Fix time in some games (AC and ZWW at least). Many games doesn't use RTC but TBRs. So a TB offset is initialized at boot with localtime now. There are, indeed, side effects since time is CPU cycle dependent in this case.

git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@1519 8ced0084-cf51-0410-be5f-012b33b47a6e

Source/Core/Common/Src/Timer.cpp

@@ -96,4 +96,17 @@ u64 Timer::GetTimeSinceJan1970(void)
 	time(&ltime);
 	return((u64)ltime);
 }
+
+u64 Timer::GetLocalTimeSinceJan1970(void)
+{
+	time_t sysTime, tzDiff;
+	struct tm * gmTime;
+
+	time(&sysTime);
+	// Lazy way to get local time in sec
+	gmTime	= gmtime(&sysTime);
+	tzDiff = sysTime - mktime(gmTime);
+
+	return (u64)(sysTime + tzDiff);
+}
 } // end of namespace Common

Source/Core/Common/Src/Timer.h

@@ -37,6 +37,7 @@ class Timer
 		static void IncreaseResolution();
 		static void RestoreResolution();
 		static u64 GetTimeSinceJan1970();
+		static u64 GetLocalTimeSinceJan1970();
 
 
 	public:

Source/Core/Core/Src/Boot/Boot_BIOSEmu.cpp

@@ -161,13 +161,14 @@ void CBoot::EmulatedBIOS(bool _bDebug)
 
     // Bus Clock Speed
     Memory::Write_U32(0x09a7ec80, 0x800000F8);
+    // CPU Clock Speed
     Memory::Write_U32(0x1cf7c580, 0x800000FC);
 
     // fake the VI Init of the BIOS 
     Memory::Write_U32(Core::g_CoreStartupParameter.bNTSC ? 0 : 1, 0x800000CC);
 
-    // preset time
-    Memory::Write_U32(CEXIIPL::GetGCTime(), 0x800030D8);
+    // preset time base ticks
+	Memory::Write_U64( (u64)CEXIIPL::GetGCTime() * (u64)40500000, 0x800030D8);
 }
 
 

Source/Core/Core/Src/HW/EXI_DeviceIPL.cpp

@@ -266,6 +266,11 @@ void CEXIIPL::TransferByte(u8& _uByte)
 
 u32 CEXIIPL::GetGCTime()
 {
+    const u32 cJanuary2000 = 0x386D4380;  // Seconds between 1.1.1970 and 1.1.2000
+
+	// (mb2): I think we can get rid of the IPL bias.
+	// I know, it's another hack so I let the previous code for a while.
+#if 0
     // Get SRAM bias	
     u32 Bias;
 
@@ -275,8 +280,11 @@ u32 CEXIIPL::GetGCTime()
     }
 
     // Get the time ... 
-    const u32 cJanuary2000 = 0x386d35a1;  // Seconds between 1.1.1970 and 1.1.2000
     u64 ltime = Common::Timer::GetTimeSinceJan1970();
     return ((u32)ltime - cJanuary2000 - Bias);
+#else
+	u64 ltime = Common::Timer::GetLocalTimeSinceJan1970();
+    return ((u32)ltime - cJanuary2000);
+#endif
 }
 

Source/Core/Core/Src/HW/SystemTimers.cpp

@@ -25,6 +25,7 @@
 #include "../HW/VideoInterface.h"
 #include "../HW/SerialInterface.h"
 #include "../HW/CommandProcessor.h" // for DC watchdog hack
+#include "../HW/EXI_DeviceIPL.h"
 #include "../PowerPC/PowerPC.h"
 #include "../CoreTiming.h"
 #include "../Core.h"
@@ -38,6 +39,7 @@ namespace SystemTimers
 u32 CPU_CORE_CLOCK  = 486000000u;             // 486 mhz (its not 485, stop bugging me!)
 
 s64 fakeDec;
+u64 startTimeBaseTicks;
 
 // ratio of TB and Decrementer to clock cycles
 // With TB clk at 1/4 of BUS clk
@@ -160,7 +162,7 @@ void AdvanceCallback(int cyclesExecuted)
 {
 	fakeDec -= cyclesExecuted;
 	u64 timebase_ticks = CoreTiming::GetTicks() / TIMER_RATIO; //works since we are little endian and TL comes first :)
-	*(u64*)&TL = timebase_ticks;
+	*(u64*)&TL = timebase_ticks + startTimeBaseTicks;
  	if (fakeDec >= 0)
 		PowerPC::ppcState.spr[SPR_DEC] = (u32)fakeDec / TIMER_RATIO;
 }
@@ -198,6 +200,8 @@ void Init()
 		DSP_PERIOD = (int)(GetTicksPerSecond() * 0.005f);
 	}
 	Common::Timer::IncreaseResolution();
+	// store and convert localtime at boot to timebase ticks
+	startTimeBaseTicks = (u64)(CPU_CORE_CLOCK / TIMER_RATIO) * (u64)CEXIIPL::GetGCTime();
 
 	et_Dec = CoreTiming::RegisterEvent("DecCallback", DecrementerCallback);
 	et_AI = CoreTiming::RegisterEvent("AICallback", AICallback);