CGBASupport (#13)

* Start work on GBASupport

* Match update

* Almost perfect match

* Very close to 100% match

* Match & link CGBASupport

* Fix some naming

* use c-cstle cast and round-up

asm/MetroidPrime/CFrontEndUI.s

@@ -7734,7 +7734,7 @@ Update__13SGBALinkFrameFf:
 /* 80022024 0001EF84  93 E1 00 14 */	stw r31, 0x14(r1)
 /* 80022028 0001EF88  7C 7F 1B 78 */	mr r31, r3
 /* 8002202C 0001EF8C  80 63 00 04 */	lwz r3, 4(r3)
-/* 80022030 0001EF90  48 22 68 E9 */	bl Update__11CGBASupportFv
+/* 80022030 0001EF90  48 22 68 E9 */	bl Update__11CGBASupportFf
 /* 80022034 0001EF94  FC 20 F8 90 */	fmr f1, f31
 /* 80022038 0001EF98  80 7F 00 08 */	lwz r3, 8(r31)
 /* 8002203C 0001EF9C  48 2A 06 C9 */	bl Update__9CGuiFrameFf

asm/MetroidPrime/CGBASupport.s

@@ -32,8 +32,8 @@ lbl_805A82BC:
 .section .sbss, "wa"
 .balign 8
 
-.global lbl_805A9110
+.global g_GBA
-lbl_805A9110:
+g_GBA:
 	.skip 0x8
 
 .section .text, "ax"
@@ -545,8 +545,8 @@ lbl_802488F8:
 
 .endif
 
-.global Update__11CGBASupportFv
+.global Update__11CGBASupportFf
-Update__11CGBASupportFv:
+Update__11CGBASupportFf:
 /* 80248918 00245878  94 21 FF D0 */	stwu r1, -0x30(r1)
 /* 8024891C 0024587C  7C 08 02 A6 */	mflr r0
 /* 80248920 00245880  90 01 00 34 */	stw r0, 0x34(r1)
@@ -671,9 +671,9 @@ lbl_80248A5C:
 /* 80248A7C 002459DC  48 00 00 D8 */	b Update_default
 Update_case4:
 /* 80248A80 002459E0  38 00 00 05 */	li r0, 5
-/* 80248A84 002459E4  3C 60 80 25 */	lis r3, nullsub_130@ha
+/* 80248A84 002459E4  3C 60 80 25 */	lis r3, joyboot_callback__Fll@ha
 /* 80248A88 002459E8  90 1F 00 34 */	stw r0, 0x34(r31)
-/* 80248A8C 002459EC  39 23 8D D8 */	addi r9, r3, nullsub_130@l
+/* 80248A8C 002459EC  39 23 8D D8 */	addi r9, r3, joyboot_callback__Fll@l
 /* 80248A90 002459F0  39 1F 00 3C */	addi r8, r31, 0x3c
 /* 80248A94 002459F4  38 A0 00 02 */	li r5, 2
 /* 80248A98 002459F8  80 7F 00 40 */	lwz r3, 0x40(r31)
@@ -904,7 +904,7 @@ __dt__11CGBASupportFv:
 /* 80248C98 00245BF8  41 82 00 60 */	beq lbl_80248CF8
 /* 80248C9C 00245BFC  38 60 00 00 */	li r3, 0
 /* 80248CA0 00245C00  34 1E 00 30 */	addic. r0, r30, 0x30
-/* 80248CA4 00245C04  90 6D A5 50 */	stw r3, lbl_805A9110@sda21(r13)
+/* 80248CA4 00245C04  90 6D A5 50 */	stw r3, g_GBA@sda21(r13)
 /* 80248CA8 00245C08  41 82 00 24 */	beq lbl_80248CCC
 /* 80248CAC 00245C0C  80 7E 00 30 */	lwz r3, 0x30(r30)
 /* 80248CB0 00245C10  28 03 00 00 */	cmplwi r3, 0
@@ -992,7 +992,7 @@ lbl_80248E38:
 /* 80248EB8 00245E18  98 7F 00 44 */	stb r3, 0x44(r31)
 /* 80248EBC 00245E1C  98 7F 00 45 */	stb r3, 0x45(r31)
 /* 80248EC0 00245E20  48 18 08 91 */	bl GBAInit
-/* 80248EC4 00245E24  93 ED A5 50 */	stw r31, lbl_805A9110@sda21(r13)
+/* 80248EC4 00245E24  93 ED A5 50 */	stw r31, g_GBA@sda21(r13)
 /* 80248EC8 00245E28  48 13 81 ED */	bl OSGetFontEncode
 /* 80248ECC 00245E2C  80 01 00 24 */	lwz r0, 0x24(r1)
 /* 80248ED0 00245E30  7F E3 FB 78 */	mr r3, r31
@@ -1047,7 +1047,7 @@ __ct__11CGBASupportFv:
 /* 80248DB0 00245D10  98 7F 00 44 */	stb r3, 0x44(r31)
 /* 80248DB4 00245D14  98 7F 00 45 */	stb r3, 0x45(r31)
 /* 80248DB8 00245D18  48 18 08 95 */	bl GBAInit
-/* 80248DBC 00245D1C  93 ED A5 50 */	stw r31, lbl_805A9110@sda21(r13)
+/* 80248DBC 00245D1C  93 ED A5 50 */	stw r31, g_GBA@sda21(r13)
 /* 80248DC0 00245D20  7F E3 FB 78 */	mr r3, r31
 /* 80248DC4 00245D24  80 01 00 24 */	lwz r0, 0x24(r1)
 /* 80248DC8 00245D28  83 E1 00 1C */	lwz r31, 0x1c(r1)
@@ -1057,8 +1057,8 @@ __ct__11CGBASupportFv:
 
