[linux-2.6-block.git] / arch / x86 / mm / init.c

#include <linux/gfp.h>
#include <linux/initrd.h>
#include <linux/ioport.h>
#include <linux/swap.h>

#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/system.h>
#include <asm/tlbflush.h>
#include <asm/tlb.h>
#include <asm/proto.h>

DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);

unsigned long __initdata e820_table_start;
unsigned long __meminitdata e820_table_end;
unsigned long __meminitdata e820_table_top;

int after_bootmem;

int direct_gbpages
#ifdef CONFIG_DIRECT_GBPAGES
				= 1
#endif
;

static void __init find_early_table_space(unsigned long end, int use_pse,
					  int use_gbpages)
{
	unsigned long puds, pmds, ptes, tables, start;

	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
		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

	/*
	 * RED-PEN putting page tables only on node 0 could
	 * cause a hotspot and fill up ZONE_DMA. The page tables
	 * need roughly 0.5KB per GB.
	 */
#ifdef CONFIG_X86_32
	start = 0x7000;
#else
	start = 0x8000;
#endif
	e820_table_start = find_e820_area(start, max_pfn_mapped<<PAGE_SHIFT,
					tables, PAGE_SIZE);
	if (e820_table_start == -1UL)
		panic("Cannot find space for the kernel page tables");

	e820_table_start >>= PAGE_SHIFT;
	e820_table_end = e820_table_start;
	e820_table_top = e820_table_start + (tables >> PAGE_SHIFT);

	printk(KERN_DEBUG "kernel direct mapping tables up to %lx @ %lx-%lx\n",
		end, e820_table_start << PAGE_SHIFT, e820_table_top << PAGE_SHIFT);
}

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

#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: %016lx-%016lx\n", start, end);

#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 " %010lx - %010lx page %s\n",
				mr[i].start, mr[i].end,
			(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(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

#ifdef CONFIG_X86_64
	if (!after_bootmem && !start) {
		pud_t *pud;
		pmd_t *pmd;

		mmu_cr4_features = read_cr4();

		/*
		 * _brk_end cannot change anymore, but it and _end may be
		 * located on different 2M pages. cleanup_highmap(), however,
		 * can only consider _end when it runs, so destroy any
		 * mappings beyond _brk_end here.
		 */
		pud = pud_offset(pgd_offset_k(_brk_end), _brk_end);
		pmd = pmd_offset(pud, _brk_end - 1);
		while (++pmd <= pmd_offset(pud, (unsigned long)_end - 1))
			pmd_clear(pmd);
	}
#endif
	__flush_tlb_all();

	if (!after_bootmem && e820_table_end > e820_table_start)
		reserve_early(e820_table_start << PAGE_SHIFT,
				 e820_table_end << PAGE_SHIFT, "PGTABLE");

	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 = begin;

	if (addr >= end)
		return;

