[deliverable/linux.git] / arch / ia64 / mm / contig.c

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 1998-2003 Hewlett-Packard Co
 *	David Mosberger-Tang <davidm@hpl.hp.com>
 *	Stephane Eranian <eranian@hpl.hp.com>
 * Copyright (C) 2000, Rohit Seth <rohit.seth@intel.com>
 * Copyright (C) 1999 VA Linux Systems
 * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
 * Copyright (C) 2003 Silicon Graphics, Inc. All rights reserved.
 *
 * Routines used by ia64 machines with contiguous (or virtually contiguous)
 * memory.
 */
#include <linux/bootmem.h>
#include <linux/efi.h>
#include <linux/mm.h>
#include <linux/nmi.h>
#include <linux/swap.h>

#include <asm/meminit.h>
#include <asm/pgalloc.h>
#include <asm/pgtable.h>
#include <asm/sections.h>
#include <asm/mca.h>

#ifdef CONFIG_VIRTUAL_MEM_MAP
static unsigned long max_gap;
#endif

/**
 * show_mem - give short summary of memory stats
 *
 * Shows a simple page count of reserved and used pages in the system.
 * For discontig machines, it does this on a per-pgdat basis.
 */
void show_mem(unsigned int filter)
{
	int i, total_reserved = 0;
	int total_shared = 0, total_cached = 0;
	unsigned long total_present = 0;
	pg_data_t *pgdat;

	printk(KERN_INFO "Mem-info:\n");
	show_free_areas();
	printk(KERN_INFO "Node memory in pages:\n");
	for_each_online_pgdat(pgdat) {
		unsigned long present;
		unsigned long flags;
		int shared = 0, cached = 0, reserved = 0;

		pgdat_resize_lock(pgdat, &flags);
		present = pgdat->node_present_pages;
		for(i = 0; i < pgdat->node_spanned_pages; i++) {
			struct page *page;
			if (unlikely(i % MAX_ORDER_NR_PAGES == 0))
				touch_nmi_watchdog();
			if (pfn_valid(pgdat->node_start_pfn + i))
				page = pfn_to_page(pgdat->node_start_pfn + i);
			else {
#ifdef CONFIG_VIRTUAL_MEM_MAP
				if (max_gap < LARGE_GAP)
					continue;
#endif
				i = vmemmap_find_next_valid_pfn(pgdat->node_id,
					 i) - 1;
				continue;
			}
			if (PageReserved(page))
				reserved++;
			else if (PageSwapCache(page))
				cached++;
			else if (page_count(page))
				shared += page_count(page)-1;
		}
		pgdat_resize_unlock(pgdat, &flags);
		total_present += present;
		total_reserved += reserved;
		total_cached += cached;
		total_shared += shared;
		printk(KERN_INFO "Node %4d:  RAM: %11ld, rsvd: %8d, "
		       "shrd: %10d, swpd: %10d\n", pgdat->node_id,
		       present, reserved, shared, cached);
	}
	printk(KERN_INFO "%ld pages of RAM\n", total_present);
	printk(KERN_INFO "%d reserved pages\n", total_reserved);
	printk(KERN_INFO "%d pages shared\n", total_shared);
	printk(KERN_INFO "%d pages swap cached\n", total_cached);
	printk(KERN_INFO "Total of %ld pages in page table cache\n",
	       quicklist_total_size());
	printk(KERN_INFO "%d free buffer pages\n", nr_free_buffer_pages());
}


/* physical address where the bootmem map is located */
unsigned long bootmap_start;

/**
 * find_bootmap_location - callback to find a memory area for the bootmap
 * @start: start of region
 * @end: end of region
 * @arg: unused callback data
 *
 * Find a place to put the bootmap and return its starting address in
 * bootmap_start.  This address must be page-aligned.
 */
static int __init
find_bootmap_location (u64 start, u64 end, void *arg)
{
	u64 needed = *(unsigned long *)arg;
	u64 range_start, range_end, free_start;
	int i;

