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/* -*- mode: C++; tab-width: 4 -*- */
/* ===================================================================== *\
Copyright (c) 2000-2001 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 "EmLowMem.h"
#include "EmMemory.h" // CEnableFullAccess
#include "EmPalmFunction.h" // SysTrapIndex
#include "EmPatchState.h" // EmPatchState::OSMajorVersion
#include "PalmPack.h"
#define NON_PORTABLE
#include "SysEvtPrv.h" // SysEvtMgrGlobalsType
#undef NON_PORTABLE
#include "PalmPackPop.h"
EmAliasLowMemHdrType<PAS> EmLowMem::fgLowMem (EmMemNULL);
#pragma mark -
// ===========================================================================
// ¥ EmLowMem
// ===========================================================================
static uint16 gSysDispatchTableSize;
/***********************************************************************
*
* FUNCTION: EmLowMem::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 EmLowMem::Initialize (void)
{
gSysDispatchTableSize = 0;
}
/***********************************************************************
*
* FUNCTION: EmLowMem::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 EmLowMem::Reset (void)
{
}
/***********************************************************************
*
* FUNCTION: EmLowMem::Save
*
* DESCRIPTION: Standard save function. Saves any sub-system state to
* the given session file.
*
* PARAMETERS: None.
*
* RETURNED: Nothing.
*
***********************************************************************/
void EmLowMem::Save (SessionFile&)
{
}
/***********************************************************************
*
* FUNCTION: EmLowMem::Load
*
* DESCRIPTION: Standard load function. Loads any sub-system state
* from the given session file.
*
* PARAMETERS: None.
*
* RETURNED: Nothing.
*
***********************************************************************/
void EmLowMem::Load (SessionFile&)
{
}
/***********************************************************************
*
* FUNCTION: EmLowMem::Dispose
*
* DESCRIPTION: Standard dispose function. Completely release any
* resources acquired or allocated in Initialize and/or
* Load.
*
* PARAMETERS: None.
*
* RETURNED: Nothing.
*
***********************************************************************/
void EmLowMem::Dispose (void)
{
}
/***********************************************************************
*
* FUNCTION: EmLowMem::GetEvtMgrIdle
*
* DESCRIPTION: .
*
* PARAMETERS: None.
*
* RETURNED: Nothing.
*
***********************************************************************/
uint8 EmLowMem::GetEvtMgrIdle (void)
{
CEnableFullAccess munge; // Remove blocks on memory access.
// First, get sysEvtMgrGlobalsP, which is a pointer in low-memory.
emuptr sysEvtMgrGlobalsP = EmLowMem_GetGlobal (sysEvtMgrGlobalsP);
/*
** Next look at the "idle" boolean in the SysEvtMgrGlobalsPtr
** contained in sysEvtMgrGlobalsP:
**
** struct SysEvtMgrGlobalsType
** {
** ...
** Boolean idle;
** ...
** };
*/
size_t idleOffset = offsetof (SysEvtMgrGlobalsType, idle);
// Under Palm OS 1.0, there was an extra 4-byte value at the
// location currently holding "gremlinsFlag", which is before
// the "idle" field. Under that version of the OS, we therefore
// have to add 4 to get the right offset.
if (EmPatchState::OSMajorVersion () == 1)
{
idleOffset += sizeof (Int32);
}
uint8 idle = EmMemGet8 (sysEvtMgrGlobalsP + idleOffset);
return idle;
}
/***********************************************************************
*
* FUNCTION: EmLowMem::TrapExists
*
* DESCRIPTION: .
*
* PARAMETERS: None.
*
* RETURNED: Nothing.
*
***********************************************************************/
Bool EmLowMem::TrapExists (uint16 iATrap)
{
#if 0
// No longer cache the dispatch table size. Handspring changes the
// size of the dispatch table after the first system call, resulting
// in Poser caching the old table size, and thus complaining that
// some functions are not implemented when in fact they are.
// If we haven't already, get the number of traps in this system.
if (gSysDispatchTableSize == 0)
{
CEnableFullAccess munge; // Remove blocks on memory access.
gSysDispatchTableSize = EmLowMem_GetGlobal (sysDispatchTableSize);
}
return (::SysTrapIndex (iATrap) == ::SysTrapIndex (sysTrapHostControl)) ||
::SysTrapIndex (iATrap) < gSysDispatchTableSize;
#else
CEnableFullAccess munge; // Remove blocks on memory access.
uint16 sysDispatchTableSize = EmLowMem_GetGlobal (sysDispatchTableSize);
return (::SysTrapIndex (iATrap) == ::SysTrapIndex (sysTrapHostControl)) ||
::SysTrapIndex (iATrap) < sysDispatchTableSize;
#endif
}
/***********************************************************************
*
* FUNCTION: EmLowMem::GetTrapAddress
*
* DESCRIPTION: .
*
* PARAMETERS: None.
*
* RETURNED: Nothing.
*
***********************************************************************/
emuptr EmLowMem::GetTrapAddress (uint16 iATrap)
{
emuptr address = EmMemNULL;
CEnableFullAccess munge; // Remove blocks on memory access.
// If the trap number is not in range, just return NULL to signal
// that normal process of the TRAP $F should occur.
// uint16 sysDispatchTableSize = EmLowMem_GetGlobal (sysDispatchTableSize);
uint16 sysDispatchTableSize = EmMemGet16 (256 + 62);
iATrap = ::SysTrapIndex (iATrap);
if ((iATrap == ::SysTrapIndex (sysTrapHostControl)) ||
(iATrap < sysDispatchTableSize))
{
// Get sysDispatchTableP, which is a pointer in low-memory.
// uint32 sysDispatchTableP = EmLowMem_GetGlobal (sysDispatchTableP);
uint32 sysDispatchTableP = EmMemGet32 (256 + 34);
// If it's NULL, return NULL.
if (sysDispatchTableP != EmMemNULL)
{
// Next, get the right guy from its contents.
address = EmMemGet32 (sysDispatchTableP + iATrap * 4);
}
}
return address;
}
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