system.h

嵌入式系统设计与实验教材二源码linux内核移植与编译

		: "=r"(__r16), "=r"(__r17), "=r"(__r0)		\
		: "i"(PAL_ ## NAME), "0"(__r16), "1"(__r17)	\
		: "$1", "$22", "$23", "$24", "$25");		\
	return __r0;						\
}

__CALL_PAL_W1(cflush, unsigned long);
__CALL_PAL_R0(rdmces, unsigned long);
__CALL_PAL_R0(rdps, unsigned long);
__CALL_PAL_R0(rdusp, unsigned long);
__CALL_PAL_RW1(swpipl, unsigned long, unsigned long);
__CALL_PAL_R0(whami, unsigned long);
__CALL_PAL_W2(wrent, void*, unsigned long);
__CALL_PAL_W1(wripir, unsigned long);
__CALL_PAL_W1(wrkgp, unsigned long);
__CALL_PAL_W1(wrmces, unsigned long);
__CALL_PAL_RW2(wrperfmon, unsigned long, unsigned long, unsigned long);
__CALL_PAL_W1(wrusp, unsigned long);
__CALL_PAL_W1(wrvptptr, unsigned long);

#define IPL_MIN		0
#define IPL_SW0		1
#define IPL_SW1		2
#define IPL_DEV0	3
#define IPL_DEV1	4
#define IPL_TIMER	5
#define IPL_PERF	6
#define IPL_POWERFAIL	6
#define IPL_MCHECK	7
#define IPL_MAX		7

#ifdef CONFIG_ALPHA_BROKEN_IRQ_MASK
#undef IPL_MIN
#define IPL_MIN		__min_ipl
extern int __min_ipl;
#endif

#define getipl()		(rdps() & 7)
#define setipl(ipl)		((void) swpipl(ipl))

#define __cli()			do { setipl(IPL_MAX); barrier(); } while(0)
#define __sti()			do { barrier(); setipl(IPL_MIN); } while(0)
#define __save_flags(flags)	((flags) = rdps())
#define __save_and_cli(flags)	do { (flags) = swpipl(IPL_MAX); barrier(); } while(0)
#define __restore_flags(flags)	do { barrier(); setipl(flags); barrier(); } while(0)

#define local_irq_save(flags)		__save_and_cli(flags)
#define local_irq_restore(flags)	__restore_flags(flags)
#define local_irq_disable()		__cli()
#define local_irq_enable()		__sti()

#ifdef CONFIG_SMP

extern int global_irq_holder;

#define save_and_cli(flags)     (save_flags(flags), cli())

extern void __global_cli(void);
extern void __global_sti(void);
extern unsigned long __global_save_flags(void);
extern void __global_restore_flags(unsigned long flags);

#define cli()                   __global_cli()
#define sti()                   __global_sti()
#define save_flags(flags)	((flags) = __global_save_flags())
#define restore_flags(flags)    __global_restore_flags(flags)

#else /* CONFIG_SMP */

#define cli()			__cli()
#define sti()			__sti()
#define save_flags(flags)	__save_flags(flags)
#define save_and_cli(flags)	__save_and_cli(flags)
#define restore_flags(flags)	__restore_flags(flags)

#endif /* CONFIG_SMP */

/*
 * TB routines..
 */
#define __tbi(nr,arg,arg1...)					\
({								\
	register unsigned long __r16 __asm__("$16") = (nr);	\
	register unsigned long __r17 __asm__("$17"); arg;	\
	__asm__ __volatile__(					\
		"call_pal %3 #__tbi"				\
		:"=r" (__r16),"=r" (__r17)			\
		:"0" (__r16),"i" (PAL_tbi) ,##arg1		\
		:"$0", "$1", "$22", "$23", "$24", "$25");	\
})

#define tbi(x,y)	__tbi(x,__r17=(y),"1" (__r17))
#define tbisi(x)	__tbi(1,__r17=(x),"1" (__r17))
#define tbisd(x)	__tbi(2,__r17=(x),"1" (__r17))
#define tbis(x)		__tbi(3,__r17=(x),"1" (__r17))
#define tbiap()		__tbi(-1, /* no second argument */)
#define tbia()		__tbi(-2, /* no second argument */)

/*
 * Atomic exchange.
 * Since it can be used to implement critical sections
 * it must clobber "memory" (also for interrupts in UP).
 */

extern __inline__ unsigned long
__xchg_u32(volatile int *m, unsigned long val)
{
	unsigned long dummy;

