1 /* $OpenBSD: fpu.h,v 1.9 2011/03/23 16:54:34 pirofti Exp $ */ 2 /* $NetBSD: fpu.h,v 1.1 2003/04/26 18:39:40 fvdl Exp $ */ 3 4 #ifndef _MACHINE_FPU_H_ 5 #define _MACHINE_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 } __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 extern uint32_t fpu_mxcsr_mask; 53 54 void fpuinit(struct cpu_info *); 55 void fpudrop(void); 56 void fpudiscard(struct proc *); 57 void fputrap(struct trapframe *); 58 void fpusave_proc(struct proc *, int); 59 void fpusave_cpu(struct cpu_info *, int); 60 void fpu_kernel_enter(void); 61 void fpu_kernel_exit(void); 62 63 #endif 64 65 #endif /* _MACHINE_FPU_H_ */ 66
