[deliverable/linux.git] / arch / x86 / mm / init.c

#include <linux/gfp.h>
#include <linux/initrd.h>
#include <linux/ioport.h>
#include <linux/swap.h>
#include <linux/memblock.h>
#include <linux/bootmem.h>	/* for max_low_pfn */

#include <asm/cacheflush.h>
#include <asm/e820.h>
#include <asm/init.h>
#include <asm/page.h>
#include <asm/page_types.h>
#include <asm/sections.h>
#include <asm/setup.h>
#include <asm/tlbflush.h>
#include <asm/tlb.h>
#include <asm/proto.h>
#include <asm/dma.h>		/* for MAX_DMA_PFN */

unsigned long __initdata pgt_buf_start;
unsigned long __meminitdata pgt_buf_end;
unsigned long __meminitdata pgt_buf_top;

int after_bootmem;

int direct_gbpages
#ifdef CONFIG_DIRECT_GBPAGES
				= 1
#endif
;

struct map_range {
	unsigned long start;
	unsigned long end;
	unsigned page_size_mask;
};

static void __init find_early_table_space(struct map_range *mr, unsigned long end,
					  int use_pse, int use_gbpages)
{
	unsigned long puds, pmds, ptes, tables, start = 0, good_end = end;
	phys_addr_t base;

	puds = (end + PUD_SIZE - 1) >> PUD_SHIFT;
	tables = roundup(puds * sizeof(pud_t), PAGE_SIZE);

	if (use_gbpages) {
		unsigned long extra;

		extra = end - ((end>>PUD_SHIFT) << PUD_SHIFT);
		pmds = (extra + PMD_SIZE - 1) >> PMD_SHIFT;
	} else
		pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT;

	tables += roundup(pmds * sizeof(pmd_t), PAGE_SIZE);

	if (use_pse) {
		unsigned long extra;

		extra = end - ((end>>PMD_SHIFT) << PMD_SHIFT);
#ifdef CONFIG_X86_32
		extra += PMD_SIZE;
#endif
		/* The first 2/4M doesn't use large pages. */
		if (mr->start < PMD_SIZE)
			extra += mr->end - mr->start;

		ptes = (extra + PAGE_SIZE - 1) >> PAGE_SHIFT;
	} else
		ptes = (end + PAGE_SIZE - 1) >> PAGE_SHIFT;

	tables += roundup(ptes * sizeof(pte_t), PAGE_SIZE);

#ifdef CONFIG_X86_32
	/* for fixmap */
	tables += roundup(__end_of_fixed_addresses * sizeof(pte_t), PAGE_SIZE);
#endif
	good_end = max_pfn_mapped << PAGE_SHIFT;

	base = memblock_find_in_range(start, good_end, tables, PAGE_SIZE);
	if (!base)
		panic("Cannot find space for the kernel page tables");

	pgt_buf_start = base >> PAGE_SHIFT;
	pgt_buf_end = pgt_buf_start;
	pgt_buf_top = pgt_buf_start + (tables >> PAGE_SHIFT);

	printk(KERN_DEBUG "kernel direct mapping tables up to %#lx @ [mem %#010lx-%#010lx]\n",
		end - 1, pgt_buf_start << PAGE_SHIFT,
		(pgt_buf_top << PAGE_SHIFT) - 1);
}

void __init native_pagetable_reserve(u64 start, u64 end)
{
	memblock_reserve(start, end - start);
}

#ifdef CONFIG_X86_32
#define NR_RANGE_MR 3
#else /* CONFIG_X86_64 */
#define NR_RANGE_MR 5
#endif

static int __meminit save_mr(struct map_range *mr, int nr_range,
			     unsigned long start_pfn, unsigned long end_pfn,
			     unsigned long page_size_mask)
{
	if (start_pfn < end_pfn) {
		if (nr_range >= NR_RANGE_MR)
			panic("run out of range for init_memory_mapping\n");
		mr[nr_range].start = start_pfn<<PAGE_SHIFT;
		mr[nr_range].end   = end_pfn<<PAGE_SHIFT;
		mr[nr_range].page_size_mask = page_size_mask;
		nr_range++;
	}

	return nr_range;
}

/*
 * Setup the direct mapping of the physical memory at PAGE_OFFSET.
 * This runs before bootmem is initialized and gets pages directly from
 * the physical memory. To access them they are temporarily mapped.
 */
unsigned long __init_refok init_memory_mapping(unsigned long start,
					       unsigned long end)
{
	unsigned long page_size_mask = 0;
	unsigned long start_pfn, end_pfn;
	unsigned long ret = 0;
	unsigned long pos;

	struct map_range mr[NR_RANGE_MR];
	int nr_range, i;
	int use_pse, use_gbpages;

	printk(KERN_INFO "init_memory_mapping: [mem %#010lx-%#010lx]\n",
	       start, end - 1);

