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MB/Phasor: Wrap 6522.IFR changes inside a critical section to avoid a potential 2 thread data-race

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This commit is contained in:
tomcw 2017-10-28 18:39:45 +01:00
parent 74ac2a4f22
commit e2b515de33
1 changed files with 45 additions and 83 deletions
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128
source/Mockingboard.cpp
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@ -207,6 +207,9 @@ static DWORD g_dwMaxPhonemeLen = 0;
// When 6522 IRQ is *not* active use 60Hz update freq for MB voices
static const double g_f6522TimerPeriod_NoIRQ = CLK_6502 / 60.0; // Constant whatever the CLK is set to
static bool g_bCritSectionValid = false; // Deleting CritialSection when not valid causes crash on Win98
static CRITICAL_SECTION g_CriticalSection; // To guard 6522's IFR
//---------------------------------------------------------------------------
// Forward refs:
@ -329,15 +332,22 @@ static void AY8910_Write(BYTE nDevice, BYTE nReg, BYTE nValue, BYTE nAYDevice)
}
}
// TODO: Fix data-race: main thread & SSI263Thread accessing IFR
// . extend this func to take an or_mask & and_mask
// . then do the mods inside a critical section
static void UpdateIFR(SY6522_AY8910* pMB)
static void UpdateIFR(SY6522_AY8910* pMB, BYTE clr_ifr, BYTE set_ifr=0)
{
pMB->sy6522.IFR &= 0x7F;
// Need critical section to avoid data-race: main thread & SSI263Thread can both access IFR
// . NB. Loading a save-state just directly writes into 6522.IFR (which is fine)
_ASSERT(g_bCritSectionValid);
if (g_bCritSectionValid) EnterCriticalSection(&g_CriticalSection);
{
pMB->sy6522.IFR &= ~clr_ifr;
pMB->sy6522.IFR |= set_ifr;
if (pMB->sy6522.IFR & pMB->sy6522.IER & 0x7F)
pMB->sy6522.IFR |= 0x80;
if (pMB->sy6522.IFR & pMB->sy6522.IER & 0x7F)
pMB->sy6522.IFR |= 0x80;
else
pMB->sy6522.IFR &= 0x7F;
}
if (g_bCritSectionValid) LeaveCriticalSection(&g_CriticalSection);
// Now update the IRQ signal from all 6522s
// . OR-sum of all active TIMER1, TIMER2 & SPEECH sources (from all 6522s)
@ -352,13 +362,9 @@ static void UpdateIFR(SY6522_AY8910* pMB)
// . I assume Phasor's 6522s just generate 6502 IRQs (not NMIs)
if (bIRQ)
{
CpuIrqAssert(IS_6522);
}
else
{
CpuIrqDeassert(IS_6522);
}
}
static void SY6522_Write(BYTE nDevice, BYTE nReg, BYTE nValue)
@ -415,8 +421,7 @@ static void SY6522_Write(BYTE nDevice, BYTE nReg, BYTE nValue)
/* Initiates timer1 & clears time-out of timer1 */
// Clear Timer Interrupt Flag.
pMB->sy6522.IFR &= ~IxR_TIMER1;
UpdateIFR(pMB);
UpdateIFR(pMB, IxR_TIMER1);
pMB->sy6522.TIMER1_LATCH.h = nValue;
pMB->sy6522.TIMER1_COUNTER.w = pMB->sy6522.TIMER1_LATCH.w;
@ -425,17 +430,15 @@ static void SY6522_Write(BYTE nDevice, BYTE nReg, BYTE nValue)
break;
case 0x07: // TIMER1H_LATCH
// Clear Timer1 Interrupt Flag.
UpdateIFR(pMB, IxR_TIMER1);
pMB->sy6522.TIMER1_LATCH.h = nValue;
pMB->sy6522.IFR &= ~IxR_TIMER1;
UpdateIFR(pMB);
break;
case 0x08: // TIMER2L
pMB->sy6522.TIMER2_LATCH.l = nValue;
break;
case 0x09: // TIMER2H
// Clear Timer2 Interrupt Flag.
pMB->sy6522.IFR &= ~IxR_TIMER2;
UpdateIFR(pMB);
UpdateIFR(pMB, IxR_TIMER2);
pMB->sy6522.TIMER2_LATCH.h = nValue;
pMB->sy6522.TIMER2_COUNTER.w = pMB->sy6522.TIMER2_LATCH.w;
@ -453,10 +456,7 @@ static void SY6522_Write(BYTE nDevice, BYTE nReg, BYTE nValue)
case 0x0d: // IFR
// - Clear those bits which are set in the lower 7 bits.
