diff options
Diffstat (limited to 'kernel/arch/x86/math-emu/control_w.h')
| -rw-r--r-- | kernel/arch/x86/math-emu/control_w.h | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/kernel/arch/x86/math-emu/control_w.h b/kernel/arch/x86/math-emu/control_w.h new file mode 100644 index 000000000..ae2274dbd --- /dev/null +++ b/kernel/arch/x86/math-emu/control_w.h @@ -0,0 +1,45 @@ +/*---------------------------------------------------------------------------+ + | control_w.h | + | | + | Copyright (C) 1992,1993 | + | W. Metzenthen, 22 Parker St, Ormond, Vic 3163, | + | Australia. E-mail billm@vaxc.cc.monash.edu.au | + | | + +---------------------------------------------------------------------------*/ + +#ifndef _CONTROLW_H_ +#define _CONTROLW_H_ + +#ifdef __ASSEMBLY__ +#define _Const_(x) $##x +#else +#define _Const_(x) x +#endif + +#define CW_RC _Const_(0x0C00) /* rounding control */ +#define CW_PC _Const_(0x0300) /* precision control */ + +#define CW_Precision Const_(0x0020) /* loss of precision mask */ +#define CW_Underflow Const_(0x0010) /* underflow mask */ +#define CW_Overflow Const_(0x0008) /* overflow mask */ +#define CW_ZeroDiv Const_(0x0004) /* divide by zero mask */ +#define CW_Denormal Const_(0x0002) /* denormalized operand mask */ +#define CW_Invalid Const_(0x0001) /* invalid operation mask */ + +#define CW_Exceptions _Const_(0x003f) /* all masks */ + +#define RC_RND _Const_(0x0000) +#define RC_DOWN _Const_(0x0400) +#define RC_UP _Const_(0x0800) +#define RC_CHOP _Const_(0x0C00) + +/* p 15-5: Precision control bits affect only the following: + ADD, SUB(R), MUL, DIV(R), and SQRT */ +#define PR_24_BITS _Const_(0x000) +#define PR_53_BITS _Const_(0x200) +#define PR_64_BITS _Const_(0x300) +#define PR_RESERVED_BITS _Const_(0x100) +/* FULL_PRECISION simulates all exceptions masked */ +#define FULL_PRECISION (PR_64_BITS | RC_RND | 0x3f) + +#endif /* _CONTROLW_H_ */ |