[mirror_ubuntu-bionic-kernel.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 <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 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
;

static void __init find_early_table_space(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
		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);

	good_end = max_pfn_mapped << PAGE_SHIFT;
#endif

	base = memblock_find_in_range(start, good_end, tables, PAGE_SIZE);
	if (base == MEMBLOCK_ERROR)
		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 @ %lx-%lx\n",
		end, pgt_buf_start << PAGE_SHIFT, pgt_buf_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

	__flush_tlb_all();

	if (!after_bootmem && pgt_buf_end > pgt_buf_start)
		memblock_x86_reserve_range(pgt_buf_start << PAGE_SHIFT,
				 pgt_buf_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;
	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 memory %08lx..%08lx\n",
		begin, 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 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 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
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>
540aca06	6
e5b2bb55	7	#include <asm/cacheflush.h>
f765090a	8	#include <asm/e820.h>
4fcb2083	9	#include <asm/init.h>
e5b2bb55	10	#include <asm/page.h>
540aca06	11	#include <asm/page_types.h>
e5b2bb55	12	#include <asm/sections.h>
49834396	13	#include <asm/setup.h>
e5b2bb55	14	#include <asm/system.h>
f765090a	15	#include <asm/tlbflush.h>
9518e0e4	16	#include <asm/tlb.h>
76c06927	17	#include <asm/proto.h>
9518e0e4 PE	18
9518e0e4 PE	19	DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
f765090a	20
d1b19426 YL	21	unsigned long __initdata pgt_buf_start;
	22	unsigned long __meminitdata pgt_buf_end;
	23	unsigned long __meminitdata pgt_buf_top;
f765090a PE	24
	25	int after_bootmem;
	26
	27	int direct_gbpages
	28	#ifdef CONFIG_DIRECT_GBPAGES
	29	= 1
	30	#endif
	31	;
	32
	33	static void __init find_early_table_space(unsigned long end, int use_pse,
	34	int use_gbpages)
	35	{
4b239f45	36	unsigned long puds, pmds, ptes, tables, start = 0, good_end = end;
a9ce6bc1	37	phys_addr_t base;
f765090a PE	38
	39	puds = (end + PUD_SIZE - 1) >> PUD_SHIFT;
	40	tables = roundup(puds * sizeof(pud_t), PAGE_SIZE);
	41
	42	if (use_gbpages) {
	43	unsigned long extra;
	44
	45	extra = end - ((end>>PUD_SHIFT) << PUD_SHIFT);
	46	pmds = (extra + PMD_SIZE - 1) >> PMD_SHIFT;
	47	} else
	48	pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT;
	49
	50	tables += roundup(pmds * sizeof(pmd_t), PAGE_SIZE);
	51
	52	if (use_pse) {
	53	unsigned long extra;
	54
	55	extra = end - ((end>>PMD_SHIFT) << PMD_SHIFT);
	56	#ifdef CONFIG_X86_32
	57	extra += PMD_SIZE;
	58	#endif
	59	ptes = (extra + PAGE_SIZE - 1) >> PAGE_SHIFT;
	60	} else
	61	ptes = (end + PAGE_SIZE - 1) >> PAGE_SHIFT;
	62
	63	tables += roundup(ptes * sizeof(pte_t), PAGE_SIZE);
	64
	65	#ifdef CONFIG_X86_32
	66	/* for fixmap */
	67	tables += roundup(__end_of_fixed_addresses * sizeof(pte_t), PAGE_SIZE);
f765090a	68
4b239f45	69	good_end = max_pfn_mapped << PAGE_SHIFT;
f765090a	70	#endif
1411e0ec	71
4b239f45	72	base = memblock_find_in_range(start, good_end, tables, PAGE_SIZE);
