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    /* PA2KA(identity) mapping for all frames until last_frame */
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    /* PA2KA(identity) mapping for all frames until last_frame */
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    for (cur = 0; cur < last_frame; cur += FRAME_SIZE) {
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    for (cur = 0; cur < last_frame; cur += FRAME_SIZE) {
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        page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, flags);
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        page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, flags);
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    }
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    }
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    // Create mapping for exception table at high offcet
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    #ifdef HIGH_EXCEPTION_VECTORS
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    /* Note: this mapping cann't be done by hw_map because fixed exception
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       vector is stored at fixed virtual address
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     */
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    // reserve frame for exception table
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    void* virtaddr = frame_alloc( ONE_FRAME ,FRAME_KA);
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    page_mapping_insert(AS_KERNEL, EXC_BASE_ADDRESS, KA2PA(virtaddr), flags );
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    #endif
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    // TODO: move to the kernel space
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    // TODO: move to the kernel space
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    page_mapping_insert(AS_KERNEL, 0x00000000, 0x00000000, flags);
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//  page_mapping_insert(AS_KERNEL, 0xffff0000, 0x00000000, flags);
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    // TODO: remove when aux_printf not needed
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    // TODO: remove when aux_printf not needed
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    page_mapping_insert(AS_KERNEL, 0x10000000, 0x10000000, flags);
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    page_mapping_insert(AS_KERNEL, 0x10000000, 0x10000000, flags);
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    exc_register(EXC_DATA_ABORT,     "page_fault data abort",     (iroutine) data_abourt);
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    exc_register(EXC_PREFETCH_ABORT, "page_fault prefetch abort", (iroutine) prefetch_abourt);
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    as_switch(NULL, AS_KERNEL);
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    as_switch(NULL, AS_KERNEL);
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    // TODO: register fault routine
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}
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}
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/**
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/**
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 * Map device into kernel space.
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 * Map device into kernel space.
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 *
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 *