reactos/win32ss/reactx/dxg/ddhmg.c

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/*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS kernel
* PURPOSE: Native driver for dxg implementation
* FILE: win32ss/reactx/dxg/ddhmg.c
* PROGRAMER: Magnus olsen (magnus@greatlord.com)
* Sebastian Gasiorek (sebastian.gasiorek@reactos.org)
* REVISION HISTORY:
* 30/12-2007 Magnus Olsen
*/
#include <dxg_int.h>
/* The DdHmgr manger stuff */
ULONG gcSizeDdHmgr = 1024;
PDD_ENTRY gpentDdHmgr = NULL;
ULONG gcMaxDdHmgr = 0;
PDD_ENTRY gpentDdHmgrLast = NULL;
/* next free ddhmg handle number available to reuse */
ULONG ghFreeDdHmgr = 0;
HSEMAPHORE ghsemHmgr = NULL;
BOOL
FASTCALL
VerifyObjectOwner(PDD_ENTRY pEntry)
{
DWORD Pid = (DWORD)(DWORD_PTR)PsGetCurrentProcessId() & 0xFFFFFFFC;
DWORD check = (DWORD)pEntry->Pid & 0xFFFFFFFE;
return ( (check == Pid) || (!check));
}
/*++
* @name DdHmgCreate
* @implemented
*
* The function DdHmgCreate is used internally in dxg.sys
* It creates all DX kernel objects that are need it for creation of DX objects.
*
* @return
* Return FALSE for failure and TRUE for success in creating the DX object
*
* @remarks.
* Only used internally in dxg.sys
*--*/
BOOL
FASTCALL
DdHmgCreate(VOID)
{
gpentDdHmgr = EngAllocMem(FL_ZERO_MEMORY, gcSizeDdHmgr * sizeof(DD_ENTRY), TAG_THDD);
ghFreeDdHmgr = 0;
gcMaxDdHmgr = 1;
if (gpentDdHmgr)
{
ghsemHmgr = EngCreateSemaphore();
if (ghsemHmgr)
{
gpLockShortDelay = EngAllocMem(FL_ZERO_MEMORY | FL_NONPAGED_MEMORY, sizeof(LARGE_INTEGER), TAG_GINI);
if (gpLockShortDelay)
{
gpLockShortDelay->HighPart = -1;
return TRUE;
}
EngDeleteSemaphore(ghsemHmgr);
ghsemHmgr = NULL;
}
EngFreeMem(gpentDdHmgr);
gpentDdHmgr = NULL;
}
return FALSE;
}
/*++
* @name DdHmgDestroy
* @implemented
*
* The function DdHmgDestroy is used internally in dxg.sys
* It destroys all DX kernel objects
*
* @return
* Always returns true, as a failure here would result in a BSOD.
*
* @remarks.
* Only used internally in dxg.sys
*--*/
BOOL
FASTCALL
DdHmgDestroy(VOID)
{
gcMaxDdHmgr = 0;
gcSizeDdHmgr = 0;
ghFreeDdHmgr = 0;
gpentDdHmgrLast = NULL;
if (gpentDdHmgr)
{
EngFreeMem(gpentDdHmgr);
gpentDdHmgr = NULL;
}
if (ghsemHmgr)
{
EngDeleteSemaphore(ghsemHmgr);
ghsemHmgr = NULL;
}
return TRUE;
}
/*++
* @name DdHmgLock
* @implemented
*
* The function DdHmgLock is used internally in dxg.sys
* It locks a DX kernel object
*
* @param HANDLE DdHandle
* The handle we want locked
*
* @param UCHAR ObjectType
* The type of the object we expected the handle to contain
* value 0 is for ?
* value 1 is for EDD_DIRECTDRAW_LOCAL
* value 2 is for EDD_SURFACE
* value 3 is for ?
* value 4 is for EDD_VIDEOPORT
* value 5 is for EDD_MOTIONCOMP
* @param BOOLEAN LockOwned
* If it needs to call EngAcquireSemaphore or not
*
* @return
* Returns an EDD_* object, or NULL if it fails
*
* @remarks.
