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#include <debug.h>
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#include <debug.h>
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#include <memstr.h>
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#include <memstr.h>
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#include <print.h>
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#include <print.h>
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#include <interrupt.h>
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#include <interrupt.h>
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static __address bootstrap_dba;
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void page_arch_init(void)
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void page_arch_init(void)
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{
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{
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    __address dba;
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    __address cur;
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    __address cur;
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    if (config.cpu_active == 1) {
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    if (config.cpu_active == 1) {
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        page_operations = &page_pt_operations;
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        page_operations = &page_pt_operations;
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        dba = frame_alloc(FRAME_KA | FRAME_PANIC, ONE_FRAME, NULL);
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        memsetb(dba, PAGE_SIZE, 0);
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        bootstrap_dba = dba;
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        /*
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        /*
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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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         */
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         */
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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, PAGE_CACHEABLE, KA2PA(dba));
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            page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, PAGE_CACHEABLE);
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        exc_register(14, "page_fault", page_fault);
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        exc_register(14, "page_fault", page_fault);
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        write_cr3(KA2PA(dba));
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        write_cr3((__address) AS_KERNEL->page_table);
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    }
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    }
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    else {
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    else {
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        write_cr3(KA2PA(bootstrap_dba));
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        write_cr3((__address) AS_KERNEL->page_table);
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    }
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    }
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    paging_on();
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    paging_on();
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}
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}