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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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 */
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#include <mm/page.h>
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#include <mm/page.h>
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#include <mm/frame.h>
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#include <arch/mm/page.h>
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#include <arch/mm/page.h>
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#include <arch/interrupt.h>
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#include <arch/asm.h>
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#include <config.h>
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#include <memstr.h>
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__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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    count_t i;
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    if (config.cpu_active == 1) {
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        dba = frame_alloc(FRAME_KA | FRAME_PANIC);
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        memsetb(dba, PAGE_SIZE, 0);
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        bootstrap_dba = dba;
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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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         */
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        for (i = 0; i < frames; i++) {
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            map_page_to_frame(i * PAGE_SIZE, i * PAGE_SIZE, PAGE_CACHEABLE | PAGE_EXEC, KA2PA(dba));
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            map_page_to_frame(PA2KA(i * PAGE_SIZE), i * PAGE_SIZE, PAGE_CACHEABLE | PAGE_EXEC, KA2PA(dba));
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        }
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        trap_register(14, page_fault);
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        write_cr3(KA2PA(dba));
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    }
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    else {
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        /*
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         * Application processors need to create their own view of the
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         * virtual address space. Because of that, each AP copies
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         * already-initialized paging information from the bootstrap
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         * processor and adjusts it to fulfill its needs.
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         */
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        dba = frame_alloc(FRAME_KA | FRAME_PANIC);
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        memcpy((void *)dba, (void *)bootstrap_dba , PAGE_SIZE);
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        write_cr3(KA2PA(dba));
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    }
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}
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}