litmus-rt.git - The LITMUS^RT kernel.

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The LITMUS^RT kernel.

Bjoern Brandenburg

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path: root/tools/perf/util/thread_map.h

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#define kernel_fpu_end() do { stts(); preempt_enable(); } while(0) /* We need a safe address that is cheap to find and that is already in L1 during context switch. The best choices are unfortunately different for UP and SMP */ #ifdef CONFIG_SMP #define safe_address (__per_cpu_offset[0]) #else #define safe_address (kstat_cpu(0).cpustat.user) #endif /* * These must be called with preempt disabled */ static inline void __save_init_fpu( struct task_struct *tsk ) { /* Use more nops than strictly needed in case the compiler varies code */ alternative_input( "fnsave %[fx] ;fwait;" GENERIC_NOP8 GENERIC_NOP4, "fxsave %[fx]\n" "bt $7,%[fsw] ; jnc 1f ; fnclex\n1:", X86_FEATURE_FXSR, [fx] "m" (tsk->thread.i387.fxsave), [fsw] "m" (tsk->thread.i387.fxsave.swd) : "memory"); /* AMD K7/K8 CPUs don't save/restore FDP/FIP/FOP unless an exception is pending. Clear the x87 state here by setting it to fixed values. safe_address is a random variable that should be in L1 */ alternative_input( GENERIC_NOP8 GENERIC_NOP2, "emms\n\t" /* clear stack tags */ "fildl %[addr]", /* set F?P to defined value */ X86_FEATURE_FXSAVE_LEAK, [addr] "m" (safe_address)); task_thread_info(tsk)->status &= ~TS_USEDFPU; } #define __unlazy_fpu( tsk ) do { \ if (task_thread_info(tsk)->status & TS_USEDFPU) { \ __save_init_fpu(tsk); \ stts(); \ } else \ tsk->fpu_counter = 0; \ } while (0) #define __clear_fpu( tsk ) \ do { \ if (task_thread_info(tsk)->status & TS_USEDFPU) { \ asm volatile("fnclex ; fwait"); \ task_thread_info(tsk)->status &= ~TS_USEDFPU; \ stts(); \ } \ } while (0) /* * These disable preemption on their own and are safe */ static inline void save_init_fpu( struct task_struct *tsk ) { preempt_disable(); __save_init_fpu(tsk); stts(); preempt_enable(); } #define unlazy_fpu( tsk ) do { \ preempt_disable(); \ __unlazy_fpu(tsk); \ preempt_enable(); \ } while (0) #define clear_fpu( tsk ) do { \ preempt_disable(); \ __clear_fpu( tsk ); \ preempt_enable(); \ } while (0) /* * FPU state interaction... */ extern unsigned short get_fpu_cwd( struct task_struct *tsk ); extern unsigned short get_fpu_swd( struct task_struct *tsk ); extern unsigned short get_fpu_mxcsr( struct task_struct *tsk ); extern asmlinkage void math_state_restore(void); /* * Signal frame handlers... */ extern int save_i387( struct _fpstate __user *buf ); extern int restore_i387( struct _fpstate __user *buf ); /* * ptrace request handers... */ extern int get_fpregs( struct user_i387_struct __user *buf, struct task_struct *tsk ); extern int set_fpregs( struct task_struct *tsk, struct user_i387_struct __user *buf ); extern int get_fpxregs( struct user_fxsr_struct __user *buf, struct task_struct *tsk ); extern int set_fpxregs( struct task_struct *tsk, struct user_fxsr_struct __user *buf ); /* * FPU state for core dumps... */ extern int dump_fpu( struct pt_regs *regs, struct user_i387_struct *fpu ); #endif /* __ASM_I386_I387_H */


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