Exemple #1
0
unsigned long __init setup_memory(void)
{
	unsigned long bootmap_size;
	unsigned long min_pfn;
	int nid;
	mem_prof_t *mp;

	max_low_pfn = 0;
	min_low_pfn = -1;

	mem_prof_init();

	for_each_online_node(nid) {
		mp = &mem_prof[nid];
		NODE_DATA(nid)=(pg_data_t *)&m32r_node_data[nid];
		NODE_DATA(nid)->bdata = &bootmem_node_data[nid];
		min_pfn = mp->start_pfn;
		max_pfn = mp->start_pfn + mp->pages;
		bootmap_size = init_bootmem_node(NODE_DATA(nid), mp->free_pfn,
			mp->start_pfn, max_pfn);

		free_bootmem_node(NODE_DATA(nid), PFN_PHYS(mp->start_pfn),
			PFN_PHYS(mp->pages));

		reserve_bootmem_node(NODE_DATA(nid), PFN_PHYS(mp->start_pfn),
			PFN_PHYS(mp->free_pfn - mp->start_pfn) + bootmap_size,
			BOOTMEM_DEFAULT);

		if (max_low_pfn < max_pfn)
			max_low_pfn = max_pfn;

		if (min_low_pfn > min_pfn)
			min_low_pfn = min_pfn;
	}

#ifdef CONFIG_BLK_DEV_INITRD
	if (LOADER_TYPE && INITRD_START) {
		if (INITRD_START + INITRD_SIZE <= PFN_PHYS(max_low_pfn)) {
			reserve_bootmem_node(NODE_DATA(0), INITRD_START,
				INITRD_SIZE, BOOTMEM_DEFAULT);
			initrd_start = INITRD_START + PAGE_OFFSET;
			initrd_end = initrd_start + INITRD_SIZE;
			printk("initrd:start[%08lx],size[%08lx]\n",
				initrd_start, INITRD_SIZE);
		} else {
			printk("initrd extends beyond end of memory "
				"(0x%08lx > 0x%08llx)\ndisabling initrd\n",
				INITRD_START + INITRD_SIZE,
			        (unsigned long long)PFN_PHYS(max_low_pfn));

			initrd_start = 0;
		}
	}
#endif	/* CONFIG_BLK_DEV_INITRD */

	return max_low_pfn;
}
Exemple #2
0
// start_pfn : 뱅크 0 시작 주소의 물리 small page 번호		(0x20000)
// end_pfn   : 뱅크 0의 마지막 주소의 물리 small page 번호	(0x4f800)
static void __init arm_bootmem_init(unsigned long start_pfn,
	unsigned long end_pfn)
{
	struct memblock_region *reg;
	unsigned int boot_pages;
	phys_addr_t bitmap;
	pg_data_t *pgdat;
	// pg_data_t : struct pglist_data

	/*
	 * Allocate the bootmem bitmap page.  This must be in a region
	 * of memory which has already been mapped.
	 */
	boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
	// boot_pages : 6
	// start_pfn ~ end_pfn 까지를 bitmap으로 바꿨을 때 총 프레임의 갯수가 반환됨.
	
	// boot_pages << PAGE_SHIFT : 0x6000, L1_CACHE_BYTES : 64, _pfn_to_phys(end_pfn) : 0x4F800000
	bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES,
				__pfn_to_phys(end_pfn));
	// non-reserved 영역에서 비트맵용 영역을 만들어 가져옴
	// 영역의 시작 주소가 반환됨(물리)

	/*
	 * Initialise the bootmem allocator, handing the
	 * memory banks over to bootmem.
	 */
	node_set_online(0);	// 비어 있는 함수임
	pgdat = NODE_DATA(0);
	//*pgdat = contig_page_data
	//
	//	.bdata = &bootmem_node_data[0]
	//			 현재는 0으로 되어 있는 값임
	//
	init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn);
	// bdata_list 에 등록
	// bitmap 값을 0xFF로 초기화

	/* Free the lowmem regions from memblock into bootmem. */
	for_each_memblock(memory, reg) {
	// for (reg = memblock.memory.regions; reg < (memblock.memory.regions + memblock.memory.cnt), reg++)
		unsigned long start = memblock_region_memory_base_pfn(reg);
		unsigned long end = memblock_region_memory_end_pfn(reg);
		// start : 0x20000
		// end   : 0xA0000

		if (end >= end_pfn)
			end = end_pfn;
		if (start >= end)
			break;
		
		// start : 0x20000000, (end - start) << PAGE_SHIFT : 0x2F800000
		free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT);
		// start부터 end에 해당하는 bitmap을 전부 0으로 설정
		// 일단 전부 FREE로 만듬
	}
// ARM10C 20131207
// min: 0x20000, max_low: 0x4f800
static void __init arm_bootmem_init(unsigned long start_pfn,
	unsigned long end_pfn)
{
	struct memblock_region *reg;
	unsigned int boot_pages;
	phys_addr_t bitmap;
	pg_data_t *pgdat;

	/*
	 * Allocate the bootmem bitmap page.  This must be in a region
	 * of memory which has already been mapped.
	 */
	// start_pfn: 0x20000, end_pfn: 0x4f800, end_pfn - start_pfn: 0x2f800
	// boot_pages: 0x6
	boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);

	// boot_pages << PAGE_SHIFT: 0x6000, L1_CACHE_BYTES: 64
	// __pfn_to_phys(0x4f800); 0x4f800000
	bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES,
				__pfn_to_phys(end_pfn));

	/*
	 * Initialise the bootmem allocator, handing the
	 * memory banks over to bootmem.
	 */
	node_set_online(0);

	// pglist_data.bdata 의 bootmem_node_data 주소로 설정
	pgdat = NODE_DATA(0);

	// pgdat: ?, __phys_to_pfn(bitmap): ?, start_pfn: 0x20000, end_pfn: 0x4f800
	init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn);

	/* Free the lowmem regions from memblock into bootmem. */
	for_each_memblock(memory, reg) {
		// start: 0x20000
		unsigned long start = memblock_region_memory_base_pfn(reg);
		// end: 0xA0000
		unsigned long end = memblock_region_memory_end_pfn(reg);

		// end: 0xA0000, end_pfn: 0x4f800
		if (end >= end_pfn)
			// end: 0x4f800
			end = end_pfn;
		// start: 0x20000, end: 0x4f800
		if (start >= end)
			break;

		// __pfn_to_phys(0x20000): 0x20000000, (end - start) << PAGE_SHIFT: 0x2f800000
		free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT);
	}
Exemple #4
0
void __init setup_bootmem_node(int nid, unsigned long start, unsigned long end)
{
	unsigned long bootmap_pages, bootmap_start, bootmap_size;
	unsigned long start_pfn, free_pfn, end_pfn;

	/* Don't allow bogus node assignment */
	BUG_ON(nid > MAX_NUMNODES || nid == 0);

