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/*
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 *	mips user level lock code
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 */
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#define	LL(base, rt)	WORD	$((060<<26)|((base)<<21)|((rt)<<16))
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#define	SC(base, rt)	WORD	$((070<<26)|((base)<<21)|((rt)<<16))
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#define	NOOP		WORD	$0x27
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#define COP3		WORD	$(023<<26)
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	TEXT	C_3ktas(SB),$0
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	MOVW	R1, R21
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btas:
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	MOVW	R21, R1
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	MOVB	R0, 1(R1)
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	NOOP
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	COP3
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	BLTZ	R1, btas
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	RET
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	TEXT	_tas(SB), $0
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	TEXT	C_4ktas(SB), $0
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	MOVW	R1, R2		/* address of key */
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tas1:
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	MOVW	$1, R3
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	LL(2, 1)
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	NOOP
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	SC(2, 3)
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	NOOP
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	BEQ	R3, tas1
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	RET