 .endif
 
-.global nullsub_130
+.global joyboot_callback__Fll
-nullsub_130:
+joyboot_callback__Fll:
 /* 80248DD8 00245D38  4E 80 00 20 */	blr
 
 .section .sdata2, "a"

configure.py

@@ -12,7 +12,7 @@ parser.add_argument('--version', dest='version',
                     default='0', help='version to build (0, 1, kor)')
 parser.add_argument('--map', dest='map', action='store_true',
                     help='generate map file')
-parser.add_argument('--no-check', dest='check', action='store_false', 
+parser.add_argument('--no-check', dest='check', action='store_false',
                     help='don\'t check hash of resulting dol')
 parser.add_argument('--static-libs', dest='static_libs', action='store_true',
                     help='build and use static libs')
@@ -343,7 +343,7 @@ LIBS = [
             "MetroidPrime/CPauseScreenFrame",
             "MetroidPrime/Enemies/CAtomicAlpha",
             "MetroidPrime/CLogBookScreen",
-            "MetroidPrime/CGBASupport",
+            ["MetroidPrime/CGBASupport", True],
             "MetroidPrime/Player/CSaveWorld",
             "MetroidPrime/ScriptObjects/CScriptCameraHintTrigger",
             "MetroidPrime/Enemies/CAmbientAI",
@@ -1193,7 +1193,7 @@ for lib in LIBS:
     else:
         for object in lib["objects"]:
             completed = False
-            
+
             if type(object) is list:
                 completed = object[1]
                 object = object[0]

include/Kyoto/Alloc/CMemory.hpp

@@ -3,6 +3,7 @@
 
 #include "types.h"
 #include "Kyoto/Alloc/IAllocator.hpp"
+#include "Kyoto/Alloc/CCallStack.hpp"
 