	/*
	 * 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 memory %08lx..%08lx\n",
		begin, PAGE_ALIGN(end));
	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 first.
	 */
	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 & ~(PAGE_SIZE-1)),
			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 free_initrd_mem(unsigned long start, unsigned long end)
{
	free_init_pages("initrd memory", start, end);
}
#endif
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>
540aca06	5
e5b2bb55	6	#include <asm/cacheflush.h>
f765090a	7	#include <asm/e820.h>
4fcb2083	8	#include <asm/init.h>
e5b2bb55	9	#include <asm/page.h>
540aca06	10	#include <asm/page_types.h>
e5b2bb55	11	#include <asm/sections.h>
49834396	12	#include <asm/setup.h>
e5b2bb55	13	#include <asm/system.h>
f765090a	14	#include <asm/tlbflush.h>
9518e0e4	15	#include <asm/tlb.h>
76c06927	16	#include <asm/proto.h>
9518e0e4 PE	17
9518e0e4 PE	18	DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
f765090a	19
298af9d8 PE	20	unsigned long __initdata e820_table_start;
	21	unsigned long __meminitdata e820_table_end;
	22	unsigned long __meminitdata e820_table_top;
f765090a PE	23
	24	int after_bootmem;
	25
	26	int direct_gbpages
	27	#ifdef CONFIG_DIRECT_GBPAGES
	28	= 1
	29	#endif
	30	;
	31
	32	static void __init find_early_table_space(unsigned long end, int use_pse,
	33	int use_gbpages)
	34	{
	35	unsigned long puds, pmds, ptes, tables, start;
	36
	37	puds = (end + PUD_SIZE - 1) >> PUD_SHIFT;
	38	tables = roundup(puds * sizeof(pud_t), PAGE_SIZE);
	39
	40	if (use_gbpages) {
	41	unsigned long extra;
	42
	43	extra = end - ((end>>PUD_SHIFT) << PUD_SHIFT);
	44	pmds = (extra + PMD_SIZE - 1) >> PMD_SHIFT;
	45	} else
	46	pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT;
	47
	48	tables += roundup(pmds * sizeof(pmd_t), PAGE_SIZE);
	49
	50	if (use_pse) {
	51	unsigned long extra;
	52
	53	extra = end - ((end>>PMD_SHIFT) << PMD_SHIFT);
	54	#ifdef CONFIG_X86_32
	55	extra += PMD_SIZE;
	56	#endif
	57	ptes = (extra + PAGE_SIZE - 1) >> PAGE_SHIFT;
	58	} else
	59	ptes = (end + PAGE_SIZE - 1) >> PAGE_SHIFT;
	60
	61	tables += roundup(ptes * sizeof(pte_t), PAGE_SIZE);
	62
	63	#ifdef CONFIG_X86_32
	64	/* for fixmap */
	65	tables += roundup(__end_of_fixed_addresses * sizeof(pte_t), PAGE_SIZE);
	66	#endif
	67
	68	/*
	69	* RED-PEN putting page tables only on node 0 could
	70	* cause a hotspot and fill up ZONE_DMA. The page tables
	71	* need roughly 0.5KB per GB.
	72	*/
	73	#ifdef CONFIG_X86_32
	74	start = 0x7000;
80989ce0	75	#else
f765090a	76	start = 0x8000;
f765090a	77	#endif
80989ce0 YL	78	e820_table_start = find_e820_area(start, max_pfn_mapped<<PAGE_SHIFT,
80989ce0 YL	79	tables, PAGE_SIZE);
298af9d8	80	if (e820_table_start == -1UL)
f765090a PE	81	panic("Cannot find space for the kernel page tables");
f765090a PE	82
298af9d8 PE	83	e820_table_start >>= PAGE_SHIFT;
	84	e820_table_end = e820_table_start;
	85	e820_table_top = e820_table_start + (tables >> PAGE_SHIFT);
f765090a PE	86
f765090a PE	87	printk(KERN_DEBUG "kernel direct mapping tables up to %lx @ %lx-%lx\n",
298af9d8	88	end, e820_table_start << PAGE_SHIFT, e820_table_top << PAGE_SHIFT);
f765090a PE	89	}
	90
	91	struct map_range {
	92	unsigned long start;
	93	unsigned long end;
	94	unsigned page_size_mask;
	95	};
	96
	97	#ifdef CONFIG_X86_32
	98	#define NR_RANGE_MR 3
	99	#else /* CONFIG_X86_64 */
	100	#define NR_RANGE_MR 5
	101	#endif
	102
dc9dd5cc JB	103	static int __meminit save_mr(struct map_range *mr, int nr_range,
	104	unsigned long start_pfn, unsigned long end_pfn,
	105	unsigned long page_size_mask)
f765090a PE	106	{
	107	if (start_pfn < end_pfn) {
	108	if (nr_range >= NR_RANGE_MR)
	109	panic("run out of range for init_memory_mapping\n");
	110	mr[nr_range].start = start_pfn<<PAGE_SHIFT;
	111	mr[nr_range].end = end_pfn<<PAGE_SHIFT;
	112	mr[nr_range].page_size_mask = page_size_mask;
	113	nr_range++;
	114	}
	115
	116	return nr_range;
	117	}
	118
f765090a PE	119	/*
	120	* Setup the direct mapping of the physical memory at PAGE_OFFSET.
	121	* This runs before bootmem is initialized and gets pages directly from
	122	* the physical memory. To access them they are temporarily mapped.
	123	*/