// - Can't clear bit 7 directly.
nValue |= 0x80; // Set high bit
nValue ^= 0x7F; // Make mask
pMB->sy6522.IFR &= nValue;
UpdateIFR(pMB);
UpdateIFR(pMB, nValue);
break;
case 0x0e: // IER
if(!(nValue & 0x80))
@ -464,7 +464,7 @@ static void SY6522_Write(BYTE nDevice, BYTE nReg, BYTE nValue)
// Clear those bits which are set in the lower 7 bits.
nValue ^= 0x7F;
pMB->sy6522.IER &= nValue;
UpdateIFR(pMB);
UpdateIFR(pMB, 0);
// Check if active timer has been disabled:
if (((pMB->sy6522.IER & IxR_TIMER1) == 0) && pMB->bTimer1Active)
@ -478,7 +478,7 @@ static void SY6522_Write(BYTE nDevice, BYTE nReg, BYTE nValue)
// Set those bits which are set in the lower 7 bits.
nValue &= 0x7F;
pMB->sy6522.IER |= nValue;
UpdateIFR(pMB);
UpdateIFR(pMB, 0);
// Check if active timer changed from non-interrupt (polling IFR) to interrupt:
if ((pMB->sy6522.IER & IxR_TIMER1) && pMB->bTimer1Active)
@ -519,8 +519,7 @@ static BYTE SY6522_Read(BYTE nDevice, BYTE nReg)
break;
case 0x04: // TIMER1L_COUNTER
nValue = pMB->sy6522.TIMER1_COUNTER.l;
pMB->sy6522.IFR &= ~IxR_TIMER1; // Also clears Timer1 Interrupt Flag
UpdateIFR(pMB);
UpdateIFR(pMB, IxR_TIMER1);
break;
case 0x05: // TIMER1H_COUNTER
nValue = pMB->sy6522.TIMER1_COUNTER.h;
@ -533,8 +532,7 @@ static BYTE SY6522_Read(BYTE nDevice, BYTE nReg)
break;
case 0x08: // TIMER2L
nValue = pMB->sy6522.TIMER2_COUNTER.l;
pMB->sy6522.IFR &= ~IxR_TIMER2; // Also clears Timer2 Interrupt Flag
UpdateIFR(pMB);
UpdateIFR(pMB, IxR_TIMER2);
break;
case 0x09: // TIMER2H
nValue = pMB->sy6522.TIMER2_COUNTER.h;
@ -627,8 +625,7 @@ static void SSI263_Write(BYTE nDevice, BYTE nReg, BYTE nValue)
}
else
{
pMB->sy6522.IFR &= ~IxR_PERIPHERAL;
UpdateIFR(pMB);
UpdateIFR(pMB, IxR_PERIPHERAL);
}
pMB->SpeechChip.CurrentMode &= ~1; // Clear SSI263's D7 pin
@ -757,8 +754,7 @@ static void Votrax_Write(BYTE nDevice, BYTE nValue)
// !A/R: Acknowledge receipt of phoneme data (signal goes from high to low)
SY6522_AY8910* pMB = &g_MB[nDevice];
pMB->sy6522.IFR &= ~IxR_VOTRAX;
UpdateIFR(pMB);
UpdateIFR(pMB, IxR_VOTRAX);
g_nSSI263Device = nDevice;
@ -1008,8 +1004,7 @@ static DWORD WINAPI SSI263Thread(LPVOID lpParameter)
{
if((pMB->SpeechChip.CurrentMode != MODE_IRQ_DISABLED) && (pMB->sy6522.PCR == 0x0C))
{
pMB->sy6522.IFR |= IxR_PERIPHERAL;
UpdateIFR(pMB);
UpdateIFR(pMB, 0, IxR_PERIPHERAL);
pMB->SpeechChip.CurrentMode |= 1; // Set SSI263's D7 pin
}
}
@ -1020,8 +1015,7 @@ static DWORD WINAPI SSI263Thread(LPVOID lpParameter)
{
// !A/R: Time-out of old phoneme (signal goes from low to high)
pMB->sy6522.IFR |= IxR_VOTRAX;
UpdateIFR(pMB);
UpdateIFR(pMB, 0, IxR_VOTRAX);
g_bVotraxPhoneme = false;
}
@ -1410,6 +1404,9 @@ void MB_Initialize()
MB_Reset();
LogFileOutput("MB_Initialize: MB_Reset()\n");
}
InitializeCriticalSection(&g_CriticalSection);
g_bCritSectionValid = true;
}
//-----------------------------------------------------------------------------
@ -1427,8 +1424,14 @@ void MB_Destroy()
{
MB_DSUninit();
for(int i=0; i<NUM_VOICES; i++)
for (int i=0; i<NUM_VOICES; i++)
delete [] ppAYVoiceBuffer[i];
if (g_bCritSectionValid)
{
DeleteCriticalSection(&g_CriticalSection);
g_bCritSectionValid = false;
}
}
//-----------------------------------------------------------------------------
@ -1724,15 +1727,13 @@ void MB_UpdateCycles(ULONG uExecutedCycles)
{
// Fix for Willy Byte - need to confirm that 6522 really does this!
