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    ASSERT(CPU != NULL);
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    ASSERT(CPU != NULL);
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    /*
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    /*
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     * NOTE ON OPERATION ORDERING
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     * NOTE ON OPERATION ORDERING
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     *
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     *
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     * On entry, cpu_priority_high() must be called before
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     * On entry, interrupts_disable() must be called before
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     * exception bit is cleared.
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     * exception bit is cleared.
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     */
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     */
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    cpu_priority_high();
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    interrupts_disable();
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    cp0_status_write(cp0_status_read() & ~ (cp0_status_exl_exception_bit |
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    cp0_status_write(cp0_status_read() & ~ (cp0_status_exl_exception_bit |
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                        cp0_status_um_bit));
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                        cp0_status_um_bit));
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    /* Save pstate so that the threads can access it */
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    /* Save pstate so that the threads can access it */
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    /* If THREAD->pstate is set, this is nested exception,
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    /* If THREAD->pstate is set, this is nested exception,