#if defined(CONFIG_DEBUG_PAGEALLOC) || defined(CONFIG_KMEMCHECK)
	/*
	 * For CONFIG_DEBUG_PAGEALLOC, identity mapping will use small pages.
	 * This will simplify cpa(), which otherwise needs to support splitting
	 * large pages into small in interrupt context, etc.
	 */
	use_pse = use_gbpages = 0;
#else
	use_pse = cpu_has_pse;
	use_gbpages = direct_gbpages;
#endif

	/* Enable PSE if available */
	if (cpu_has_pse)
		set_in_cr4(X86_CR4_PSE);

	/* Enable PGE if available */
	if (cpu_has_pge) {
		set_in_cr4(X86_CR4_PGE);
		__supported_pte_mask |= _PAGE_GLOBAL;
	}

	if (use_gbpages)
		page_size_mask |= 1 << PG_LEVEL_1G;
	if (use_pse)
		page_size_mask |= 1 << PG_LEVEL_2M;

	memset(mr, 0, sizeof(mr));
	nr_range = 0;

	/* head if not big page alignment ? */
	start_pfn = start >> PAGE_SHIFT;
	pos = start_pfn << PAGE_SHIFT;
#ifdef CONFIG_X86_32
	/*
	 * Don't use a large page for the first 2/4MB of memory
	 * because there are often fixed size MTRRs in there
	 * and overlapping MTRRs into large pages can cause
	 * slowdowns.
	 */
	if (pos == 0)
		end_pfn = 1<<(PMD_SHIFT - PAGE_SHIFT);
	else
		end_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT)
				 << (PMD_SHIFT - PAGE_SHIFT);
#else /* CONFIG_X86_64 */
	end_pfn = ((pos + (PMD_SIZE - 1)) >> PMD_SHIFT)
			<< (PMD_SHIFT - PAGE_SHIFT);
#endif
	if (end_pfn > (end >> PAGE_SHIFT))
		end_pfn = end >> PAGE_SHIFT;
	if (start_pfn < end_pfn) {
		nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0);
		pos = end_pfn << PAGE_SHIFT;
	}

	/* big page (2M) range */
	start_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT)
			 << (PMD_SHIFT - PAGE_SHIFT);
#ifdef CONFIG_X86_32
	end_pfn = (end>>PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT);
#else /* CONFIG_X86_64 */
	end_pfn = ((pos + (PUD_SIZE - 1))>>PUD_SHIFT)
			 << (PUD_SHIFT - PAGE_SHIFT);
	if (end_pfn > ((end>>PMD_SHIFT)<<(PMD_SHIFT - PAGE_SHIFT)))
		end_pfn = ((end>>PMD_SHIFT)<<(PMD_SHIFT - PAGE_SHIFT));
#endif

	if (start_pfn < end_pfn) {
		nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
				page_size_mask & (1<<PG_LEVEL_2M));
		pos = end_pfn << PAGE_SHIFT;
	}

#ifdef CONFIG_X86_64
	/* big page (1G) range */
	start_pfn = ((pos + (PUD_SIZE - 1))>>PUD_SHIFT)
			 << (PUD_SHIFT - PAGE_SHIFT);
	end_pfn = (end >> PUD_SHIFT) << (PUD_SHIFT - PAGE_SHIFT);
	if (start_pfn < end_pfn) {
		nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
				page_size_mask &
				 ((1<<PG_LEVEL_2M)|(1<<PG_LEVEL_1G)));
		pos = end_pfn << PAGE_SHIFT;
	}

