X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/6601e61aa18bf4f09af135ff61fc7f4771d23b06..36401178fd6817c043cc00b0c00c7f723e58efae:/osfmk/i386/fpu.h?ds=sidebyside diff --git a/osfmk/i386/fpu.h b/osfmk/i386/fpu.h index 618e2e3ce..cd0b78906 100644 --- a/osfmk/i386/fpu.h +++ b/osfmk/i386/fpu.h @@ -1,23 +1,29 @@ /* - * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. + * Copyright (c) 2000-2006 Apple Computer, Inc. All rights reserved. * - * @APPLE_LICENSE_HEADER_START@ + * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * - * The contents of this file constitute Original Code as defined in and - * are subject to the Apple Public Source License Version 1.1 (the - * "License"). You may not use this file except in compliance with the - * License. Please obtain a copy of the License at - * http://www.apple.com/publicsource and read it before using this file. + * This file contains Original Code and/or Modifications of Original Code + * as defined in and that are subject to the Apple Public Source License + * Version 2.0 (the 'License'). You may not use this file except in + * compliance with the License. The rights granted to you under the License + * may not be used to create, or enable the creation or redistribution of, + * unlawful or unlicensed copies of an Apple operating system, or to + * circumvent, violate, or enable the circumvention or violation of, any + * terms of an Apple operating system software license agreement. * - * This Original Code and all software distributed under the License are - * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER + * Please obtain a copy of the License at + * http://www.opensource.apple.com/apsl/ and read it before using this file. + * + * The Original Code and all software distributed under the License are + * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, - * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the - * License for the specific language governing rights and limitations - * under the License. + * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. + * Please see the License for the specific language governing rights and + * limitations under the License. * - * @APPLE_LICENSE_HEADER_END@ + * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /* * @OSF_COPYRIGHT@ @@ -48,9 +54,6 @@ * the rights to redistribute these changes. */ -/* - */ - #ifndef _I386_FPU_H_ #define _I386_FPU_H_ @@ -58,12 +61,36 @@ * Macro definitions for routines to manipulate the * floating-point processor. */ - -#include +#include #include #include #include #include +#include + +extern int fp_kind; + +extern void init_fpu(void); +extern void fpu_module_init(void); +extern void fpu_free( + struct x86_fpsave_state * fps); +extern kern_return_t fpu_set_fxstate( + thread_t thr_act, + thread_state_t state); +extern kern_return_t fpu_get_fxstate( + thread_t thr_act, + thread_state_t state); +extern void fpu_dup_fxstate( + thread_t parent, + thread_t child); +extern void fpnoextflt(void); +extern void fpextovrflt(void); +extern void fpexterrflt(void); +extern void fpSSEexterrflt(void); +extern void fpflush(thread_t); +extern void fp_setvalid(boolean_t); +extern void fxsave64(struct x86_fx_save *); +extern void fxrstor64(struct x86_fx_save *); /* * FPU instructions. @@ -77,9 +104,8 @@ #define fldcw(control) \ __asm__ volatile("fldcw %0" : : "m" (*(unsigned short *) &(control)) ) -extern unsigned short fnstsw(void); - -extern __inline__ unsigned short fnstsw(void) +static inline unsigned short +fnstsw(void) { unsigned short status; __asm__ volatile("fnstsw %0" : "=ma" (status)); @@ -103,58 +129,46 @@ extern __inline__ unsigned short fnstsw(void) #define FXSAFE() (fp_kind == FP_FXSR) -#define fpu_load_context(pcb) + +static inline void clear_fpu(void) +{ + set_ts(); +} /* * Save thread`s FPU context. - * If only one CPU, we just set the task-switched bit, - * to keep the new thread from using the coprocessor. - * If multiple CPUs, we save the entire state. - * NOTE: in order to provide backwards compatible support in the kernel. When saving SSE2 state, we also save the - * FP state in it's old location. Otherwise fpu_get_state() and fpu_set_state() will stop working */ -#define fpu_save_context(thread) \ - { \ - register struct i386_fpsave_state *ifps; \ - ifps = (thread)->machine.pcb->ims.ifps; \ - if (ifps != 0 && !ifps->fp_valid) { \ - /* registers are in FPU - save to memory */ \ - ifps->fp_valid = TRUE; \ - ifps->fp_save_flavor = FP_387; \ - if (FXSAFE()) { \ - fxsave(&ifps->fx_save_state); \ - ifps->fp_save_flavor = FP_FXSR; \ - } \ - fnsave(&ifps->fp_save_state); \ - } \ - set_ts(); \ - } - - - -extern int fp_kind; -extern void init_fpu(void); -extern void fpu_module_init(void); -extern void fpu_free( - struct i386_fpsave_state * fps); -extern kern_return_t fpu_set_state( - thread_t thr_act, - struct i386_float_state * st); -extern kern_return_t fpu_get_state( - thread_t thr_act, - struct i386_float_state * st); -extern kern_return_t fpu_set_fxstate( - thread_t thr_act, - struct i386_float_state * st); -extern kern_return_t fpu_get_fxstate( - thread_t thr_act, - struct i386_float_state * st); -extern void fpnoextflt(void); -extern void fpextovrflt(void); -extern void fpexterrflt(void); -extern void fp_state_alloc(void); -extern void fpintr(void); -extern void fpflush(thread_t); +static inline void fpu_save_context(thread_t thread) +{ + struct x86_fpsave_state *ifps; + + assert(ml_get_interrupts_enabled() == FALSE); + ifps = (thread)->machine.pcb->ifps; + if (ifps != 0 && !ifps->fp_valid) { + /* Clear CR0.TS in preparation for the FP context save. In + * theory, this shouldn't be necessary since a live FPU should + * indicate that TS is clear. However, various routines + * (such as sendsig & sigreturn) manipulate TS directly. + */ + clear_ts(); + /* registers are in FPU - save to memory */ + ifps->fp_valid = TRUE; + + if (!thread_is_64bit(thread) || is_saved_state32(thread->machine.pcb->iss)) { + /* save the compatibility/legacy mode XMM+x87 state */ + fxsave(&ifps->fx_save_state); + ifps->fp_save_layout = FXSAVE32; + } + else { + /* Execute a brief jump to 64-bit mode to save the 64 + * bit state + */ + fxsave64(&ifps->fx_save_state); + ifps->fp_save_layout = FXSAVE64; + } + } + set_ts(); +} #endif /* _I386_FPU_H_ */