	124	unsigned long __init_refok init_memory_mapping(unsigned long start,
	125	unsigned long end)
	126	{
	127	unsigned long page_size_mask = 0;
	128	unsigned long start_pfn, end_pfn;
c77a3b59	129	unsigned long ret = 0;
f765090a	130	unsigned long pos;
f765090a PE	131
	132	struct map_range mr[NR_RANGE_MR];
	133	int nr_range, i;
	134	int use_pse, use_gbpages;
	135
	136	printk(KERN_INFO "init_memory_mapping: %016lx-%016lx\n", start, end);
	137
f8561296	138	#if defined(CONFIG_DEBUG_PAGEALLOC) \|\| defined(CONFIG_KMEMCHECK)
f765090a PE	139	/*
	140	* For CONFIG_DEBUG_PAGEALLOC, identity mapping will use small pages.
	141	* This will simplify cpa(), which otherwise needs to support splitting
	142	* large pages into small in interrupt context, etc.
	143	*/
	144	use_pse = use_gbpages = 0;
	145	#else
	146	use_pse = cpu_has_pse;
	147	use_gbpages = direct_gbpages;
	148	#endif
	149
f765090a PE	150	/* Enable PSE if available */
	151	if (cpu_has_pse)
	152	set_in_cr4(X86_CR4_PSE);
	153
	154	/* Enable PGE if available */
	155	if (cpu_has_pge) {
	156	set_in_cr4(X86_CR4_PGE);
	157	__supported_pte_mask \|= _PAGE_GLOBAL;
	158	}
f765090a PE	159
	160	if (use_gbpages)
	161	page_size_mask \|= 1 << PG_LEVEL_1G;
	162	if (use_pse)
	163	page_size_mask \|= 1 << PG_LEVEL_2M;
	164
	165	memset(mr, 0, sizeof(mr));
	166	nr_range = 0;
	167
	168	/* head if not big page alignment ? */
	169	start_pfn = start >> PAGE_SHIFT;
	170	pos = start_pfn << PAGE_SHIFT;
	171	#ifdef CONFIG_X86_32
	172	/*
	173	* Don't use a large page for the first 2/4MB of memory
	174	* because there are often fixed size MTRRs in there
	175	* and overlapping MTRRs into large pages can cause
	176	* slowdowns.
	177	*/
	178	if (pos == 0)
	179	end_pfn = 1<<(PMD_SHIFT - PAGE_SHIFT);
	180	else
	181	end_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT)
	182	<< (PMD_SHIFT - PAGE_SHIFT);
	183	#else /* CONFIG_X86_64 */
	184	end_pfn = ((pos + (PMD_SIZE - 1)) >> PMD_SHIFT)
	185	<< (PMD_SHIFT - PAGE_SHIFT);
	186	#endif
	187	if (end_pfn > (end >> PAGE_SHIFT))
	188	end_pfn = end >> PAGE_SHIFT;
	189	if (start_pfn < end_pfn) {
	190	nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0);
	191	pos = end_pfn << PAGE_SHIFT;
	192	}
	193
	194	/* big page (2M) range */
	195	start_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT)
	196	<< (PMD_SHIFT - PAGE_SHIFT);
	197	#ifdef CONFIG_X86_32
	198	end_pfn = (end>>PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT);
	199	#else /* CONFIG_X86_64 */
	200	end_pfn = ((pos + (PUD_SIZE - 1))>>PUD_SHIFT)
	201	<< (PUD_SHIFT - PAGE_SHIFT);
	202	if (end_pfn > ((end>>PMD_SHIFT)<<(PMD_SHIFT - PAGE_SHIFT)))
	203	end_pfn = ((end>>PMD_SHIFT)<<(PMD_SHIFT - PAGE_SHIFT));
	204	#endif
	205
	206	if (start_pfn < end_pfn) {
	207	nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
	208	page_size_mask & (1<<PG_LEVEL_2M));
	209	pos = end_pfn << PAGE_SHIFT;
	210	}
	211
	212	#ifdef CONFIG_X86_64
	213	/* big page (1G) range */
	214	start_pfn = ((pos + (PUD_SIZE - 1))>>PUD_SHIFT)
	215	<< (PUD_SHIFT - PAGE_SHIFT);
	216	end_pfn = (end >> PUD_SHIFT) << (PUD_SHIFT - PAGE_SHIFT);
	217	if (start_pfn < end_pfn) {
	218	nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
	219	page_size_mask &
	220	((1<<PG_LEVEL_2M)\|(1<<PG_LEVEL_1G)));
	221	pos = end_pfn << PAGE_SHIFT;
	222	}
223
224	/* tail is not big page (1G) alignment */
225	start_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT)
226	<< (PMD_SHIFT - PAGE_SHIFT);
227	end_pfn = (end >> PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT);
228	if (start_pfn < end_pfn) {
229	nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
230	page_size_mask & (1<<PG_LEVEL_2M));
231	pos = end_pfn << PAGE_SHIFT;
232	}
233	#endif
234
235	/* tail is not big page (2M) alignment */
236	start_pfn = pos>>PAGE_SHIFT;
237	end_pfn = end>>PAGE_SHIFT;
238	nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0);
239
240	/* try to merge same page size and continuous */
241	for (i = 0; nr_range > 1 && i < nr_range - 1; i++) {
242	unsigned long old_start;
243	if (mr[i].end != mr[i+1].start \|\|
244	mr[i].page_size_mask != mr[i+1].page_size_mask)
245	continue;
246	/* move it */
247	old_start = mr[i].start;