	/* tail is not big page (1G) alignment */
	start_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT)
			 << (PMD_SHIFT - PAGE_SHIFT);
	end_pfn = (end >> PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT);
	if (start_pfn < end_pfn) {
		nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
				page_size_mask & (1<<PG_LEVEL_2M));
		pos = end_pfn << PAGE_SHIFT;
	}
#endif

	/* tail is not big page (2M) alignment */
	start_pfn = pos>>PAGE_SHIFT;
	end_pfn = end>>PAGE_SHIFT;
	nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0);

	/* try to merge same page size and continuous */
	for (i = 0; nr_range > 1 && i < nr_range - 1; i++) {
		unsigned long old_start;
		if (mr[i].end != mr[i+1].start ||
		    mr[i].page_size_mask != mr[i+1].page_size_mask)
			continue;
		/* move it */
		old_start = mr[i].start;
		memmove(&mr[i], &mr[i+1],
			(nr_range - 1 - i) * sizeof(struct map_range));
		mr[i--].start = old_start;
		nr_range--;
	}

	for (i = 0; i < nr_range; i++)
		printk(KERN_DEBUG " [mem %#010lx-%#010lx] page %s\n",
				mr[i].start, mr[i].end - 1,
			(mr[i].page_size_mask & (1<<PG_LEVEL_1G))?"1G":(
			 (mr[i].page_size_mask & (1<<PG_LEVEL_2M))?"2M":"4k"));

	/*
	 * Find space for the kernel direct mapping tables.
	 *
	 * Later we should allocate these tables in the local node of the
	 * memory mapped. Unfortunately this is done currently before the
	 * nodes are discovered.
	 */
	if (!after_bootmem)
		find_early_table_space(&mr[0], end, use_pse, use_gbpages);

	for (i = 0; i < nr_range; i++)
		ret = kernel_physical_mapping_init(mr[i].start, mr[i].end,
						   mr[i].page_size_mask);

#ifdef CONFIG_X86_32
	early_ioremap_page_table_range_init();

	load_cr3(swapper_pg_dir);
#endif

	__flush_tlb_all();

	/*
	 * Reserve the kernel pagetable pages we used (pgt_buf_start -
	 * pgt_buf_end) and free the other ones (pgt_buf_end - pgt_buf_top)
	 * so that they can be reused for other purposes.
	 *
	 * On native it just means calling memblock_reserve, on Xen it also
	 * means marking RW the pagetable pages that we allocated before
	 * but that haven't been used.
	 *
	 * In fact on xen we mark RO the whole range pgt_buf_start -
	 * pgt_buf_top, because we have to make sure that when
	 * init_memory_mapping reaches the pagetable pages area, it maps
	 * RO all the pagetable pages, including the ones that are beyond
	 * pgt_buf_end at that time.
	 */
	if (!after_bootmem && pgt_buf_end > pgt_buf_start)
		x86_init.mapping.pagetable_reserve(PFN_PHYS(pgt_buf_start),
				PFN_PHYS(pgt_buf_end));

	if (!after_bootmem)
		early_memtest(start, end);

	return ret >> PAGE_SHIFT;
}


/*
 * devmem_is_allowed() checks to see if /dev/mem access to a certain address
 * is valid. The argument is a physical page number.
 *
 *
 * On x86, access has to be given to the first megabyte of ram because that area
 * contains bios code and data regions used by X and dosemu and similar apps.
 * Access has to be given to non-kernel-ram areas as well, these contain the PCI
 * mmio resources as well as potential bios/acpi data regions.
 */
int devmem_is_allowed(unsigned long pagenr)
{
	if (pagenr < 256)
		return 1;
	if (iomem_is_exclusive(pagenr << PAGE_SHIFT))
		return 0;
	if (!page_is_ram(pagenr))
		return 1;
	return 0;
}

void free_init_pages(char *what, unsigned long begin, unsigned long end)
{
	unsigned long addr;
	unsigned long begin_aligned, end_aligned;

	/* Make sure boundaries are page aligned */
	begin_aligned = PAGE_ALIGN(begin);
	end_aligned   = end & PAGE_MASK;

	if (WARN_ON(begin_aligned != begin || end_aligned != end)) {
		begin = begin_aligned;
		end   = end_aligned;
	}

	if (begin >= end)
		return;

	addr = begin;