	/*
	 * The free pfn starts at the beginning of the range, and is
	 * advanced as necessary for pgdat and node map allocations.
	 */
	free_pfn = start_pfn = start >> PAGE_SHIFT;
	end_pfn = end >> PAGE_SHIFT;

	__add_active_range(nid, start_pfn, end_pfn);

	/* Node-local pgdat */
	NODE_DATA(nid) = pfn_to_kaddr(free_pfn);
	free_pfn += PFN_UP(sizeof(struct pglist_data));
	memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));

	NODE_DATA(nid)->bdata = &bootmem_node_data[nid];
	NODE_DATA(nid)->node_start_pfn = start_pfn;
	NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;

	/* Node-local bootmap */
	bootmap_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
	bootmap_start = (unsigned long)pfn_to_kaddr(free_pfn);
	bootmap_size = init_bootmem_node(NODE_DATA(nid), free_pfn, start_pfn,
				    end_pfn);

	free_bootmem_with_active_regions(nid, end_pfn);

	/* Reserve the pgdat and bootmap space with the bootmem allocator */
	reserve_bootmem_node(NODE_DATA(nid), start_pfn << PAGE_SHIFT,
			     sizeof(struct pglist_data), BOOTMEM_DEFAULT);
	reserve_bootmem_node(NODE_DATA(nid), free_pfn << PAGE_SHIFT,
			     bootmap_pages << PAGE_SHIFT, BOOTMEM_DEFAULT);

	/* It's up */
	node_set_online(nid);

	/* Kick sparsemem */
	sparse_memory_present_with_active_regions(nid);
}
Exemple #5
0
static void __init bootmem_init(void)
{
	unsigned long start_pfn, bootmap_size;
	unsigned long size = initrd_end - initrd_start;

	start_pfn = PFN_UP(__pa(&_end));

	min_low_pfn = PFN_UP(MEMORY_START);
	max_low_pfn = PFN_UP(MEMORY_START + MEMORY_SIZE);

	/* Initialize the boot-time allocator with low memory only. */
	bootmap_size = init_bootmem_node(NODE_DATA(0), start_pfn,
					 min_low_pfn, max_low_pfn);
	add_active_range(0, min_low_pfn, max_low_pfn);

	free_bootmem(PFN_PHYS(start_pfn),
		     (max_low_pfn - start_pfn) << PAGE_SHIFT);
	memory_present(0, start_pfn, max_low_pfn);

	/* Reserve space for the bootmem bitmap. */
	reserve_bootmem(PFN_PHYS(start_pfn), bootmap_size, BOOTMEM_DEFAULT);

	if (size == 0) {
		printk(KERN_INFO "Initrd not found or empty");
		goto disable;
	}

	if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
		printk(KERN_ERR "Initrd extends beyond end of memory");
		goto disable;
	}

	/* Reserve space for the initrd bitmap. */
	reserve_bootmem(__pa(initrd_start), size, BOOTMEM_DEFAULT);
	initrd_below_start_ok = 1;

	pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
		 initrd_start, size);
	return;
disable:
	printk(KERN_CONT " - disabling initrd\n");
	initrd_start = 0;
	initrd_end = 0;
}
Exemple #6
0
static void __init arm_bootmem_init(struct meminfo *mi,
	unsigned long start_pfn, unsigned long end_pfn)
{
	unsigned int boot_pages;
	phys_addr_t bitmap;
	pg_data_t *pgdat;
	int i;

	/*
	 * Allocate the bootmem bitmap page.  This must be in a region
	 * of memory which has already been mapped.
	 */
	boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
	bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES,
				__pfn_to_phys(end_pfn));

	/*
	 * Initialise the bootmem allocator, handing the
	 * memory banks over to bootmem.
	 */
	node_set_online(0);
	pgdat = NODE_DATA(0);
	init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn);

	for_each_bank(i, mi) {
		struct membank *bank = &mi->bank[i];
		if (!bank->highmem)
			free_bootmem(bank_phys_start(bank), bank_phys_size(bank));
	}

	/*
	 * Reserve the memblock reserved regions in bootmem.
	 */
	for (i = 0; i < memblock.reserved.cnt; i++) {
		phys_addr_t start = memblock_start_pfn(&memblock.reserved, i);
		if (start >= start_pfn &&
		    memblock_end_pfn(&memblock.reserved, i) <= end_pfn)
			reserve_bootmem_node(pgdat, __pfn_to_phys(start),
				memblock_size_bytes(&memblock.reserved, i),
				BOOTMEM_DEFAULT);
	}
}
static void __init arm_bootmem_init(unsigned long start_pfn,
	unsigned long end_pfn)
{
	struct memblock_region *reg;
	unsigned int boot_pages;
	phys_addr_t bitmap;
	pg_data_t *pgdat;

	/*
	 * Allocate the bootmem bitmap page.  This must be in a region
	 * of memory which has already been mapped.
	 */
	boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
	bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES,
				__pfn_to_phys(end_pfn));

	/*
	 * Initialise the bootmem allocator, handing the
	 * memory banks over to bootmem.
	 */
	node_set_online(0);
	pgdat = NODE_DATA(0);
	init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn);

	/* Free the lowmem regions from memblock into bootmem. */
	for_each_memblock(memory, reg) {
		unsigned long start = memblock_region_memory_base_pfn(reg);
		unsigned long end = memblock_region_memory_end_pfn(reg);

		if (end >= end_pfn)
			end = end_pfn;
		if (start >= end)
			break;

		free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT);
	}
Exemple #8
0
static void __init bootmem_init(void)
{
	unsigned long reserved_end;
	unsigned long mapstart = ~0UL;
	unsigned long bootmap_size;
	int i;

	/*
	 * Init any data related to initrd. It's a nop if INITRD is
	 * not selected. Once that done we can determine the low bound
	 * of usable memory.
	 */
	reserved_end = max(init_initrd(),
			   (unsigned long) PFN_UP(__pa_symbol(&_end)));

	/*
	 * max_low_pfn is not a number of pages. The number of pages
	 * of the system is given by 'max_low_pfn - min_low_pfn'.
	 */
	min_low_pfn = ~0UL;
	max_low_pfn = 0;

	/*
	 * Find the highest page frame number we have available.
	 */
	for (i = 0; i < boot_mem_map.nr_map; i++) {
		unsigned long start, end;

		if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
			continue;

		start = PFN_UP(boot_mem_map.map[i].addr);
		end = PFN_DOWN(boot_mem_map.map[i].addr
				+ boot_mem_map.map[i].size);

		if (end > max_low_pfn)
			max_low_pfn = end;
		if (start < min_low_pfn)
			min_low_pfn = start;
		if (end <= reserved_end)
			continue;
		if (start >= mapstart)
			continue;
		mapstart = max(reserved_end, start);
	}

	if (min_low_pfn >= max_low_pfn)
		panic("Incorrect memory mapping !!!");
	if (min_low_pfn > ARCH_PFN_OFFSET) {
		pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
			(min_low_pfn - ARCH_PFN_OFFSET) * sizeof(struct page),
			min_low_pfn - ARCH_PFN_OFFSET);
	} else if (min_low_pfn < ARCH_PFN_OFFSET) {
		pr_info("%lu free pages won't be used\n",
			ARCH_PFN_OFFSET - min_low_pfn);
	}
	min_low_pfn = ARCH_PFN_OFFSET;

