static void __init map_node()

in mm/motorola.c [290:384]

• 89 lines of code
• 15 McCabe index (conditional complexity)

static void __init map_node(int node)
{
	unsigned long physaddr, virtaddr, size;
	pgd_t *pgd_dir;
	p4d_t *p4d_dir;
	pud_t *pud_dir;
	pmd_t *pmd_dir;
	pte_t *pte_dir;

	size = m68k_memory[node].size;
	physaddr = m68k_memory[node].addr;
	virtaddr = (unsigned long)phys_to_virt(physaddr);
	physaddr |= m68k_supervisor_cachemode |
		    _PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_DIRTY;
	if (CPU_IS_040_OR_060)
		physaddr |= _PAGE_GLOBAL040;

	while (size > 0) {
#ifdef DEBUG
		if (!(virtaddr & (PMD_SIZE-1)))
			printk ("\npa=%#lx va=%#lx ", physaddr & PAGE_MASK,
				virtaddr);
#endif
		pgd_dir = pgd_offset_k(virtaddr);
		if (virtaddr && CPU_IS_020_OR_030) {
			if (!(virtaddr & (PGDIR_SIZE-1)) &&
			    size >= PGDIR_SIZE) {
#ifdef DEBUG
				printk ("[very early term]");
#endif
				pgd_val(*pgd_dir) = physaddr;
				size -= PGDIR_SIZE;
				virtaddr += PGDIR_SIZE;
				physaddr += PGDIR_SIZE;
				continue;
			}
		}
		p4d_dir = p4d_offset(pgd_dir, virtaddr);
		pud_dir = pud_offset(p4d_dir, virtaddr);
		if (!pud_present(*pud_dir)) {
			pmd_dir = kernel_ptr_table();
#ifdef DEBUG
			printk ("[new pointer %p]", pmd_dir);
#endif
			pud_set(pud_dir, pmd_dir);
		} else
			pmd_dir = pmd_offset(pud_dir, virtaddr);

		if (CPU_IS_020_OR_030) {
			if (virtaddr) {
#ifdef DEBUG
				printk ("[early term]");
#endif
				pmd_val(*pmd_dir) = physaddr;
				physaddr += PMD_SIZE;
			} else {
				int i;
#ifdef DEBUG
				printk ("[zero map]");
#endif
				pte_dir = kernel_page_table();
				pmd_set(pmd_dir, pte_dir);

				pte_val(*pte_dir++) = 0;
				physaddr += PAGE_SIZE;
				for (i = 1; i < PTRS_PER_PTE; physaddr += PAGE_SIZE, i++)
					pte_val(*pte_dir++) = physaddr;
			}
			size -= PMD_SIZE;
			virtaddr += PMD_SIZE;
		} else {
			if (!pmd_present(*pmd_dir)) {
#ifdef DEBUG
				printk ("[new table]");
#endif
				pte_dir = kernel_page_table();
				pmd_set(pmd_dir, pte_dir);
			}
			pte_dir = pte_offset_kernel(pmd_dir, virtaddr);

			if (virtaddr) {
				if (!pte_present(*pte_dir))
					pte_val(*pte_dir) = physaddr;
			} else
				pte_val(*pte_dir) = 0;
			size -= PAGE_SIZE;
			virtaddr += PAGE_SIZE;
			physaddr += PAGE_SIZE;
		}

	}
#ifdef DEBUG
	printk("\n");
#endif
}