xnu-1456.1.26.tar.gz

[apple/xnu.git] / osfmk / i386 / fpu.h

diff --git a/osfmk/i386/fpu.h b/osfmk/i386/fpu.h
index 7979b66fa89c619a41f5d20b46b62477f447bb61..7b6f86a826fed74c55d39010f9671c42067a420d 100644 (file)
--- a/osfmk/i386/fpu.h
+++ b/osfmk/i386/fpu.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2006 Apple Computer, Inc. All rights reserved.
  *
  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
  * 
@@ -54,9 +54,6 @@
  * the rights to redistribute these changes.
  */
 
-/*
- */
-
 #ifndef        _I386_FPU_H_
 #define        _I386_FPU_H_
 
@@ -65,11 +62,11 @@
  * floating-point processor.
  */
 #include <kern/thread.h>
-#include <i386/thread.h>
 #include <kern/kern_types.h>
 #include <mach/i386/kern_return.h>
 #include <mach/i386/thread_status.h>
 #include <i386/proc_reg.h>
+#include <i386/thread.h>
 
 extern int             fp_kind;
 
@@ -92,8 +89,10 @@ extern void          fpexterrflt(void);
 extern void            fpSSEexterrflt(void);
 extern void            fpflush(thread_t);
 extern void            fp_setvalid(boolean_t);
+#ifdef __i386__
 extern void            fxsave64(struct x86_fx_save *);
 extern void            fxrstor64(struct x86_fx_save *);
+#endif
 
 /*
  * FPU instructions.
@@ -107,9 +106,8 @@ extern void         fxrstor64(struct x86_fx_save *);
 #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));
@@ -139,6 +137,7 @@ static inline void clear_fpu(void)
        set_ts();
 }
 
+
 /*
  * Save thread`s FPU context.
  */
@@ -158,6 +157,8 @@ static inline void fpu_save_context(thread_t thread)
                clear_ts();
                /* registers are in FPU - save to memory */
                ifps->fp_valid = TRUE;
+
+#if defined(__i386__)
                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);
@@ -170,6 +171,13 @@ static inline void fpu_save_context(thread_t thread)
                        fxsave64(&ifps->fx_save_state);
                        ifps->fp_save_layout = FXSAVE64;
                }
+#elif defined(__x86_64__)
+               /* for a 64-bit long mode kernel, we can always use plain fxsave */
+               fxsave(&ifps->fx_save_state);
+               ifps->fp_save_layout = thread_is_64bit(thread) ? FXSAVE64
+                       : FXSAVE32;
+
+#endif
        }
        set_ts();
 }