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Commit aece2785 authored by Yinghai Lu's avatar Yinghai Lu Committed by H. Peter Anvin
Browse files

x86, 64bit, mm: Add generic kernel/ident mapping helper 



It is simple version for kernel_physical_mapping_init.
it will work to build one page table that will be used later.

Use mapping_info to control
        1. alloc_pg_page method
        2. if PMD is EXEC,
        3. if pgd is with kernel low mapping or ident mapping.

Will use to replace some local versions in kexec, hibernation and etc.

Signed-off-by: default avatarYinghai Lu <yinghai@kernel.org>
Link: http://lkml.kernel.org/r/1359058816-7615-8-git-send-email-yinghai@kernel.org


Signed-off-by: default avatarH. Peter Anvin <hpa@linux.intel.com>
parent 231b3642

arch/x86/include/asm/init.h

+9 −0
Original line number Diff line number Diff line 
#ifndef _ASM_X86_INIT_H

#define _ASM_X86_INIT_H



struct x86_mapping_info {

	void *(*alloc_pgt_page)(void *); /* allocate buf for page table */

	void *context;			 /* context for alloc_pgt_page */

	unsigned long pmd_flag;		 /* page flag for PMD entry */

	bool kernel_mapping;		 /* kernel mapping or ident mapping */

};



int kernel_ident_mapping_init(struct x86_mapping_info *info, pgd_t *pgd_page,

				unsigned long addr, unsigned long end);



#endif /* _ASM_X86_INIT_H */

arch/x86/mm/init_64.c

+74 −0
Original line number Diff line number Diff line
@@ -56,6 +56,80 @@ 


#include "mm_internal.h"



static void ident_pmd_init(unsigned long pmd_flag, pmd_t *pmd_page,

			   unsigned long addr, unsigned long end)

{

	addr &= PMD_MASK;

	for (; addr < end; addr += PMD_SIZE) {

		pmd_t *pmd = pmd_page + pmd_index(addr);



		if (!pmd_present(*pmd))

			set_pmd(pmd, __pmd(addr | pmd_flag));

	}

}

static int ident_pud_init(struct x86_mapping_info *info, pud_t *pud_page,

			  unsigned long addr, unsigned long end)

{

	unsigned long next;



	for (; addr < end; addr = next) {

		pud_t *pud = pud_page + pud_index(addr);

		pmd_t *pmd;



		next = (addr & PUD_MASK) + PUD_SIZE;

		if (next > end)

			next = end;



		if (pud_present(*pud)) {

			pmd = pmd_offset(pud, 0);

			ident_pmd_init(info->pmd_flag, pmd, addr, next);

			continue;

		}

		pmd = (pmd_t *)info->alloc_pgt_page(info->context);

		if (!pmd)

			return -ENOMEM;

		ident_pmd_init(info->pmd_flag, pmd, addr, next);

		set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE));

	}



	return 0;

}



int kernel_ident_mapping_init(struct x86_mapping_info *info, pgd_t *pgd_page,

			      unsigned long addr, unsigned long end)

{

	unsigned long next;

	int result;

	int off = info->kernel_mapping ? pgd_index(__PAGE_OFFSET) : 0;



	for (; addr < end; addr = next) {

		pgd_t *pgd = pgd_page + pgd_index(addr) + off;

		pud_t *pud;



		next = (addr & PGDIR_MASK) + PGDIR_SIZE;

		if (next > end)

			next = end;



		if (pgd_present(*pgd)) {

			pud = pud_offset(pgd, 0);

			result = ident_pud_init(info, pud, addr, next);

			if (result)

				return result;

			continue;

		}



		pud = (pud_t *)info->alloc_pgt_page(info->context);

		if (!pud)

			return -ENOMEM;

		result = ident_pud_init(info, pud, addr, next);

		if (result)

			return result;

		set_pgd(pgd, __pgd(__pa(pud) | _KERNPG_TABLE));

	}



	return 0;

}



static int __init parse_direct_gbpages_off(char *arg)

{

	direct_gbpages = 0;