/* * mips user level lock code */ #define LL(base, rt) WORD $((060<<26)|((base)<<21)|((rt)<<16))#define SC(base, rt) WORD $((070<<26)|((base)<<21)|((rt)<<16))#define NOOP WORD $0x27#define COP3 WORD $(023<<26) TEXT C_3ktas(SB),$0 MOVW R1, R21btas: MOVW R21, R1 MOVB R0, 1(R1) NOOP COP3 BLTZ R1, btas RET TEXT _tas(SB), $0 TEXT C_4ktas(SB), $0 MOVW R1, R2 /* address of key */tas1: MOVW $1, R3 LL(2, 1) NOOP SC(2, 3) NOOP BEQ R3, tas1 RET
/*
* mips user level lock code
*/
#define LL(base, rt) WORD $((060<<26)|((base)<<21)|((rt)<<16))
#define SC(base, rt) WORD $((070<<26)|((base)<<21)|((rt)<<16))
#define NOOP WORD $0x27
#define COP3 WORD $(023<<26)
TEXT C_3ktas(SB),$0
MOVW R1, R21
btas:
MOVW R21, R1
MOVB R0, 1(R1)
NOOP
COP3
BLTZ R1, btas
RET
TEXT _tas(SB), $0
TEXT C_4ktas(SB), $0
MOVW R1, R2 /* address of key */
tas1:
MOVW $1, R3
LL(2, 1)
NOOP
SC(2, 3)
NOOP
BEQ R3, tas1
RET