minix/lib/i386/math/fpu_cw.h
2009-12-24 20:22:41 +00:00

33 lines
1 KiB
C

#ifndef __FPU_CW__
#define __FPU_CW__
#include <stdint.h>
/*
* see section 8.1.5 "x87 FPU Control Word" in "Intel 64 and IA-32 Architectures
* Software Developer's Manual Volume 1 Basic Architecture"
*/
#define FPUCW_EXCEPTION_MASK 0x003f
#define FPUCW_EXCEPTION_MASK_IM 0x0001
#define FPUCW_EXCEPTION_MASK_DM 0x0002
#define FPUCW_EXCEPTION_MASK_ZM 0x0004
#define FPUCW_EXCEPTION_MASK_OM 0x0008
#define FPUCW_EXCEPTION_MASK_UM 0x0010
#define FPUCW_EXCEPTION_MASK_PM 0x0020
#define FPUCW_PRECISION_CONTROL 0x0300
#define FPUCW_PRECISION_CONTROL_SINGLE 0x0000
#define FPUCW_PRECISION_CONTROL_DOUBLE 0x0200
#define FPUCW_PRECISION_CONTROL_XDOUBLE 0x0300
#define FPUCW_ROUNDING_CONTROL 0x0c00
#define FPUCW_ROUNDING_CONTROL_NEAREST 0x0000
#define FPUCW_ROUNDING_CONTROL_DOWN 0x0400
#define FPUCW_ROUNDING_CONTROL_UP 0x0800
#define FPUCW_ROUNDING_CONTROL_TRUNC 0x0c00
/* get and set FPU control word */
u16_t fpu_cw_get(void);
void fpu_cw_set(u16_t fpu_cw);
#endif /* !defined(__FPU_CW__) */