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typedef struct Tos Tos;
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typedef struct Plink Plink;
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#pragma incomplete Plink
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struct Tos {
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	struct			/* Per process profiling */
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	{
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		Plink	*pp;	/* known to be 0(ptr) */
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		Plink	*next;	/* known to be 4(ptr) */
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		Plink	*last;
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		Plink	*first;
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		ulong	pid;
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		ulong	what;
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	} prof;
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	uvlong	cyclefreq;	/* cycle clock frequency if there is one, 0 otherwise */
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	vlong	kcycles;	/* cycles spent in kernel */
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	vlong	pcycles;	/* cycles spent in process (kernel + user) */
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	ulong	pid;		/* might as well put the pid here */
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	ulong	clock;
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	/* scratch space for kernel use (e.g., mips fp delay-slot execution) */
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	ulong	kscr[4];
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	/* top of stack is here */
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};
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extern Tos *_tos;