#if IGNORE_PFN0
	if (start == PAGE_OFFSET) {
		start += PAGE_SIZE;
		if (start >= end)
			return 0;
	}
#endif

	free_start = PAGE_OFFSET;

	for (i = 0; i < num_rsvd_regions; i++) {
		range_start = max(start, free_start);
		range_end   = min(end, rsvd_region[i].start & PAGE_MASK);

		free_start = PAGE_ALIGN(rsvd_region[i].end);

		if (range_end <= range_start)
			continue; /* skip over empty range */

		if (range_end - range_start >= needed) {
			bootmap_start = __pa(range_start);
			return -1;	/* done */
		}

		/* nothing more available in this segment */
		if (range_end == end)
			return 0;
	}
	return 0;
}

#ifdef CONFIG_SMP
static void *cpu_data;
/**
 * per_cpu_init - setup per-cpu variables
 *
 * Allocate and setup per-cpu data areas.
 */
void * __cpuinit
per_cpu_init (void)
{
	static bool first_time = true;
	void *cpu0_data = __cpu0_per_cpu;
	unsigned int cpu;

	if (!first_time)
		goto skip;
	first_time = false;

	/*
	 * get_free_pages() cannot be used before cpu_init() done.
	 * BSP allocates PERCPU_PAGE_SIZE bytes for all possible CPUs
	 * to avoid that AP calls get_zeroed_page().
	 */
	for_each_possible_cpu(cpu) {
		void *src = cpu == 0 ? cpu0_data : __phys_per_cpu_start;

		memcpy(cpu_data, src, __per_cpu_end - __per_cpu_start);
		__per_cpu_offset[cpu] = (char *)cpu_data - __per_cpu_start;
		per_cpu(local_per_cpu_offset, cpu) = __per_cpu_offset[cpu];

		/*
		 * percpu area for cpu0 is moved from the __init area
		 * which is setup by head.S and used till this point.
		 * Update ar.k3.  This move is ensures that percpu
		 * area for cpu0 is on the correct node and its
		 * virtual address isn't insanely far from other
		 * percpu areas which is important for congruent
		 * percpu allocator.
		 */
		if (cpu == 0)
			ia64_set_kr(IA64_KR_PER_CPU_DATA, __pa(cpu_data) -
				    (unsigned long)__per_cpu_start);

		cpu_data += PERCPU_PAGE_SIZE;
	}
skip:
	return __per_cpu_start + __per_cpu_offset[smp_processor_id()];
}

static inline void
alloc_per_cpu_data(void)
{
	cpu_data = __alloc_bootmem(PERCPU_PAGE_SIZE * num_possible_cpus(),
				   PERCPU_PAGE_SIZE, __pa(MAX_DMA_ADDRESS));
}

/**
 * setup_per_cpu_areas - setup percpu areas
 *
 * Arch code has already allocated and initialized percpu areas.  All
 * this function has to do is to teach the determined layout to the
 * dynamic percpu allocator, which happens to be more complex than
 * creating whole new ones using helpers.
 */
void __init
setup_per_cpu_areas(void)
{
	struct pcpu_alloc_info *ai;
	struct pcpu_group_info *gi;
	unsigned int cpu;
	ssize_t static_size, reserved_size, dyn_size;
	int rc;

	ai = pcpu_alloc_alloc_info(1, num_possible_cpus());
	if (!ai)
		panic("failed to allocate pcpu_alloc_info");
	gi = &ai->groups[0];

	/* units are assigned consecutively to possible cpus */
	for_each_possible_cpu(cpu)
		gi->cpu_map[gi->nr_units++] = cpu;

