256 lines
3.5 KiB
ArmAsm
256 lines
3.5 KiB
ArmAsm
/*
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Copyright (C) 1996-1997 Id Software, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the 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 this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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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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#ifndef NOASM
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#include "asm_i386.h"
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#include "quakeasm.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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.intel_syntax noprefix
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.globl C(SetYourBlues)
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C(SetYourBlues):
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push ax
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push dx
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mov dx, 0x3C8
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mov ax, 1
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out dx, al
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inc dx
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mov ax, 1
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out dx, al
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mov ax, 5
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out dx, al
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mov ax, 16
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out dx, al
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pop dx
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pop ax
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ret
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.globl C(SetYourBrowns)
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C(SetYourBrowns):
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// Quake startup text mode scheme
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// background brown
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push ax
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push dx
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mov dx, 0x3C8
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mov ax, 1
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out dx, al
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inc dx
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mov ax, 14
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out dx, al
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mov ax, 9
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out dx, al
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mov ax, 4
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out dx, al
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pop dx
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pop ax
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// Console-style REALLY background brown, kind of cool
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push ax
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push dx
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mov dx, 0x3C8
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mov ax, 0
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out dx, al
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inc dx
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mov ax, 12
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out dx, al
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mov ax, 7
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out dx, al
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mov ax, 2
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out dx, al
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pop dx
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pop ax
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// status grays (are now brown)
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/*
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push ax
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push dx
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mov dx, 0x3C8
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mov ax, 7
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out dx, al
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inc dx
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mov ax, 121
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out dx, al
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mov ax, 110
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out dx, al
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mov ax, 22
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out dx, al
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pop dx
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pop ax
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*/
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push ax
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push dx
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mov dx, 0x3C8
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mov ax, 7
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out dx, al
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inc dx
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mov ax, 48
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out dx, al
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mov ax, 48
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out dx, al
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mov ax, 48
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out dx, al
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pop dx
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pop ax
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// Title bar
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push ax
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push dx
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mov dx, 0x3C8
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mov ax, 2
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out dx, al
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inc dx
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mov ax, 56
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out dx, al
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mov ax, 48
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out dx, al
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mov ax, 15
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out dx, al
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pop dx
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pop ax
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ret
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#endif
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