/* * include/asm-v850/system.h -- Low-level interrupt/thread ops * *  Copyright (C) 2001,02,03  NEC Electronics Corporation *  Copyright (C) 2001,02,03  Miles Bader <miles@gnu.org> * * This file is subject to the terms and conditions of the GNU General * Public License.  See the file COPYING in the main directory of this * archive for more details. * * Written by Miles Bader <miles@gnu.org> */ #ifndef __V850_SYSTEM_H__#define __V850_SYSTEM_H__ #include <linux/linkage.h>#include <asm/ptrace.h>  /* * switch_to(n) should switch tasks to task ptr, first checking that * ptr isn't the current task, in which case it does nothing. */struct thread_struct;extern void *switch_thread (struct thread_struct *last,			    struct thread_struct *next);#define switch_to(prev,next,last)					      \  do {									      \        if (prev != next) {						      \ 		(last) = switch_thread (&prev->thread, &next->thread);	      \	}								      \  } while (0)  /* Enable/disable interrupts.  */#define local_irq_enable()	__asm__ __volatile__ ("ei")#define local_irq_disable()	__asm__ __volatile__ ("di") #define local_save_flags(flags) \  __asm__ __volatile__ ("stsr %1, %0" : "=r" (flags) : "i" (SR_PSW))#define local_restore_flags(flags) \  __asm__ __volatile__ ("ldsr %0, %1" :: "r" (flags), "i" (SR_PSW)) /* For spinlocks etc */#define	local_irq_save(flags) \  do { local_save_flags (flags); local_irq_disable (); } while (0) #define local_irq_restore(flags) \  local_restore_flags (flags);  static inline int irqs_disabled (void){	unsigned flags;	local_save_flags (flags);	return !!(flags & 0x20);}  /* * Force strict CPU ordering. * Not really required on v850... */#define nop()			__asm__ __volatile__ ("nop")#define mb()			__asm__ __volatile__ ("" ::: "memory")#define rmb()			mb ()#define wmb()			mb ()#define read_barrier_depends()	((void)0)#define set_rmb(var, value)	do { xchg (&var, value); } while (0)#define set_mb(var, value)	set_rmb (var, value)#define set_wmb(var, value)	do { var = value; wmb (); } while (0) #define smp_mb()	mb ()#define smp_rmb()	rmb ()#define smp_wmb()	wmb ()#define smp_read_barrier_depends()	read_barrier_depends() #define xchg(ptr, with) \  ((__typeof__ (*(ptr)))__xchg ((unsigned long)(with), (ptr), sizeof (*(ptr))))#define tas(ptr) (xchg ((ptr), 1)) static inline unsigned long __xchg (unsigned long with,				    __volatile__ void *ptr, int size){	unsigned long tmp, flags; 	local_irq_save (flags); 	switch (size) {	case 1:		tmp = *(unsigned char *)ptr;		*(unsigned char *)ptr = with;		break;	case 2:		tmp = *(unsigned short *)ptr;		*(unsigned short *)ptr = with;		break;	case 4:		tmp = *(unsigned long *)ptr;		*(unsigned long *)ptr = with;		break;	} 	local_irq_restore (flags); 	return tmp;} #define arch_align_stack(x) (x) #endif /* __V850_SYSTEM_H__ */