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        }
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        }
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        /* Upper kernel mapping
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        /* Upper kernel mapping
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         * - from zero to top of kernel (include bottom addresses
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         * - from zero to top of kernel (include bottom addresses
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         *   because some are needed for init )
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         *   because some are needed for init )
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         */
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         */
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        for (cur = PA2KA_CODE(0); cur < config.base+config.kernel_size; cur += FRAME_SIZE) {
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        for (cur = PA2KA_CODE(0); cur < config.base + config.kernel_size; cur += FRAME_SIZE)
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            page_mapping_insert(AS_KERNEL, cur, KA2PA(cur), identity_flags);
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            page_mapping_insert(AS_KERNEL, cur, KA2PA(cur), identity_flags);
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        for (cur = config.stack_base; cur < config.stack_base + config.stack_size; cur += FRAME_SIZE)
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            page_mapping_insert(AS_KERNEL, cur, KA2PA(cur), identity_flags);
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        }
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        for (i=0; i < init.cnt; i++) {
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        for (i = 0; i < init.cnt; i++) {
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            for (cur=init.tasks[i].addr;cur < init.tasks[i].size; cur += FRAME_SIZE) {
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            for (cur = init.tasks[i].addr; cur < init.tasks[i].addr + init.tasks[i].size; cur += FRAME_SIZE)
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                page_mapping_insert(AS_KERNEL, PA2KA_CODE(KA2PA(cur)), KA2PA(cur), identity_flags);
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                page_mapping_insert(AS_KERNEL, PA2KA_CODE(KA2PA(cur)), KA2PA(cur), identity_flags);
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            }
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        }
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        }
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        exc_register(14, "page_fault", (iroutine)page_fault);
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        exc_register(14, "page_fault", (iroutine)page_fault);
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        write_cr3((uintptr_t) AS_KERNEL->page_table);
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        write_cr3((uintptr_t) AS_KERNEL->page_table);
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    }
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    }