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Commit f765090a authored by Pekka Enberg's avatar Pekka Enberg Committed by Ingo Molnar
Browse files

x86: move init_memory_mapping() to common mm/init.c 



Impact: cleanup

This patch moves the init_memory_mapping() function to common mm/init.c.

Signed-off-by: default avatarPekka Enberg <penberg@cs.helsinki.fi>
Cc: Yinghai Lu <yinghai@kernel.org>
LKML-Reference: <1236257708-27269-14-git-send-email-penberg@cs.helsinki.fi>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 0c0f756f

arch/x86/mm/init.c

+328 −0
Original line number Diff line number Diff line
@@ -2,10 +2,338 @@ 
#include <linux/swap.h>



#include <asm/cacheflush.h>

#include <asm/e820.h>

#include <asm/page.h>

#include <asm/page_types.h>

#include <asm/sections.h>

#include <asm/system.h>

#include <asm/tlbflush.h>



#ifdef CONFIG_X86_32

extern void __init early_ioremap_page_table_range_init(void);

extern void __init kernel_physical_mapping_init(unsigned long start_pfn,

						unsigned long end_pfn,

						int use_pse);

#endif



#ifdef CONFIG_X86_64

extern unsigned long __meminit

kernel_physical_mapping_init(unsigned long start,

			     unsigned long end,

			     unsigned long page_size_mask);

#endif



unsigned long __initdata table_start;

unsigned long __meminitdata table_end;

unsigned long __meminitdata 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;

	table_start = find_e820_area(start, max_pfn_mapped<<PAGE_SHIFT,

					tables, PAGE_SIZE);

#else /* CONFIG_X86_64 */

	start = 0x8000;

	table_start = find_e820_area(start, end, tables, PAGE_SIZE);

#endif

	if (table_start == -1UL)

		panic("Cannot find space for the kernel page tables");



	table_start >>= PAGE_SHIFT;

	table_end = table_start;

	table_top = table_start + (tables >> PAGE_SHIFT);



	printk(KERN_DEBUG "kernel direct mapping tables up to %lx @ %lx-%lx\n",

		end, table_start << PAGE_SHIFT, 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 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;

}



#ifdef CONFIG_X86_64

static void __init init_gbpages(void)

{

	if (direct_gbpages && cpu_has_gbpages)

		printk(KERN_INFO "Using GB pages for direct mapping\n");

	else

		direct_gbpages = 0;

}

#else

static inline void init_gbpages(void)

{

}

#endif



/*

 * 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 pos;

	unsigned long ret;



	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 (!after_bootmem)

		init_gbpages();



#ifdef CONFIG_DEBUG_PAGEALLOC

	/*

	 * 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



#ifdef CONFIG_X86_32

#ifdef CONFIG_X86_PAE

	set_nx();

	if (nx_enabled)

		printk(KERN_INFO "NX (Execute Disable) protection: active\n");

#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;

	}

#endif



	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);



#ifdef CONFIG_X86_32

	for (i = 0; i < nr_range; i++)

		kernel_physical_mapping_init(

				mr[i].start >> PAGE_SHIFT,

				mr[i].end >> PAGE_SHIFT,

				mr[i].page_size_mask == (1<<PG_LEVEL_2M));

	ret = end;

#else /* CONFIG_X86_64 */

	for (i = 0; i < nr_range; i++)

		ret = kernel_physical_mapping_init(mr[i].start, mr[i].end,

						   mr[i].page_size_mask);

#endif



#ifdef CONFIG_X86_32

	early_ioremap_page_table_range_init();



	load_cr3(swapper_pg_dir);

#endif



#ifdef CONFIG_X86_64

	if (!after_bootmem)

		mmu_cr4_features = read_cr4();

