120 lines
2.8 KiB
C
120 lines
2.8 KiB
C
/**
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*** Copyright (C) 1996-97 Intel Corporation. All rights reserved.
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***
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*** The information and source code contained herein is the exclusive
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*** property of Intel Corporation and may not be disclosed, examined
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*** or reproduced in whole or in part without explicit written authorization
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*** from the company.
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**/
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/*++
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Copyright (c) 1996 Intel Corporation
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Module Name:
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floatem.c
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Abstract:
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This module implements IA64 machine dependent floating point emulation
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functions to support the IEEE floating point standard.
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Author:
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Marius Cornea-Hasegan Sep-96
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Environment:
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Kernel mode only.
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Revision History:
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Modfied Jan. 97, Jan 98, Jun 98 (new API)
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--*/
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#include "ki.h"
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#include "ntfpia64.h"
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#include "floatem.h"
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extern LONG
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HalFpEmulate (
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ULONG trap_type,
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BUNDLE *pBundle,
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ULONGLONG *pipsr,
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ULONGLONG *pfpsr,
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ULONGLONG *pisr,
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ULONGLONG *ppreds,
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ULONGLONG *pifs,
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FP_STATE *fp_state
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);
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#define ALL_FP_REGISTERS_SAVED 0xFFFFFFFFFFFFFFFFi64
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int
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fp_emulate (
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int trap_type,
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BUNDLE *pbundle,
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EM_int64_t *pipsr,
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EM_int64_t *pfpsr,
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EM_int64_t *pisr,
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EM_int64_t *ppreds,
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EM_int64_t *pifs,
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void *fp_state
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)
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{
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//
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// Pointer to old Floating point state FLOATING_POINT_STATE
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//
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FLOATING_POINT_STATE *Ptr0FPState;
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PKEXCEPTION_FRAME LocalExceptionFramePtr;
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PKTRAP_FRAME LocalTrapFramePtr;
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FP_STATE FpState;
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KIRQL OldIrql;
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BOOLEAN LessThanAPC;
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int Status;
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Ptr0FPState = (PFLOATING_POINT_STATE) fp_state;
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LocalExceptionFramePtr = (PKEXCEPTION_FRAME) (Ptr0FPState->ExceptionFrame);
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LocalTrapFramePtr = (PKTRAP_FRAME) (Ptr0FPState->TrapFrame);
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FpState.bitmask_low64 = ALL_FP_REGISTERS_SAVED;
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FpState.bitmask_high64 = ALL_FP_REGISTERS_SAVED;
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(FLOAT128 *)FpState.fp_state_low_preserved = &(LocalExceptionFramePtr->FltS0);
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(FLOAT128 *)FpState.fp_state_low_volatile = &(LocalTrapFramePtr->FltT0);
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(FLOAT128 *)FpState.fp_state_high_preserved = &(LocalExceptionFramePtr->FltS4);
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(FLOAT128 *)FpState.fp_state_high_volatile = (PFLOAT128)GET_HIGH_FLOATING_POINT_REGISTER_SAVEAREA(KeGetCurrentThread()->StackBase);
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if (KeGetCurrentIrql() < APC_LEVEL) {
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LessThanAPC = 1;
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} else {
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LessThanAPC = 0;
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}
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if (LessThanAPC) {
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KeRaiseIrql (APC_LEVEL, &OldIrql);
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}
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Status = HalFpEmulate(trap_type,
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pbundle,
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pipsr,
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pfpsr,
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pisr,
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ppreds,
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pifs,
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&FpState
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);
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if (LessThanAPC) {
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KeLowerIrql (OldIrql);
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}
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return Status;
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}
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