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 *  Will belong to domain 0. No cache or buffering is enabled.
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 *  Will belong to domain 0. No cache or buffering is enabled.
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 *  
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 *
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 *  @param pte    Section entry to initialize.
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 *  @param pte Section entry to initialize.
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 *  @param frame  First frame in the section (frame number).
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 *  @param frame First frame in the section (frame number).
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 *
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 *
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 *  @note         If frame is not 1MB aligned, first lower 1MB aligned frame will be used.
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 *  @note If frame is not 1MB aligned, first lower 1MB aligned frame will be
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 *      used.
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 */  
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 */
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static void init_pte_level0_section(pte_level0_section_t* pte, unsigned int frame)
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static void init_pte_level0_section(pte_level0_section_t* pte,
- 
 
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    unsigned int frame)
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{
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{
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    pte->descriptor_type   = PTE_DESCRIPTOR_SECTION;
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    pte->descriptor_type = PTE_DESCRIPTOR_SECTION;
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    pte->bufferable        = 0;
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    pte->bufferable = 0;
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    pte->cacheable         = 0;
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    pte->cacheable = 0;
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    pte->impl_specific     = 0;
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    pte->impl_specific = 0;
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    pte->access_permission = PTE_AP_USER_NO_KERNEL_RW; 
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    pte->access_permission = PTE_AP_USER_NO_KERNEL_RW;
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    pte->should_be_zero_2  = 0;
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    pte->should_be_zero_2  = 0;
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    pte->section_base_addr = frame;
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    pte->section_base_addr = frame;
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}
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}
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 - 
 
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/** Initializes page table used while booting the kernel. */
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/** Initializes page table used while booting the kernel. */
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static void init_page_table(void)
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static void init_page_table(void)
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{
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{
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    int i;
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    int i;
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    const unsigned int first_kernel_page = ADDR2PFN(PA2KA(0));
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    const unsigned int first_kernel_page = ADDR2PFN(PA2KA(0));
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    // create 1:1 virtual-physical mapping (in lower 2GB)
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    /* Create 1:1 virtual-physical mapping (in lower 2GB). */
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    for (i = 0; i < first_kernel_page; i++) {
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    for (i = 0; i < first_kernel_page; i++) {
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        init_pte_level0_section(&page_table[i], i);
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        init_pte_level0_section(&page_table[i], i);
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    }
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    }
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- 
 
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    /*
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    // create 1:1 virtual-physical mapping in kernel space (upper 2GB),
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     * Create 1:1 virtual-physical mapping in kernel space (upper 2GB),
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    // physical addresses start from 0
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     * physical addresses start from 0.
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     */
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    for (i = first_kernel_page; i < PTL0_ENTRIES; i++) {
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    for (i = first_kernel_page; i < PTL0_ENTRIES; i++) {
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        init_pte_level0_section(&page_table[i], i - first_kernel_page);
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        init_pte_level0_section(&page_table[i], i - first_kernel_page);
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    }
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    }
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}
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}
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 - 
 
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/** Starts the MMU - initializes page table and enables paging. */
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/** Starts the MMU - initializes page table and enables paging. */
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void mmu_start() {
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void mmu_start() {
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    init_page_table();
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    init_page_table();
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    set_ptl0_address(page_table);
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    set_ptl0_address(page_table);
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    enable_paging();
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    enable_paging();
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}
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}
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/** @}
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/** @}
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 */
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 */
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