	/*
	 * Determine low and high memory ranges
	 */
	max_pfn = max_low_pfn;
	if (max_low_pfn > PFN_DOWN(HIGHMEM_START)) {
#ifdef CONFIG_HIGHMEM
		highstart_pfn = PFN_DOWN(HIGHMEM_START);
		highend_pfn = max_low_pfn;
#endif
		max_low_pfn = PFN_DOWN(HIGHMEM_START);
	}

	/*
	 * Initialize the boot-time allocator with low memory only.
	 */
	bootmap_size = init_bootmem_node(NODE_DATA(0), mapstart,
					 min_low_pfn, max_low_pfn);


	for (i = 0; i < boot_mem_map.nr_map; i++) {
		unsigned long start, end;

		start = PFN_UP(boot_mem_map.map[i].addr);
		end = PFN_DOWN(boot_mem_map.map[i].addr
				+ boot_mem_map.map[i].size);

		if (start <= min_low_pfn)
			start = min_low_pfn;
		if (start >= end)
			continue;

#ifndef CONFIG_HIGHMEM
		if (end > max_low_pfn)
			end = max_low_pfn;

		/*
		 * ... finally, is the area going away?
		 */
		if (end <= start)
			continue;
#endif

		add_active_range(0, start, end);
	}

	/*
	 * Register fully available low RAM pages with the bootmem allocator.
	 */
	for (i = 0; i < boot_mem_map.nr_map; i++) {
		unsigned long start, end, size;

		/*
		 * Reserve usable memory.
		 */
		if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
			continue;

		start = PFN_UP(boot_mem_map.map[i].addr);
		end   = PFN_DOWN(boot_mem_map.map[i].addr
				    + boot_mem_map.map[i].size);
		/*
		 * We are rounding up the start address of usable memory
		 * and at the end of the usable range downwards.
		 */
		if (start >= max_low_pfn)
			continue;
		if (start < reserved_end)
			start = reserved_end;
		if (end > max_low_pfn)
			end = max_low_pfn;

		/*
		 * ... finally, is the area going away?
		 */
		if (end <= start)
			continue;
		size = end - start;

		/* Register lowmem ranges */
#ifdef CONFIG_BRCMSTB
		/* carve out space for bmem */
		brcm_free_bootmem(PFN_PHYS(start), size << PAGE_SHIFT);
#else
		free_bootmem(PFN_PHYS(start), size << PAGE_SHIFT);
#endif
	}

	/*
	 * Reserve the bootmap memory.
	 */
	reserve_bootmem(PFN_PHYS(mapstart), bootmap_size, BOOTMEM_DEFAULT);

	/*
	 * Reserve initrd memory if needed.
	 */
	finalize_initrd();

	/*
	 * Call memory_present() on all valid ranges, for SPARSEMEM.
	 * This must be done after setting up bootmem, since memory_present()
	 * may allocate bootmem.
	 */
	for (i = 0; i < boot_mem_map.nr_map; i++) {
		unsigned long start, end;

		if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
			continue;

		start = PFN_UP(boot_mem_map.map[i].addr);
		end   = PFN_DOWN(boot_mem_map.map[i].addr
				    + boot_mem_map.map[i].size);
		memory_present(0, start, end);
	}
}
Exemple #9
0
void __init setup_arch(char **cmdline_p)
{
#if defined(CONFIG_SH_GENERIC) || defined(CONFIG_SH_UNKNOWN)
	extern struct sh_machine_vector mv_unknown;
#endif
	struct sh_machine_vector *mv = NULL;
	char mv_name[MV_NAME_SIZE] = "";
	unsigned long mv_io_base = 0;
	int mv_mmio_enable = 0;
	unsigned long bootmap_size;
	unsigned long start_pfn, max_pfn, max_low_pfn;

#ifdef CONFIG_SH_EARLY_PRINTK
	sh_console_init();
#endif
	
	ROOT_DEV = to_kdev_t(ORIG_ROOT_DEV);

#ifdef CONFIG_BLK_DEV_RAM
	rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
	rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
	rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
#endif

	if (!MOUNT_ROOT_RDONLY)
		root_mountflags &= ~MS_RDONLY;
	init_mm.start_code = (unsigned long)&_text;
	init_mm.end_code = (unsigned long) &_etext;
	init_mm.end_data = (unsigned long) &_edata;
	init_mm.brk = (unsigned long) &_end;

	code_resource.start = virt_to_bus(&_text);
	code_resource.end = virt_to_bus(&_etext)-1;
	data_resource.start = virt_to_bus(&_etext);
	data_resource.end = virt_to_bus(&_edata)-1;

	parse_cmdline(cmdline_p, mv_name, &mv, &mv_io_base, &mv_mmio_enable);

#ifdef CONFIG_CMDLINE_BOOL
	sprintf(*cmdline_p, CONFIG_CMDLINE);
#endif

#ifdef CONFIG_SH_GENERIC
	if (mv == NULL) {
		mv = &mv_unknown;
		if (*mv_name != '\0') {
			printk("Warning: Unsupported machine %s, using unknown\n",
			       mv_name);
		}
	}
	sh_mv = *mv;
#endif
#ifdef CONFIG_SH_UNKNOWN
	sh_mv = mv_unknown;
#endif

#if defined(CONFIG_SH_GENERIC) || defined(CONFIG_SH_UNKNOWN)
	if (mv_io_base != 0) {
		sh_mv.mv_inb = generic_inb;
		sh_mv.mv_inw = generic_inw;
		sh_mv.mv_inl = generic_inl;
		sh_mv.mv_outb = generic_outb;
		sh_mv.mv_outw = generic_outw;
		sh_mv.mv_outl = generic_outl;

		sh_mv.mv_inb_p = generic_inb_p;
		sh_mv.mv_inw_p = generic_inw_p;
		sh_mv.mv_inl_p = generic_inl_p;
		sh_mv.mv_outb_p = generic_outb_p;
		sh_mv.mv_outw_p = generic_outw_p;
		sh_mv.mv_outl_p = generic_outl_p;

		sh_mv.mv_insb = generic_insb;
		sh_mv.mv_insw = generic_insw;
		sh_mv.mv_insl = generic_insl;
		sh_mv.mv_outsb = generic_outsb;
		sh_mv.mv_outsw = generic_outsw;
		sh_mv.mv_outsl = generic_outsl;

		sh_mv.mv_isa_port2addr = generic_isa_port2addr;
		generic_io_base = mv_io_base;
	}
	if (mv_mmio_enable != 0) {
		sh_mv.mv_readb = generic_readb;
		sh_mv.mv_readw = generic_readw;
		sh_mv.mv_readl = generic_readl;
		sh_mv.mv_writeb = generic_writeb;
		sh_mv.mv_writew = generic_writew;
		sh_mv.mv_writel = generic_writel;
	}
#endif

