#ifndef __ASM_CRIS_SYSTEM_H #define __ASM_CRIS_SYSTEM_H #include <asm/arch/system.h> /* the switch_to macro calls resume, an asm function in entry.S which does the actual * task switching. */ extern struct task_struct *resume(struct task_struct *prev, struct task_struct *next, int); #define switch_to(prev,next,last) last = resume(prev,next, \ (int)&((struct task_struct *)0)->thread) #define barrier() __asm__ __volatile__("": : :"memory") #define mb() barrier() #define rmb() mb() #define wmb() mb() #define read_barrier_depends() do { } while(0) #define set_mb(var, value) do { var = value; mb(); } 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 iret() /* * disable hlt during certain critical i/o operations */ #define HAVE_DISABLE_HLT void disable_hlt(void); void enable_hlt(void); static inline unsigned long __xchg(unsigned long x, volatile void * ptr, int size) { /* since Etrax doesn't have any atomic xchg instructions, we need to disable irq's (if enabled) and do it with move.d's */ unsigned long flags,temp; local_irq_save(flags); /* save flags, including irq enable bit and shut off irqs */ switch (size) { case 1: *((unsigned char *)&temp) = x; x = *(unsigned char *)ptr; *(unsigned char *)ptr = *((unsigned char *)&temp); break; case 2: *((unsigned short *)&temp) = x; x = *(unsigned short *)ptr; *(unsigned short *)ptr = *((unsigned short *)&temp); break; case 4: temp = x; x = *(unsigned long *)ptr; *(unsigned long *)ptr = temp; break; } local_irq_restore(flags); /* restore irq enable bit */ return x; } #include <asm-generic/cmpxchg-local.h> /* * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make * them available. */ #define cmpxchg_local(ptr, o, n) \ ((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr), (unsigned long)(o),\ (unsigned long)(n), sizeof(*(ptr)))) #define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n)) #ifndef CONFIG_SMP #include <asm-generic/cmpxchg.h> #endif #define arch_align_stack(x) (x) void default_idle(void); #endif