 class COsContext;
 class CMemory {
@@ -14,7 +15,9 @@ public:
   static void Shutdown();
   static void SetAllocator(COsContext& ctx, IAllocator& allocator);
   static IAllocator* GetAllocator();
-  static void* Alloc(size_t len, IAllocator::EHint hint, IAllocator::EScope scope, IAllocator::EType type, const CCallStack& callstack);
+  static void* Alloc(size_t len, IAllocator::EHint hint = IAllocator::kHI_None,
+                     IAllocator::EScope scope = IAllocator::kSC_Unk1, IAllocator::EType type = IAllocator::kTP_Heap,
+                     const CCallStack& callstack = CCallStack(-1, "??(??)"));
   static void Free(const void* ptr);
   static void SetOutOfMemoryCallback(IAllocator::FOutOfMemoryCb callback, const void* context);
   static void OffsetFakeStatics(int);

include/Kyoto/CDvdFile.hpp

@@ -3,12 +3,28 @@
 
 #include "types.h"
 
+class IDvdRequest {
+public:
+  virtual ~IDvdRequest() = 0; // 8
+  virtual void Unknown1(bool) = 0; // c
+  virtual bool IsComplete() = 0; // 10
+};
+
 class CDvdFile {
 public:
+  CDvdFile(const char* name);
+  ~CDvdFile();
+  uint Length() { return x14_size; }
+
+  IDvdRequest* SyncRead(void* buf, uint len);
+
   static bool FileExists(const char*);
 
 private:
-  uchar pad[0x28];
+  uchar pad[0x14];
+  uint x14_size;
+  uchar pad2[0x10];
 };
+CHECK_SIZEOF(CDvdFile, 0x28)
 
 #endif // _CDVDFILE

include/MetroidPrime/CGBASupport.hpp

@@ -0,0 +1,55 @@
+#ifndef _CGBASUPPORT
+#define _CGBASUPPORT
+
+#include "Kyoto/CDvdFile.hpp"
+#include "rstl/auto_ptr.hpp"
+#include "rstl/single_ptr.hpp"
+#include "rstl/rc_ptr.hpp"
+
+class CGBASupport {
+public:
+  enum EPhase {
+    kP_LoadClientPad,
+    kP_Standby,
+    kP_StartProbeTimeout,
+    kP_PollProbe,
+    kP_StartJoyBusBoot,
+    kP_PollJoyBusBoot,
+    kP_DataTransfer,
+    kP_Complete,
+    kP_Failed
+  };
+
+private:
+  CDvdFile x0_file;
+  uint x28_fileSize;
+  rstl::single_ptr<uchar> x2c_buffer;
+  rstl::single_ptr<IDvdRequest> x30_dvdReq;
+  EPhase x34_phase;
+  float x38_timeout;
+  uchar x3c_status;
+  uint x40_siChan;
+  bool x44_fusionLinked;
+  bool x45_fusionBeat;
+
+// this is inlined weirdly... this probably should be handled differently
+  bool CheckReadyStatus();
+public:
+  static void Initialize();
+  static void GlobalPoll();
+
+  CGBASupport();
+  ~CGBASupport();
+  bool PollResponse();
+  void Update(float dt);
+  bool IsReady();
+  void InitializeSupport();
+  void StartLink();
+  EPhase GetPhase() const { return x34_phase; }
+  bool IsFusionLinked() const { return x44_fusionLinked; }
+  bool IsFusionBeat() const { return x45_fusionBeat; }
+};
+
+extern CGBASupport* g_GBA;
+
+#endif // _CGBASUPPORT

include/rstl/rc_ptr.hpp

@@ -35,6 +35,7 @@ public:
   }
   T* operator->() const { return GetPtr(); }
   T& operator*() const { return *GetPtr(); }
+  operator bool() const { return GetPtr() != nullptr; }
 
 private:
   CRefData* x0_refData;