a9ce6bc1	73	if (base == MEMBLOCK_ERROR)
f765090a PE	74	panic("Cannot find space for the kernel page tables");
f765090a PE	75
d1b19426 YL	76	pgt_buf_start = base >> PAGE_SHIFT;
	77	pgt_buf_end = pgt_buf_start;
	78	pgt_buf_top = pgt_buf_start + (tables >> PAGE_SHIFT);
f765090a PE	79
f765090a PE	80	printk(KERN_DEBUG "kernel direct mapping tables up to %lx @ %lx-%lx\n",
d1b19426	81	end, pgt_buf_start << PAGE_SHIFT, pgt_buf_top << PAGE_SHIFT);
f765090a PE	82	}
	83
	84	struct map_range {
	85	unsigned long start;
	86	unsigned long end;
	87	unsigned page_size_mask;
	88	};
	89
	90	#ifdef CONFIG_X86_32
	91	#define NR_RANGE_MR 3
	92	#else /* CONFIG_X86_64 */
	93	#define NR_RANGE_MR 5
	94	#endif
	95
dc9dd5cc JB	96	static int __meminit save_mr(struct map_range *mr, int nr_range,
	97	unsigned long start_pfn, unsigned long end_pfn,
	98	unsigned long page_size_mask)
f765090a PE	99	{
	100	if (start_pfn < end_pfn) {
	101	if (nr_range >= NR_RANGE_MR)
	102	panic("run out of range for init_memory_mapping\n");
	103	mr[nr_range].start = start_pfn<<PAGE_SHIFT;
	104	mr[nr_range].end = end_pfn<<PAGE_SHIFT;
	105	mr[nr_range].page_size_mask = page_size_mask;
	106	nr_range++;
	107	}
	108
	109	return nr_range;
	110	}
	111
f765090a PE	112	/*
	113	* Setup the direct mapping of the physical memory at PAGE_OFFSET.
	114	* This runs before bootmem is initialized and gets pages directly from
	115	* the physical memory. To access them they are temporarily mapped.
	116	*/
	117	unsigned long __init_refok init_memory_mapping(unsigned long start,
	118	unsigned long end)
	119	{
	120	unsigned long page_size_mask = 0;
	121	unsigned long start_pfn, end_pfn;
c77a3b59	122	unsigned long ret = 0;
f765090a	123	unsigned long pos;
f765090a PE	124
	125	struct map_range mr[NR_RANGE_MR];
	126	int nr_range, i;
	127	int use_pse, use_gbpages;
	128
	129	printk(KERN_INFO "init_memory_mapping: %016lx-%016lx\n", start, end);
	130
f8561296	131	#if defined(CONFIG_DEBUG_PAGEALLOC) \|\| defined(CONFIG_KMEMCHECK)
f765090a PE	132	/*
	133	* For CONFIG_DEBUG_PAGEALLOC, identity mapping will use small pages.
	134	* This will simplify cpa(), which otherwise needs to support splitting
	135	* large pages into small in interrupt context, etc.
	136	*/
	137	use_pse = use_gbpages = 0;
	138	#else
	139	use_pse = cpu_has_pse;
	140	use_gbpages = direct_gbpages;
	141	#endif
	142
f765090a PE	143	/* Enable PSE if available */
	144	if (cpu_has_pse)
	145	set_in_cr4(X86_CR4_PSE);
	146
	147	/* Enable PGE if available */
	148	if (cpu_has_pge) {
	149	set_in_cr4(X86_CR4_PGE);
	150	__supported_pte_mask \|= _PAGE_GLOBAL;
	151	}
f765090a PE	152
	153	if (use_gbpages)
	154	page_size_mask \|= 1 << PG_LEVEL_1G;
	155	if (use_pse)
	156	page_size_mask \|= 1 << PG_LEVEL_2M;
	157
	158	memset(mr, 0, sizeof(mr));
	159	nr_range = 0;
	160
	161	/* head if not big page alignment ? */
	162	start_pfn = start >> PAGE_SHIFT;
	163	pos = start_pfn << PAGE_SHIFT;
	164	#ifdef CONFIG_X86_32
	165	/*
	166	* Don't use a large page for the first 2/4MB of memory
	167	* because there are often fixed size MTRRs in there
	168	* and overlapping MTRRs into large pages can cause
	169	* slowdowns.