// . It never accesses IER/IFR/TIMER1 regs to clear IRQ
pMB->sy6522.IFR &= ~IxR_TIMER1; // Deassert the TIMER IRQ
UpdateIFR(pMB);
UpdateIFR(pMB, IxR_TIMER1); // Deassert the TIMER IRQ
}
}
if (pMB->bTimer1Active && bTimer1Underflow)
{
pMB->sy6522.IFR |= IxR_TIMER1;
UpdateIFR(pMB);
UpdateIFR(pMB, 0, IxR_TIMER1);
// Do MB_Update() before StopTimer1()
if (g_nMBTimerDevice == i)
@ -1755,8 +1756,7 @@ void MB_UpdateCycles(ULONG uExecutedCycles)
}
else if (pMB->bTimer2Active && bTimer2Underflow)
{
pMB->sy6522.IFR |= IxR_TIMER2;
UpdateIFR(pMB);
UpdateIFR(pMB, 0, IxR_TIMER2);
if((pMB->sy6522.ACR & RUNMODE) == RM_ONESHOT)
{
@ -1905,8 +1905,7 @@ int MB_SetSnapshot_v1(const SS_CARD_MOCKINGBOARD_v1* const pSS, const DWORD /*dw
if((pMB->SpeechChip.CurrentMode != MODE_IRQ_DISABLED) && (pMB->sy6522.PCR == 0x0C) && (pMB->sy6522.IER & IxR_PERIPHERAL))
{
pMB->sy6522.IFR |= IxR_PERIPHERAL;
UpdateIFR(pMB);
UpdateIFR(pMB, 0, IxR_PERIPHERAL);
pMB->SpeechChip.CurrentMode |= 1; // Set SSI263's D7 pin
}
}
@ -1920,41 +1919,6 @@ int MB_SetSnapshot_v1(const SS_CARD_MOCKINGBOARD_v1* const pSS, const DWORD /*dw
//===========================================================================
static UINT DoWriteFile(const HANDLE hFile, const void* const pData, const UINT Length)
{
DWORD dwBytesWritten;
BOOL bRes = WriteFile( hFile,
pData,
Length,
&dwBytesWritten,
NULL);
if(!bRes || (dwBytesWritten != Length))
{
//dwError = GetLastError();
throw std::string("Card: save error");
}
return dwBytesWritten;
}
static UINT DoReadFile(const HANDLE hFile, void* const pData, const UINT Length)
{
DWORD dwBytesRead;
BOOL bRes = ReadFile( hFile,
pData,
Length,
&dwBytesRead,
NULL);
if (dwBytesRead != Length)
throw std::string("Card: file corrupt");
return dwBytesRead;
}
//===========================================================================
// Unit version history:
// 2: Added: Timer1 & Timer2 active
// 3: Added: Unit state
@ -2177,8 +2141,7 @@ bool MB_LoadSnapshot(YamlLoadHelper& yamlLoadHelper, UINT slot, UINT version)
if((pMB->SpeechChip.CurrentMode != MODE_IRQ_DISABLED) && (pMB->sy6522.PCR == 0x0C) && (pMB->sy6522.IER & IxR_PERIPHERAL))
{
pMB->sy6522.IFR |= IxR_PERIPHERAL;
UpdateIFR(pMB);
UpdateIFR(pMB, 0, IxR_PERIPHERAL);
pMB->SpeechChip.CurrentMode |= 1; // Set SSI263's D7 pin
}
}
@ -2303,8 +2266,7 @@ bool Phasor_LoadSnapshot(YamlLoadHelper& yamlLoadHelper, UINT slot, UINT version
if((pMB->SpeechChip.CurrentMode != MODE_IRQ_DISABLED) && (pMB->sy6522.PCR == 0x0C) && (pMB->sy6522.IER & IxR_PERIPHERAL))
{
pMB->sy6522.IFR |= IxR_PERIPHERAL;
UpdateIFR(pMB);
UpdateIFR(pMB, 0, IxR_PERIPHERAL);
pMB->SpeechChip.CurrentMode |= 1; // Set SSI263's D7 pin
}
}