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Annotation of sys/arch/amd64/include/fpu.h, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: fpu.h,v 1.3 2006/10/01 10:52:10 kettenis Exp $        */
                      2: /*     $NetBSD: fpu.h,v 1.1 2003/04/26 18:39:40 fvdl Exp $     */
                      3:
                      4: #ifndef        _AMD64_FPU_H_
                      5: #define        _AMD64_FPU_H_
                      6:
                      7: #include <sys/types.h>
                      8:
                      9: /*
                     10:  * amd64 only uses the extended save/restore format used
                     11:  * by fxsave/fsrestore, to always deal with the SSE registers,
                     12:  * which are part of the ABI to pass floating point values.
                     13:  * Must be stored in memory on a 16-byte boundary.
                     14:  */
                     15:
                     16: struct fxsave64 {
                     17:        u_int16_t  fx_fcw;
                     18:        u_int16_t  fx_fsw;
                     19:        u_int8_t   fx_ftw;
                     20:        u_int8_t   fx_unused1;
                     21:        u_int16_t  fx_fop;
                     22:        u_int64_t  fx_rip;
                     23:        u_int64_t  fx_rdp;
                     24:        u_int32_t  fx_mxcsr;
                     25:        u_int32_t  fx_mxcsr_mask;
                     26:        u_int64_t  fx_st[8][2];   /* 8 normal FP regs */
                     27:        u_int64_t  fx_xmm[16][2]; /* 16 SSE2 registers */
                     28:        u_int8_t   fx_unused3[96];
                     29: } __attribute__((packed));
                     30:
                     31: struct savefpu {
                     32:        struct fxsave64 fp_fxsave;      /* see above */
                     33:        u_int16_t fp_ex_sw;             /* saved status from last exception */
                     34:        u_int16_t fp_ex_tw;             /* saved tag from last exception */
                     35: };
                     36:
                     37: /*
                     38:  * The i387 defaults to Intel extended precision mode and round to nearest,
                     39:  * with all exceptions masked.
                     40:  */
                     41: #define        __INITIAL_NPXCW__       0x037f
                     42: #define __INITIAL_MXCSR__      0x1f80
                     43: #define __INITIAL_MXCSR_MASK__ 0xffbf
                     44:
                     45: #ifdef _KERNEL
                     46: /*
                     47:  * XXX
                     48:  */
                     49: struct trapframe;
                     50: struct cpu_info;
                     51:
                     52: void fpuinit(struct cpu_info *);
                     53: void fpudrop(void);
                     54: void fpusave(struct proc *);
                     55: void fpudiscard(struct proc *);
                     56: void fputrap(struct trapframe *);
                     57: void fpusave_proc(struct proc *, int);
                     58: void fpusave_cpu(struct cpu_info *, int);
                     59:
                     60: #endif
                     61:
                     62: #endif /* _AMD64_FPU_H_ */