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Commit 44af6c41 authored by Ingo Molnar's avatar Ingo Molnar
Browse files

x86: backmerge 64-bit details into 32-bit pageattr.c 



backmerge 64-bit details into 32-bit pageattr.c.

the pageattr_32.c and pageattr_64.c files are now identical.

Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 31a0717c

arch/x86/mm/pageattr_32.c

+87 −47
Original line number Diff line number Diff line
@@ -39,12 +39,13 @@ pte_t *lookup_address(unsigned long address, int *level) 


static void __set_pmd_pte(pte_t *kpte, unsigned long address, pte_t pte)

{

	struct page *page;



	/* change init_mm */

	set_pte_atomic(kpte, pte);

#ifdef CONFIG_X86_32

	if (SHARED_KERNEL_PMD)

		return;

	{

		struct page *page;



		for (page = pgd_list; page; page = (struct page *)page->index) {

			pgd_t *pgd;
@@ -57,6 +58,8 @@ static void __set_pmd_pte(pte_t *kpte, unsigned long address, pte_t pte) 
			set_pte_atomic((pte_t *)pmd, pte);

		}

	}

#endif

}



static int split_large_page(pte_t *kpte, unsigned long address)

{
@@ -89,7 +92,9 @@ static int split_large_page(pte_t *kpte, unsigned long address) 
	address = __pa(address);

	addr = address & LARGE_PAGE_MASK;

	pbase = (pte_t *)page_address(base);

#ifdef CONFIG_X86_32

	paravirt_alloc_pt(&init_mm, page_to_pfn(base));

#endif



	for (i = 0; i < PTRS_PER_PTE; i++, addr += PAGE_SIZE)

		set_pte(&pbase[i], pfn_pte(addr >> PAGE_SHIFT, ref_prot));
@@ -109,15 +114,14 @@ static int split_large_page(pte_t *kpte, unsigned long address) 
	return 0;

}



static int __change_page_attr(struct page *page, pgprot_t prot)

static int

__change_page_attr(unsigned long address, struct page *page, pgprot_t prot)

{

	struct page *kpte_page;

	unsigned long address;

	int level, err = 0;

	pte_t *kpte;



	BUG_ON(PageHighMem(page));

	address = (unsigned long)page_address(page);



repeat:

	kpte = lookup_address(address, &level);
@@ -146,51 +150,87 @@ static int __change_page_attr(struct page *page, pgprot_t prot) 
	return err;

}



/*

 * Change the page attributes of an page in the linear mapping.

 *

 * This should be used when a page is mapped with a different caching policy

 * than write-back somewhere - some CPUs do not like it when mappings with

 * different caching policies exist. This changes the page attributes of the

 * in kernel linear mapping too.

/**

 * change_page_attr_addr - Change page table attributes in linear mapping

 * @address: Virtual address in linear mapping.

 * @numpages: Number of pages to change

 * @prot:    New page table attribute (PAGE_*)

 *

 * The caller needs to ensure that there are no conflicting mappings elsewhere.

 * This function only deals with the kernel linear map.

 * Change page attributes of a page in the direct mapping. This is a variant

 * of change_page_attr() that also works on memory holes that do not have

 * mem_map entry (pfn_valid() is false).

 *

 * Caller must call global_flush_tlb() after this.

 * See change_page_attr() documentation for more details.

 */

int change_page_attr(struct page *page, int numpages, pgprot_t prot)



int change_page_attr_addr(unsigned long address, int numpages, pgprot_t prot)

{

	int err = 0, i;

	int err = 0, kernel_map = 0, i;



#ifdef CONFIG_X86_64

	if (address >= __START_KERNEL_map &&

			address < __START_KERNEL_map + KERNEL_TEXT_SIZE) {



	for (i = 0; i < numpages; i++, page++) {

		err = __change_page_attr(page, prot);

		address = (unsigned long)__va(__pa(address));

		kernel_map = 1;

	}

#endif



	for (i = 0; i < numpages; i++, address += PAGE_SIZE) {

		unsigned long pfn = __pa(address) >> PAGE_SHIFT;



		if (!kernel_map || pte_present(pfn_pte(0, prot))) {

			err = __change_page_attr(address, pfn_to_page(pfn), prot);

			if (err)

				break;

		}

#ifdef CONFIG_X86_64

		/*

		 * Handle kernel mapping too which aliases part of

		 * lowmem:

		 */

		if (__pa(address) < KERNEL_TEXT_SIZE) {

			unsigned long addr2;

			pgprot_t prot2;



			addr2 = __START_KERNEL_map + __pa(address);

			/* Make sure the kernel mappings stay executable */

			prot2 = pte_pgprot(pte_mkexec(pfn_pte(0, prot)));

			err = __change_page_attr(addr2, pfn_to_page(pfn), prot2);

		}

#endif

	}



	return err;

}

EXPORT_SYMBOL(change_page_attr);



int change_page_attr_addr(unsigned long addr, int numpages, pgprot_t prot)

/**

 * change_page_attr - Change page table attributes in the linear mapping.

 * @page: First page to change

 * @numpages: Number of pages to change

 * @prot: New protection/caching type (PAGE_*)

 *

 * Returns 0 on success, otherwise a negated errno.

 *

 * This should be used when a page is mapped with a different caching policy

 * than write-back somewhere - some CPUs do not like it when mappings with

 * different caching policies exist. This changes the page attributes of the

 * in kernel linear mapping too.

 *

 * Caller must call global_flush_tlb() later to make the changes active.

 *

 * The caller needs to ensure that there are no conflicting mappings elsewhere

 * (e.g. in user space) * This function only deals with the kernel linear map.

 *

 * For MMIO areas without mem_map use change_page_attr_addr() instead.

 */

int change_page_attr(struct page *page, int numpages, pgprot_t prot)

{

	int i;

	unsigned long pfn = (__pa(addr) >> PAGE_SHIFT);

	unsigned long addr = (unsigned long)page_address(page);



	for (i = 0; i < numpages; i++) {

		if (!pfn_valid(pfn + i)) {

			WARN_ON_ONCE(1);

			break;

		} else {

			int level;

			pte_t *pte = lookup_address(addr + i*PAGE_SIZE, &level);

			BUG_ON(pte && pte_none(*pte));

		}

	}



	return change_page_attr(virt_to_page(addr), i, prot);

	return change_page_attr_addr(addr, numpages, prot);

}

EXPORT_SYMBOL(change_page_attr);



static void flush_kernel_map(void *arg)

{