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https://github.com/ApfelTeeSaft/reactos.git
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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
/*
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* COPYRIGHT: See COPYING in the top level directory
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* PROJECT: ReactOS kernel
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* PURPOSE: Engine floating point functions
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* FILE: win32ss/gdi/eng/float.c
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* PROGRAMER: David Welch
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*/
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/* INCLUDES *****************************************************************/
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#include <win32k.h>
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#define NDEBUG
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#include <debug.h>
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typedef struct _WIN32K_FLOATING_SAVE
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{
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KFLOATING_SAVE FloatState;
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BOOLEAN IsFloatingPointSaved;
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} WIN32K_FLOATING_SAVE, *PWIN32K_FLOATING_SAVE;
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/* FUNCTIONS *****************************************************************/
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#ifdef _PREFAST_
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#pragma warning(disable:__WARNING_WRONG_KIND)
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#endif
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_Check_return_
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_Success_(return)
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_Kernel_float_restored_
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_At_(*pBuffer, _Kernel_requires_resource_held_(EngFloatState)
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_Kernel_releases_resource_(EngFloatState))
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ENGAPI
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BOOL
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APIENTRY
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EngRestoreFloatingPointState(
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_In_reads_(_Inexpressible_(statesize)) PVOID pBuffer)
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{
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NTSTATUS Status;
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PWIN32K_FLOATING_SAVE State = (PWIN32K_FLOATING_SAVE)pBuffer;
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if (!State->IsFloatingPointSaved)
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{
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DPRINT1("The driver has attempted to restore floating point state after already restoring it.\n");
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DPRINT1("This (probably ICafe AMD) driver has done an incorrect behavior.\n");
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return FALSE;
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}
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State->IsFloatingPointSaved = FALSE;
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Status = KeRestoreFloatingPointState(&State->FloatState);
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if (!NT_SUCCESS(Status))
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{
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return FALSE;
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}
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return TRUE;
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}
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_Check_return_
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_Success_(((pBuffer != NULL && cjBufferSize != 0) && return == 1) ||
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((pBuffer == NULL || cjBufferSize == 0) && return > 0))
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_When_(pBuffer != NULL && cjBufferSize != 0 && return == 1, _Kernel_float_saved_
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_At_(*pBuffer, _Post_valid_ _Kernel_acquires_resource_(EngFloatState)))
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_On_failure_(_Post_satisfies_(return == 0))
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ENGAPI
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ULONG
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APIENTRY
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EngSaveFloatingPointState(
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_At_(*pBuffer, _Kernel_requires_resource_not_held_(EngFloatState))
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_Out_writes_bytes_opt_(cjBufferSize) PVOID pBuffer,
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_Inout_ ULONG cjBufferSize)
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{
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PWIN32K_FLOATING_SAVE State;
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NTSTATUS Status;
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if ((pBuffer == NULL) || (cjBufferSize == 0))
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{
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KFLOATING_SAVE TempBuffer;
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/* Check for floating point support. */
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Status = KeSaveFloatingPointState(&TempBuffer);
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if (Status != STATUS_SUCCESS)
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{
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return(0);
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}
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KeRestoreFloatingPointState(&TempBuffer);
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return sizeof(WIN32K_FLOATING_SAVE);
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}
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if (cjBufferSize < sizeof(WIN32K_FLOATING_SAVE))
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{
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return(0);
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}
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/* Per MSDN, "This buffer must be zero-initialized, and must be in nonpaged memory." */
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State = (PWIN32K_FLOATING_SAVE)pBuffer;
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if (State->IsFloatingPointSaved)
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{
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DPRINT1("The driver has attempted to save floating point state after already saving it.\n");
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DPRINT1("This (probably ICafe AMD) driver has done an incorrect behavior.\n");
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}
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Status = KeSaveFloatingPointState(&State->FloatState);
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if (!NT_SUCCESS(Status))
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{
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return FALSE;
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}
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State->IsFloatingPointSaved = TRUE;
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return TRUE;
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}
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