obj_files.mk

@@ -1,6 +1,6 @@
 METROTRK_FILES :=\
 	$(BUILD_DIR)/src/MetroTRK/mslsupp.o
-	
+
 METROIDPRIME :=\
 	$(BUILD_DIR)/asm/MetroidPrime/main.o\
 	$(BUILD_DIR)/asm/MetroidPrime/IRenderer.o\
@@ -310,7 +310,7 @@ METROIDPRIME :=\
 	$(BUILD_DIR)/asm/MetroidPrime/CPauseScreenFrame.o\
 	$(BUILD_DIR)/asm/MetroidPrime/Enemies/CAtomicAlpha.o\
 	$(BUILD_DIR)/asm/MetroidPrime/CLogBookScreen.o\
-	$(BUILD_DIR)/asm/MetroidPrime/CGBASupport.o\
+	$(BUILD_DIR)/src/MetroidPrime/CGBASupport.o\
 	$(BUILD_DIR)/asm/MetroidPrime/Player/CSaveWorld.o\
 	$(BUILD_DIR)/asm/MetroidPrime/ScriptObjects/CScriptCameraHintTrigger.o\
 	$(BUILD_DIR)/asm/MetroidPrime/Enemies/CAmbientAI.o\
@@ -370,7 +370,7 @@ WORLDFORMAT :=\
 	$(BUILD_DIR)/asm/WorldFormat/CCollidableOBBTreeGroup.o\
 	$(BUILD_DIR)/asm/WorldFormat/CPVSAreaSet.o\
 	$(BUILD_DIR)/asm/WorldFormat/CAreaRenderOctTree.o\
-	
+
 WEAPONS :=\
 	$(BUILD_DIR)/asm/Weapons/CProjectileWeapon.o\
 	$(BUILD_DIR)/asm/Weapons/CProjectileWeaponDataFactory.o\
@@ -380,10 +380,10 @@ WEAPONS :=\
 	$(BUILD_DIR)/asm/Weapons/CDecal.o\
 	$(BUILD_DIR)/asm/Weapons/CWeaponDescription.o\
 	$(BUILD_DIR)/asm/Weapons/CDecalDescription.o\
-	
+
 METARENDER :=\
 	$(BUILD_DIR)/asm/MetaRender/CCubeRenderer.o\
-	
+
 GUISYS :=\
 	$(BUILD_DIR)/asm/GuiSys/CAuiMain.o\
 	$(BUILD_DIR)/asm/GuiSys/CAuiMeter.o\
@@ -631,25 +631,25 @@ KYOTO_2 :=\
 	$(BUILD_DIR)/src/Kyoto/Audio/g721.o\
 	$(BUILD_DIR)/asm/Kyoto/Audio/CStaticAudioPlayer.o\
 	$(BUILD_DIR)/asm/Kyoto/CFrameDelayedKiller.o\
-	
+
 AI_FILES :=\
 	$(BUILD_DIR)/asm/Dolphin/ai.o\
-	
+
 AR_FILES :=\
 	$(BUILD_DIR)/asm/Dolphin/ar/ar.o\
 	$(BUILD_DIR)/asm/Dolphin/ar/arq.o
-	
+
 BASE_FILES :=\
 	$(BUILD_DIR)/src/Dolphin/PPCArch.o\
-	
+
 DB_FILES :=\
 	$(BUILD_DIR)/src/Dolphin/db.ep.o\
-	
+
 DSP_FILES :=\
 	$(BUILD_DIR)/asm/Dolphin/dsp/dsp.o\
 	$(BUILD_DIR)/src/Dolphin/dsp/dsp_debug.o\
