;------------------------------------------------------------------------------

; Return the current FPU rounding mode.

;

; MASM implementation of the flt_rounds function from NetBSD.

;

; Copyright (c) 2010, Intel Corporation. All rights reserved.<BR>

; This program and the accompanying materials

; are licensed and made available under the terms and conditions of the BSD License

; which accompanies this distribution. The full text of the license may be found at

; http://opensource.org/licenses/bsd-license.php.

;

; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,

; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

;

;------------------------------------------------------------------------------

.code

;_map BYTE 1 ; round to nearest

; BYTE 3 ; round to negative infinity

; BYTE 2 ; round to positive infinity

; BYTE 0 ; round to zero

;------------------------------------------------------------------------------

; int

; EFIAPI

; fpu_rmode( void );

;

; VC++ always creates space for 4 parameters on the stack, whether they are

; used or not. We use one for temporary storage since the only variant of

; fnstcw saves to memory, NOT a register.

;------------------------------------------------------------------------------

internal_FPU_rmode PROC

fnstcw [rsp + 8] ; save 16-bit FPU Control Word

mov eax, [rsp + 8] ; get the saved FPU Control Word

shr eax, 10

and rax, 3 ; index is only the LSB two bits in RAX

ret ; Return rounding mode in RAX

internal_FPU_rmode ENDP

END