	/*
	 * If debugging page accesses then do not free this memory but
	 * mark them not present - any buggy init-section access will
	 * create a kernel page fault:
	 */
#ifdef CONFIG_DEBUG_PAGEALLOC
	printk(KERN_INFO "debug: unmapping init [mem %#010lx-%#010lx]\n",
		begin, end - 1);
	set_memory_np(begin, (end - begin) >> PAGE_SHIFT);
#else
	/*
	 * We just marked the kernel text read only above, now that
	 * we are going to free part of that, we need to make that
	 * writeable and non-executable first.
	 */
	set_memory_nx(begin, (end - begin) >> PAGE_SHIFT);
	set_memory_rw(begin, (end - begin) >> PAGE_SHIFT);

	printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10);

	for (; addr < end; addr += PAGE_SIZE) {
		ClearPageReserved(virt_to_page(addr));
		init_page_count(virt_to_page(addr));
		memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);
		free_page(addr);
		totalram_pages++;
	}
#endif
}

void free_initmem(void)
{
	free_init_pages("unused kernel memory",
			(unsigned long)(&__init_begin),
			(unsigned long)(&__init_end));
}

#ifdef CONFIG_BLK_DEV_INITRD
void __init free_initrd_mem(unsigned long start, unsigned long end)
{
	/*
	 * end could be not aligned, and We can not align that,
	 * decompresser could be confused by aligned initrd_end
	 * We already reserve the end partial page before in
	 *   - i386_start_kernel()
	 *   - x86_64_start_kernel()
	 *   - relocate_initrd()
	 * So here We can do PAGE_ALIGN() safely to get partial page to be freed
	 */
	free_init_pages("initrd memory", start, PAGE_ALIGN(end));
}
#endif

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

	memset(max_zone_pfns, 0, sizeof(max_zone_pfns));

#ifdef CONFIG_ZONE_DMA
	max_zone_pfns[ZONE_DMA]		= MAX_DMA_PFN;
#endif
#ifdef CONFIG_ZONE_DMA32
	max_zone_pfns[ZONE_DMA32]	= MAX_DMA32_PFN;
#endif
	max_zone_pfns[ZONE_NORMAL]	= max_low_pfn;
#ifdef CONFIG_HIGHMEM
	max_zone_pfns[ZONE_HIGHMEM]	= max_pfn;
#endif

