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/* -*- mode: C++; tab-width: 4 -*- */
/* ================================================================================== */
/* Copyright (c) 1998-1999 3Com Corporation or its subsidiaries. All rights reserved. */
/* ================================================================================== */
#include "EmulatorCommon.h"
#include "Bank_MC68681.h"
#include "CPU_REG.h" // Software::BusError
#include "RAM_ROM.h" // Memory::InitializeBanks
// ===========================================================================
// MC68681 Bank Accessors
// ===========================================================================
// These functions provide fetch and store access to the emulated M68681
// serial port.
static AddressBank gAddressBank =
{
MC68681Bank::GetLong,
MC68681Bank::GetWord,
MC68681Bank::GetByte,
MC68681Bank::SetLong,
MC68681Bank::SetWord,
MC68681Bank::SetByte,
MC68681Bank::GetRealAddress,
MC68681Bank::ValidAddress,
NULL,
NULL
};
static const uae_u32 kMemoryStart = hwrDuartBase;
static HwrDuartType gDuart;
/***********************************************************************
*
* FUNCTION: MC68681Bank::Initialize
*
* DESCRIPTION: Standard initialization function. Responsible for
* initializing this sub-system when a new session is
* created. May also be called from the Load function
* to share common functionality.
*
* PARAMETERS: None.
*
* RETURNED: Nothing.
*
***********************************************************************/
void MC68681Bank::Initialize (void)
{
// Memory bank 0x10E0 is managed by the functions in MC68681Bank.
Memory::InitializeBanks ( gAddressBank,
bankindex (kMemoryStart), 1);
}
/***********************************************************************
*
* FUNCTION: MC68681Bank::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 MC68681Bank::Reset (void)
{
}
/***********************************************************************
*
* FUNCTION: MC68681Bank::Save
*
* DESCRIPTION: Standard save function. Saves any sub-system state to
* the given session file.
*
* PARAMETERS: None.
*
* RETURNED: Nothing.
*
***********************************************************************/
void MC68681Bank::Save (SessionFile&)
{
}
/***********************************************************************
*
* FUNCTION: MC68681Bank::Load
*
* DESCRIPTION: Standard load function. Loads any sub-system state
* from the given session file.
*
* PARAMETERS: None.
*
* RETURNED: Nothing.
*
***********************************************************************/
void MC68681Bank::Load (SessionFile&)
{
}
/***********************************************************************
*
* FUNCTION: MC68681Bank::Dispose
*
* DESCRIPTION: Standard dispose function. Completely release any
* resources acquired or allocated in Initialize and/or
* Load.
*
* PARAMETERS: None.
*
* RETURNED: Nothing.
*
***********************************************************************/
void MC68681Bank::Dispose (void)
{
}
// ---------------------------------------------------------------------------
// MC68681Bank::GetLong
// ---------------------------------------------------------------------------
uae_u32 MC68681Bank::GetLong (uaecptr iAddress)
{
InvalidAccess (iAddress, 4, true);
return 0;
}
// ---------------------------------------------------------------------------
// MC68681Bank::GetWord
// ---------------------------------------------------------------------------
uae_u32 MC68681Bank::GetWord (uaecptr iAddress)
{
InvalidAccess (iAddress, 2, true);
return 0;
}
// ---------------------------------------------------------------------------
// MC68681Bank::GetByte
// ---------------------------------------------------------------------------
uae_u32 MC68681Bank::GetByte (uaecptr iAddress)
{
return ((uae_u8*) &gDuart)[iAddress - kMemoryStart];
}
// ---------------------------------------------------------------------------
// MC68681Bank::SetLong
// ---------------------------------------------------------------------------
void MC68681Bank::SetLong (uaecptr iAddress, uae_u32 iLongValue)
{
UNUSED_PARAM(iLongValue)
InvalidAccess (iAddress, 4, false);
}
// ---------------------------------------------------------------------------
// MC68681Bank::SetWord
// ---------------------------------------------------------------------------
void MC68681Bank::SetWord (uaecptr iAddress, uae_u32 iWordValue)
{
UNUSED_PARAM(iWordValue)
InvalidAccess (iAddress, 2, false);
}
// ---------------------------------------------------------------------------
// MC68681Bank::SetByte
// ---------------------------------------------------------------------------
void MC68681Bank::SetByte (uaecptr iAddress, uae_u32 iByteValue)
{
((uae_u8*) &gDuart)[iAddress - kMemoryStart] = iByteValue;
}
// ---------------------------------------------------------------------------
// MC68681Bank::ValidAddress
// ---------------------------------------------------------------------------
int MC68681Bank::ValidAddress (uaecptr iAddress, uae_u32 iSize)
{
UNUSED_PARAM(iSize)
const uaecptr offset = iAddress - kMemoryStart;
int result = (offset >= 0) && (offset < sizeof (gDuart));
assert (result);
return result;
}
// ---------------------------------------------------------------------------
// MC68681Bank::GetRealAddress
// ---------------------------------------------------------------------------
uae_u8* MC68681Bank::GetRealAddress (uaecptr iAddress)
{
return &(((uae_u8*) &gDuart)[iAddress - kMemoryStart]);
}
// ---------------------------------------------------------------------------
// MC68681Bank::InvalidAccess
// ---------------------------------------------------------------------------
void MC68681Bank::InvalidAccess (uaecptr iAddress, long size, Bool forRead)
{
UNUSED_PARAM(iAddress)
UNUSED_PARAM(size)
UNUSED_PARAM(forRead)
Software::BusError ();
}
// ---------------------------------------------------------------------------
// MC68681Bank::PreventedAccess
// ---------------------------------------------------------------------------
void MC68681Bank::PreventedAccess (uaecptr iAddress, long size, Bool forRead)
{
UNUSED_PARAM(iAddress)
UNUSED_PARAM(size)
UNUSED_PARAM(forRead)
Software::BusError ();
}
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