	/* set parameters */
	static_size = __per_cpu_end - __per_cpu_start;
	reserved_size = PERCPU_MODULE_RESERVE;
	dyn_size = PERCPU_PAGE_SIZE - static_size - reserved_size;
	if (dyn_size < 0)
		panic("percpu area overflow static=%zd reserved=%zd\n",
		      static_size, reserved_size);

	ai->static_size		= static_size;
	ai->reserved_size	= reserved_size;
	ai->dyn_size		= dyn_size;
	ai->unit_size		= PERCPU_PAGE_SIZE;
	ai->atom_size		= PAGE_SIZE;
	ai->alloc_size		= PERCPU_PAGE_SIZE;

	rc = pcpu_setup_first_chunk(ai, __per_cpu_start + __per_cpu_offset[0]);
	if (rc)
		panic("failed to setup percpu area (err=%d)", rc);

	pcpu_free_alloc_info(ai);
}
#else
#define alloc_per_cpu_data() do { } while (0)
#endif /* CONFIG_SMP */

/**
 * find_memory - setup memory map
 *
 * Walk the EFI memory map and find usable memory for the system, taking
 * into account reserved areas.
 */
void __init
find_memory (void)
{
	unsigned long bootmap_size;

	reserve_memory();

	/* first find highest page frame number */
	min_low_pfn = ~0UL;
	max_low_pfn = 0;
	efi_memmap_walk(find_max_min_low_pfn, NULL);
	max_pfn = max_low_pfn;
	/* how many bytes to cover all the pages */
	bootmap_size = bootmem_bootmap_pages(max_pfn) << PAGE_SHIFT;

	/* look for a location to hold the bootmap */
	bootmap_start = ~0UL;
	efi_memmap_walk(find_bootmap_location, &bootmap_size);
	if (bootmap_start == ~0UL)
		panic("Cannot find %ld bytes for bootmap\n", bootmap_size);

	bootmap_size = init_bootmem_node(NODE_DATA(0),
			(bootmap_start >> PAGE_SHIFT), 0, max_pfn);

	/* Free all available memory, then mark bootmem-map as being in use. */
	efi_memmap_walk(filter_rsvd_memory, free_bootmem);
	reserve_bootmem(bootmap_start, bootmap_size, BOOTMEM_DEFAULT);

	find_initrd();

	alloc_per_cpu_data();
}

static int count_pages(u64 start, u64 end, void *arg)
{
	unsigned long *count = arg;

	*count += (end - start) >> PAGE_SHIFT;
	return 0;
}

/*
 * Set up the page tables.
 */

void __init
paging_init (void)
{
	unsigned long max_dma;
	unsigned long max_zone_pfns[MAX_NR_ZONES];

	num_physpages = 0;
	efi_memmap_walk(count_pages, &num_physpages);

	memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
#ifdef CONFIG_ZONE_DMA
	max_dma = virt_to_phys((void *) MAX_DMA_ADDRESS) >> PAGE_SHIFT;
	max_zone_pfns[ZONE_DMA] = max_dma;
#endif
	max_zone_pfns[ZONE_NORMAL] = max_low_pfn;

#ifdef CONFIG_VIRTUAL_MEM_MAP
	efi_memmap_walk(filter_memory, register_active_ranges);
	efi_memmap_walk(find_largest_hole, (u64 *)&max_gap);
	if (max_gap < LARGE_GAP) {
		vmem_map = (struct page *) 0;
		free_area_init_nodes(max_zone_pfns);
	} else {
		unsigned long map_size;

		/* allocate virtual_mem_map */

		map_size = PAGE_ALIGN(ALIGN(max_low_pfn, MAX_ORDER_NR_PAGES) *
			sizeof(struct page));
		VMALLOC_END -= map_size;
		vmem_map = (struct page *) VMALLOC_END;
		efi_memmap_walk(create_mem_map_page_table, NULL);

		/*
		 * alloc_node_mem_map makes an adjustment for mem_map
		 * which isn't compatible with vmem_map.
		 */
		NODE_DATA(0)->node_mem_map = vmem_map +
			find_min_pfn_with_active_regions();
		free_area_init_nodes(max_zone_pfns);