	free_area_init_nodes(max_zone_pfns);
}
Commit	Line	Data
5a0e3ad6	1	#include <linux/gfp.h>
2c1b284e	2	#include <linux/initrd.h>
540aca06	3	#include <linux/ioport.h>
e5b2bb55	4	#include <linux/swap.h>
a9ce6bc1	5	#include <linux/memblock.h>
17623915	6	#include <linux/bootmem.h> /* for max_low_pfn */
540aca06	7
e5b2bb55	8	#include <asm/cacheflush.h>
f765090a	9	#include <asm/e820.h>
4fcb2083	10	#include <asm/init.h>
e5b2bb55	11	#include <asm/page.h>
540aca06	12	#include <asm/page_types.h>
e5b2bb55	13	#include <asm/sections.h>
49834396	14	#include <asm/setup.h>
f765090a	15	#include <asm/tlbflush.h>
9518e0e4	16	#include <asm/tlb.h>
76c06927	17	#include <asm/proto.h>
17623915	18	#include <asm/dma.h> /* for MAX_DMA_PFN */
9518e0e4	19
d1b19426 YL	20	unsigned long __initdata pgt_buf_start;
	21	unsigned long __meminitdata pgt_buf_end;
	22	unsigned long __meminitdata pgt_buf_top;
f765090a PE	23
	24	int after_bootmem;
	25
	26	int direct_gbpages
	27	#ifdef CONFIG_DIRECT_GBPAGES
	28	= 1
	29	#endif
	30	;
	31
722bc6b1 WC	32	struct map_range {
	33	unsigned long start;
	34	unsigned long end;
	35	unsigned page_size_mask;
	36	};
	37
	38	static void __init find_early_table_space(struct map_range *mr, unsigned long end,
	39	int use_pse, int use_gbpages)
f765090a	40	{
4b239f45	41	unsigned long puds, pmds, ptes, tables, start = 0, good_end = end;
a9ce6bc1	42	phys_addr_t base;
f765090a PE	43
	44	puds = (end + PUD_SIZE - 1) >> PUD_SHIFT;
	45	tables = roundup(puds * sizeof(pud_t), PAGE_SIZE);
	46
	47	if (use_gbpages) {
	48	unsigned long extra;
	49
	50	extra = end - ((end>>PUD_SHIFT) << PUD_SHIFT);
	51	pmds = (extra + PMD_SIZE - 1) >> PMD_SHIFT;
	52	} else
	53	pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT;
	54
	55	tables += roundup(pmds * sizeof(pmd_t), PAGE_SIZE);
	56
	57	if (use_pse) {
	58	unsigned long extra;
	59
	60	extra = end - ((end>>PMD_SHIFT) << PMD_SHIFT);
	61	#ifdef CONFIG_X86_32
	62	extra += PMD_SIZE;
	63	#endif
722bc6b1	64	/* The first 2/4M doesn't use large pages. */
bd2753b2 YL	65	if (mr->start < PMD_SIZE)
bd2753b2 YL	66	extra += mr->end - mr->start;
722bc6b1	67
f765090a PE	68	ptes = (extra + PAGE_SIZE - 1) >> PAGE_SHIFT;
	69	} else
	70	ptes = (end + PAGE_SIZE - 1) >> PAGE_SHIFT;
	71
	72	tables += roundup(ptes * sizeof(pte_t), PAGE_SIZE);
	73
	74	#ifdef CONFIG_X86_32
	75	/* for fixmap */
	76	tables += roundup(__end_of_fixed_addresses * sizeof(pte_t), PAGE_SIZE);
f765090a	77	#endif
8548c84d	78	good_end = max_pfn_mapped << PAGE_SHIFT;
1411e0ec	79
4b239f45	80	base = memblock_find_in_range(start, good_end, tables, PAGE_SIZE);
1f5026a7	81	if (!base)
f765090a PE	82	panic("Cannot find space for the kernel page tables");
f765090a PE	83
d1b19426 YL	84	pgt_buf_start = base >> PAGE_SHIFT;
	85	pgt_buf_end = pgt_buf_start;
	86	pgt_buf_top = pgt_buf_start + (tables >> PAGE_SHIFT);
f765090a	87
365811d6 BH	88	printk(KERN_DEBUG "kernel direct mapping tables up to %#lx @ [mem %#010lx-%#010lx]\n",
	89	end - 1, pgt_buf_start << PAGE_SHIFT,
	90	(pgt_buf_top << PAGE_SHIFT) - 1);
f765090a PE	91	}
f765090a PE	92
53f8023f	93	void __init native_pagetable_reserve(u64 start, u64 end)
279b706b	94	{
24aa0788	95	memblock_reserve(start, end - start);
279b706b SS	96	}
279b706b SS	97
f765090a PE	98	#ifdef CONFIG_X86_32
	99	#define NR_RANGE_MR 3
	100	#else /* CONFIG_X86_64 */
	101	#define NR_RANGE_MR 5
	102	#endif
	103
dc9dd5cc JB	104	static int __meminit save_mr(struct map_range *mr, int nr_range,
	105	unsigned long start_pfn, unsigned long end_pfn,
	106	unsigned long page_size_mask)
f765090a PE	107	{
	108	if (start_pfn < end_pfn) {
	109	if (nr_range >= NR_RANGE_MR)