 	$(BUILD_DIR)/asm/Dolphin/dsp/dsp_task.o
-	
+
 DVD_FILES :=\
 	$(BUILD_DIR)/asm/Dolphin/dvd/dvdlow.o\
 	$(BUILD_DIR)/asm/Dolphin/dvd/dvdfs.o\
@@ -659,7 +659,7 @@ DVD_FILES :=\
 	$(BUILD_DIR)/asm/Dolphin/dvd/dvdidutils.o\
 	$(BUILD_DIR)/asm/Dolphin/dvd/dvdfatal.o\
 	$(BUILD_DIR)/asm/Dolphin/dvd/fstload.o
-	
+
 GX_FILES :=\
 	$(BUILD_DIR)/asm/Dolphin/gx/GXInit.o\
 	$(BUILD_DIR)/asm/Dolphin/gx/GXFifo.o\
@@ -711,10 +711,10 @@ OS_FILES :=\
 PAD_FILES :=\
 	$(BUILD_DIR)/src/Dolphin/pad/PadClamp.ep.o\
 	$(BUILD_DIR)/asm/Dolphin/pad/pad.o
-	
+
 VI_FILES :=\
 	$(BUILD_DIR)/asm/Dolphin/vi.o
-	
+
 MSL_PPCEABI_BARE_H :=\
 	$(BUILD_DIR)/src/Runtime/__mem.o\
 	$(BUILD_DIR)/src/Runtime/__va_arg.o\
@@ -782,7 +782,7 @@ MSL_COMMON_MATH :=\
 	$(BUILD_DIR)/src/Runtime/w_log.o\
 	$(BUILD_DIR)/src/Runtime/w_pow.o\
 	$(BUILD_DIR)/src/Runtime/math_ppc.o\
-	
+
 MUSYX_FILES :=\
 	$(BUILD_DIR)/asm/musyx/seq.o\
 	$(BUILD_DIR)/asm/musyx/synth.o\
@@ -815,10 +815,10 @@ MUSYX_FILES :=\
 	$(BUILD_DIR)/asm/musyx/reverb.o\
 	$(BUILD_DIR)/src/musyx/delay_fx.o\
 	$(BUILD_DIR)/asm/musyx/chorus_fx.o\
-	
+
 DTK_FILES :=\
 	$(BUILD_DIR)/src/Dolphin/dtk.o
-	
+
 CARD_FILES :=\
 	$(BUILD_DIR)/asm/Dolphin/card/CARDBios.o\
 	$(BUILD_DIR)/src/Dolphin/card/CARDUnlock.ep.o\
@@ -836,11 +836,11 @@ CARD_FILES :=\
 	$(BUILD_DIR)/src/Dolphin/card/CARDStat.ep.o\
 	$(BUILD_DIR)/src/Dolphin/card/CARDRename.ep.o\
 	$(BUILD_DIR)/src/Dolphin/card/CARDNet.ep.o
-	
+
 SI_FILES :=\
 	$(BUILD_DIR)/asm/Dolphin/si/SIBios.o\
 	$(BUILD_DIR)/src/Dolphin/si/SISamplingRate.ep.o
-	
+
 EXI_FILES :=\
 	$(BUILD_DIR)/asm/Dolphin/exi/EXIBios.o\
 	$(BUILD_DIR)/asm/Dolphin/exi/EXIUart.o
@@ -848,7 +848,7 @@ EXI_FILES :=\
 THP_FILES :=\
 	$(BUILD_DIR)/asm/Dolphin/thp/THPDec.o\
 	$(BUILD_DIR)/asm/Dolphin/thp/THPAudio.o
-	
+
 GBA_FILES :=\
 	$(BUILD_DIR)/src/Dolphin/GBA/GBA.ep.o\
 	$(BUILD_DIR)/asm/Dolphin/GBA/GBAGetProcessStatus.o\

