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TEXT    tas(SB), $0
        SYNC
        MOVW    R3, R4
        MOVW    $0xdeaddead,R5
tas1:
        DCBF    (R4)    /* fix for 603x bug */
        LWAR    (R4), R3
        CMP     R3, $0
        BNE     tas0
        DCBT    (R4)                            /* fix 405 errata cpu_210 */
        STWCCC  R5, (R4)
        BNE     tas1
tas0:
        SYNC
        ISYNC
        RETURN

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