void __init paging_init()

in mm/motorola.c [390:485]

• 67 lines of code
• 10 McCabe index (conditional complexity)

void __init paging_init(void)
{
	unsigned long max_zone_pfn[MAX_NR_ZONES] = { 0, };
	unsigned long min_addr, max_addr;
	unsigned long addr;
	int i;

#ifdef DEBUG
	printk ("start of paging_init (%p, %lx)\n", kernel_pg_dir, availmem);
#endif

	/* Fix the cache mode in the page descriptors for the 680[46]0.  */
	if (CPU_IS_040_OR_060) {
		int i;
#ifndef mm_cachebits
		mm_cachebits = _PAGE_CACHE040;
#endif
		for (i = 0; i < 16; i++)
			pgprot_val(protection_map[i]) |= _PAGE_CACHE040;
	}

	min_addr = m68k_memory[0].addr;
	max_addr = min_addr + m68k_memory[0].size;
	memblock_add_node(m68k_memory[0].addr, m68k_memory[0].size, 0,
			  MEMBLOCK_NONE);
	for (i = 1; i < m68k_num_memory;) {
		if (m68k_memory[i].addr < min_addr) {
			printk("Ignoring memory chunk at 0x%lx:0x%lx before the first chunk\n",
				m68k_memory[i].addr, m68k_memory[i].size);
			printk("Fix your bootloader or use a memfile to make use of this area!\n");
			m68k_num_memory--;
			memmove(m68k_memory + i, m68k_memory + i + 1,
				(m68k_num_memory - i) * sizeof(struct m68k_mem_info));
			continue;
		}
		memblock_add_node(m68k_memory[i].addr, m68k_memory[i].size, i,
				  MEMBLOCK_NONE);
		addr = m68k_memory[i].addr + m68k_memory[i].size;
		if (addr > max_addr)
			max_addr = addr;
		i++;
	}
	m68k_memoffset = min_addr - PAGE_OFFSET;
	m68k_virt_to_node_shift = fls(max_addr - min_addr - 1) - 6;

	module_fixup(NULL, __start_fixup, __stop_fixup);
	flush_icache();

	high_memory = phys_to_virt(max_addr);

	min_low_pfn = availmem >> PAGE_SHIFT;
	max_pfn = max_low_pfn = max_addr >> PAGE_SHIFT;

	/* Reserve kernel text/data/bss and the memory allocated in head.S */
	memblock_reserve(m68k_memory[0].addr, availmem - m68k_memory[0].addr);

	/*
	 * Map the physical memory available into the kernel virtual
	 * address space. Make sure memblock will not try to allocate
	 * pages beyond the memory we already mapped in head.S
	 */
	memblock_set_bottom_up(true);

	for (i = 0; i < m68k_num_memory; i++) {
		m68k_setup_node(i);
		map_node(i);
	}

	flush_tlb_all();

	early_memtest(min_addr, max_addr);

	/*
	 * initialize the bad page table and bad page to point
	 * to a couple of allocated pages
	 */
	empty_zero_page = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
	if (!empty_zero_page)
		panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
		      __func__, PAGE_SIZE, PAGE_SIZE);

	/*
	 * Set up SFC/DFC registers
	 */
	set_fc(USER_DATA);

#ifdef DEBUG
	printk ("before free_area_init\n");
#endif
	for (i = 0; i < m68k_num_memory; i++)
		if (node_present_pages(i))
			node_set_state(i, N_NORMAL_MEMORY);

	max_zone_pfn[ZONE_DMA] = memblock_end_of_DRAM();
	free_area_init(max_zone_pfn);
}