#define PFN_UP(x)	(((x) + PAGE_SIZE-1) >> PAGE_SHIFT)
#define PFN_DOWN(x)	((x) >> PAGE_SHIFT)
#define PFN_PHYS(x)	((x) << PAGE_SHIFT)

#ifdef CONFIG_DISCONTIGMEM
	NODE_DATA(0)->bdata = &discontig_node_bdata[0];
	NODE_DATA(1)->bdata = &discontig_node_bdata[1];

	bootmap_size = init_bootmem_node(NODE_DATA(1), 
					 PFN_UP(__MEMORY_START_2ND),
					 PFN_UP(__MEMORY_START_2ND),
					 PFN_DOWN(__MEMORY_START_2ND+__MEMORY_SIZE_2ND));
	free_bootmem_node(NODE_DATA(1), __MEMORY_START_2ND, __MEMORY_SIZE_2ND);
	reserve_bootmem_node(NODE_DATA(1), __MEMORY_START_2ND, bootmap_size);
#endif

	/*
	 * Find the highest page frame number we have available
	 */
	max_pfn = PFN_DOWN(__pa(memory_end));

	/*
	 * Determine low and high memory ranges:
	 */
	max_low_pfn = max_pfn;

 	/*
	 * Partially used pages are not usable - thus
	 * we are rounding upwards:
 	 */
	start_pfn = PFN_UP(__pa(&_end));
	/*
	 * Find a proper area for the bootmem bitmap. After this
	 * bootstrap step all allocations (until the page allocator
	 * is intact) must be done via bootmem_alloc().
	 */
	bootmap_size = init_bootmem_node(NODE_DATA(0), start_pfn,
					 __MEMORY_START>>PAGE_SHIFT,
					 max_low_pfn);

	/*
	 * Register fully available low RAM pages with the bootmem allocator.
	 */
	{
		unsigned long curr_pfn, last_pfn, pages;

		/*
		 * We are rounding up the start address of usable memory:
		 */
		curr_pfn = PFN_UP(__MEMORY_START);
		/*
		 * ... and at the end of the usable range downwards:
		 */
		last_pfn = PFN_DOWN(__pa(memory_end));

		if (last_pfn > max_low_pfn)
			last_pfn = max_low_pfn;

		pages = last_pfn - curr_pfn;
		free_bootmem_node(NODE_DATA(0), PFN_PHYS(curr_pfn),
				  PFN_PHYS(pages));
	}

	/*
	 * Reserve the kernel text and
	 * Reserve the bootmem bitmap. We do this in two steps (first step
	 * was init_bootmem()), because this catches the (definitely buggy)
	 * case of us accidentally initializing the bootmem allocator with
	 * an invalid RAM area.
	 */
	reserve_bootmem_node(NODE_DATA(0), __MEMORY_START+PAGE_SIZE,
		(PFN_PHYS(start_pfn)+bootmap_size+PAGE_SIZE-1)-__MEMORY_START);

	/*
	 * reserve physical page 0 - it's a special BIOS page on many boxes,
	 * enabling clean reboots, SMP operation, laptop functions.
	 */
	reserve_bootmem_node(NODE_DATA(0), __MEMORY_START, PAGE_SIZE);

#ifdef CONFIG_BLK_DEV_INITRD
	if (LOADER_TYPE && INITRD_START) {
		if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
			reserve_bootmem_node(NODE_DATA(0), INITRD_START+__MEMORY_START, INITRD_SIZE);
			initrd_start =
				INITRD_START ? INITRD_START + PAGE_OFFSET + __MEMORY_START : 0;
			initrd_end = initrd_start + INITRD_SIZE;
		} else {
			printk("initrd extends beyond end of memory "
			    "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
				    INITRD_START + INITRD_SIZE,
				    max_low_pfn << PAGE_SHIFT);
			initrd_start = 0;
		}
	}
#endif

#if 0
	/*
	 * Request the standard RAM and ROM resources -
	 * they eat up PCI memory space
	 */
	request_resource(&iomem_resource, ram_resources+0);
	request_resource(&iomem_resource, ram_resources+1);
	request_resource(&iomem_resource, ram_resources+2);
	request_resource(ram_resources+1, &code_resource);
	request_resource(ram_resources+1, &data_resource);
	probe_roms();

	/* request I/O space for devices used on all i[345]86 PCs */
	for (i = 0; i < STANDARD_IO_RESOURCES; i++)
		request_resource(&ioport_resource, standard_io_resources+i);
#endif

#ifdef CONFIG_VT
#if defined(CONFIG_VGA_CONSOLE)
	conswitchp = &vga_con;
#elif defined(CONFIG_DUMMY_CONSOLE)
	conswitchp = &dummy_con;
#endif
#endif

	/* Perform the machine specific initialisation */
	if (sh_mv.mv_init_arch != NULL) {
		sh_mv.mv_init_arch();
	}

#if defined(__SH4__)
	init_task.used_math = 0;
	init_task.flags &= ~PF_USEDFPU;
#endif

#ifdef CONFIG_UBC_WAKEUP
	/*
	 * Some brain-damaged loaders decided it would be a good idea to put
	 * the UBC to sleep. This causes some issues when it comes to things
	 * like PTRACE_SINGLESTEP or doing hardware watchpoints in GDB.  So ..
	 * we wake it up and hope that all is well.
	 */
	ubc_wakeup();
#endif

	paging_init();
}
void __init setup_arch(char **cmdline_p)
{
	int bootmap_size;

	memory_start = PAGE_ALIGN(_ramstart);
	memory_end = _ramend;

	init_mm.start_code = (unsigned long) &_stext;
	init_mm.end_code = (unsigned long) &_etext;
	init_mm.end_data = (unsigned long) &_edata;
	init_mm.brk = (unsigned long) 0;

	config_BSP(&command_line[0], sizeof(command_line));

#if defined(CONFIG_BOOTPARAM)
	strncpy(&command_line[0], CONFIG_BOOTPARAM_STRING, sizeof(command_line));
	command_line[sizeof(command_line) - 1] = 0;
#endif /* CONFIG_BOOTPARAM */

	process_uboot_commandline(&command_line[0], sizeof(command_line));

	pr_info("uClinux with CPU " CPU_NAME "\n");

#ifdef CONFIG_UCDIMM
	pr_info("uCdimm by Lineo, Inc. <www.lineo.com>\n");
#endif
#ifdef CONFIG_M68VZ328
	pr_info("M68VZ328 support by Evan Stawnyczy <*****@*****.**>\n");
#endif
#ifdef CONFIG_COLDFIRE
	pr_info("COLDFIRE port done by Greg Ungerer, [email protected]\n");
#ifdef CONFIG_M5307
	pr_info("Modified for M5307 by Dave Miller, [email protected]\n");
#endif
#ifdef CONFIG_ELITE
	pr_info("Modified for M5206eLITE by Rob Scott, [email protected]\n");
#endif
#endif
	pr_info("Flat model support (C) 1998,1999 Kenneth Albanowski, D. Jeff Dionne\n");