#endif

	__flush_tlb_all();



	if (!after_bootmem && table_end > table_start)

		reserve_early(table_start << PAGE_SHIFT,

				 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

arch/x86/mm/init_32.c

+7 −301
Original line number Diff line number Diff line
@@ -59,13 +59,9 @@ unsigned long highstart_pfn, highend_pfn; 
static noinline int do_test_wp_bit(void);





static unsigned long __initdata table_start;

static unsigned long __meminitdata table_end;

static unsigned long __meminitdata table_top;



int after_bootmem;



int direct_gbpages;

extern unsigned long __initdata table_start;

extern unsigned long __meminitdata table_end;

extern unsigned long __meminitdata table_top;



static __init void *alloc_low_page(void)

{
@@ -227,7 +223,7 @@ static inline int is_kernel_text(unsigned long addr) 
 * of max_low_pfn pages, by creating page tables starting from address

 * PAGE_OFFSET:

 */

static void __init kernel_physical_mapping_init(unsigned long start_pfn,

void __init kernel_physical_mapping_init(unsigned long start_pfn,

					 unsigned long end_pfn,

					 int use_pse)

{
@@ -509,7 +505,7 @@ void __init native_pagetable_setup_done(pgd_t *base) 
 * be partially populated, and so it avoids stomping on any existing

 * mappings.

 */

static void __init early_ioremap_page_table_range_init(void)

void __init early_ioremap_page_table_range_init(void)

{

	pgd_t *pgd_base = swapper_pg_dir;

	unsigned long vaddr, end;
@@ -834,296 +830,6 @@ void __init setup_bootmem_allocator(void) 
	after_bootmem = 1;

}



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;

	table_start = find_e820_area(start, max_pfn_mapped<<PAGE_SHIFT,

					tables, PAGE_SIZE);

#else /* CONFIG_X86_64 */

	start = 0x8000;

	table_start = find_e820_area(start, end, tables, PAGE_SIZE);

#endif

	if (table_start == -1UL)

		panic("Cannot find space for the kernel page tables");



	table_start >>= PAGE_SHIFT;

	table_end = table_start;

	table_top = table_start + (tables >> PAGE_SHIFT);



	printk(KERN_DEBUG "kernel direct mapping tables up to %lx @ %lx-%lx\n",

		end, table_start << PAGE_SHIFT, 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 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;

}



static inline void init_gbpages(void)

{

}



/*

 * 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 pos;

	unsigned long ret;



	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 (!after_bootmem)

		init_gbpages();



#ifdef CONFIG_DEBUG_PAGEALLOC

	/*

	 * 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



#ifdef CONFIG_X86_32

#ifdef CONFIG_X86_PAE

	set_nx();

	if (nx_enabled)

		printk(KERN_INFO "NX (Execute Disable) protection: active\n");

#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;

	}

#endif



	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);



#ifdef CONFIG_X86_32

	for (i = 0; i < nr_range; i++)

		kernel_physical_mapping_init(

				mr[i].start >> PAGE_SHIFT,

				mr[i].end >> PAGE_SHIFT,

				mr[i].page_size_mask == (1<<PG_LEVEL_2M));

	ret = end;

#else /* CONFIG_X86_64 */

	for (i = 0; i < nr_range; i++)

		ret = kernel_physical_mapping_init(mr[i].start, mr[i].end,

						   mr[i].page_size_mask);

#endif



#ifdef CONFIG_X86_32

	early_ioremap_page_table_range_init();



	load_cr3(swapper_pg_dir);

#endif



#ifdef CONFIG_X86_64

	if (!after_bootmem)

		mmu_cr4_features = read_cr4();

#endif

	__flush_tlb_all();



	if (!after_bootmem && table_end > table_start)

		reserve_early(table_start << PAGE_SHIFT,

				 table_end << PAGE_SHIFT, "PGTABLE");



	if (!after_bootmem)

		early_memtest(start, end);



	return ret >> PAGE_SHIFT;

}





/*

 * paging_init() sets up the page tables - note that the first 8MB are

 * already mapped by head.S.

arch/x86/mm/init_64.c

+7 −307

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