		printk("Virtual mem_map starts at 0x%p\n", mem_map);
	}
#else /* !CONFIG_VIRTUAL_MEM_MAP */
	add_active_range(0, 0, max_low_pfn);
	free_area_init_nodes(max_zone_pfns);
#endif /* !CONFIG_VIRTUAL_MEM_MAP */
	zero_page_memmap_ptr = virt_to_page(ia64_imva(empty_zero_page));
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* This file is subject to the terms and conditions of the GNU General Public
	3	* License. See the file "COPYING" in the main directory of this archive
	4	* for more details.
	5	*
	6	* Copyright (C) 1998-2003 Hewlett-Packard Co
	7	* David Mosberger-Tang <davidm@hpl.hp.com>
	8	* Stephane Eranian <eranian@hpl.hp.com>
	9	* Copyright (C) 2000, Rohit Seth <rohit.seth@intel.com>
	10	* Copyright (C) 1999 VA Linux Systems
	11	* Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
	12	* Copyright (C) 2003 Silicon Graphics, Inc. All rights reserved.
	13	*
	14	* Routines used by ia64 machines with contiguous (or virtually contiguous)
	15	* memory.
	16	*/
1da177e4 LT	17	#include <linux/bootmem.h>
	18	#include <linux/efi.h>
	19	#include <linux/mm.h>
99a19cf1	20	#include <linux/nmi.h>
1da177e4 LT	21	#include <linux/swap.h>
	22
	23	#include <asm/meminit.h>
	24	#include <asm/pgalloc.h>
	25	#include <asm/pgtable.h>
	26	#include <asm/sections.h>
	27	#include <asm/mca.h>
	28
	29	#ifdef CONFIG_VIRTUAL_MEM_MAP
e44e41d0	30	static unsigned long max_gap;
1da177e4 LT	31	#endif
	32
	33	/**
f1c0afa2	34	* show_mem - give short summary of memory stats
1da177e4	35	*
f1c0afa2 GB	36	* Shows a simple page count of reserved and used pages in the system.
f1c0afa2 GB	37	* For discontig machines, it does this on a per-pgdat basis.
1da177e4	38	*/
b2b755b5	39	void show_mem(unsigned int filter)
1da177e4	40	{
f1c0afa2 GB	41	int i, total_reserved = 0;
	42	int total_shared = 0, total_cached = 0;
	43	unsigned long total_present = 0;
	44	pg_data_t *pgdat;
1da177e4	45
709a6c1c	46	printk(KERN_INFO "Mem-info:\n");
1da177e4	47	show_free_areas();
f1c0afa2 GB	48	printk(KERN_INFO "Node memory in pages:\n");
	49	for_each_online_pgdat(pgdat) {
	50	unsigned long present;
	51	unsigned long flags;
	52	int shared = 0, cached = 0, reserved = 0;
	53
	54	pgdat_resize_lock(pgdat, &flags);
	55	present = pgdat->node_present_pages;
	56	for(i = 0; i < pgdat->node_spanned_pages; i++) {
	57	struct page *page;
99a19cf1 PB	58	if (unlikely(i % MAX_ORDER_NR_PAGES == 0))
99a19cf1 PB	59	touch_nmi_watchdog();
f1c0afa2 GB	60	if (pfn_valid(pgdat->node_start_pfn + i))
	61	page = pfn_to_page(pgdat->node_start_pfn + i);
	62	else {
e44e41d0	63	#ifdef CONFIG_VIRTUAL_MEM_MAP
f1c0afa2 GB	64	if (max_gap < LARGE_GAP)
f1c0afa2 GB	65	continue;
e44e41d0	66	#endif
f1c0afa2 GB	67	i = vmemmap_find_next_valid_pfn(pgdat->node_id,
	68	i) - 1;
	69	continue;
	70	}
	71	if (PageReserved(page))
	72	reserved++;
	73	else if (PageSwapCache(page))
	74	cached++;
	75	else if (page_count(page))
	76	shared += page_count(page)-1;
e44e41d0	77	}
f1c0afa2 GB	78	pgdat_resize_unlock(pgdat, &flags);
	79	total_present += present;
	80	total_reserved += reserved;
