Subversion Repositories planix.SVN

/*
 *      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