* Only used internally in dxg.sys
*--*/
PVOID
FASTCALL
DdHmgLock(HANDLE DdHandle, UCHAR ObjectType, BOOLEAN LockOwned)
{
DWORD Index = DDHMG_HTOI(DdHandle);
PDD_ENTRY pEntry = NULL;
PVOID Object = NULL;
if ( !LockOwned )
{
EngAcquireSemaphore(ghsemHmgr);
}
if ( Index < gcMaxDdHmgr )
{
pEntry = (PDD_ENTRY)((PBYTE)gpentDdHmgr + (sizeof(DD_ENTRY) * Index));
if ( VerifyObjectOwner(pEntry) )
{
if ( ( pEntry->Objt == ObjectType ) &&
( pEntry->FullUnique == (((ULONG)DdHandle >> 21) & 0x7FF) ) &&
( !pEntry->pobj->cExclusiveLock ) )
{
InterlockedIncrement((VOID*)&pEntry->pobj->cExclusiveLock);
pEntry->pobj->Tid = KeGetCurrentThread();
Object = pEntry->pobj;
}
}
}
if ( !LockOwned )
{
EngReleaseSemaphore(ghsemHmgr);
}
return Object;
}
/*++
* @name DdAllocateObject
* @implemented
*
* The function DdAllocateObject is used internally in dxg.sys
* It allocates memory for a DX kernel object
*
* @param UINT32 oSize
* Size of memory to be allocated
* @param UCHAR oType
* Object type
* @param BOOLEAN oZeroMemory
* Zero memory
*
* @remarks.
* Only used internally in dxg.sys
*/
PVOID
FASTCALL
DdAllocateObject(ULONG objSize, UCHAR objType, BOOLEAN objZeroMemory)
{
PVOID pObject = NULL;
if (objZeroMemory)
pObject = EngAllocMem(FL_ZERO_MEMORY, objSize, ((ULONG)objType << 24) + TAG_DH_0);
else
pObject = EngAllocMem(0, objSize, ((ULONG)objType << 24) + TAG_DH_0);
if (!pObject)
{
EngSetLastError(ERROR_NOT_ENOUGH_MEMORY);
}
return pObject;
}
/*++
* @name DdFreeObject
* @implemented
*
* The function DdFreeObject is used internally in dxg.sys
* It frees memory of DX kernel object
*
* @param PVOID pObject
* Object memory to be freed
*
* @remarks.
* Only used internally in dxg.sys
*/
VOID
FASTCALL
DdFreeObject(PVOID pObject)
{
EngFreeMem(pObject);
}
/*++
* @name DdGetFreeHandle
* @implemented
*
* The function DdGetFreeHandle is used internally in dxg.sys
* It allocates new handle for specified object type
*
* @param UCHAR oType
* Object type
*
* @return
* Returns handle or 0 if it fails.
*
* @remarks.