	81	total_cached += cached;
	82	total_shared += shared;
	83	printk(KERN_INFO "Node %4d: RAM: %11ld, rsvd: %8d, "
	84	"shrd: %10d, swpd: %10d\n", pgdat->node_id,
	85	present, reserved, shared, cached);
1da177e4	86	}
f1c0afa2 GB	87	printk(KERN_INFO "%ld pages of RAM\n", total_present);
	88	printk(KERN_INFO "%d reserved pages\n", total_reserved);
	89	printk(KERN_INFO "%d pages shared\n", total_shared);
	90	printk(KERN_INFO "%d pages swap cached\n", total_cached);
	91	printk(KERN_INFO "Total of %ld pages in page table cache\n",
2bd62a40	92	quicklist_total_size());
f1c0afa2	93	printk(KERN_INFO "%d free buffer pages\n", nr_free_buffer_pages());
1da177e4 LT	94	}
1da177e4 LT	95
f1c0afa2	96
1da177e4 LT	97	/* physical address where the bootmem map is located */
	98	unsigned long bootmap_start;
	99
1da177e4 LT	100	/**
	101	* find_bootmap_location - callback to find a memory area for the bootmap
	102	* @start: start of region
	103	* @end: end of region
	104	* @arg: unused callback data
	105	*
	106	* Find a place to put the bootmap and return its starting address in
	107	* bootmap_start. This address must be page-aligned.
	108	*/
dae28066	109	static int __init
e088a4ad	110	find_bootmap_location (u64 start, u64 end, void *arg)
1da177e4	111	{
e088a4ad MW	112	u64 needed = (unsigned long )arg;
e088a4ad MW	113	u64 range_start, range_end, free_start;
1da177e4 LT	114	int i;
	115
	116	#if IGNORE_PFN0
	117	if (start == PAGE_OFFSET) {
	118	start += PAGE_SIZE;
	119	if (start >= end)
	120	return 0;
	121	}
	122	#endif
	123
	124	free_start = PAGE_OFFSET;
	125
	126	for (i = 0; i < num_rsvd_regions; i++) {
	127	range_start = max(start, free_start);
	128	range_end = min(end, rsvd_region[i].start & PAGE_MASK);
	129
	130	free_start = PAGE_ALIGN(rsvd_region[i].end);
	131
	132	if (range_end <= range_start)
	133	continue; /* skip over empty range */
	134
	135	if (range_end - range_start >= needed) {
	136	bootmap_start = __pa(range_start);
	137	return -1; /* done */
	138	}
	139
	140	/* nothing more available in this segment */
	141	if (range_end == end)
	142	return 0;
	143	}
	144	return 0;
	145	}
	146
4b9ddc7c TL	147	#ifdef CONFIG_SMP
	148	static void *cpu_data;
	149	/**
	150	* per_cpu_init - setup per-cpu variables
	151	*
	152	* Allocate and setup per-cpu data areas.
	153	*/
	154	void * __cpuinit
	155	per_cpu_init (void)
	156	{
36886478 TH	157	static bool first_time = true;
	158	void *cpu0_data = __cpu0_per_cpu;
	159	unsigned int cpu;
	160
	161	if (!first_time)
	162	goto skip;
	163	first_time = false;
4b9ddc7c TL	164
4b9ddc7c TL	165	/*
52594762 TH	166	* get_free_pages() cannot be used before cpu_init() done.
	167	* BSP allocates PERCPU_PAGE_SIZE bytes for all possible CPUs
	168	* to avoid that AP calls get_zeroed_page().
4b9ddc7c	169	*/
52594762	170	for_each_possible_cpu(cpu) {
36886478 TH	171	void *src = cpu == 0 ? cpu0_data : __phys_per_cpu_start;
	172
	173	memcpy(cpu_data, src, __per_cpu_end - __per_cpu_start);
	174	__per_cpu_offset[cpu] = (char *)cpu_data - __per_cpu_start;
	175	per_cpu(local_per_cpu_offset, cpu) = __per_cpu_offset[cpu];
