85 lines
2.0 KiB
C
85 lines
2.0 KiB
C
/* $NetBSD: fpu.h,v 1.1 2001/06/19 00:20:10 fvdl Exp $ */
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#ifndef _X86_64_FPU_H_
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#define _X86_64_FPU_H_
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/*
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* NetBSD/x86_64 only uses the extended save/restore format used
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* by fxsave/fsrestore, to always deal with the SSE registers,
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* which are part of the ABI to pass floating point values.
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*/
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struct fxsave64 {
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u_int64_t fx_fcw:16;
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u_int64_t fx_fsw:16;
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u_int64_t fx_unused1:8;
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u_int64_t fx_ftw:8;
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u_int64_t fx_fop:16;
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u_int64_t fx_rip;
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u_int64_t fx_dp;
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u_int64_t fx_mxcsr:32;
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u_int64_t fx_unused2:32;
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u_int64_t fx_st[8 * 2]; /* 8 normal FP regs */
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u_int64_t fx_xmm[16 * 2]; /* 16 SSE2 registers */
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u_int8_t fx_unused3[96];
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} __attribute__ ((aligned (16)));
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/*
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* This one only used for backward compat coredumping.
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*/
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struct oldfsave {
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u_int16_t fs_control;
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u_int16_t fs_unused0;
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u_int16_t fs_status;
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u_int16_t fs_unused1;
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u_int16_t fs_tag;
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u_int16_t fs_unused2;
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u_int32_t fs_ipoff;
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u_int16_t fs_ipsel;
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u_int16_t fs_op;
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u_int32_t fs_opoff;
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u_int16_t fs_opsel;
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} __attribute__ ((packed));
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/*
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* The i387 defaults to Intel extended precision mode and round to nearest,
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* with all exceptions masked.
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* XXXfvdl check this. This stuff is probably invalid.
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*/
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#define __INITIAL_NPXCW__ 0x037f
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/* NetBSD uses IEEE double precision. */
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#define __NetBSD_NPXCW__ 0x127f
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/* Linux just uses the default control word. */
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#define __Linux_NPXCW__ 0x037f
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/*
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* The standard control word from finit is 0x37F, giving:
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* round to nearest
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* 64-bit precision
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* all exceptions masked.
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*
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* Now we want:
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* affine mode (if we decide to support 287's)
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* round to nearest
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* 53-bit precision
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* all exceptions masked.
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*
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* 64-bit precision often gives bad results with high level languages
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* because it makes the results of calculations depend on whether
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* intermediate values are stored in memory or in FPU registers.
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*/
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/*
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* XXX
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*/
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struct trapframe;
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extern void fpuinit(void);
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extern void fpudrop(void);
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extern void fpusave(void);
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extern void fputrap(struct trapframe *);
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extern struct proc *fpuproc;
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#endif /* _X86_64_FPU_H_ */
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