#ifndef _H8300_SYSTEM_H#define _H8300_SYSTEM_H #include <linux/linkage.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.  This * also clears the TS-flag if the task we switched to has used the * math co-processor latest. *//* * switch_to() saves the extra registers, that are not saved * automatically by SAVE_SWITCH_STACK in resume(), ie. d0-d5 and * a0-a1. Some of these are used by schedule() and its predecessors * and so we might get see unexpected behaviors when a task returns * with unexpected register values. * * syscall stores these registers itself and none of them are used * by syscall after the function in the syscall has been called. * * Beware that resume now expects *next to be in d1 and the offset of * tss to be in a1. This saves a few instructions as we no longer have * to push them onto the stack and read them back right after. * * 02/17/96 - Jes Sorensen (jds@kom.auc.dk) * * Changed 96/09/19 by Andreas Schwab * pass prev in a0, next in a1, offset of tss in d1, and whether * the mm structures are shared in d2 (to avoid atc flushing). * * H8/300 Porting 2002/09/04 Yoshinori Sato */ asmlinkage void resume(void);#define switch_to(prev,next,last) {                         \  void *_last;						    \  __asm__ __volatile__(					    \  			"mov.l	%1, er0\n\t"		    \			"mov.l	%2, er1\n\t"		    \                        "mov.l  %3, er2\n\t"                \			"jsr @_resume\n\t"                  \                        "mov.l  er2,%0\n\t"                 \		       : "=r" (_last)			    \		       : "r" (&(prev->thread)),		    \			 "r" (&(next->thread)),		    \                         "g" (prev)                         \		       : "cc", "er0", "er1", "er2", "er3"); \  (last) = _last; 					    \} #define __sti() asm volatile ("andc #0x7f,ccr")#define __cli() asm volatile ("orc  #0x80,ccr") #define __save_flags(x) \       asm volatile ("stc ccr,%w0":"=r" (x)) #define __restore_flags(x) \       asm volatile ("ldc %w0,ccr": :"r" (x)) #define	irqs_disabled()			\({					\	unsigned char flags;		\	__save_flags(flags);	        \	((flags & 0x80) == 0x80);	\}) #define iret() __asm__ __volatile__ ("rte": : :"memory", "sp", "cc") /* For spinlocks etc */#define local_irq_disable()	__cli()#define local_irq_enable()      __sti()#define local_irq_save(x)	({ __save_flags(x); local_irq_disable(); })#define local_irq_restore(x)	__restore_flags(x)#define local_save_flags(x)     __save_flags(x) /* * Force strict CPU ordering. * Not really required on H8... */#define nop()  asm volatile ("nop"::)#define mb()   asm volatile (""   : : :"memory")#define rmb()  asm volatile (""   : : :"memory")#define wmb()  asm volatile (""   : : :"memory")#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) #ifdef CONFIG_SMP#define smp_mb()	mb()#define smp_rmb()	rmb()#define smp_wmb()	wmb()#define smp_read_barrier_depends()	read_barrier_depends()#else#define smp_mb()	barrier()#define smp_rmb()	barrier()#define smp_wmb()	barrier()#define smp_read_barrier_depends()	do { } while(0)#endif #define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))#define tas(ptr) (xchg((ptr),1)) struct __xchg_dummy { unsigned long a[100]; };#define __xg(x) ((volatile struct __xchg_dummy *)(x)) static inline unsigned long __xchg(unsigned long x, volatile void * ptr, int size){  unsigned long tmp, flags;   local_irq_save(flags);   switch (size) {  case 1:    __asm__ __volatile__    ("mov.b %2,%0\n\t"     "mov.b %1,%2"    : "=&r" (tmp) : "r" (x), "m" (*__xg(ptr)) : "memory");    break;  case 2:    __asm__ __volatile__    ("mov.w %2,%0\n\t"     "mov.w %1,%2"    : "=&r" (tmp) : "r" (x), "m" (*__xg(ptr)) : "memory");    break;  case 4:    __asm__ __volatile__    ("mov.l %2,%0\n\t"     "mov.l %1,%2"    : "=&r" (tmp) : "r" (x), "m" (*__xg(ptr)) : "memory");    break;  default:    tmp = 0;	    }  local_irq_restore(flags);  return tmp;} #define HARD_RESET_NOW() ({		\        local_irq_disable();		\        asm("jmp @@0");			\}) #define arch_align_stack(x) (x) #endif /* _H8300_SYSTEM_H */