mirror of
https://github.com/ApfelTeeSaft/reactos.git
synced 2026-08-26 19:33:31 +00:00
a30ed15ceb
According to the kerestorefloatingpointstate msdn article shouldn't be on the kernel's responsibility to handle. for the life of me i couldn't figure out why this specific driver does this until finally I tried this on Windows and low and behold on checked builds of windows it actually tells you it does the exact same thing. Investigating deeper I realized win32k just has some extra handling for this dumb case. Co-authored-by: Hermès BÉLUSCA - MAÏTO <[email protected]> Co-authored-by: Timo Kreuzer <[email protected]>
115 lines
3.1 KiB
C
115 lines
3.1 KiB
C
/*
|
|
* COPYRIGHT: See COPYING in the top level directory
|
|
* PROJECT: ReactOS kernel
|
|
* PURPOSE: Engine floating point functions
|
|
* FILE: win32ss/gdi/eng/float.c
|
|
* PROGRAMER: David Welch
|
|
*/
|
|
|
|
/* INCLUDES *****************************************************************/
|
|
|
|
#include <win32k.h>
|
|
|
|
#define NDEBUG
|
|
#include <debug.h>
|
|
|
|
typedef struct _WIN32K_FLOATING_SAVE
|
|
{
|
|
KFLOATING_SAVE FloatState;
|
|
BOOLEAN IsFloatingPointSaved;
|
|
} WIN32K_FLOATING_SAVE, *PWIN32K_FLOATING_SAVE;
|
|
|
|
/* FUNCTIONS *****************************************************************/
|
|
|
|
#ifdef _PREFAST_
|
|
#pragma warning(disable:__WARNING_WRONG_KIND)
|
|
#endif
|
|
|
|
_Check_return_
|
|
_Success_(return)
|
|
_Kernel_float_restored_
|
|
_At_(*pBuffer, _Kernel_requires_resource_held_(EngFloatState)
|
|
_Kernel_releases_resource_(EngFloatState))
|
|
ENGAPI
|
|
BOOL
|
|
APIENTRY
|
|
EngRestoreFloatingPointState(
|
|
_In_reads_(_Inexpressible_(statesize)) PVOID pBuffer)
|
|
{
|
|
NTSTATUS Status;
|
|
PWIN32K_FLOATING_SAVE State = (PWIN32K_FLOATING_SAVE)pBuffer;
|
|
|
|
if (!State->IsFloatingPointSaved)
|
|
{
|
|
DPRINT1("The driver has attempted to restore floating point state after already restoring it.\n");
|
|
DPRINT1("This (probably ICafe AMD) driver has done an incorrect behavior.\n");
|
|
return FALSE;
|
|
}
|
|
|
|
State->IsFloatingPointSaved = FALSE;
|
|
|
|
Status = KeRestoreFloatingPointState(&State->FloatState);
|
|
if (!NT_SUCCESS(Status))
|
|
{
|
|
return FALSE;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
_Check_return_
|
|
_Success_(((pBuffer != NULL && cjBufferSize != 0) && return == 1) ||
|
|
((pBuffer == NULL || cjBufferSize == 0) && return > 0))
|
|
_When_(pBuffer != NULL && cjBufferSize != 0 && return == 1, _Kernel_float_saved_
|
|
_At_(*pBuffer, _Post_valid_ _Kernel_acquires_resource_(EngFloatState)))
|
|
_On_failure_(_Post_satisfies_(return == 0))
|
|
ENGAPI
|
|
ULONG
|
|
APIENTRY
|
|
EngSaveFloatingPointState(
|
|
_At_(*pBuffer, _Kernel_requires_resource_not_held_(EngFloatState))
|
|
_Out_writes_bytes_opt_(cjBufferSize) PVOID pBuffer,
|
|
_Inout_ ULONG cjBufferSize)
|
|
{
|
|
PWIN32K_FLOATING_SAVE State;
|
|
NTSTATUS Status;
|
|
|
|
if ((pBuffer == NULL) || (cjBufferSize == 0))
|
|
{
|
|
KFLOATING_SAVE TempBuffer;
|
|
|
|
/* Check for floating point support. */
|
|
Status = KeSaveFloatingPointState(&TempBuffer);
|
|
if (Status != STATUS_SUCCESS)
|
|
{
|
|
return(0);
|
|
}
|
|
KeRestoreFloatingPointState(&TempBuffer);
|
|
return sizeof(WIN32K_FLOATING_SAVE);
|
|
}
|
|
|
|
if (cjBufferSize < sizeof(WIN32K_FLOATING_SAVE))
|
|
{
|
|
return(0);
|
|
}
|
|
|
|
/* Per MSDN, "This buffer must be zero-initialized, and must be in nonpaged memory." */
|
|
State = (PWIN32K_FLOATING_SAVE)pBuffer;
|
|
|
|
if (State->IsFloatingPointSaved)
|
|
{
|
|
DPRINT1("The driver has attempted to save floating point state after already saving it.\n");
|
|
DPRINT1("This (probably ICafe AMD) driver has done an incorrect behavior.\n");
|
|
}
|
|
|
|
Status = KeSaveFloatingPointState(&State->FloatState);
|
|
if (!NT_SUCCESS(Status))
|
|
{
|
|
return FALSE;
|
|
}
|
|
|
|
State->IsFloatingPointSaved = TRUE;
|
|
return TRUE;
|
|
}
|
|
|