#if defined( CONFIG_PILOT ) && defined( CONFIG_M68328 )
	pr_info("TRG SuperPilot FLASH card support <*****@*****.**>\n");
#endif
#if defined( CONFIG_PILOT ) && defined( CONFIG_M68EZ328 )
	pr_info("PalmV support by Lineo Inc. <*****@*****.**>\n");
#endif
#ifdef CONFIG_DRAGEN2
	pr_info("DragonEngine II board support by Georges Menie\n");
#endif
#ifdef CONFIG_M5235EVB
	pr_info("Motorola M5235EVB support (C)2005 Syn-tech Systems, Inc. (Jate Sujjavanich)\n");
#endif

	pr_debug("KERNEL -> TEXT=0x%p-0x%p DATA=0x%p-0x%p BSS=0x%p-0x%p\n",
		 _stext, _etext, _sdata, _edata, __bss_start, __bss_stop);
	pr_debug("MEMORY -> ROMFS=0x%p-0x%06lx MEM=0x%06lx-0x%06lx\n ",
		 __bss_stop, memory_start, memory_start, memory_end);

	/* Keep a copy of command line */
	*cmdline_p = &command_line[0];
	memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
	boot_command_line[COMMAND_LINE_SIZE-1] = 0;

#if defined(CONFIG_FRAMEBUFFER_CONSOLE) && defined(CONFIG_DUMMY_CONSOLE)
	conswitchp = &dummy_con;
#endif

	/*
	 * Give all the memory to the bootmap allocator, tell it to put the
	 * boot mem_map at the start of memory.
	 */
	min_low_pfn = PFN_DOWN(memory_start);
	max_pfn = max_low_pfn = PFN_DOWN(memory_end);

	bootmap_size = init_bootmem_node(
			NODE_DATA(0),
			min_low_pfn,		/* map goes here */
			PFN_DOWN(PAGE_OFFSET),
			max_pfn);
	/*
	 * Free the usable memory, we have to make sure we do not free
	 * the bootmem bitmap so we then reserve it after freeing it :-)
	 */
	free_bootmem(memory_start, memory_end - memory_start);
	reserve_bootmem(memory_start, bootmap_size, BOOTMEM_DEFAULT);

#if defined(CONFIG_UBOOT) && defined(CONFIG_BLK_DEV_INITRD)
	if ((initrd_start > 0) && (initrd_start < initrd_end) &&
			(initrd_end < memory_end))
		reserve_bootmem(initrd_start, initrd_end - initrd_start,
				 BOOTMEM_DEFAULT);
#endif /* if defined(CONFIG_BLK_DEV_INITRD) */

	/*
	 * Get kmalloc into gear.
	 */
	paging_init();
}
Exemple #11
0
void __init setup_arch(char **cmdline_p)
{
	extern void init_etrax_debug(void);
	unsigned long bootmap_size;
	unsigned long start_pfn, max_pfn;
	unsigned long memory_start;

	/* register an initial console printing routine for printk's */

	init_etrax_debug();

	/* we should really poll for DRAM size! */

	high_memory = &dram_end;

	if(romfs_in_flash || !romfs_length) {
		/* if we have the romfs in flash, or if there is no rom filesystem,
		 * our free area starts directly after the BSS
		 */
		memory_start = (unsigned long) &_end;
	} else {
		/* otherwise the free area starts after the ROM filesystem */
		printk("ROM fs in RAM, size %lu bytes\n", romfs_length);
		memory_start = romfs_start + romfs_length;
	}

	/* process 1's initial memory region is the kernel code/data */

	init_mm.start_code = (unsigned long) &text_start;
	init_mm.end_code =   (unsigned long) &_etext;
	init_mm.end_data =   (unsigned long) &_edata;
	init_mm.brk =        (unsigned long) &_end;

	/* min_low_pfn points to the start of DRAM, start_pfn points
	 * to the first DRAM pages after the kernel, and max_low_pfn
	 * to the end of DRAM.
	 */

        /*
         * partially used pages are not usable - thus
         * we are rounding upwards:
         */

        start_pfn = PFN_UP(memory_start);  /* usually c0000000 + kernel + romfs */
	max_pfn =   PFN_DOWN((unsigned long)high_memory); /* usually c0000000 + dram size */

        /*
         * Initialize the boot-time allocator (start, end)
	 *
	 * We give it access to all our DRAM, but we could as well just have
	 * given it a small slice. No point in doing that though, unless we
	 * have non-contiguous memory and want the boot-stuff to be in, say,
	 * the smallest area.
	 *
	 * It will put a bitmap of the allocated pages in the beginning
	 * of the range we give it, but it won't mark the bitmaps pages
	 * as reserved. We have to do that ourselves below.
	 *
	 * We need to use init_bootmem_node instead of init_bootmem
	 * because our map starts at a quite high address (min_low_pfn).
         */

	max_low_pfn = max_pfn;
	min_low_pfn = PAGE_OFFSET >> PAGE_SHIFT;

	bootmap_size = init_bootmem_node(NODE_DATA(0), start_pfn,
					 min_low_pfn,
					 max_low_pfn);

	/* And free all memory not belonging to the kernel (addr, size) */

	free_bootmem(PFN_PHYS(start_pfn), PFN_PHYS(max_pfn - start_pfn));

        /*
         * Reserve the bootmem bitmap itself as well. We do this in two
         * steps (first step was init_bootmem()) because this catches
         * the (very unlikely) case of us accidentally initializing the
         * bootmem allocator with an invalid RAM area.
	 *
	 * Arguments are start, size
         */

	reserve_bootmem(PFN_PHYS(start_pfn), bootmap_size, BOOTMEM_DEFAULT);

	/* paging_init() sets up the MMU and marks all pages as reserved */

	paging_init();

	*cmdline_p = cris_command_line;

#ifdef CONFIG_ETRAX_CMDLINE
        if (!strcmp(cris_command_line, "")) {
		strlcpy(cris_command_line, CONFIG_ETRAX_CMDLINE, COMMAND_LINE_SIZE);
		cris_command_line[COMMAND_LINE_SIZE - 1] = '\0';
	}
#endif

	/* Save command line for future references. */
	memcpy(boot_command_line, cris_command_line, COMMAND_LINE_SIZE);
	boot_command_line[COMMAND_LINE_SIZE - 1] = '\0';

	/* give credit for the CRIS port */
	show_etrax_copyright();

	/* Setup utsname */
	strcpy(init_utsname()->machine, cris_machine_name);
}
Exemple #12
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void __init setup_memory(void)
{
	int i;
	unsigned long map_size;
	u32 kernel_align_start, kernel_align_size;