	110	panic("run out of range for init_memory_mapping\n");
	111	mr[nr_range].start = start_pfn<<PAGE_SHIFT;
	112	mr[nr_range].end = end_pfn<<PAGE_SHIFT;
	113	mr[nr_range].page_size_mask = page_size_mask;
	114	nr_range++;
	115	}
	116
	117	return nr_range;
	118	}
	119
f765090a PE	120	/*
	121	* Setup the direct mapping of the physical memory at PAGE_OFFSET.
	122	* This runs before bootmem is initialized and gets pages directly from
	123	* the physical memory. To access them they are temporarily mapped.
	124	*/
	125	unsigned long __init_refok init_memory_mapping(unsigned long start,
	126	unsigned long end)
	127	{
	128	unsigned long page_size_mask = 0;
	129	unsigned long start_pfn, end_pfn;
c77a3b59	130	unsigned long ret = 0;
f765090a	131	unsigned long pos;
f765090a PE	132
	133	struct map_range mr[NR_RANGE_MR];
	134	int nr_range, i;
	135	int use_pse, use_gbpages;
	136
365811d6 BH	137	printk(KERN_INFO "init_memory_mapping: [mem %#010lx-%#010lx]\n",
365811d6 BH	138	start, end - 1);
f765090a	139
f8561296	140	#if defined(CONFIG_DEBUG_PAGEALLOC) \|\| defined(CONFIG_KMEMCHECK)
f765090a PE	141	/*
	142	* For CONFIG_DEBUG_PAGEALLOC, identity mapping will use small pages.
	143	* This will simplify cpa(), which otherwise needs to support splitting
	144	* large pages into small in interrupt context, etc.
	145	*/
	146	use_pse = use_gbpages = 0;
	147	#else
	148	use_pse = cpu_has_pse;
	149	use_gbpages = direct_gbpages;
	150	#endif
	151
f765090a PE	152	/* Enable PSE if available */
	153	if (cpu_has_pse)
	154	set_in_cr4(X86_CR4_PSE);
	155
	156	/* Enable PGE if available */
	157	if (cpu_has_pge) {
	158	set_in_cr4(X86_CR4_PGE);
	159	__supported_pte_mask \|= _PAGE_GLOBAL;
	160	}
f765090a PE	161
	162	if (use_gbpages)
	163	page_size_mask \|= 1 << PG_LEVEL_1G;
	164	if (use_pse)
	165	page_size_mask \|= 1 << PG_LEVEL_2M;
	166
	167	memset(mr, 0, sizeof(mr));
	168	nr_range = 0;
	169
	170	/* head if not big page alignment ? */
	171	start_pfn = start >> PAGE_SHIFT;
	172	pos = start_pfn << PAGE_SHIFT;
	173	#ifdef CONFIG_X86_32
	174	/*
	175	* Don't use a large page for the first 2/4MB of memory
	176	* because there are often fixed size MTRRs in there
	177	* and overlapping MTRRs into large pages can cause
	178	* slowdowns.
	179	*/
	180	if (pos == 0)
	181	end_pfn = 1<<(PMD_SHIFT - PAGE_SHIFT);
	182	else
	183	end_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT)
	184	<< (PMD_SHIFT - PAGE_SHIFT);
	185	#else /* CONFIG_X86_64 */
	186	end_pfn = ((pos + (PMD_SIZE - 1)) >> PMD_SHIFT)
	187	<< (PMD_SHIFT - PAGE_SHIFT);
	188	#endif
	189	if (end_pfn > (end >> PAGE_SHIFT))
	190	end_pfn = end >> PAGE_SHIFT;
	191	if (start_pfn < end_pfn) {
	192	nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0);
	193	pos = end_pfn << PAGE_SHIFT;
	194	}
	195
	196	/* big page (2M) range */
	197	start_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT)
	198	<< (PMD_SHIFT - PAGE_SHIFT);
	199	#ifdef CONFIG_X86_32
	200	end_pfn = (end>>PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT);
	201	#else /* CONFIG_X86_64 */
	202	end_pfn = ((pos + (PUD_SIZE - 1))>>PUD_SHIFT)
	203	<< (PUD_SHIFT - PAGE_SHIFT);
	204	if (end_pfn > ((end>>PMD_SHIFT)<<(PMD_SHIFT - PAGE_SHIFT)))
	205	end_pfn = ((end>>PMD_SHIFT)<<(PMD_SHIFT - PAGE_SHIFT));
	206	#endif
	207
	208	if (start_pfn < end_pfn) {
	209	nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
	210	page_size_mask & (1<<PG_LEVEL_2M));
	211	pos = end_pfn << PAGE_SHIFT;
	212	}
	213
	214	#ifdef CONFIG_X86_64
	215	/* big page (1G) range */
	216	start_pfn = ((pos + (PUD_SIZE - 1))>>PUD_SHIFT)
	217	<< (PUD_SHIFT - PAGE_SHIFT);