	170	*/
	171	if (pos == 0)
	172	end_pfn = 1<<(PMD_SHIFT - PAGE_SHIFT);
	173	else
	174	end_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT)
	175	<< (PMD_SHIFT - PAGE_SHIFT);
	176	#else /* CONFIG_X86_64 */
	177	end_pfn = ((pos + (PMD_SIZE - 1)) >> PMD_SHIFT)
	178	<< (PMD_SHIFT - PAGE_SHIFT);
	179	#endif
	180	if (end_pfn > (end >> PAGE_SHIFT))
	181	end_pfn = end >> PAGE_SHIFT;
	182	if (start_pfn < end_pfn) {
	183	nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0);
	184	pos = end_pfn << PAGE_SHIFT;
	185	}
	186
	187	/* big page (2M) range */
	188	start_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT)
	189	<< (PMD_SHIFT - PAGE_SHIFT);
	190	#ifdef CONFIG_X86_32
	191	end_pfn = (end>>PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT);
	192	#else /* CONFIG_X86_64 */
	193	end_pfn = ((pos + (PUD_SIZE - 1))>>PUD_SHIFT)
	194	<< (PUD_SHIFT - PAGE_SHIFT);
	195	if (end_pfn > ((end>>PMD_SHIFT)<<(PMD_SHIFT - PAGE_SHIFT)))
	196	end_pfn = ((end>>PMD_SHIFT)<<(PMD_SHIFT - PAGE_SHIFT));
	197	#endif
	198
	199	if (start_pfn < end_pfn) {
	200	nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
	201	page_size_mask & (1<<PG_LEVEL_2M));
	202	pos = end_pfn << PAGE_SHIFT;
	203	}
	204
	205	#ifdef CONFIG_X86_64
	206	/* big page (1G) range */
	207	start_pfn = ((pos + (PUD_SIZE - 1))>>PUD_SHIFT)
	208	<< (PUD_SHIFT - PAGE_SHIFT);
	209	end_pfn = (end >> PUD_SHIFT) << (PUD_SHIFT - PAGE_SHIFT);
	210	if (start_pfn < end_pfn) {
	211	nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
	212	page_size_mask &
	213	((1<<PG_LEVEL_2M)\|(1<<PG_LEVEL_1G)));
	214	pos = end_pfn << PAGE_SHIFT;
	215	}
216
217	/* tail is not big page (1G) alignment */
218	start_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT)
219	<< (PMD_SHIFT - PAGE_SHIFT);
220	end_pfn = (end >> PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT);
221	if (start_pfn < end_pfn) {
222	nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
223	page_size_mask & (1<<PG_LEVEL_2M));
224	pos = end_pfn << PAGE_SHIFT;
225	}
226	#endif
227
228	/* tail is not big page (2M) alignment */
229	start_pfn = pos>>PAGE_SHIFT;
230	end_pfn = end>>PAGE_SHIFT;
231	nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0);
232
233	/* try to merge same page size and continuous */
234	for (i = 0; nr_range > 1 && i < nr_range - 1; i++) {
235	unsigned long old_start;
236	if (mr[i].end != mr[i+1].start \|\|
237	mr[i].page_size_mask != mr[i+1].page_size_mask)
238	continue;
239	/* move it */
240	old_start = mr[i].start;
241	memmove(&mr[i], &mr[i+1],
242	(nr_range - 1 - i) * sizeof(struct map_range));
243	mr[i--].start = old_start;
244	nr_range--;
245	}
246
247	for (i = 0; i < nr_range; i++)
248	printk(KERN_DEBUG " %010lx - %010lx page %s\n",
249	mr[i].start, mr[i].end,
250	(mr[i].page_size_mask & (1<<PG_LEVEL_1G))?"1G":(
251	(mr[i].page_size_mask & (1<<PG_LEVEL_2M))?"2M":"4k"));
252
253	/*
254	* Find space for the kernel direct mapping tables.
255	*
256	* Later we should allocate these tables in the local node of the
257	* memory mapped. Unfortunately this is done currently before the
258	* nodes are discovered.
259	*/
260	if (!after_bootmem)
261	find_early_table_space(end, use_pse, use_gbpages);
262
f765090a PE	263	for (i = 0; i < nr_range; i++)
	264	ret = kernel_physical_mapping_init(mr[i].start, mr[i].end,
	265	mr[i].page_size_mask);
f765090a PE	266
	267	#ifdef CONFIG_X86_32
	268	early_ioremap_page_table_range_init();
	269
	270	load_cr3(swapper_pg_dir);
	271	#endif
	272
f765090a PE	273	__flush_tlb_all();
f765090a PE	274
d1b19426 YL	275	if (!after_bootmem && pgt_buf_end > pgt_buf_start)
	276	memblock_x86_reserve_range(pgt_buf_start << PAGE_SHIFT,
	277	pgt_buf_end << PAGE_SHIFT, "PGTABLE");
f765090a PE	278
	279	if (!after_bootmem)
	280	early_memtest(start, end);
	281
	282	return ret >> PAGE_SHIFT;
	283	}
	284
e5b2bb55	285
540aca06 PE	286	/*
	287	* devmem_is_allowed() checks to see if /dev/mem access to a certain address
	288	* is valid. The argument is a physical page number.
