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        memsetb(dba, PAGE_SIZE, 0);
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        memsetb(dba, PAGE_SIZE, 0);
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        bootstrap_dba = dba;
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        bootstrap_dba = dba;
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        /*
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        /*
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         * Identity mapping for all frames.
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         * PA2KA(identity) mapping for all frames.
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         * PA2KA(identity) mapping for all frames.
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         */
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         */
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        for (i = 0; i < frames; i++)
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        for (i = 0; i < frames; i++)
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            map_page_to_frame(PA2KA(i * PAGE_SIZE), i * PAGE_SIZE, PAGE_CACHEABLE, KA2PA(dba));
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            map_page_to_frame(PA2KA(i * PAGE_SIZE), i * PAGE_SIZE, PAGE_CACHEABLE, KA2PA(dba));
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