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/*++
*
* WOW v1.0
*
* Copyright (c) 1992, Microsoft Corporation
*
* WKMEM.C
* WOW32 KRNL386 Virtual Memory Management Functions
*
* History:
* Created 3-Dec-1992 by Matt Felton (mattfe)
*
--*/
#include "precomp.h"
#pragma hdrstop
#include "memapi.h"
MODNAME(wkman.c);
LPVOID FASTCALL WK32VirtualAlloc(PVDMFRAME pFrame)
{
PVIRTUALALLOC16 parg16;
LPVOID lpBaseAddress;
#ifndef i386
NTSTATUS Status;
#endif
GETARGPTR(pFrame, sizeof(VIRTUALALLOC16), parg16);
#ifndef i386
Status = VdmAllocateVirtualMemory((PULONG)&lpBaseAddress,
parg16->cbSize,
TRUE);
if (!NT_SUCCESS(Status)) {
if (Status == STATUS_NOT_IMPLEMENTED) {
#endif // i386
lpBaseAddress = VirtualAlloc((LPVOID)parg16->lpvAddress,
parg16->cbSize,
parg16->fdwAllocationType,
parg16->fdwProtect);
#ifndef i386
} else {
lpBaseAddress = NULL;
}
}
#endif // i386
#ifdef i386
//BUGBUG we need to either get this working on the new emulator, or
// fix the problem the "other" way, by letting the app fault and
// zap in just enough 'WOW's to avoid the problem.
if (lpBaseAddress) {
// Virtual alloc Zero's the allocated memory. We un-zero it by
// filling in with ' WOW'. This is required for Lotus Improv.
// When no printer is installed, Lotus Improv dies with divide
// by zero error (while opening the expenses.imp file) because
// it doesn't initialize a relevant portion of its data area.
//
// So we decided that this a convenient place to initialize
// the memory to a non-zero value.
// - Nanduri
//
// Dbase 5.0 for windows erroneously loops through (past its valid
// data) its data buffer till it finds a '\0' at some location -
// Most of the time the loop terminates before it reaches the segment
// limit. However if the block that was allocated is a 'fresh' block' ie
// the block is filled with ' WOW' it never finds a NULL in the buffer
// and thus loops past the segment limit to its death
//
// So we initialize the buffer with '\0WOW' instead of ' WOW'.
// - Nanduri
WOW32ASSERT((parg16->cbSize % 4) == 0); // DWORD aligned?
RtlFillMemoryUlong(lpBaseAddress, parg16->cbSize, (ULONG)'\0WOW');
}
#endif
FREEARGPTR(parg16);
return (lpBaseAddress);
}
BOOL FASTCALL WK32VirtualFree(PVDMFRAME pFrame)
{
PVIRTUALFREE16 parg16;
BOOL fResult;
#ifndef i386
NTSTATUS Status;
#endif
GETARGPTR(pFrame, sizeof(VIRTUALFREE16), parg16);
#ifndef i386
Status = VdmFreeVirtualMemory((ULONG)parg16->lpvAddress);
fResult = NT_SUCCESS(Status);
if (Status == STATUS_NOT_IMPLEMENTED) {
#endif // i386
fResult = VirtualFree((LPVOID)parg16->lpvAddress,
parg16->cbSize,
parg16->fdwFreeType);
#ifndef i386
}
#endif // i386
FREEARGPTR(parg16);
return (fResult);
}
#if 0
BOOL FASTCALL WK32VirtualLock(PVDMFRAME pFrame)
{
PVIRTUALLOCK16 parg16;
BOOL fResult;
WOW32ASSERT(FALSE); //BUGBUG we don't appear to ever use this function
GETARGPTR(pFrame, sizeof(VIRTUALLOCK16), parg16);
fResult = VirtualLock((LPVOID)parg16->lpvAddress,
parg16->cbSize);
FREEARGPTR(parg16);
return (fResult);
}
BOOL FASTCALL WK32VirtualUnLock(PVDMFRAME pFrame)
{
PVIRTUALUNLOCK16 parg16;
BOOL fResult;
WOW32ASSERT(FALSE); //BUGBUG we don't appear to ever use this function
GETARGPTR(pFrame, sizeof(VIRTUALUNLOCK16), parg16);
fResult = VirtualUnlock((LPVOID)parg16->lpvAddress,
parg16->cbSize);
FREEARGPTR(parg16);
return (fResult);
}
#endif
VOID FASTCALL WK32GlobalMemoryStatus(PVDMFRAME pFrame)
{
PGLOBALMEMORYSTATUS16 parg16;
LPMEMORYSTATUS pMemStat;
GETARGPTR(pFrame, sizeof(GLOBALMEMORYSTATUS16), parg16);
GETVDMPTR(parg16->lpmstMemStat, 32, pMemStat);
GlobalMemoryStatus(pMemStat);
FREEVDMPTR(pMemStat);
FREEARGPTR(parg16);
}
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