248	memmove(&mr[i], &mr[i+1],
249	(nr_range - 1 - i) * sizeof(struct map_range));
250	mr[i--].start = old_start;
251	nr_range--;
252	}
253
254	for (i = 0; i < nr_range; i++)
255	printk(KERN_DEBUG " %010lx - %010lx page %s\n",
256	mr[i].start, mr[i].end,
257	(mr[i].page_size_mask & (1<<PG_LEVEL_1G))?"1G":(
258	(mr[i].page_size_mask & (1<<PG_LEVEL_2M))?"2M":"4k"));
259
260	/*
261	* Find space for the kernel direct mapping tables.
262	*
263	* Later we should allocate these tables in the local node of the
264	* memory mapped. Unfortunately this is done currently before the
265	* nodes are discovered.
266	*/
267	if (!after_bootmem)
268	find_early_table_space(end, use_pse, use_gbpages);
269
f765090a PE	270	for (i = 0; i < nr_range; i++)
	271	ret = kernel_physical_mapping_init(mr[i].start, mr[i].end,
	272	mr[i].page_size_mask);
f765090a PE	273
	274	#ifdef CONFIG_X86_32
	275	early_ioremap_page_table_range_init();
	276
	277	load_cr3(swapper_pg_dir);
	278	#endif
	279
	280	#ifdef CONFIG_X86_64
49834396 JB	281	if (!after_bootmem && !start) {
	282	pud_t *pud;
	283	pmd_t *pmd;
	284
f765090a	285	mmu_cr4_features = read_cr4();
49834396 JB	286
	287	/*
	288	* _brk_end cannot change anymore, but it and _end may be
	289	* located on different 2M pages. cleanup_highmap(), however,
	290	* can only consider _end when it runs, so destroy any
	291	* mappings beyond _brk_end here.
	292	*/
	293	pud = pud_offset(pgd_offset_k(_brk_end), _brk_end);
	294	pmd = pmd_offset(pud, _brk_end - 1);
	295	while (++pmd <= pmd_offset(pud, (unsigned long)_end - 1))
	296	pmd_clear(pmd);
	297	}
f765090a PE	298	#endif
	299	__flush_tlb_all();
	300
298af9d8 PE	301	if (!after_bootmem && e820_table_end > e820_table_start)
	302	reserve_early(e820_table_start << PAGE_SHIFT,
	303	e820_table_end << PAGE_SHIFT, "PGTABLE");
f765090a PE	304
	305	if (!after_bootmem)
	306	early_memtest(start, end);
	307
	308	return ret >> PAGE_SHIFT;
	309	}
	310
e5b2bb55	311
540aca06 PE	312	/*
	313	* devmem_is_allowed() checks to see if /dev/mem access to a certain address
	314	* is valid. The argument is a physical page number.
	315	*
	316	*
	317	* On x86, access has to be given to the first megabyte of ram because that area
	318	* contains bios code and data regions used by X and dosemu and similar apps.
	319	* Access has to be given to non-kernel-ram areas as well, these contain the PCI
	320	* mmio resources as well as potential bios/acpi data regions.
	321	*/
	322	int devmem_is_allowed(unsigned long pagenr)
	323	{
	324	if (pagenr <= 256)
	325	return 1;
	326	if (iomem_is_exclusive(pagenr << PAGE_SHIFT))
	327	return 0;
	328	if (!page_is_ram(pagenr))
	329	return 1;
	330	return 0;
	331	}
	332
e5b2bb55 PE	333	void free_init_pages(char *what, unsigned long begin, unsigned long end)
	334	{
	335	unsigned long addr = begin;
	336
	337	if (addr >= end)
	338	return;
	339
	340	/*
	341	* If debugging page accesses then do not free this memory but
	342	* mark them not present - any buggy init-section access will
	343	* create a kernel page fault:
	344	*/
	345	#ifdef CONFIG_DEBUG_PAGEALLOC
	346	printk(KERN_INFO "debug: unmapping init memory %08lx..%08lx\n",
	347	begin, PAGE_ALIGN(end));
	348	set_memory_np(begin, (end - begin) >> PAGE_SHIFT);
	349	#else
	350	/*
	351	* We just marked the kernel text read only above, now that
	352	* we are going to free part of that, we need to make that
	353	* writeable first.
	354	*/
	355	set_memory_rw(begin, (end - begin) >> PAGE_SHIFT);
	356
	357	printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10);
	358
	359	for (; addr < end; addr += PAGE_SIZE) {
	360	ClearPageReserved(virt_to_page(addr));
	361	init_page_count(virt_to_page(addr));
	362	memset((void *)(addr & ~(PAGE_SIZE-1)),
	363	POISON_FREE_INITMEM, PAGE_SIZE);
	364	free_page(addr);
	365	totalram_pages++;
	366	}
	367	#endif
	368	}
	369
	370	void free_initmem(void)
	371	{
	372	free_init_pages("unused kernel memory",
	373	(unsigned long)(&__init_begin),
	374	(unsigned long)(&__init_end));
	375	}
731ddea6 PE	376
	377	#ifdef CONFIG_BLK_DEV_INITRD
	378	void free_initrd_mem(unsigned long start, unsigned long end)
	379	{
	380	free_init_pages("initrd memory", start, end);
	381	}
	382	#endif