* Only used internally in dxg.sys
*--*/
HANDLE
FASTCALL
DdGetFreeHandle(UCHAR objType)
{
PVOID mAllocMem = NULL;
ULONG mAllocEntries = 0;
PDD_ENTRY pEntry = NULL;
ULONG retVal;
ULONG index;
// check if memory is allocated
if (!gpentDdHmgr)
return 0;
// check if we reached maximum handle index
if (gcMaxDdHmgr == DDHMG_HANDLE_LIMIT)
return 0;
// check if we have free handle to reuse
if (ghFreeDdHmgr)
{
index = ghFreeDdHmgr;
pEntry = (PDD_ENTRY)((PBYTE)gpentDdHmgr + (sizeof(DD_ENTRY) * index));
// put next free index to our global variable
ghFreeDdHmgr = pEntry->NextFree;
// build handle
pEntry->FullUnique = objType | 8;
retVal = (pEntry->FullUnique << 21) | index;
return (HANDLE)retVal;
}
// if all pre-allocated memory is already used then allocate more
if (gcSizeDdHmgr == gcMaxDdHmgr)
{
// allocate buffer for next 1024 handles
mAllocEntries = gcSizeDdHmgr + 1024;
mAllocMem = EngAllocMem(FL_ZERO_MEMORY, sizeof(DD_ENTRY) * (mAllocEntries), TAG_THDD);
if (!mAllocMem)
return 0;
memmove(&mAllocMem, gpentDdHmgr, sizeof(DD_ENTRY) * gcSizeDdHmgr);
gcSizeDdHmgr = mAllocEntries;
gpentDdHmgrLast = gpentDdHmgr;
EngFreeMem(gpentDdHmgr);
gpentDdHmgr = mAllocMem;
}
pEntry = (PDD_ENTRY)((PBYTE)gpentDdHmgr + (sizeof(DD_ENTRY) * gcMaxDdHmgr));
// build handle
pEntry->FullUnique = objType | 8;
retVal = (pEntry->FullUnique << 21) | gcMaxDdHmgr;
gcMaxDdHmgr = gcMaxDdHmgr + 1;
return (HANDLE)retVal;
}
/*++
* @name DdHmgAlloc
* @implemented
*
* The function DdHmgAlloc is used internally in dxg.sys
* It allocates object
*
* @param ULONG objSize
* Size of memory to be allocated
* @param CHAR objType
* Object type
* @param UINT objLock
* Object lock flag
*
* @return
* Handle if object is not locked by objLock
* Object if lock is set in objLock
* 0 if it fails.
*
* @remarks.
* Only used internally in dxg.sys
*--*/
HANDLE
FASTCALL
DdHmgAlloc(ULONG objSize, CHAR objType, BOOLEAN objLock)
{
PVOID pObject = NULL;
HANDLE DdHandle = NULL;
PDD_ENTRY pEntry = NULL;
DWORD Index;
pObject = DdAllocateObject(objSize, objType, TRUE);
if (!pObject)
return 0;
EngAcquireSemaphore(ghsemHmgr);
/* Get next free handle */
DdHandle = DdGetFreeHandle(objType);
if (DdHandle)
{
Index = DDHMG_HTOI(DdHandle);
pEntry = (PDD_ENTRY)((PBYTE)gpentDdHmgr + (sizeof(DD_ENTRY) * Index));
pEntry->pobj = pObject;
pEntry->Objt = objType;
pEntry->Pid = (HANDLE)(((ULONG)PsGetCurrentProcessId() & 0xFFFFFFFC) | ((ULONG)(pEntry->Pid) & 1));
if (objLock)
{
InterlockedIncrement((VOID*)&pEntry->pobj->cExclusiveLock);
pEntry->pobj->Tid = KeGetCurrentThread();
}
pEntry->pobj->hHmgr = DdHandle;
EngReleaseSemaphore(ghsemHmgr);
/* Return handle if object not locked */
if (!objLock)
return DdHandle;
return (HANDLE)pEntry;
}
EngReleaseSemaphore(ghsemHmgr);
DdFreeObject(pObject);
return 0;
}
/*++
* @name DdHmgFree
* @implemented
*
* The function DdHmgFree is used internally in dxg.sys
* It frees DX object and memory allocated to it
*
* @param HANDLE DdHandle
* DX object handle
*
* @remarks.
* Only used internally in dxg.sys
*--*/
VOID
FASTCALL
DdHmgFree(HANDLE DdHandle)
{
PDD_ENTRY pEntry = NULL;
DWORD Index = DDHMG_HTOI(DdHandle);
EngAcquireSemaphore(ghsemHmgr);
pEntry = (PDD_ENTRY)((PBYTE)gpentDdHmgr + (sizeof(DD_ENTRY) * Index));
// check if we have object that should be freed
if (pEntry->pobj)
DdFreeObject(pEntry->pobj);
pEntry->NextFree = ghFreeDdHmgr;
// reset process ID
pEntry->Pid = (HANDLE)((DWORD)pEntry->Pid & 1);
ghFreeDdHmgr = Index;
EngReleaseSemaphore(ghsemHmgr);
}