| // |
| // sys_dosa.s |
| // x86 assembly-language DOS-dependent routines. |
| |
| #include "asm_i386.h" |
| #include "quakeasm.h" |
| |
| |
| .data |
| |
| .align 4 |
| fpenv: |
| .long 0, 0, 0, 0, 0, 0, 0, 0 |
| |
| .text |
| |
| .globl C(MaskExceptions) |
| C(MaskExceptions): |
| fnstenv fpenv |
| orl $0x3F,fpenv |
| fldenv fpenv |
| |
| ret |
| |
| #if 0 |
| .globl C(unmaskexceptions) |
| C(unmaskexceptions): |
| fnstenv fpenv |
| andl $0xFFFFFFE0,fpenv |
| fldenv fpenv |
| |
| ret |
| #endif |
| |
| .data |
| |
| .align 4 |
| .globl ceil_cw, single_cw, full_cw, cw, pushed_cw |
| ceil_cw: .long 0 |
| single_cw: .long 0 |
| full_cw: .long 0 |
| cw: .long 0 |
| pushed_cw: .long 0 |
| |
| .text |
| |
| .globl C(Sys_LowFPPrecision) |
| C(Sys_LowFPPrecision): |
| fldcw single_cw |
| |
| ret |
| |
| .globl C(Sys_HighFPPrecision) |
| C(Sys_HighFPPrecision): |
| fldcw full_cw |
| |
| ret |
| |
| .globl C(Sys_PushFPCW_SetHigh) |
| C(Sys_PushFPCW_SetHigh): |
| fnstcw pushed_cw |
| fldcw full_cw |
| |
| ret |
| |
| .globl C(Sys_PopFPCW) |
| C(Sys_PopFPCW): |
| fldcw pushed_cw |
| |
| ret |
| |
| .globl C(Sys_SetFPCW) |
| C(Sys_SetFPCW): |
| fnstcw cw |
| movl cw,%eax |
| #if id386 |
| andb $0xF0,%ah |
| orb $0x03,%ah // round mode, 64-bit precision |
| #endif |
| movl %eax,full_cw |
| |
| #if id386 |
| andb $0xF0,%ah |
| orb $0x0C,%ah // chop mode, single precision |
| #endif |
| movl %eax,single_cw |
| |
| #if id386 |
| andb $0xF0,%ah |
| orb $0x08,%ah // ceil mode, single precision |
| #endif |
| movl %eax,ceil_cw |
| |
| ret |
| |
