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