	218	end_pfn = (end >> PUD_SHIFT) << (PUD_SHIFT - PAGE_SHIFT);
	219	if (start_pfn < end_pfn) {
	220	nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
	221	page_size_mask &
	222	((1<<PG_LEVEL_2M)\|(1<<PG_LEVEL_1G)));
	223	pos = end_pfn << PAGE_SHIFT;
	224	}
225
226	/* tail is not big page (1G) alignment */
227	start_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT)
228	<< (PMD_SHIFT - PAGE_SHIFT);
229	end_pfn = (end >> PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT);
230	if (start_pfn < end_pfn) {
231	nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
232	page_size_mask & (1<<PG_LEVEL_2M));
233	pos = end_pfn << PAGE_SHIFT;
234	}
235	#endif
236
237	/* tail is not big page (2M) alignment */
238	start_pfn = pos>>PAGE_SHIFT;
239	end_pfn = end>>PAGE_SHIFT;
240	nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0);
241
242	/* try to merge same page size and continuous */
243	for (i = 0; nr_range > 1 && i < nr_range - 1; i++) {
244	unsigned long old_start;
245	if (mr[i].end != mr[i+1].start \|\|
246	mr[i].page_size_mask != mr[i+1].page_size_mask)
247	continue;
248	/* move it */
249	old_start = mr[i].start;
250	memmove(&mr[i], &mr[i+1],
251	(nr_range - 1 - i) * sizeof(struct map_range));
252	mr[i--].start = old_start;
253	nr_range--;
254	}
255
256	for (i = 0; i < nr_range; i++)
365811d6 BH	257	printk(KERN_DEBUG " [mem %#010lx-%#010lx] page %s\n",
365811d6 BH	258	mr[i].start, mr[i].end - 1,
f765090a PE	259	(mr[i].page_size_mask & (1<<PG_LEVEL_1G))?"1G":(
	260	(mr[i].page_size_mask & (1<<PG_LEVEL_2M))?"2M":"4k"));
	261
	262	/*
	263	* Find space for the kernel direct mapping tables.
	264	*
	265	* Later we should allocate these tables in the local node of the
	266	* memory mapped. Unfortunately this is done currently before the
	267	* nodes are discovered.
	268	*/
	269	if (!after_bootmem)
722bc6b1	270	find_early_table_space(&mr[0], end, use_pse, use_gbpages);
f765090a	271
f765090a PE	272	for (i = 0; i < nr_range; i++)
	273	ret = kernel_physical_mapping_init(mr[i].start, mr[i].end,
	274	mr[i].page_size_mask);
f765090a PE	275
	276	#ifdef CONFIG_X86_32
	277	early_ioremap_page_table_range_init();
	278
	279	load_cr3(swapper_pg_dir);
	280	#endif
	281
f765090a PE	282	__flush_tlb_all();
f765090a PE	283
279b706b SS	284	/*
	285	* Reserve the kernel pagetable pages we used (pgt_buf_start -
	286	* pgt_buf_end) and free the other ones (pgt_buf_end - pgt_buf_top)
	287	* so that they can be reused for other purposes.
	288	*
24aa0788 TH	289	* On native it just means calling memblock_reserve, on Xen it also
24aa0788 TH	290	* means marking RW the pagetable pages that we allocated before
279b706b SS	291	* but that haven't been used.
	292	*
	293	* In fact on xen we mark RO the whole range pgt_buf_start -
	294	* pgt_buf_top, because we have to make sure that when
	295	* init_memory_mapping reaches the pagetable pages area, it maps
	296	* RO all the pagetable pages, including the ones that are beyond
	297	* pgt_buf_end at that time.
	298	*/
d1b19426	299	if (!after_bootmem && pgt_buf_end > pgt_buf_start)
279b706b SS	300	x86_init.mapping.pagetable_reserve(PFN_PHYS(pgt_buf_start),
279b706b SS	301	PFN_PHYS(pgt_buf_end));
f765090a PE	302
	303	if (!after_bootmem)
	304	early_memtest(start, end);
	305
	306	return ret >> PAGE_SHIFT;
	307	}
	308
e5b2bb55	309
540aca06 PE	310	/*
	311	* devmem_is_allowed() checks to see if /dev/mem access to a certain address
	312	* is valid. The argument is a physical page number.
	313	*
	314	*
	315	* On x86, access has to be given to the first megabyte of ram because that area