	/* Find main memory where is the kernel */
	for (i = 0; i < lmb.memory.cnt; i++) {
		memory_start = (u32) lmb.memory.region[i].base;
		memory_end = (u32) lmb.memory.region[i].base
				+ (u32) lmb.memory.region[i].size;
		if ((memory_start <= (u32)_text) &&
					((u32)_text <= memory_end)) {
			memory_size = memory_end - memory_start;
			PAGE_OFFSET = memory_start;
			printk(KERN_INFO "%s: Main mem: 0x%x-0x%x, "
				"size 0x%08x\n", __func__, memory_start,
						memory_end, memory_size);
			break;
		}
	}

	if (!memory_start || !memory_end) {
		panic("%s: Missing memory setting 0x%08x-0x%08x\n",
			__func__, memory_start, memory_end);
	}

	/* reservation of region where is the kernel */
	kernel_align_start = PAGE_DOWN((u32)_text);
	/* ALIGN can be remove because _end in vmlinux.lds.S is align */
	kernel_align_size = PAGE_UP((u32)klimit) - kernel_align_start;
	lmb_reserve(kernel_align_start, kernel_align_size);
	printk(KERN_INFO "%s: kernel addr=0x%08x-0x%08x size=0x%08x\n",
		__func__, kernel_align_start, kernel_align_start
			+ kernel_align_size, kernel_align_size);

	/*
	 * Kernel:
	 * start: base phys address of kernel - page align
	 * end: base phys address of kernel - page align
	 *
	 * min_low_pfn - the first page (mm/bootmem.c - node_boot_start)
	 * max_low_pfn
	 * max_mapnr - the first unused page (mm/bootmem.c - node_low_pfn)
	 * num_physpages - number of all pages
	 */

	/* memory start is from the kernel end (aligned) to higher addr */
	min_low_pfn = memory_start >> PAGE_SHIFT; /* minimum for allocation */
	/* RAM is assumed contiguous */
	num_physpages = max_mapnr = memory_size >> PAGE_SHIFT;
	max_pfn = max_low_pfn = memory_end >> PAGE_SHIFT;

	printk(KERN_INFO "%s: max_mapnr: %#lx\n", __func__, max_mapnr);
	printk(KERN_INFO "%s: min_low_pfn: %#lx\n", __func__, min_low_pfn);
	printk(KERN_INFO "%s: max_low_pfn: %#lx\n", __func__, max_low_pfn);

	/*
	 * Find an area to use for the bootmem bitmap.
	 * We look for the first area which is at least
	 * 128kB in length (128kB is enough for a bitmap
	 * for 4GB of memory, using 4kB pages), plus 1 page
	 * (in case the address isn't page-aligned).
	 */
	map_size = init_bootmem_node(NODE_DATA(0), PFN_UP(TOPHYS((u32)_end)),
					min_low_pfn, max_low_pfn);

	lmb_reserve(PFN_UP(TOPHYS((u32)_end)) << PAGE_SHIFT, map_size);

	/* free bootmem is whole main memory */
	free_bootmem(memory_start, memory_size);

	/* reserve allocate blocks */
	for (i = 0; i < lmb.reserved.cnt; i++) {
		pr_debug("reserved %d - 0x%08x-0x%08x\n", i,
			(u32) lmb.reserved.region[i].base,
			(u32) lmb_size_bytes(&lmb.reserved, i));
		reserve_bootmem(lmb.reserved.region[i].base,
			lmb_size_bytes(&lmb.reserved, i) - 1, BOOTMEM_DEFAULT);
	}
	paging_init();
}
Exemple #13
0
void __init setup_bootmem_allocator(unsigned long free_pfn)
{
	unsigned long bootmap_size;

	/*
	 * Find a proper area for the bootmem bitmap. After this
	 * bootstrap step all allocations (until the page allocator
	 * is intact) must be done via bootmem_alloc().
	 */
	bootmap_size = init_bootmem_node(NODE_DATA(0), free_pfn,
					 min_low_pfn, max_low_pfn);

	add_active_range(0, min_low_pfn, max_low_pfn);
	register_bootmem_low_pages();

	node_set_online(0);

	/*
	 * Reserve the kernel text and
	 * Reserve the bootmem bitmap. We do this in two steps (first step
	 * was init_bootmem()), because this catches the (definitely buggy)
	 * case of us accidentally initializing the bootmem allocator with
	 * an invalid RAM area.
	 */
	reserve_bootmem(__MEMORY_START+PAGE_SIZE,
		(PFN_PHYS(free_pfn)+bootmap_size+PAGE_SIZE-1)-__MEMORY_START);

	/*
	 * reserve physical page 0 - it's a special BIOS page on many boxes,
	 * enabling clean reboots, SMP operation, laptop functions.
	 */
	reserve_bootmem(__MEMORY_START, PAGE_SIZE);

	sparse_memory_present_with_active_regions(0);

#ifdef CONFIG_BLK_DEV_INITRD
	ROOT_DEV = MKDEV(RAMDISK_MAJOR, 0);
	if (&__rd_start != &__rd_end) {
		LOADER_TYPE = 1;
		INITRD_START = PHYSADDR((unsigned long)&__rd_start) -
					__MEMORY_START;
		INITRD_SIZE = (unsigned long)&__rd_end -
			      (unsigned long)&__rd_start;
	}

	if (LOADER_TYPE && INITRD_START) {
		if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
			reserve_bootmem(INITRD_START + __MEMORY_START,
					INITRD_SIZE);
			initrd_start = INITRD_START + PAGE_OFFSET +
					__MEMORY_START;
			initrd_end = initrd_start + INITRD_SIZE;
		} else {
			printk("initrd extends beyond end of memory "
			    "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
				    INITRD_START + INITRD_SIZE,
				    max_low_pfn << PAGE_SHIFT);
			initrd_start = 0;
		}
	}
#endif
#ifdef CONFIG_KEXEC
	if (crashk_res.start != crashk_res.end)
		reserve_bootmem(crashk_res.start,
			crashk_res.end - crashk_res.start + 1);
#endif
}
Exemple #14
0
static void __init bootmem_init(void)
{
	unsigned long reserved_end;
	unsigned long mapstart = ~0UL;
	unsigned long bootmap_size;
	int i;

	/*
	 * Sanity check any INITRD first. We don't take it into account
	 * for bootmem setup initially, rely on the end-of-kernel-code
	 * as our memory range starting point. Once bootmem is inited we
	 * will reserve the area used for the initrd.
	 */
	init_initrd();
	reserved_end = (unsigned long) PFN_UP(__pa_symbol(&_end));

	/*
	 * max_low_pfn is not a number of pages. The number of pages
	 * of the system is given by 'max_low_pfn - min_low_pfn'.
	 */
	min_low_pfn = ~0UL;
	max_low_pfn = 0;

