74 lines
1.9 KiB
C
74 lines
1.9 KiB
C
#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;
|
|
}
|
|
|
|
#define arch_align_stack(x) (x)
|
|
|
|
void default_idle(void);
|
|
|
|
#endif
|