	316	* contains bios code and data regions used by X and dosemu and similar apps.
	317	* Access has to be given to non-kernel-ram areas as well, these contain the PCI
	318	* mmio resources as well as potential bios/acpi data regions.
	319	*/
	320	int devmem_is_allowed(unsigned long pagenr)
	321	{
73e8f3d7	322	if (pagenr < 256)
540aca06 PE	323	return 1;
	324	if (iomem_is_exclusive(pagenr << PAGE_SHIFT))
	325	return 0;
	326	if (!page_is_ram(pagenr))
	327	return 1;
	328	return 0;
	329	}
	330
e5b2bb55 PE	331	void free_init_pages(char *what, unsigned long begin, unsigned long end)
e5b2bb55 PE	332	{
c967da6a YL	333	unsigned long addr;
c967da6a YL	334	unsigned long begin_aligned, end_aligned;
e5b2bb55	335
c967da6a YL	336	/* Make sure boundaries are page aligned */
	337	begin_aligned = PAGE_ALIGN(begin);
	338	end_aligned = end & PAGE_MASK;
	339
	340	if (WARN_ON(begin_aligned != begin \|\| end_aligned != end)) {
	341	begin = begin_aligned;
	342	end = end_aligned;
	343	}
	344
	345	if (begin >= end)
e5b2bb55 PE	346	return;
e5b2bb55 PE	347
c967da6a YL	348	addr = begin;
c967da6a YL	349
e5b2bb55 PE	350	/*
	351	* If debugging page accesses then do not free this memory but
	352	* mark them not present - any buggy init-section access will
	353	* create a kernel page fault:
	354	*/
	355	#ifdef CONFIG_DEBUG_PAGEALLOC
365811d6 BH	356	printk(KERN_INFO "debug: unmapping init [mem %#010lx-%#010lx]\n",
365811d6 BH	357	begin, end - 1);
e5b2bb55 PE	358	set_memory_np(begin, (end - begin) >> PAGE_SHIFT);
	359	#else
	360	/*
	361	* We just marked the kernel text read only above, now that
	362	* we are going to free part of that, we need to make that
5bd5a452	363	* writeable and non-executable first.
e5b2bb55	364	*/
5bd5a452	365	set_memory_nx(begin, (end - begin) >> PAGE_SHIFT);
e5b2bb55 PE	366	set_memory_rw(begin, (end - begin) >> PAGE_SHIFT);
	367
	368	printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10);
	369
	370	for (; addr < end; addr += PAGE_SIZE) {
	371	ClearPageReserved(virt_to_page(addr));
	372	init_page_count(virt_to_page(addr));
c967da6a	373	memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);
e5b2bb55 PE	374	free_page(addr);
	375	totalram_pages++;
	376	}
	377	#endif
	378	}
	379
	380	void free_initmem(void)
	381	{
	382	free_init_pages("unused kernel memory",
	383	(unsigned long)(&__init_begin),
	384	(unsigned long)(&__init_end));
	385	}
731ddea6 PE	386
731ddea6 PE	387	#ifdef CONFIG_BLK_DEV_INITRD
0d26d1d8	388	void __init free_initrd_mem(unsigned long start, unsigned long end)
731ddea6	389	{
c967da6a YL	390	/*
	391	* end could be not aligned, and We can not align that,
	392	* decompresser could be confused by aligned initrd_end
	393	* We already reserve the end partial page before in
	394	* - i386_start_kernel()
	395	* - x86_64_start_kernel()
	396	* - relocate_initrd()
	397	* So here We can do PAGE_ALIGN() safely to get partial page to be freed
	398	*/
	399	free_init_pages("initrd memory", start, PAGE_ALIGN(end));
731ddea6 PE	400	}
731ddea6 PE	401	#endif
17623915 PE	402
	403	void __init zone_sizes_init(void)
	404	{
	405	unsigned long max_zone_pfns[MAX_NR_ZONES];
	406
	407	memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
	408
	409	#ifdef CONFIG_ZONE_DMA
	410	max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN;
	411	#endif
	412	#ifdef CONFIG_ZONE_DMA32
	413	max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
	414	#endif
	415	max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
	416	#ifdef CONFIG_HIGHMEM
	417	max_zone_pfns[ZONE_HIGHMEM] = max_pfn;
	418	#endif
	419
	420	free_area_init_nodes(max_zone_pfns);
	421	}
	422