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Rev 2352 Rev 2361
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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 offset
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    // create mapping for exception table at high offset
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    #ifdef HIGH_EXCEPTION_VECTORS
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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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        /* Note: this mapping cann't be done by hw_map because fixed
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        // vector is stored at fixed virtual address
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            exception vector is stored at fixed virtual address
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        // reserve frame for exception table
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            reserve frame for exception table
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        */
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        void* virtaddr = frame_alloc(ONE_FRAME, FRAME_KA);
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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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        page_mapping_insert(AS_KERNEL, EXC_BASE_ADDRESS, KA2PA(virtaddr), flags);
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    #else
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        #error "Only high eception vector supported now"
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    #endif
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    #endif
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    // TODO: #else
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    as_switch(NULL, AS_KERNEL);
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    as_switch(NULL, AS_KERNEL);
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    boot_page_table_free();
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    boot_page_table_free();
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}
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}