	/*
	 * Find the highest page frame number we have available.
	 */
	for (i = 0; i < boot_mem_map.nr_map; i++) {
		unsigned long start, end;

		if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
			continue;

		start = PFN_UP(boot_mem_map.map[i].addr);
		end = PFN_DOWN(boot_mem_map.map[i].addr
				+ boot_mem_map.map[i].size);

		if (end > max_low_pfn)
			max_low_pfn = end;
		if (start < min_low_pfn)
			min_low_pfn = start;
		if (end <= reserved_end)
			continue;
		if (start >= mapstart)
			continue;
		mapstart = max(reserved_end, start);
	}

	if (min_low_pfn >= max_low_pfn)
		panic("Incorrect memory mapping !!!");
	if (min_low_pfn > ARCH_PFN_OFFSET) {
		printk(KERN_INFO
		       "Wasting %lu bytes for tracking %lu unused pages\n",
		       (min_low_pfn - ARCH_PFN_OFFSET) * sizeof(struct page),
		       min_low_pfn - ARCH_PFN_OFFSET);
	} else if (min_low_pfn < ARCH_PFN_OFFSET) {
		printk(KERN_INFO
		       "%lu free pages won't be used\n",
		       ARCH_PFN_OFFSET - min_low_pfn);
	}
	min_low_pfn = ARCH_PFN_OFFSET;

	/*
	 * Determine low and high memory ranges
	 */
	max_pfn = max_low_pfn;
	if (max_low_pfn > PFN_DOWN(HIGHMEM_START)) {
#ifdef CONFIG_HIGHMEM
		highstart_pfn = PFN_DOWN(HIGHMEM_START);
		highend_pfn = max_low_pfn;
#endif
		max_low_pfn = PFN_DOWN(HIGHMEM_START);
	}

	/*
	 * Initialize the boot-time allocator with low memory only.
	 */
	bootmap_size = init_bootmem_node(NODE_DATA(0), mapstart,
					 min_low_pfn, max_low_pfn);
	/*
	 * Register fully available low RAM pages with the bootmem allocator.
	 */
	for (i = 0; i < boot_mem_map.nr_map; i++) {
		unsigned long start, end, size;

		start = PFN_UP(boot_mem_map.map[i].addr);
		end   = PFN_DOWN(boot_mem_map.map[i].addr
				    + boot_mem_map.map[i].size);

		/*
		 * Reserve usable memory.
		 */
		switch (boot_mem_map.map[i].type) {
		case BOOT_MEM_RAM:
			break;
		case BOOT_MEM_INIT_RAM:
			memory_present(0, start, end);
			continue;
		default:
			/* Not usable memory */
			continue;
		}

		/*
		 * We are rounding up the start address of usable memory
		 * and at the end of the usable range downwards.
		 */
		if (start >= max_low_pfn)
			continue;
		if (start < reserved_end)
			start = reserved_end;
		if (end > max_low_pfn)
			end = max_low_pfn;

		/*
		 * ... finally, is the area going away?
		 */
		if (end <= start)
			continue;
		size = end - start;

		/* Register lowmem ranges */
		free_bootmem(PFN_PHYS(start), size << PAGE_SHIFT);
		memory_present(0, start, end);
	}

	/*
	 * Reserve the bootmap memory.
	 */
	reserve_bootmem(PFN_PHYS(mapstart), bootmap_size);

	/*
	 * Reserve initrd memory if needed.
	 */
	finalize_initrd();
}
Exemple #15
0
void __init setup_arch(char **cmdline_p)
{
	unsigned long bootmap_size;
	unsigned long start_pfn, max_pfn, max_low_pfn;

#ifdef CONFIG_EARLY_PRINTK
	extern void enable_early_printk(void);

	enable_early_printk();
#endif
#ifdef CONFIG_CMDLINE_BOOL
        strcpy(COMMAND_LINE, CONFIG_CMDLINE);
#endif

	ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);

#ifdef CONFIG_BLK_DEV_RAM
	rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
	rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
	rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
#endif

	if (!MOUNT_ROOT_RDONLY)
		root_mountflags &= ~MS_RDONLY;
	init_mm.start_code = (unsigned long) _text;
	init_mm.end_code = (unsigned long) _etext;
	init_mm.end_data = (unsigned long) _edata;
	init_mm.brk = (unsigned long) _end;

	code_resource.start = virt_to_bus(_text);
	code_resource.end = virt_to_bus(_etext)-1;
	data_resource.start = virt_to_bus(_etext);
	data_resource.end = virt_to_bus(_edata)-1;

	sh_mv_setup(cmdline_p);

#define PFN_UP(x)	(((x) + PAGE_SIZE-1) >> PAGE_SHIFT)
#define PFN_DOWN(x)	((x) >> PAGE_SHIFT)
#define PFN_PHYS(x)	((x) << PAGE_SHIFT)

#ifdef CONFIG_DISCONTIGMEM
	NODE_DATA(0)->bdata = &discontig_node_bdata[0];
	NODE_DATA(1)->bdata = &discontig_node_bdata[1];

	bootmap_size = init_bootmem_node(NODE_DATA(1), 
					 PFN_UP(__MEMORY_START_2ND),
					 PFN_UP(__MEMORY_START_2ND),
					 PFN_DOWN(__MEMORY_START_2ND+__MEMORY_SIZE_2ND));
	free_bootmem_node(NODE_DATA(1), __MEMORY_START_2ND, __MEMORY_SIZE_2ND);
	reserve_bootmem_node(NODE_DATA(1), __MEMORY_START_2ND, bootmap_size);
#endif

	/*
	 * Find the highest page frame number we have available
	 */
	max_pfn = PFN_DOWN(__pa(memory_end));

	/*
	 * Determine low and high memory ranges:
	 */
	max_low_pfn = max_pfn;

 	/*
	 * Partially used pages are not usable - thus
	 * we are rounding upwards:
 	 */
	start_pfn = PFN_UP(__pa(_end));

	/*
	 * Find a proper area for the bootmem bitmap. After this
	 * bootstrap step all allocations (until the page allocator
	 * is intact) must be done via bootmem_alloc().
	 */
	bootmap_size = init_bootmem_node(NODE_DATA(0), start_pfn,
					 __MEMORY_START>>PAGE_SHIFT,
					 max_low_pfn);
	/*
	 * Register fully available low RAM pages with the bootmem allocator.
	 */
	{
		unsigned long curr_pfn, last_pfn, pages;

		/*
		 * We are rounding up the start address of usable memory:
		 */
		curr_pfn = PFN_UP(__MEMORY_START);
		/*
		 * ... and at the end of the usable range downwards:
		 */
		last_pfn = PFN_DOWN(__pa(memory_end));

		if (last_pfn > max_low_pfn)
			last_pfn = max_low_pfn;

		pages = last_pfn - curr_pfn;
		free_bootmem_node(NODE_DATA(0), PFN_PHYS(curr_pfn),
				  PFN_PHYS(pages));
	}