	176
	177	/*
	178	* percpu area for cpu0 is moved from the __init area
	179	* which is setup by head.S and used till this point.
	180	* Update ar.k3. This move is ensures that percpu
	181	* area for cpu0 is on the correct node and its
	182	* virtual address isn't insanely far from other
	183	* percpu areas which is important for congruent
	184	* percpu allocator.
	185	*/
	186	if (cpu == 0)
	187	ia64_set_kr(IA64_KR_PER_CPU_DATA, __pa(cpu_data) -
	188	(unsigned long)__per_cpu_start);
	189
	190	cpu_data += PERCPU_PAGE_SIZE;
4b9ddc7c	191	}
36886478	192	skip:
4b9ddc7c TL	193	return __per_cpu_start + __per_cpu_offset[smp_processor_id()];
	194	}
	195
	196	static inline void
	197	alloc_per_cpu_data(void)
	198	{
52594762	199	cpu_data = __alloc_bootmem(PERCPU_PAGE_SIZE * num_possible_cpus(),
4b9ddc7c TL	200	PERCPU_PAGE_SIZE, __pa(MAX_DMA_ADDRESS));
4b9ddc7c TL	201	}
52594762 TH	202
	203	/**
	204	* setup_per_cpu_areas - setup percpu areas
	205	*
	206	* Arch code has already allocated and initialized percpu areas. All
	207	* this function has to do is to teach the determined layout to the
	208	* dynamic percpu allocator, which happens to be more complex than
	209	* creating whole new ones using helpers.
	210	*/
	211	void __init
	212	setup_per_cpu_areas(void)
	213	{
	214	struct pcpu_alloc_info *ai;
	215	struct pcpu_group_info *gi;
	216	unsigned int cpu;
	217	ssize_t static_size, reserved_size, dyn_size;
	218	int rc;
	219
	220	ai = pcpu_alloc_alloc_info(1, num_possible_cpus());
	221	if (!ai)
	222	panic("failed to allocate pcpu_alloc_info");
	223	gi = &ai->groups[0];
	224
	225	/* units are assigned consecutively to possible cpus */
	226	for_each_possible_cpu(cpu)
	227	gi->cpu_map[gi->nr_units++] = cpu;
	228
	229	/* set parameters */
	230	static_size = __per_cpu_end - __per_cpu_start;
	231	reserved_size = PERCPU_MODULE_RESERVE;
	232	dyn_size = PERCPU_PAGE_SIZE - static_size - reserved_size;
	233	if (dyn_size < 0)
	234	panic("percpu area overflow static=%zd reserved=%zd\n",
	235	static_size, reserved_size);
	236
	237	ai->static_size = static_size;
	238	ai->reserved_size = reserved_size;
	239	ai->dyn_size = dyn_size;
	240	ai->unit_size = PERCPU_PAGE_SIZE;
	241	ai->atom_size = PAGE_SIZE;
	242	ai->alloc_size = PERCPU_PAGE_SIZE;
	243
	244	rc = pcpu_setup_first_chunk(ai, __per_cpu_start + __per_cpu_offset[0]);
	245	if (rc)
	246	panic("failed to setup percpu area (err=%d)", rc);
	247
	248	pcpu_free_alloc_info(ai);
	249	}
4b9ddc7c TL	250	#else
	251	#define alloc_per_cpu_data() do { } while (0)
	252	#endif /* CONFIG_SMP */
	253
1da177e4 LT	254	/**
	255	* find_memory - setup memory map
	256	*
	257	* Walk the EFI memory map and find usable memory for the system, taking
	258	* into account reserved areas.
	259	*/
dae28066	260	void __init
1da177e4 LT	261	find_memory (void)
	262	{
	263	unsigned long bootmap_size;
	264
	265	reserve_memory();
	266
	267	/* first find highest page frame number */
a3f5c338 ZN	268	min_low_pfn = ~0UL;
	269	max_low_pfn = 0;
	270	efi_memmap_walk(find_max_min_low_pfn, NULL);
