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/*
 * Copyright (C) 1999		Keith Adams	<kma@cse.ogi.edu>
 * 				Oregon Graduate Institute
 */
#ifndef _I960_SYSTEM_H
#define _I960_SYSTEM_H
 
#include <linux/linkage.h>
 
asmlinkage void resume(void);
struct task_struct;
extern void switch_to(struct task_struct* prev, struct task_struct* next);
 
 
#define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
#define tas(ptr) (xchg((ptr),1))
 
#define cli() do { \
	int garbage; \
	__asm__ __volatile__("modpc	g0, %1, %1"	\
			     :"=r" (garbage)	\
			     : "0" (0x1f << 16)); \
} while (0)
 
#define sti() do { \
	int garbage;	\
	__asm__ __volatile__("modpc	g0, %1, %2"	\
			     : "=r" (garbage)	\
			     : "r" (0x1f << 16), "0" (0));	\
} while (0)
 
#define save_flags(flags) do { \
	__asm__ __volatile__ ("modpc	g0, 0, %0" :"=&r" (flags));	\
} while (0)
 
#define restore_flags(flags) do { \
	int	flagcpy=flags;	\
	__asm__ __volatile__ ("modpc	g0, %1, %2" \
			      : "=r"(flagcpy) \
			      : "r" (0xffffffff), "0" (flagcpy)); \
} while (0)
 
extern unsigned long atmod(volatile void* ptr, unsigned long mask, unsigned long val);
 
static inline unsigned long __xchg(unsigned long x, 
				   volatile void * ptr, int size)
{
	unsigned long mask, retval;
	int off;
 
	switch (size) {
		case 1:
			mask = 0xff;
			off = (long) ptr % 4;
			mask <<= off * 8;
			x <<= off * 8;
			retval = atmod(ptr, mask, x);
			break;
 
		case 2:
			mask = 0xffff;
			off = (long)ptr % 2;
			mask <<= off * 16;
			x <<= off * 16;
			retval = atmod(ptr, mask, x);	
			break;
 
		case 4:
			mask = 0xffffffff;
			retval = atmod(ptr, mask, x);
			break;
	}
	return retval;
}
 
#endif /* _I960_SYSTEM_H */