dldi acceleration patching works in no$gba for some homebrew

Author: ahezard

bootloader/source/hook.c

@@ -78,27 +78,34 @@ static const u32 homebrewSigPatched[5] = {
 	0xEA000000, // b      got_handler
 	0x037C0010  // DCD 	  0x037C0010       
 };
-
+ 
 // accelerator patch for IPC_SYNC
 static const u32 homebrewAccelSig[4] = {
-	0x2201B510   , // .
+	0x2401B510   , // .
 	               // MOVS    R4, #1
 	0xD0064220   , // .
 				// .
 	0x881A4B10   , // ...
 	0x430A2108   , // ...
 };	
 
-
-
-static const u32 homebrewAccelSigPatched[4] = {
+/*static const u32 homebrewAccelSigPatched[4] = {
 	0x2201B510   , // .
 	               // MOVS    R4, #1
 	0x43180423   , // LSLS    R3, R4, #0x10 // IRQ IPC SYNC
 				   // ORRS    R0, R3        // ENABLE THE BIT
 	0x881A4B10   , // ...
 	0x430A2108   , // ...
-};	
+};	*/
+
+static const u32 homebrewAccelSigPatched[4] = {
+	0x47104A00   , // LDR     R2, =0x037C0014
+	               // BX      R2
+	0x037C0020   , // 
+				   // 
+	0x881A4B10   , // ...
+	0x430A2108   , // ...
+};
 
 static const int MAX_HANDLER_SIZE = 50;
 

sdengine/source/sdmmcEngine.c

@@ -173,34 +173,62 @@ static u32* restoreInterruptHandlerHomebrew (u32* addr, u32 size) {
 	return addr;
 }
 
-void myIrqHandler(void) {
-	//dbg_printf("myIrqHandler\n");	
-	//REG_IE       |= IRQ_IPC_SYNC;
+//---------------------------------------------------------------------------------
+void SyncHandler(void) {
+//---------------------------------------------------------------------------------
+	nocashMessage("SyncHandler");
+	runSdMmcEngineCheck();
+}
 
-	/*if(!initialized) {	
+//---------------------------------------------------------------------------------
+void checkIRQ_IPC_SYNC() {
+//---------------------------------------------------------------------------------
+	if(!initialized) {	
 		nocashMessage("!initialized");	
-		u32* current=irqHandler+4;
+		u32* current=irqHandler+1;
 
-		while(*current!=IRQ_IPC_SYNC && *current) {
-			current+=8;
+		while(*current!=IRQ_IPC_SYNC && *current!=0) {
+			current+=2;
 		}
+		if(current==IRQ_IPC_SYNC) {
+			nocashMessage("IRQ_IPC_SYNC slot found");	
+		} else {
+			nocashMessage("empty irqtable slot found");	
+		}		
 
-		nocashMessage("empty irqtable slot found");	
-		
-		*((IntFn*)current-4)	= runSdMmcEngineCheck;
+		*((IntFn*)current-1)	= SyncHandler;
 		*current				= IRQ_IPC_SYNC;
 
 		nocashMessage("IRQ_IPC_SYNC setted");
-		
-		REG_IPC_SYNC |= IPC_SYNC_IRQ_ENABLE;	
-		REG_IE       |= IRQ_IPC_SYNC;
-		
-		nocashMessage("IRQ_IPC_SYNC enabled");	
-		// restore the irq Handler for better compatibility
-		// restoreInterruptHandlerHomebrew(irqSig-8,24);
+	
 		initialized = true;
-	}*/	
+	}	
+}
+
+
+void myIrqHandler(void) {
+	//dbg_printf("myIrqHandler\n");	
+	
+	checkIRQ_IPC_SYNC();
 	runSdMmcEngineCheck();
 }
 
+void myIrqEnable(u32 irq) {	
+	dbg_printf("myIrqEnable\n");
+	int oldIME = enterCriticalSection();	
+	if (irq & IRQ_VBLANK)
+		REG_DISPSTAT |= DISP_VBLANK_IRQ ;
+	if (irq & IRQ_HBLANK)
+		REG_DISPSTAT |= DISP_HBLANK_IRQ ;
+	if (irq & IRQ_VCOUNT)
+		REG_DISPSTAT |= DISP_YTRIGGER_IRQ;
+		
+	irq |= IRQ_IPC_SYNC;
+	REG_IPC_SYNC |= IPC_SYNC_IRQ_ENABLE;
+	nocashMessage("IRQ_IPC_SYNC enabled");
+
+	REG_IE |= irq;
+	leaveCriticalSection(oldIME);
+}
+
 

sdengine/source/sdmmcEngine.h

@@ -25,6 +25,8 @@ extern "C" {
 
 void myIrqHandler(void);
 
+void myIrqEnable(u32 irq);
+
 void runSdMmcEngineCheck (void);
 
 

sdengine/source/sdmmc_engine_header.s

@@ -26,11 +26,21 @@ irqSig:
 @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
 
 sdmmc_engine_start:
+sdmmc_engine_irqHandler:
 	ldr	r1, =irqHandler			@ user IRQ handler address
 	cmp	r1, #0
 	bne	call_handler
 	bx  lr
 
+sdmmc_engine_irqEnable:
+    push    {lr}
+	push	{r1-r12}
+	ldr	r3, =myIrqEnable
+	bl	_blx_r3_stub		@ jump to myIrqEnable	
+	pop   	{r1-r12} 
+	pop  	{lr}
+	bx  lr
+
 call_handler:
 	push    {lr}
 	adr 	lr, code_handler_start
@@ -41,7 +51,7 @@ call_handler:
 code_handler_start:
 	push	{r0-r12} 
 	ldr	r3, =myIrqHandler
-	bl	_blx_r3_stub		@ jump to user code
+	bl	_blx_r3_stub		@ jump to myIrqHandler
 
   @ exit after return
 	b	exit