32)fb->top_right;
+    *(vu32 *)0x10400498 = (u32)fb->top_right;
+    *(vu32 *)0x10400568 = (u32)fb->bottom;
+    *(vu32 *)0x1040056c = (u32)fb->bottom;
+
+    vu32 *REGs_PSC0 = (vu32 *)0x10400010,
+         *REGs_PSC1 = (vu32 *)0x10400020;
+
+    REGs_PSC0[0] = (u32)fb->top_left >> 3; //Start address
+    REGs_PSC0[1] = (u32)(fb->top_left + SCREEN_TOP_FBSIZE) >> 3; //End address
+    REGs_PSC0[2] = 0; //Fill value
+    REGs_PSC0[3] = (2 << 8) | 1; //32-bit pattern; start
+
+    REGs_PSC1[0] = (u32)fb->bottom >> 3; //Start address
+    REGs_PSC1[1] = (u32)(fb->bottom + SCREEN_BOTTOM_FBSIZE) >> 3; //End address
+    REGs_PSC1[2] = 0; //Fill value
+    REGs_PSC1[3] = (2 << 8) | 1; //32-bit pattern; start
+
+    while(!((REGs_PSC0[3] & 2) && (REGs_PSC1[3] & 2)));
+
+    //Clear ARM11 entrypoint
+    *arm11Entry = 0;
+
+    //Wait for the entrypoint to be set
+    while(!*arm11Entry);
+
+    //Jump to it
+    ((void (*)())*arm11Entry)();
+}

screeninit/source/types.h

@@ -0,0 +1,25 @@
+#pragma once
+
+#include <stdint.h>
+
+//Common data types
+typedef uint8_t u8;
+typedef uint16_t u16;
+typedef uint32_t u32;
+typedef uint64_t u64;
+typedef volatile u8 vu8;
+typedef volatile u16 vu16;
+typedef volatile u32 vu32;
+typedef volatile u64 vu64;
+
+#define SCREEN_TOP_WIDTH     400
+#define SCREEN_BOTTOM_WIDTH  320
+#define SCREEN_HEIGHT        240
+#define SCREEN_TOP_FBSIZE    (3 * SCREEN_TOP_WIDTH * SCREEN_HEIGHT)
+#define SCREEN_BOTTOM_FBSIZE (3 * SCREEN_BOTTOM_WIDTH * SCREEN_HEIGHT)
+
+static volatile struct fb {
+     u8 *top_left;
+     u8 *top_right;
+     u8 *bottom;
+} *const fb = (volatile struct fb *)0x23FFFE00;

source/main.c

@@ -1,12 +1,16 @@
 #include "common.h"
 #include "godmode.h"
 #include "ui.h"
+#include "i2c.h"
 #include "power.h"
 
 u8 *top_screen, *bottom_screen;
 
 void main(int argc, char** argv)
 {
+    // Turn on backlight
+    I2C_writeReg(I2C_DEV_MCU, 0x22, 0x2A);
+
     // Fetch the framebuffer addresses
     if(argc >= 2) {
         // newer entrypoints
@@ -18,6 +22,7 @@ void main(int argc, char** argv)
         top_screen = (u8*)(*(u32*)0x23FFFE00);
         bottom_screen = (u8*)(*(u32*)0x23FFFE08);
     }
-    u32 godmode_exit = GodMode();
-    (godmode_exit == GODMODE_EXIT_REBOOT) ? Reboot() : PowerOff();
+
+    // Run the main program
+    (GodMode() == GODMODE_EXIT_REBOOT) ? Reboot() : PowerOff();
 }