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Diffstat (limited to 'SrcShared/Hardware/EmBankDummy.cpp')
| -rw-r--r-- | SrcShared/Hardware/EmBankDummy.cpp | 326 |
1 files changed, 326 insertions, 0 deletions
diff --git a/SrcShared/Hardware/EmBankDummy.cpp b/SrcShared/Hardware/EmBankDummy.cpp new file mode 100644 index 0000000..356b542 --- /dev/null +++ b/SrcShared/Hardware/EmBankDummy.cpp @@ -0,0 +1,326 @@ +/* -*- mode: C++; tab-width: 4 -*- */ +/* ===================================================================== *\ + Copyright (c) 1998-2001 Palm, Inc. or its subsidiaries. + All rights reserved. + + This file is part of the Palm OS Emulator. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. +\* ===================================================================== */ + +#include "EmCommon.h" +#include "EmBankDummy.h" + +#include "EmBankDRAM.h" // EmBankDRAM::ValidAddress +#include "EmBankSRAM.h" // EmBankSRAM::GetMemoryStart +#include "EmCPU68K.h" // gCPU68K +#include "EmPalmHeap.h" // EmPalmHeap::GetHeapByPtr +#include "EmMemory.h" // Memory::InitializeBanks + + +// =========================================================================== +// ¥ Dummy Bank Accessors +// =========================================================================== +// Dummy banks are non-existent blocks of memory. Dummy bank accessors do +// not do anything. + +static EmAddressBank gAddressBank = +{ + EmBankDummy::GetLong, + EmBankDummy::GetWord, + EmBankDummy::GetByte, + EmBankDummy::SetLong, + EmBankDummy::SetWord, + EmBankDummy::SetByte, + EmBankDummy::GetRealAddress, + EmBankDummy::ValidAddress, + EmBankDummy::GetMetaAddress, + EmBankDummy::AddOpcodeCycles +}; + + +inline Bool HackForHwrGetRAMSize (emuptr address) +{ +// if ((address & 0xFF000000) == EmBankSRAM::GetMemoryStart ()) + if (address == EmBankSRAM::GetMemoryStart () + gRAMBank_Size) + return true; + + return false; +} + + +/*********************************************************************** + * + * FUNCTION: EmBankDummy::Initialize + * + * DESCRIPTION: Standard initialization function. Responsible for + * initializing this sub-system when a new session is + * created. Will be followed by at least one call to + * Reset or Load. + * + * PARAMETERS: None. + * + * RETURNED: Nothing. + * + ***********************************************************************/ + +void EmBankDummy::Initialize (void) +{ +} + + +/*********************************************************************** + * + * FUNCTION: EmBankDummy::Reset + * + * DESCRIPTION: Standard reset function. Sets the sub-system to a + * default state. This occurs not only on a Reset (as + * from the menu item), but also when the sub-system + * is first initialized (Reset is called after Initialize) + * as well as when the system is re-loaded from an + * insufficient session file. + * + * PARAMETERS: None. + * + * RETURNED: Nothing. + * + ***********************************************************************/ + +void EmBankDummy::Reset (Bool /*hardwareReset*/) +{ +} + + +/*********************************************************************** + * + * FUNCTION: EmBankDummy::Save + * + * DESCRIPTION: Standard save function. Saves any sub-system state to + * the given session file. + * + * PARAMETERS: None. + * + * RETURNED: Nothing. + * + ***********************************************************************/ + +void EmBankDummy::Save (SessionFile&) +{ +} + + +/*********************************************************************** + * + * FUNCTION: EmBankDummy::Load + * + * DESCRIPTION: Standard load function. Loads any sub-system state + * from the given session file. + * + * PARAMETERS: None. + * + * RETURNED: Nothing. + * + ***********************************************************************/ + +void EmBankDummy::Load (SessionFile&) +{ +} + + +/*********************************************************************** + * + * FUNCTION: EmBankDummy::Dispose + * + * DESCRIPTION: Standard dispose function. Completely release any + * resources acquired or allocated in Initialize and/or + * Load. + * + * PARAMETERS: None. + * + * RETURNED: Nothing. + * + ***********************************************************************/ + +void EmBankDummy::Dispose (void) +{ +} + + +/*********************************************************************** + * + * FUNCTION: EmBankDummy::SetBankHandlers + * + * DESCRIPTION: Set the bank handlers UAE uses to dispatch memory + * access operations. + * + * PARAMETERS: None + * + * RETURNED: Nothing + * + ***********************************************************************/ + +void EmBankDummy::SetBankHandlers (void) +{ + Memory::InitializeBanks (gAddressBank, 0, 0xFFFF); +} + + +// --------------------------------------------------------------------------- +// ¥ EmBankDummy::GetLong +// --------------------------------------------------------------------------- + +uint32 EmBankDummy::GetLong (emuptr address) +{ + // Hack to keep HwrGetRAMSize working: it runs off + // the end of RAM while testing it. + + if (HackForHwrGetRAMSize (address)) + return 0; + + InvalidAccess (address, sizeof (uint32), true); + return ~0; +} + + +// --------------------------------------------------------------------------- +// ¥ EmBankDummy::GetWord +// --------------------------------------------------------------------------- + +uint32 EmBankDummy::GetWord (emuptr address) +{ + // Hack to keep HwrGetRAMSize working: it runs off + // the end of RAM while testing it. + + if (HackForHwrGetRAMSize (address)) + return 0; + + InvalidAccess (address, sizeof (uint16), true); + return ~0; +} + + +// --------------------------------------------------------------------------- +// ¥ EmBankDummy::GetByte +// --------------------------------------------------------------------------- + +uint32 EmBankDummy::GetByte (emuptr address) +{ + // Hack to keep HwrGetRAMSize working: it runs off + // the end of RAM while testing it. + + if (HackForHwrGetRAMSize (address)) + return 0; + + InvalidAccess (address, sizeof (uint8), true); + return ~0; +} + + +// --------------------------------------------------------------------------- +// ¥ EmBankDummy::SetLong +// --------------------------------------------------------------------------- + +void EmBankDummy::SetLong (emuptr address, uint32) +{ + // Hack to keep HwrGetRAMSize working: it runs off + // the end of RAM while testing it. + + if (HackForHwrGetRAMSize (address)) + return; + + InvalidAccess (address, sizeof (uint32), true); +} + + +// --------------------------------------------------------------------------- +// ¥ EmBankDummy::SetWord +// --------------------------------------------------------------------------- + +void EmBankDummy::SetWord (emuptr address, uint32) +{ + // Hack to keep HwrGetRAMSize working: it runs off + // the end of RAM while testing it. + + if (HackForHwrGetRAMSize (address)) + return; + + InvalidAccess (address, sizeof (uint16), true); +} + + +// --------------------------------------------------------------------------- +// ¥ EmBankDummy::SetByte +// --------------------------------------------------------------------------- + +void EmBankDummy::SetByte (emuptr address, uint32) +{ + // Hack to keep HwrGetRAMSize working: it runs off + // the end of RAM while testing it. + + if (HackForHwrGetRAMSize (address)) + return; + + InvalidAccess (address, sizeof (uint8), true); +} + + +// --------------------------------------------------------------------------- +// ¥ EmBankDummy::ValidAddress +// --------------------------------------------------------------------------- + +int EmBankDummy::ValidAddress (emuptr, uint32) +{ + int result = false; + + return result; +} + + +// --------------------------------------------------------------------------- +// ¥ EmBankDummy::GetRealAddress +// --------------------------------------------------------------------------- + +uint8* EmBankDummy::GetRealAddress (emuptr address) +{ + return (uint8*) address; +} + + +// --------------------------------------------------------------------------- +// ¥ EmBankDummy::GetMetaAddress +// --------------------------------------------------------------------------- + +uint8* EmBankDummy::GetMetaAddress (emuptr address) +{ + UNUSED_PARAM(address) + + static uint8 dummyBits[4] = {0, 0, 0, 0}; + + return dummyBits; +} + + +// --------------------------------------------------------------------------- +// ¥ EmBankDummy::AddOpcodeCycles +// --------------------------------------------------------------------------- + +void EmBankDummy::AddOpcodeCycles (void) +{ +} + + +// --------------------------------------------------------------------------- +// ¥ EmBankDummy::InvalidAccess +// --------------------------------------------------------------------------- + +void EmBankDummy::InvalidAccess (emuptr address, long size, Bool forRead) +{ + if (CEnableFullAccess::AccessOK ()) + return; + + EmAssert (gCPU68K); + gCPU68K->BusError (address, size, forRead); +} |