66 lines
1.5 KiB
C
66 lines
1.5 KiB
C
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/* $OpenBSD: fpu.h,v 1.9 2011/03/23 16:54:34 pirofti Exp $ */
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/* $NetBSD: fpu.h,v 1.1 2003/04/26 18:39:40 fvdl Exp $ */
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#ifndef _MACHINE_FPU_H_
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#define _MACHINE_FPU_H_
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#include <sys/types.h>
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/*
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* amd64 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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* Must be stored in memory on a 16-byte boundary.
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*/
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struct fxsave64 {
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u_int16_t fx_fcw;
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u_int16_t fx_fsw;
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u_int8_t fx_ftw;
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u_int8_t fx_unused1;
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u_int16_t fx_fop;
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u_int64_t fx_rip;
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u_int64_t fx_rdp;
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u_int32_t fx_mxcsr;
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u_int32_t fx_mxcsr_mask;
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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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} __packed;
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struct savefpu {
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struct fxsave64 fp_fxsave; /* see above */
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u_int16_t fp_ex_sw; /* saved status from last exception */
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u_int16_t fp_ex_tw; /* saved tag from last exception */
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};
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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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*/
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#define __INITIAL_NPXCW__ 0x037f
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#define __INITIAL_MXCSR__ 0x1f80
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#define __INITIAL_MXCSR_MASK__ 0xffbf
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#ifdef _KERNEL
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/*
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* XXX
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*/
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struct trapframe;
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struct cpu_info;
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extern uint32_t fpu_mxcsr_mask;
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void fpuinit(struct cpu_info *);
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void fpudrop(void);
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void fpudiscard(struct proc *);
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void fputrap(struct trapframe *);
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void fpusave_proc(struct proc *, int);
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void fpusave_cpu(struct cpu_info *, int);
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void fpu_kernel_enter(void);
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void fpu_kernel_exit(void);
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#endif
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#endif /* _MACHINE_FPU_H_ */
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