src/Dolphin/GBA/GBAWrite.c

@@ -12,7 +12,7 @@ void WriteProc(s32 chan) {
 }
 
 s32 GBAWriteAsync(s32 chan, u8* src, u8* status, GBACallback callback) {
-  GBA* gba; 
+  GBA* gba;
   s32 ret;
   gba = &__GBA[chan];
 

src/MetroidPrime/CGBASupport.cpp

@@ -0,0 +1,217 @@
+#include "MetroidPrime/CGBASupport.hpp"
+#include "Kyoto/Alloc/CCallStack.hpp"
+#include "Kyoto/Alloc/CMemory.hpp"
+#include "Kyoto/Basics/CBasics.hpp"
+#include "dolphin/gba.h"
+#include "dolphin/os.h"
+#include "dolphin/os/OSSerial.h"
+#include "rstl/math.hpp"
+
+void joyboot_callback(s32 chan, s32 ret) {}
+
+const uint MAGIC = 0x414d5445;
+
+static CGBASupport* g_GBA;
+
+CGBASupport::CGBASupport()
+: x0_file("client_pad.bin")
+, x28_fileSize(OSRoundUp32B(x0_file.Length()))
+, x2c_buffer((uchar*)CMemory::Alloc(x28_fileSize, IAllocator::kHI_RoundUpLen))
+, x30_dvdReq(x0_file.SyncRead(x2c_buffer.get(), x28_fileSize))
+, x34_phase(kP_LoadClientPad)
+, x38_timeout(0.f)
+, x3c_status(0)
+, x40_siChan(-1)
+, x44_fusionLinked(false)
+, x45_fusionBeat(false) {
+  GBAInit();
+  g_GBA = this;
+}
+
+CGBASupport::~CGBASupport() { g_GBA = nullptr; }
+
+void CGBASupport::InitializeSupport() {
+  x34_phase = kP_Standby;
+  x38_timeout = 0.f;
+  x3c_status = 0;
+  x40_siChan = -1;
+  x44_fusionLinked = false;
+  x45_fusionBeat = false;
+}
+
+void CGBASupport::StartLink() {
+  x34_phase = kP_StartProbeTimeout;
+  x40_siChan = -1;
+}
+
+inline bool CGBASupport::CheckReadyStatus() {
+  if (x34_phase != kP_LoadClientPad)
+    return true;
+  if (x30_dvdReq->IsComplete()) {
+    x30_dvdReq = nullptr;
+    x34_phase = kP_Standby;
+    uchar* buff = x2c_buffer.get();
+    u32 tick = OSGetTick();
+    buff[0xc8] = (tick >> 0);
+    buff[0xc9] = (tick >> 8);
+    buff[0xca] = (tick >> 16);
+    buff[0xcb] = (tick >> 24);
+    buff[0xaf] = 'E'; // set region to 'E' instead of 'J'
+    buff[0xbd] = 0xc9;
+    return true;
+  }
+  return false;
+}
+
+bool CGBASupport::IsReady() { return CheckReadyStatus(); }
+
+void CGBASupport::Update(float dt) {
+  switch (x34_phase) {
+  case kP_LoadClientPad:
+    CheckReadyStatus();
+    break;
+
+  case kP_StartProbeTimeout:
+    x38_timeout = 4.f;
+    x34_phase = kP_PollProbe;
+    // [[fallthrough]];
+
+  case kP_PollProbe:
+    int channel = 1;
+    do {
+      uint result = SIProbe(channel);
+      if (result == 0x40000) {
+        x40_siChan = channel;
+        x34_phase = kP_StartJoyBusBoot;
+        x38_timeout = 4.f;
+        goto end_switch;
+      }
+      channel++;
+    } while (channel < 4);
+    float newT = rstl::max_val(0.f, x38_timeout - dt);
+    x38_timeout = newT;
+    if (x38_timeout == 0.f) {
+      x34_phase = kP_Failed;
+    }
+    break;
+
+  case kP_StartJoyBusBoot:
+    x34_phase = kP_PollJoyBusBoot;
+    GBAJoyBootAsync(x40_siChan, x40_siChan << 1, 2, x2c_buffer.get(), x0_file.Length(),
+                    &x3c_status, &joyboot_callback);
+    break;
+
+  case kP_PollJoyBusBoot:
+    int status = GBAGetProcessStatus(x40_siChan, &x3c_status);
+    if (status != GBA_BUSY) {
+      if (GBAGetStatus(x40_siChan, &x3c_status) == GBA_NOT_READY) {
+        x34_phase = kP_Failed;
+      } else {
+        x38_timeout = 4.f;
+        x34_phase = kP_DataTransfer;
+      }
+    }
+    break;
+  case kP_DataTransfer:
+    if (PollResponse()) {
+      x34_phase = kP_Complete;
+      break;
+    }
+    x38_timeout = rstl::max_val(0.f, x38_timeout - dt);
+    if (x38_timeout == 0.f)
+      x34_phase = kP_Failed;
+    break;
+  case kP_Complete:
+  case kP_Failed:
+    break;
+  }
+end_switch:;
+}
+
+inline uchar CalculateFusionJBusChecksum(const uchar* data, uint i) {
+  // const uchar* data = reinterpret_cast< const uchar* >(dataPtr);
+  // uint i = 3;
+  uint sum = -1;
+  do {
+    uchar ch = *data++;
+    sum ^= ch;
+    for (int j = 0; j < 8; ++j) {
+      if ((sum & 1)) {
+        sum >>= 1;
+        sum ^= 0xb010;
+      } else
+        sum >>= 1;
+    }
+  } while (--i);
+  return sum;
+}
+
+bool CGBASupport::PollResponse() {
+  uchar gbaStatus;
+  uint unk;
+
+  // Not sure why this is called twice
+  if (GBAReset(x40_siChan, &gbaStatus) == GBA_NOT_READY &&
+      GBAReset(x40_siChan, &gbaStatus) == GBA_NOT_READY) {
+    return false;
+  }
+  if (GBAGetStatus(x40_siChan, &gbaStatus) == GBA_NOT_READY) {
+    return false;
+  }
+  if (gbaStatus != 0x28) {
+    return false;
+  }
+  uint magic;
+  if (GBARead(x40_siChan, reinterpret_cast<u8*>(&magic), &gbaStatus) == GBA_NOT_READY) {
+    return false;
+  }
+  if (magic != 0x414d5445) { // "AMTE"
+    return false;
+  }
+  if (GBAGetStatus(x40_siChan, &gbaStatus) == GBA_NOT_READY) {
+    return false;
+  }
+  if (gbaStatus != 0x20) {
+    return false;
+  }
+  if (GBAWrite(x40_siChan, (u8*)(&MAGIC), &gbaStatus) == GBA_NOT_READY) {
+    return false;
+  }
+  if (GBAGetStatus(x40_siChan, &gbaStatus) == GBA_NOT_READY) {
+    return false;
+  }
+  if ((gbaStatus & 0x30) != 0x30) {
+    return false;
+  }
+  uint start = OSGetTick();
+  do {
+    uint current = OSGetTick();
+    if (OSTicksToMicroseconds(current - start) > 500) {
+      goto end;
+    }
+  } while ((GBAGetStatus(x40_siChan, &gbaStatus) == GBA_NOT_READY || (gbaStatus & 0x8) == 0) ||
+           (GBAGetStatus(x40_siChan, &gbaStatus) != GBA_READY || gbaStatus != 0x38));
+
+  uint read;
+  uchar fusionStatus[4];
+  if (GBARead(x40_siChan, reinterpret_cast<uchar*>(&read), &gbaStatus) != GBA_READY) {
+    return false;
+  }
+  fusionStatus[0] = read >> 24;
+  fusionStatus[1] = read >> 16;
+  fusionStatus[2] = read >> 8;
+  fusionStatus[3] = read;
+  if (fusionStatus[3] != CalculateFusionJBusChecksum(fusionStatus, 3)) {
+    return false;
+  }
+
+  x44_fusionLinked = (fusionStatus[2] & 0x2) == 0;
+  bool fusionBeat = false;
+  if (x44_fusionLinked != false && (fusionStatus[2] & 0x1) > 0) {
+    fusionBeat = true;
+  }
+  x45_fusionBeat = fusionBeat;
+
+end:
+  return true;
+}