	289	*
	290	*
	291	* On x86, access has to be given to the first megabyte of ram because that area
	292	* contains bios code and data regions used by X and dosemu and similar apps.
	293	* Access has to be given to non-kernel-ram areas as well, these contain the PCI
	294	* mmio resources as well as potential bios/acpi data regions.
	295	*/
	296	int devmem_is_allowed(unsigned long pagenr)
	297	{
	298	if (pagenr <= 256)
	299	return 1;
	300	if (iomem_is_exclusive(pagenr << PAGE_SHIFT))
	301	return 0;
	302	if (!page_is_ram(pagenr))
	303	return 1;
	304	return 0;
	305	}
	306
e5b2bb55 PE	307	void free_init_pages(char *what, unsigned long begin, unsigned long end)
e5b2bb55 PE	308	{
c967da6a YL	309	unsigned long addr;
c967da6a YL	310	unsigned long begin_aligned, end_aligned;
e5b2bb55	311
c967da6a YL	312	/* Make sure boundaries are page aligned */
	313	begin_aligned = PAGE_ALIGN(begin);
	314	end_aligned = end & PAGE_MASK;
	315
	316	if (WARN_ON(begin_aligned != begin \|\| end_aligned != end)) {
	317	begin = begin_aligned;
	318	end = end_aligned;
	319	}
	320
	321	if (begin >= end)
e5b2bb55 PE	322	return;
e5b2bb55 PE	323
c967da6a YL	324	addr = begin;
c967da6a YL	325
e5b2bb55 PE	326	/*
	327	* If debugging page accesses then do not free this memory but
	328	* mark them not present - any buggy init-section access will
	329	* create a kernel page fault:
	330	*/
	331	#ifdef CONFIG_DEBUG_PAGEALLOC
	332	printk(KERN_INFO "debug: unmapping init memory %08lx..%08lx\n",
c967da6a	333	begin, end);
e5b2bb55 PE	334	set_memory_np(begin, (end - begin) >> PAGE_SHIFT);
	335	#else
	336	/*
	337	* We just marked the kernel text read only above, now that
	338	* we are going to free part of that, we need to make that
5bd5a452	339	* writeable and non-executable first.
e5b2bb55	340	*/
5bd5a452	341	set_memory_nx(begin, (end - begin) >> PAGE_SHIFT);
e5b2bb55 PE	342	set_memory_rw(begin, (end - begin) >> PAGE_SHIFT);
	343
	344	printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10);
	345
	346	for (; addr < end; addr += PAGE_SIZE) {
	347	ClearPageReserved(virt_to_page(addr));
	348	init_page_count(virt_to_page(addr));
c967da6a	349	memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);
e5b2bb55 PE	350	free_page(addr);
	351	totalram_pages++;
	352	}
	353	#endif
	354	}
	355
	356	void free_initmem(void)
	357	{
	358	free_init_pages("unused kernel memory",
	359	(unsigned long)(&__init_begin),
	360	(unsigned long)(&__init_end));
	361	}
731ddea6 PE	362
	363	#ifdef CONFIG_BLK_DEV_INITRD
	364	void free_initrd_mem(unsigned long start, unsigned long end)
	365	{
c967da6a YL	366	/*
	367	* end could be not aligned, and We can not align that,
	368	* decompresser could be confused by aligned initrd_end
	369	* We already reserve the end partial page before in
	370	* - i386_start_kernel()
	371	* - x86_64_start_kernel()
	372	* - relocate_initrd()
	373	* So here We can do PAGE_ALIGN() safely to get partial page to be freed
	374	*/
	375	free_init_pages("initrd memory", start, PAGE_ALIGN(end));
731ddea6 PE	376	}
731ddea6 PE	377	#endif