	271	max_pfn = max_low_pfn;
1da177e4 LT	272	/* how many bytes to cover all the pages */
	273	bootmap_size = bootmem_bootmap_pages(max_pfn) << PAGE_SHIFT;
	274
	275	/* look for a location to hold the bootmap */
	276	bootmap_start = ~0UL;
	277	efi_memmap_walk(find_bootmap_location, &bootmap_size);
	278	if (bootmap_start == ~0UL)
	279	panic("Cannot find %ld bytes for bootmap\n", bootmap_size);
	280
a3f5c338 ZN	281	bootmap_size = init_bootmem_node(NODE_DATA(0),
a3f5c338 ZN	282	(bootmap_start >> PAGE_SHIFT), 0, max_pfn);
1da177e4 LT	283
	284	/* Free all available memory, then mark bootmem-map as being in use. */
	285	efi_memmap_walk(filter_rsvd_memory, free_bootmem);
72a7fe39	286	reserve_bootmem(bootmap_start, bootmap_size, BOOTMEM_DEFAULT);
1da177e4 LT	287
1da177e4 LT	288	find_initrd();
45a98fc6	289
4b9ddc7c	290	alloc_per_cpu_data();
1da177e4 LT	291	}
1da177e4 LT	292
e088a4ad	293	static int count_pages(u64 start, u64 end, void *arg)
1da177e4 LT	294	{
	295	unsigned long *count = arg;
	296
	297	*count += (end - start) >> PAGE_SHIFT;
	298	return 0;
	299	}
	300
1da177e4 LT	301	/*
	302	* Set up the page tables.
	303	*/
	304
dae28066	305	void __init
1da177e4 LT	306	paging_init (void)
	307	{
	308	unsigned long max_dma;
05e0caad	309	unsigned long max_zone_pfns[MAX_NR_ZONES];
1da177e4 LT	310
	311	num_physpages = 0;
	312	efi_memmap_walk(count_pages, &num_physpages);
	313
6391af17	314	memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
09ae1f58 CL	315	#ifdef CONFIG_ZONE_DMA
09ae1f58 CL	316	max_dma = virt_to_phys((void *) MAX_DMA_ADDRESS) >> PAGE_SHIFT;
05e0caad	317	max_zone_pfns[ZONE_DMA] = max_dma;
09ae1f58	318	#endif
05e0caad	319	max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
1da177e4 LT	320
1da177e4 LT	321	#ifdef CONFIG_VIRTUAL_MEM_MAP
98075d24	322	efi_memmap_walk(filter_memory, register_active_ranges);
1da177e4 LT	323	efi_memmap_walk(find_largest_hole, (u64 *)&max_gap);
	324	if (max_gap < LARGE_GAP) {
	325	vmem_map = (struct page *) 0;
05e0caad	326	free_area_init_nodes(max_zone_pfns);
1da177e4 LT	327	} else {
	328	unsigned long map_size;
	329
	330	/* allocate virtual_mem_map */
	331
921eea1c BP	332	map_size = PAGE_ALIGN(ALIGN(max_low_pfn, MAX_ORDER_NR_PAGES) *
921eea1c BP	333	sizeof(struct page));
126b3fcd TH	334	VMALLOC_END -= map_size;
126b3fcd TH	335	vmem_map = (struct page *) VMALLOC_END;
1da177e4 LT	336	efi_memmap_walk(create_mem_map_page_table, NULL);
1da177e4 LT	337
05e0caad MG	338	/*
	339	* alloc_node_mem_map makes an adjustment for mem_map
	340	* which isn't compatible with vmem_map.
	341	*/
	342	NODE_DATA(0)->node_mem_map = vmem_map +
	343	find_min_pfn_with_active_regions();
	344	free_area_init_nodes(max_zone_pfns);
1da177e4 LT	345
	346	printk("Virtual mem_map starts at 0x%p\n", mem_map);
	347	}
	348	#else /* !CONFIG_VIRTUAL_MEM_MAP */
05e0caad MG	349	add_active_range(0, 0, max_low_pfn);
05e0caad MG	350	free_area_init_nodes(max_zone_pfns);
1da177e4 LT	351	#endif /* !CONFIG_VIRTUAL_MEM_MAP */
	352	zero_page_memmap_ptr = virt_to_page(ia64_imva(empty_zero_page));
	353	}