	__asm__ __volatile__(
	"1:	ldl_l %0,%4\n"
	"	bis $31,%3,%1\n"
	"	stl_c %1,%2\n"
	"	beq %1,2f\n"
#ifdef CONFIG_SMP
	"	mb\n"
#endif
	".subsection 2\n"
	"2:	br 1b\n"
	".previous"
	: "=&r" (val), "=&r" (dummy), "=m" (*m)
	: "rI" (val), "m" (*m) : "memory");

	return val;
}

extern __inline__ unsigned long
__xchg_u64(volatile long *m, unsigned long val)
{
	unsigned long dummy;

	__asm__ __volatile__(
	"1:	ldq_l %0,%4\n"
	"	bis $31,%3,%1\n"
	"	stq_c %1,%2\n"
	"	beq %1,2f\n"
#ifdef CONFIG_SMP
	"	mb\n"
#endif
	".subsection 2\n"
	"2:	br 1b\n"
	".previous"
	: "=&r" (val), "=&r" (dummy), "=m" (*m)
	: "rI" (val), "m" (*m) : "memory");

	return val;
}

/* This function doesn't exist, so you'll get a linker error
   if something tries to do an invalid xchg().  */
extern void __xchg_called_with_bad_pointer(void);

static __inline__ unsigned long
__xchg(volatile void *ptr, unsigned long x, int size)
{
	switch (size) {
		case 4:
			return __xchg_u32(ptr, x);
		case 8:
			return __xchg_u64(ptr, x);
	}
	__xchg_called_with_bad_pointer();
	return x;
}

#define xchg(ptr,x)							     \
  ({									     \
     __typeof__(*(ptr)) _x_ = (x);					     \
     (__typeof__(*(ptr))) __xchg((ptr), (unsigned long)_x_, sizeof(*(ptr))); \
  })

#define tas(ptr) (xchg((ptr),1))


/* 
 * Atomic compare and exchange.  Compare OLD with MEM, if identical,
 * store NEW in MEM.  Return the initial value in MEM.  Success is
 * indicated by comparing RETURN with OLD.
 *
 * The memory barrier should be placed in SMP only when we actually
 * make the change. If we don't change anything (so if the returned
 * prev is equal to old) then we aren't acquiring anything new and
 * we don't need any memory barrier as far I can tell.
 */

#define __HAVE_ARCH_CMPXCHG 1

extern __inline__ unsigned long
__cmpxchg_u32(volatile int *m, int old, int new)
{
	unsigned long prev, cmp;

	__asm__ __volatile__(
	"1:	ldl_l %0,%5\n"
	"	cmpeq %0,%3,%1\n"
	"	beq %1,2f\n"
	"	mov %4,%1\n"
	"	stl_c %1,%2\n"
	"	beq %1,3f\n"
#ifdef CONFIG_SMP
	"	mb\n"
#endif
	"2:\n"
	".subsection 2\n"
	"3:	br 1b\n"
	".previous"
	: "=&r"(prev), "=&r"(cmp), "=m"(*m)
	: "r"((long) old), "r"(new), "m"(*m) : "memory");

	return prev;
}

extern __inline__ unsigned long
__cmpxchg_u64(volatile long *m, unsigned long old, unsigned long new)
{
	unsigned long prev, cmp;

	__asm__ __volatile__(
	"1:	ldq_l %0,%5\n"
	"	cmpeq %0,%3,%1\n"
	"	beq %1,2f\n"
	"	mov %4,%1\n"
	"	stq_c %1,%2\n"
	"	beq %1,3f\n"
#ifdef CONFIG_SMP
	"	mb\n"
#endif
	"2:\n"
	".subsection 2\n"
	"3:	br 1b\n"
	".previous"
	: "=&r"(prev), "=&r"(cmp), "=m"(*m)
	: "r"((long) old), "r"(new), "m"(*m) : "memory");

	return prev;
}

/* This function doesn't exist, so you'll get a linker error
   if something tries to do an invalid cmpxchg().  */
extern void __cmpxchg_called_with_bad_pointer(void);

static __inline__ unsigned long
__cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, int size)
{
	switch (size) {
		case 4:
			return __cmpxchg_u32(ptr, old, new);
		case 8:
			return __cmpxchg_u64(ptr, old, new);
	}
	__cmpxchg_called_with_bad_pointer();
	return old;
}

#define cmpxchg(ptr,o,n)						 \
  ({									 \
     __typeof__(*(ptr)) _o_ = (o);					 \
     __typeof__(*(ptr)) _n_ = (n);					 \
     (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_,		 \
				    (unsigned long)_n_, sizeof(*(ptr))); \
  })

#endif /* __ASSEMBLY__ */

#endif