Remove the BAT checkbox/setting/implementation.

The current version of the setting is useless, and the real implementation
(PR1882) will be always-on, and won't use any of the existing code.

Source/Core/Core/BootManager.cpp

@@ -47,7 +47,7 @@ namespace BootManager
 // Apply fire liberally
 struct ConfigCache
 {
-	bool valid, bCPUThread, bSkipIdle, bFPRF, bBAT, bMMU, bDCBZOFF, m_EnableJIT, bDSPThread,
+	bool valid, bCPUThread, bSkipIdle, bFPRF, bMMU, bDCBZOFF, m_EnableJIT, bDSPThread,
 	     bSyncGPU, bFastDiscSpeed, bDSPHLE, bHLE_BS2, bProgressive;
 	int iCPUCore, Volume;
 	int iWiimoteSource[MAX_BBMOTES];
@@ -114,7 +114,6 @@ bool BootCore(const std::string& _rFilename)
 		config_cache.bSkipIdle = StartUp.bSkipIdle;
 		config_cache.iCPUCore = StartUp.iCPUCore;
 		config_cache.bFPRF = StartUp.bFPRF;
-		config_cache.bBAT = StartUp.bBAT;
 		config_cache.bMMU = StartUp.bMMU;
 		config_cache.bDCBZOFF = StartUp.bDCBZOFF;
 		config_cache.bSyncGPU = StartUp.bSyncGPU;
@@ -154,7 +153,6 @@ bool BootCore(const std::string& _rFilename)
 		core_section->Get("CPUThread",        &StartUp.bCPUThread, StartUp.bCPUThread);
 		core_section->Get("SkipIdle",         &StartUp.bSkipIdle, StartUp.bSkipIdle);
 		core_section->Get("FPRF",             &StartUp.bFPRF, StartUp.bFPRF);
-		core_section->Get("BAT",              &StartUp.bBAT, StartUp.bBAT);
 		core_section->Get("MMU",              &StartUp.bMMU, StartUp.bMMU);
 		core_section->Get("DCBZ",             &StartUp.bDCBZOFF, StartUp.bDCBZOFF);
 		core_section->Get("SyncGPU",          &StartUp.bSyncGPU, StartUp.bSyncGPU);
@@ -281,7 +279,6 @@ void Stop()
 		StartUp.bSkipIdle = config_cache.bSkipIdle;
 		StartUp.iCPUCore = config_cache.iCPUCore;
 		StartUp.bFPRF = config_cache.bFPRF;
-		StartUp.bBAT = config_cache.bBAT;
 		StartUp.bMMU = config_cache.bMMU;
 		StartUp.bDCBZOFF = config_cache.bDCBZOFF;
 		StartUp.bSyncGPU = config_cache.bSyncGPU;

Source/Core/Core/CoreParameter.cpp

@@ -39,7 +39,7 @@ SCoreStartupParameter::SCoreStartupParameter()
   bEnableMemcardSaving(true),
   bDPL2Decoder(false), iLatency(14),
   bRunCompareServer(false), bRunCompareClient(false),
-  bBAT(false), bMMU(false), bDCBZOFF(false),
+  bMMU(false), bDCBZOFF(false),
   iBBDumpPort(0),
   bSyncGPU(false), bFastDiscSpeed(false),
   SelectedLanguage(0), bWii(false),
@@ -74,7 +74,6 @@ void SCoreStartupParameter::LoadDefaults()
 	bDSPHLE = true;
 	bFastmem = true;
 	bFPRF = false;
-	bBAT = false;
 	bMMU = false;
 	bDCBZOFF = false;
 	iBBDumpPort = -1;

Source/Core/Core/CoreParameter.h

@@ -180,7 +180,6 @@ struct SCoreStartupParameter
 	bool bRunCompareServer;
 	bool bRunCompareClient;
 
-	bool bBAT;
 	bool bMMU;
 	bool bDCBZOFF;
 	int iBBDumpPort;

Source/Core/Core/PowerPC/MMU.cpp

@@ -1013,79 +1013,12 @@ static __forceinline u32 TranslatePageAddress(const u32 address, const XCheckTLB
 	return 0;
 }
 
-#define BATU_BEPI(v) ((v)&0xfffe0000)
-#define BATU_BL(v)   (((v)&0x1ffc)>>2)
-#define BATU_Vs      (1<<1)
-#define BATU_Vp      (1)
-#define BATL_BRPN(v) ((v)&0xfffe0000)
-
-#define BAT_EA_OFFSET(v) ((v)&0x1ffff)
-#define BAT_EA_11(v)     ((v)&0x0ffe0000)
-#define BAT_EA_4(v)      ((v)&0xf0000000)
-
-static inline bool CheckAddrBats(const u32 addr, u32* result, u32 batu, u32 spr)
-{
-	for (int i = 0; i < 4; i++)
-	{
-		u32 bl17 = ~(BATU_BL(PowerPC::ppcState.spr[spr + i * 2]) << 17);
-		u32 addr2 = addr & (bl17 | 0xf001ffff);
-
-		if (BATU_BEPI(addr2) == BATU_BEPI(PowerPC::ppcState.spr[spr + i * 2]))
-		{
-			// bat applies to this address
-			if (PowerPC::ppcState.spr[spr + i * 2] & batu)
-			{
-				// bat entry valid
-				u32 offset = BAT_EA_OFFSET(addr);
-				u32 page = BAT_EA_11(addr);
-				page &= ~bl17;
-				page |= BATL_BRPN(PowerPC::ppcState.spr[spr + 1 + i * 2]);
-				// fixme: check access rights
-				*result = page | offset;
-				return true;
-			}
-		}
-	}
-	return false;
-}
-
-// Block Address Translation
-static u32 TranslateBlockAddress(const u32 address, const XCheckTLBFlag flag)
-{
-	u32 result = 0;
-	UReg_MSR& m_MSR = ((UReg_MSR&)PowerPC::ppcState.msr);
-	u32 batu = (m_MSR.PR ? BATU_Vp : BATU_Vs);
-
-	// Check for enhanced mode (secondary BAT enable) using 8 BATs
-	bool enhanced_bats = SConfig::GetInstance().m_LocalCoreStartupParameter.bWii && HID4.SBE;
-
-	if (flag != FLAG_OPCODE)
-	{
-		if (!CheckAddrBats(address, &result, batu, SPR_DBAT0U) && enhanced_bats)
-			CheckAddrBats(address, &result, batu, SPR_DBAT4U);
-	}
-	else
-	{
-		if (!CheckAddrBats(address, &result, batu, SPR_IBAT0U) && enhanced_bats)
-			CheckAddrBats(address, &result, batu, SPR_IBAT4U);
-	}
-	return result;
-}
-
 // Translate effective address using BAT or PAT.  Returns 0 if the address cannot be translated.
 template <const XCheckTLBFlag flag>
 __forceinline u32 TranslateAddress(const u32 address)
 {
-	// TODO: bBAT in theory should allow dynamic changes to the BAT registers.
-	// In reality, the option is mostly useless at the moment because we don't
-	// always translate addresses when we should. ReadFromHardware/WriteFromHardware,
-	// fastmem, the JIT cache, and some misc code in the JIT assume default BATs.
-	if (SConfig::GetInstance().m_LocalCoreStartupParameter.bBAT)
-	{
-		u32 tlb_addr = TranslateBlockAddress(address, flag);
-		if (tlb_addr)
-			return tlb_addr;
-	}
+	// TODO: Perform BAT translation.  (At the moment, we hardcode an assumed BAT
+	// configuration, so there's no reason to actually check the registers.)
 	return TranslatePageAddress(address, flag);
 }