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Line 51... Line 51...
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{
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{
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    __address dba;
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    __address dba;
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    __u32 i;
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    __u32 i;
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    if (config.cpu_active == 1) {
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    if (config.cpu_active == 1) {
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        dba = frame_alloc(FRAME_KA | FRAME_PANIC);
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        dba = KA2PA(frame_alloc(FRAME_KA | FRAME_PANIC));
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        memsetb(dba, PAGE_SIZE, 0);
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        memsetb(dba, PAGE_SIZE, 0);
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        cpu_write_dba(dba);
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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 but 0th page.
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         * Identity mapping for all but 0th page.
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         * PA2KA(identity) mapping for all but 0th page.
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         */
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         */
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        for (i = 1; i < frames; i++)
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        for (i = 1; i < frames; i++) {
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            map_page_to_frame(i * PAGE_SIZE, i * PAGE_SIZE, PAGE_CACHEABLE, 0);
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            map_page_to_frame(i * PAGE_SIZE, i * PAGE_SIZE, PAGE_CACHEABLE, 0);
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            map_page_to_frame(PA2KA(i * PAGE_SIZE), i * PAGE_SIZE, PAGE_CACHEABLE, 0);         
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        }
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        trap_register(14, page_fault);
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        trap_register(14, page_fault);
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        cpu_write_dba(dba);    
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    }
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    }
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    else {
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    else {
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        /*
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        /*
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         * Application processors need to create their own view of the
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         * Application processors need to create their own view of the
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{
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{
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    struct page_specifier *pd, *pt;
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    struct page_specifier *pd, *pt;
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    __address dba, newpt;
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    __address dba, newpt;
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    int pde, pte;
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    int pde, pte;
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//  TODO: map_page_to_frame should take dba as a parameter
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    dba = cpu_read_dba();
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//  dba = cpu_read_dba();
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    dba = bootstrap_dba;
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    pde = page >> 22;       /* page directory entry */
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    pde = page >> 22;       /* page directory entry */
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    pte = (page >> 12) & 0x3ff; /* page table entry */
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    pte = (page >> 12) & 0x3ff; /* page table entry */
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    pd = (struct page_specifier *) dba;
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    pd = (struct page_specifier *) dba;
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    if (!pd[pde].present) {
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    if (!pd[pde].present) {
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        /*
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        /*
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         * There is currently no page table for this address. Allocate
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         * There is currently no page table for this address. Allocate
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         * frame for the page table and clean it.
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         * frame for the page table and clean it.
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         */
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         */
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        newpt = frame_alloc(FRAME_KA);
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        newpt = KA2PA(frame_alloc(FRAME_KA));
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        pd[pde].frame_address = newpt >> 12;
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        pd[pde].frame_address = newpt >> 12;
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        memsetb(newpt, PAGE_SIZE, 0);
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        memsetb(newpt, PAGE_SIZE, 0);
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        pd[pde].present = 1;
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        pd[pde].present = 1;
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        pd[pde].uaccessible = 1;
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        pd[pde].uaccessible = 1;
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    }
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    }
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    if (copy) {
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    if (copy) {
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        newpt = frame_alloc(FRAME_KA);
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        newpt = KA2PA(frame_alloc(FRAME_KA));
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        memcopy(pd[pde].frame_address << 12, newpt, PAGE_SIZE);
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        memcopy(pd[pde].frame_address << 12, newpt, PAGE_SIZE);
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        pd[pde].frame_address = newpt >> 12;
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        pd[pde].frame_address = newpt >> 12;
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    }
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    }
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    pt = (struct page_specifier *) (pd[pde].frame_address << 12);
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    pt = (struct page_specifier *) (pd[pde].frame_address << 12);