diff options
Diffstat (limited to 'WinQuake/sys_dosa.s')
| -rw-r--r-- | WinQuake/sys_dosa.s | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/WinQuake/sys_dosa.s b/WinQuake/sys_dosa.s new file mode 100644 index 0000000..7b0ea61 --- /dev/null +++ b/WinQuake/sys_dosa.s @@ -0,0 +1,95 @@ +// +// 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 + |