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#ifndef __ASM_CRIS_SYSTEM_H
#define __ASM_CRIS_SYSTEM_H
#include <linux/config.h>
#include <asm/segment.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 prepare_to_switch() do { } while(0)
#define switch_to(prev,next,last) last = resume(prev,next, \
(int)&((struct task_struct *)0)->thread)
/* read the CPU version register */
static inline unsigned long rdvr(void) {
unsigned char vr;
__asm__ volatile ("move $vr,%0" : "=rm" (vr));
return vr;
}
/* read/write the user-mode stackpointer */
static inline unsigned long rdusp(void) {
unsigned long usp;
__asm__ __volatile__("move $usp,%0" : "=rm" (usp));
return usp;
}
#define wrusp(usp) \
__asm__ __volatile__("move %0,$usp" : /* no outputs */ : "rm" (usp))
/* read the current stackpointer */
static inline unsigned long rdsp(void) {
unsigned long sp;
__asm__ __volatile__("move.d $sp,%0" : "=rm" (sp));
return sp;
}
static inline unsigned long _get_base(char * addr)
{
return 0;
}
#define nop() __asm__ __volatile__ ("nop");
#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) ((struct __xchg_dummy *)(x))
#if 0
/* use these and an oscilloscope to see the fraction of time we're running with IRQ's disabled */
/* it assumes the LED's are on port 0x90000000 of course. */
#define sti() __asm__ __volatile__ ( "ei\n\tpush $r0\n\tmoveq 0,$r0\n\tmove.d $r0,[0x90000000]\n\tpop $r0" );
#define cli() __asm__ __volatile__ ( "di\n\tpush $r0\n\tmove.d 0x40000,$r0\n\tmove.d $r0,[0x90000000]\n\tpop $r0");
#define save_flags(x) __asm__ __volatile__ ("move $ccr,%0" : "=rm" (x) : : "memory");
#define restore_flags(x) __asm__ __volatile__ ("move %0,$ccr\n\tbtstq 5,%0\n\tbpl 1f\n\tnop\n\tpush $r0\n\tmoveq 0,$r0\n\tmove.d $r0,[0x90000000]\n\tpop $r0\n1:\n" : : "r" (x) : "memory");
#else
#define __cli() __asm__ __volatile__ ( "di");
#define __sti() __asm__ __volatile__ ( "ei" );
#define __save_flags(x) __asm__ __volatile__ ("move $ccr,%0" : "=rm" (x) : : "memory");
#define __restore_flags(x) __asm__ __volatile__ ("move %0,$ccr" : : "rm" (x) : "memory");
/* For spinlocks etc */
#define local_irq_save(x) __asm__ __volatile__ ("move $ccr,%0\n\tdi" : "=rm" (x) : : "memory");
#define local_irq_restore(x) restore_flags(x)
#define local_irq_disable() cli()
#define local_irq_enable() sti()
#endif
#define cli() __cli()
#define sti() __sti()
#define save_flags(x) __save_flags(x)
#define restore_flags(x) __restore_flags(x)
#define save_and_cli(x) do { __save_flags(x); cli(); } while(0)
static inline unsigned long __xchg(unsigned long x, 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 */
#if 0
unsigned int flags;
save_flags(flags); /* save flags, including irq enable bit */
cli(); /* shut off irq's */
switch (size) {
case 1:
__asm__ __volatile__ (
"move.b %0,r0\n\t"
"move.b %1,%0\n\t"
"move.b r0,%1\n\t"
: "=r" (x)
: "m" (*__xg(ptr)), "r" (x)
: "memory","r0");
break;
case 2:
__asm__ __volatile__ (
"move.w %0,r0\n\t"
"move.w %1,%0\n\t"
"move.w r0,%1\n\t"
: "=r" (x)
: "m" (*__xg(ptr)), "r" (x)
: "memory","r0");
break;
case 4:
__asm__ __volatile__ (
"move.d %0,r0\n\t"
"move.d %1,%0\n\t"
"move.d r0,%1\n\t"
: "=r" (x)
: "m" (*__xg(ptr)), "r" (x)
: "memory","r0");
break;
}
restore_flags(flags); /* restore irq enable bit */
return x;
#else
unsigned long flags,temp;
save_flags(flags); /* save flags, including irq enable bit */
cli(); /* shut off irq's */
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;
}
restore_flags(flags); /* restore irq enable bit */
return x;
#endif
}
#define mb() __asm__ __volatile__ ("" : : : "memory")
#define rmb() mb()
#define wmb() mb()
#ifdef CONFIG_SMP
#define smp_mb() mb()
#define smp_rmb() rmb()
#define smp_wmb() wmb()
#else
#define smp_mb() barrier()
#define smp_rmb() barrier()
#define smp_wmb() barrier()
#endif
#define iret()
/*
* disable hlt during certain critical i/o operations
*/
#define HAVE_DISABLE_HLT
void disable_hlt(void);
void enable_hlt(void);
#endif
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