	/*
	 * Reserve the kernel text and
	 * Reserve the bootmem bitmap. We do this in two steps (first step
	 * was init_bootmem()), because this catches the (definitely buggy)
	 * case of us accidentally initializing the bootmem allocator with
	 * an invalid RAM area.
	 */
	reserve_bootmem_node(NODE_DATA(0), __MEMORY_START+PAGE_SIZE,
		(PFN_PHYS(start_pfn)+bootmap_size+PAGE_SIZE-1)-__MEMORY_START);

	/*
	 * reserve physical page 0 - it's a special BIOS page on many boxes,
	 * enabling clean reboots, SMP operation, laptop functions.
	 */
	reserve_bootmem_node(NODE_DATA(0), __MEMORY_START, PAGE_SIZE);

#ifdef CONFIG_BLK_DEV_INITRD
 	ROOT_DEV = MKDEV(RAMDISK_MAJOR, 0);
 	if (&__rd_start != &__rd_end) {
		LOADER_TYPE = 1;
		INITRD_START = PHYSADDR((unsigned long)&__rd_start) - __MEMORY_START;
		INITRD_SIZE = (unsigned long)&__rd_end - (unsigned long)&__rd_start;
 	}

	if (LOADER_TYPE && INITRD_START) {
		if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
			reserve_bootmem_node(NODE_DATA(0), INITRD_START+__MEMORY_START, INITRD_SIZE);
			initrd_start =
				INITRD_START ? INITRD_START + PAGE_OFFSET + __MEMORY_START : 0;
			initrd_end = initrd_start + INITRD_SIZE;
		} else {
			printk("initrd extends beyond end of memory "
			    "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
				    INITRD_START + INITRD_SIZE,
				    max_low_pfn << PAGE_SHIFT);
			initrd_start = 0;
		}
	}
#endif

#ifdef CONFIG_DUMMY_CONSOLE
	conswitchp = &dummy_con;
#endif

	/* Perform the machine specific initialisation */
	platform_setup();

	paging_init();
}
static void __init bootmem_init(void)
{
	unsigned long reserved_end;
	unsigned long mapstart = ~0UL;
	unsigned long bootmap_size;
	int i;

	/*
	 * Init any data related to initrd. It's a nop if INITRD is
	 * not selected. Once that done we can determine the low bound
	 * of usable memory.
	 */
#ifdef CONFIG_XEN
	reserved_end = max(init_initrd(),
			   (unsigned long) PFN_UP(__pa_symbol(&_end) + PAGE_SIZE));
#else
	reserved_end = max(init_initrd(),
			   (unsigned long) PFN_UP(__pa_symbol(&_end)));
#endif

	/*
	 * max_low_pfn is not a number of pages. The number of pages
	 * of the system is given by 'max_low_pfn - min_low_pfn'.
	 */
	min_low_pfn = ~0UL;
	max_low_pfn = 0;

	/*
	 * Find the highest page frame number we have available.
	 */
	for (i = 0; i < boot_mem_map.nr_map; i++) {
		unsigned long start, end;

		if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
			continue;

		/* Changing the math in several places below to add -1.  If a region
		 * ends exactly on a boundary where there is no DRAM, the last PFN
		 * will be incorrect (one page of memory will have no DRAM backing).
		 * By subtracting one here, this problem is eliminated. */
		start = PFN_UP(boot_mem_map.map[i].addr);
		end = PFN_DOWN(boot_mem_map.map[i].addr
				+ boot_mem_map.map[i].size - 1);

		if (end > max_low_pfn)
			max_low_pfn = end;
		if (start < min_low_pfn)
			min_low_pfn = start;
		if (end <= reserved_end)
			continue;
		if (start >= mapstart)
			continue;
		mapstart = max(reserved_end, start);
	}

	if (min_low_pfn >= max_low_pfn)
		panic("Incorrect memory mapping !!!");
	if (min_low_pfn > ARCH_PFN_OFFSET) {
		pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
			(min_low_pfn - ARCH_PFN_OFFSET) * sizeof(struct page),
			min_low_pfn - ARCH_PFN_OFFSET);
	} else if (min_low_pfn < ARCH_PFN_OFFSET) {
		pr_info("%lu free pages won't be used\n",
			ARCH_PFN_OFFSET - min_low_pfn);
	}
	min_low_pfn = ARCH_PFN_OFFSET;

	/*
	 * Determine low and high memory ranges
	 */
	max_pfn = max_low_pfn;
	if (max_low_pfn > PFN_DOWN(HIGHMEM_START)) {
#ifdef CONFIG_HIGHMEM
		highstart_pfn = PFN_DOWN(HIGHMEM_START);
		highend_pfn = max_low_pfn;
#endif
		max_low_pfn = PFN_DOWN(HIGHMEM_START);
	}

	max_low_pfn = recalculate_max_low_pfn(max_low_pfn);

#ifdef DEBUG_MAPPED_KERNEL
	printk("max_low_pfn = 0x%lx\n", max_low_pfn);
#endif

	/*
	 * Initialize the boot-time allocator with low memory only.
	 */
	bootmap_size = init_bootmem_node(NODE_DATA(0), mapstart,
					 min_low_pfn, max_low_pfn);


	for (i = 0; i < boot_mem_map.nr_map; i++) {
		unsigned long start, end;

		start = PFN_UP(boot_mem_map.map[i].addr);
		end = PFN_DOWN(boot_mem_map.map[i].addr
				+ boot_mem_map.map[i].size - 1);

		if (start <= min_low_pfn)
			start = min_low_pfn;
		if (start >= end)
			continue;

#ifndef CONFIG_HIGHMEM
		if (end > max_low_pfn)
			end = max_low_pfn;

		/*
		 * ... finally, is the area going away?
		 */
		if (end <= start)
			continue;
#endif

		add_active_range(0, start, end);
	}

	/*
	 * Register fully available low RAM pages with the bootmem allocator.
	 */
	for (i = 0; i < boot_mem_map.nr_map; i++) {
		unsigned long start, end, size;

		/*
		 * Reserve usable memory.
		 */
		if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
			continue;

		start = PFN_UP(boot_mem_map.map[i].addr);
		end   = PFN_DOWN(boot_mem_map.map[i].addr
				    + boot_mem_map.map[i].size - 1);
		/*
		 * We are rounding up the start address of usable memory
		 * and at the end of the usable range downwards.
		 */
		if (start >= max_low_pfn)
			continue;
		if (start < reserved_end)
			start = reserved_end;
		if (end > max_low_pfn)
			end = max_low_pfn;

		/*
		 * ... finally, is the area going away?
		 */
		if (end <= start)
			continue;
		size = end - start;

		/* Register lowmem ranges */
		free_bootmem(PFN_PHYS(start), size << PAGE_SHIFT);
		memory_present(0, start, end);
	}

	/*
	 * Reserve the bootmap memory.
	 */
	reserve_bootmem(PFN_PHYS(mapstart), bootmap_size, BOOTMEM_DEFAULT);

	/*
	 * Reserve initrd memory if needed.
	 */
	finalize_initrd();
}