2005-08-26 17:39:27 +00:00
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/*
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===========================================================================
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Copyright (C) 1999-2005 Id Software, Inc.
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This file is part of Quake III Arena source code.
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Quake III Arena source code is free software; you can redistribute it
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and/or modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the License,
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or (at your option) any later version.
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Quake III Arena source code is distributed in the hope that it will be
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useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Foobar; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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===========================================================================
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*/
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//
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// sys_dosa.s
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// x86 assembly-language DOS-dependent routines.
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#include "qasm.h"
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.data
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.align 4
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fpenv:
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.long 0, 0, 0, 0, 0, 0, 0, 0
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.text
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.globl C(MaskExceptions)
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C(MaskExceptions):
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fnstenv fpenv
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orl $0x3F,fpenv
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fldenv fpenv
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ret
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#if 0
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.globl C(unmaskexceptions)
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C(unmaskexceptions):
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fnstenv fpenv
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andl $0xFFFFFFE0,fpenv
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fldenv fpenv
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ret
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#endif
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.data
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.align 4
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.globl ceil_cw, single_cw, full_cw, cw, pushed_cw
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ceil_cw: .long 0
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single_cw: .long 0
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full_cw: .long 0
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cw: .long 0
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pushed_cw: .long 0
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.text
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.globl C(Sys_LowFPPrecision)
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C(Sys_LowFPPrecision):
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fldcw single_cw
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ret
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.globl C(Sys_HighFPPrecision)
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C(Sys_HighFPPrecision):
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fldcw full_cw
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ret
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.globl C(Sys_PushFPCW_SetHigh)
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C(Sys_PushFPCW_SetHigh):
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fnstcw pushed_cw
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fldcw full_cw
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ret
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.globl C(Sys_PopFPCW)
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C(Sys_PopFPCW):
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fldcw pushed_cw
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ret
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.globl C(Sys_SetFPCW)
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C(Sys_SetFPCW):
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fnstcw cw
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movl cw,%eax
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#if id386
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andb $0xF0,%ah
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orb $0x03,%ah // round mode, 64-bit precision
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#endif
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movl %eax,full_cw
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#if id386
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andb $0xF0,%ah
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orb $0x0C,%ah // chop mode, single precision
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#endif
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movl %eax,single_cw
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#if id386
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andb $0xF0,%ah
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orb $0x08,%ah // ceil mode, single precision
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#endif
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movl %eax,ceil_cw
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ret
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