reactos/ntoskrnl/ex/exintrin.c

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/*
* PROJECT: ReactOS Kernel
* LICENSE: BSD - See COPYING.ARM in the top level directory
* FILE: ntoskrnl/ex/exintrin.c
* PURPOSE: Exported kernel functions which are now intrinsics
* PROGRAMMERS: ReactOS Portable Systems Group
*/
/* INCLUDES *******************************************************************/
#include <ntoskrnl.h>
#define NDEBUG
#include <debug.h>
#undef InterlockedIncrement
#undef InterlockedDecrement
#undef InterlockedCompareExchange
#undef InterlockedExchangeAdd
#undef InterlockedExchange
//
// HAL Port to Inlined Port
//
#define H2I(Port) PtrToUshort(Port)
/* FUNCTIONS ******************************************************************/
/*
* @implemented
*/
LONG
FASTCALL
InterlockedIncrement(IN LONG volatile *Addend)
{
//
// Call the intrinsic
//
return _InterlockedIncrement(Addend);
}
/*
* @implemented
*/
LONG
FASTCALL
InterlockedDecrement(IN LONG volatile *Addend)
{
//
// Call the intrinsic
//
return _InterlockedDecrement(Addend);
}
/*
* @implemented
*/
LONG
FASTCALL
InterlockedCompareExchange(IN OUT LONG volatile *Destination,
IN LONG Exchange,
IN LONG Comperand)
{
//
// Call the intrinsic
//
return _InterlockedCompareExchange(Destination, Exchange, Comperand);
}
/*
* @implemented
*/
LONG
FASTCALL
InterlockedExchange(IN OUT LONG volatile *Destination,
IN LONG Value)
{
//
// Call the intrinsic
//
return _InterlockedExchange(Destination, Value);
}
/*
* @implemented
*/
LONG
FASTCALL
InterlockedExchangeAdd(IN OUT LONG volatile *Addend,
IN LONG Increment)
{
//
// Call the intrinsic
//
return _InterlockedExchangeAdd(Addend, Increment);
}
/*
* @implemented
*/
VOID
NTAPI
ProbeForRead(IN CONST VOID *Address,
IN SIZE_T Length,
IN ULONG Alignment)
{
ULONG_PTR Last, Current = (ULONG_PTR)Address;
PAGED_CODE();
/* Only probe if we have a valid length */
if (Length != 0)
{
/* Sanity check */
ASSERT((Alignment == 1) ||
(Alignment == 2) ||
(Alignment == 4) ||
(Alignment == 8) ||
(Alignment == 16));
/* Check the alignment */
if ((Current & (Alignment - 1)) != 0)
{
/* Incorrect alignment */
ExRaiseDatatypeMisalignment();
}
/* Get the end address */
Last = Current + Length - 1;
if ((Last < Current) || (Last >= (ULONG_PTR)MmUserProbeAddress))
{
/* Raise an access violation */
ExRaiseAccessViolation();
}
/* ProbeForRead doesn't check if memory pages are readable! */
}
}
/*
* @implemented
*/
VOID
NTAPI
ProbeForWrite(IN PVOID Address,
IN SIZE_T Length,
IN ULONG Alignment)
{
ULONG_PTR Last, Current = (ULONG_PTR)Address;
PAGED_CODE();
/* Only probe if we have a valid length */
if (Length != 0)
{
/* Sanity check */
ASSERT((Alignment == 1) ||
(Alignment == 2) ||
(Alignment == 4) ||
(Alignment == 8) ||
(Alignment == 16));
/* Check the alignment */
if ((Current & (Alignment - 1)) != 0)
{
/* Incorrect alignment */
ExRaiseDatatypeMisalignment();
}
/* Get the end address */
Last = Current + Length - 1;
if ((Last < Current) || (Last >= (ULONG_PTR)MmUserProbeAddress))
{
/* Raise an access violation */
ExRaiseAccessViolation();
}
/* Round down to the last page */
Last = PAGE_ROUND_DOWN(Last) + PAGE_SIZE;
do
{
/* Attempt a write */
*(volatile CHAR*)Current = *(volatile CHAR*)Current;
/* Go to the next address */
Current = PAGE_ROUND_DOWN(Current) + PAGE_SIZE;
} while (Current != Last);
}
}