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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 5131 | clevermous | 1 | /* |
| 2 | Copyright (C) 1996-1997 Id Software, Inc. |
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| 3 | |||
| 4 | This program is free software; you can redistribute it and/or |
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| 5 | modify it under the terms of the GNU General Public License |
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| 6 | as published by the Free Software Foundation; either version 2 |
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| 7 | of the License, or (at your option) any later version. |
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| 8 | |||
| 9 | This program is distributed in the hope that it will be useful, |
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
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| 12 | |||
| 13 | See the GNU General Public License for more details. |
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| 14 | |||
| 15 | You should have received a copy of the GNU General Public License |
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| 16 | along with this program; if not, write to the Free Software |
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| 17 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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| 18 | |||
| 19 | */ |
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| 20 | // |
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| 21 | // sys_wina.s |
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| 22 | // x86 assembly-language Win-dependent routines. |
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| 23 | |||
| 24 | #define GLQUAKE 1 // don't include unneeded defs |
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| 25 | #include "asm_i386.h" |
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| 26 | #include "quakeasm.h" |
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| 27 | |||
| 28 | // LATER should be id386-dependent, and have an equivalent C path |
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| 29 | |||
| 30 | .data |
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| 31 | |||
| 32 | .align 4 |
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| 33 | fpenv: |
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| 34 | .long 0, 0, 0, 0, 0, 0, 0, 0 |
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| 35 | |||
| 36 | .text |
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| 37 | |||
| 38 | .globl C(MaskExceptions) |
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| 39 | C(MaskExceptions): |
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| 40 | fnstenv fpenv |
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| 41 | orl $0x3F,fpenv |
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| 42 | fldenv fpenv |
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| 43 | |||
| 44 | ret |
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| 45 | |||
| 46 | #if 0 |
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| 47 | .globl C(unmaskexceptions) |
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| 48 | C(unmaskexceptions): |
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| 49 | fnstenv fpenv |
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| 50 | andl $0xFFFFFFE0,fpenv |
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| 51 | fldenv fpenv |
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| 52 | |||
| 53 | ret |
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| 54 | #endif |
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| 55 | |||
| 56 | .data |
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| 57 | |||
| 58 | .align 4 |
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| 59 | .globl ceil_cw, single_cw, full_cw, cw, pushed_cw |
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| 60 | ceil_cw: .long 0 |
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| 61 | single_cw: .long 0 |
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| 62 | full_cw: .long 0 |
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| 63 | cw: .long 0 |
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| 64 | pushed_cw: .long 0 |
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| 65 | |||
| 66 | .text |
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| 67 | |||
| 68 | .globl C(Sys_LowFPPrecision) |
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| 69 | C(Sys_LowFPPrecision): |
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| 70 | fldcw single_cw |
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| 71 | |||
| 72 | ret |
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| 73 | |||
| 74 | .globl C(Sys_HighFPPrecision) |
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| 75 | C(Sys_HighFPPrecision): |
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| 76 | fldcw full_cw |
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| 77 | |||
| 78 | ret |
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| 79 | |||
| 80 | .globl C(Sys_PushFPCW_SetHigh) |
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| 81 | C(Sys_PushFPCW_SetHigh): |
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| 82 | fnstcw pushed_cw |
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| 83 | fldcw full_cw |
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| 84 | |||
| 85 | ret |
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| 86 | |||
| 87 | .globl C(Sys_PopFPCW) |
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| 88 | C(Sys_PopFPCW): |
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| 89 | fldcw pushed_cw |
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| 90 | |||
| 91 | ret |
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| 92 | |||
| 93 | .globl C(Sys_SetFPCW) |
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| 94 | C(Sys_SetFPCW): |
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| 95 | fnstcw cw |
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| 96 | movl cw,%eax |
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| 97 | #if id386 |
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| 98 | andb $0xF0,%ah |
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| 99 | orb $0x03,%ah // round mode, 64-bit precision |
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| 100 | #endif |
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| 101 | movl %eax,full_cw |
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| 102 | |||
| 103 | #if id386 |
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| 104 | andb $0xF0,%ah |
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| 105 | orb $0x0C,%ah // chop mode, single precision |
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| 106 | #endif |
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| 107 | movl %eax,single_cw |
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| 108 | |||
| 109 | #if id386 |
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| 110 | andb $0xF0,%ah |
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| 111 | orb $0x08,%ah // ceil mode, single precision |
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| 112 | #endif |
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| 113 | movl %eax,ceil_cw |
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| 114 | |||
| 115 | ret |
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| 116 |