C++ (Cpp) set_pmd_pte Beispiele

Beispiel #1

Datei: pageattr.c Projekt: devicenull/supermicro_ipmi_firmware

static int
__change_page_attr(struct page *page, pgprot_t prot)
{ 
	pte_t *kpte; 
	unsigned long address;
	struct page *kpte_page;

	BUG_ON(PageHighMem(page));
	address = (unsigned long)page_address(page);

	kpte = lookup_address(address);
	if (!kpte)
		return -EINVAL;
	kpte_page = virt_to_page(kpte);
	if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL)) { 
		if ((pte_val(*kpte) & _PAGE_PSE) == 0) { 
			set_pte_atomic(kpte, mk_pte(page, prot)); 
		} else {
			pgprot_t ref_prot;
			struct page *split;

			ref_prot =
			((address & LARGE_PAGE_MASK) < (unsigned long)&_etext)
				? PAGE_KERNEL_EXEC : PAGE_KERNEL;
			split = split_large_page(address, prot, ref_prot);
			if (!split)
				return -ENOMEM;
			set_pmd_pte(kpte,address,mk_pte(split, ref_prot));
			kpte_page = split;
		}
		page_private(kpte_page)++;
	} else if ((pte_val(*kpte) & _PAGE_PSE) == 0) { 
		set_pte_atomic(kpte, mk_pte(page, PAGE_KERNEL));
		BUG_ON(page_private(kpte_page) == 0);
		page_private(kpte_page)--;
	} else
		BUG();

	/*
	 * If the pte was reserved, it means it was created at boot
	 * time (not via split_large_page) and in turn we must not
	 * replace it with a largepage.
	 */
	if (!PageReserved(kpte_page)) {
		if (cpu_has_pse && (page_private(kpte_page) == 0)) {
			ClearPagePrivate(kpte_page);
			list_add(&kpte_page->lru, &df_list);
			revert_page(kpte_page, address);
		}
	}
	return 0;
} 

Beispiel #2

Datei: pageattr.c Projekt: 1x23/unifi-gpl

static int
__change_page_attr(struct page *page, pgprot_t prot)
{ 
	pte_t *kpte; 
	unsigned long address;
	struct page *kpte_page;

	BUG_ON(PageHighMem(page));
	address = (unsigned long)page_address(page);

	kpte = lookup_address(address);
	if (!kpte)
		return -EINVAL;
	kpte_page = virt_to_page(kpte);
	if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL)) { 
		if ((pte_val(*kpte) & _PAGE_PSE) == 0) { 
			set_pte_atomic(kpte, mk_pte(page, prot)); 
		} else {
			struct page *split = split_large_page(address, prot); 
			if (!split)
				return -ENOMEM;
			set_pmd_pte(kpte,address,mk_pte(split, PAGE_KERNEL));
			kpte_page = split;
		}	
		get_page(kpte_page);
	} else if ((pte_val(*kpte) & _PAGE_PSE) == 0) { 
		set_pte_atomic(kpte, mk_pte(page, PAGE_KERNEL));
		__put_page(kpte_page);
	} else
		BUG();

	/*
	 * If the pte was reserved, it means it was created at boot
	 * time (not via split_large_page) and in turn we must not
	 * replace it with a largepage.
	 */
	if (!PageReserved(kpte_page)) {
		/* memleak and potential failed 2M page regeneration */
		BUG_ON(!page_count(kpte_page));

		if (cpu_has_pse && (page_count(kpte_page) == 1)) {
			list_add(&kpte_page->lru, &df_list);
			revert_page(kpte_page, address);
		}
	}
	return 0;
}