LCOV - code coverage report
Current view: top level - include/linux - highmem.h (source / functions) Hit Total Coverage
Test: coverage.info Lines: 1 1 100.0 %
Date: 2017-01-25 Functions: 0 0 -

          Line data    Source code
       1             : #ifndef _LINUX_HIGHMEM_H
       2             : #define _LINUX_HIGHMEM_H
       3             : 
       4             : #include <linux/fs.h>
       5             : #include <linux/mm.h>
       6             : #include <linux/uaccess.h>
       7             : 
       8             : #include <asm/cacheflush.h>
       9             : 
      10             : #ifndef ARCH_HAS_FLUSH_ANON_PAGE
      11             : static inline void flush_anon_page(struct vm_area_struct *vma, struct page *page, unsigned long vmaddr)
      12             : {
      13             : }
      14             : #endif
      15             : 
      16             : #ifndef ARCH_HAS_FLUSH_KERNEL_DCACHE_PAGE
      17             : static inline void flush_kernel_dcache_page(struct page *page)
      18             : {
      19             : }
      20             : #endif
      21             : 
      22             : #include <asm/kmap_types.h>
      23             : 
      24             : #if defined(CONFIG_DEBUG_HIGHMEM) && defined(CONFIG_TRACE_IRQFLAGS_SUPPORT)
      25             : 
      26             : void debug_kmap_atomic(enum km_type type);
      27             : 
      28             : #else
      29             : 
      30             : static inline void debug_kmap_atomic(enum km_type type)
      31             : {
      32             : }
      33             : 
      34             : #endif
      35             : 
      36             : #ifdef CONFIG_HIGHMEM
      37             : #include <asm/highmem.h>
      38             : 
      39             : /* declarations for linux/mm/highmem.c */
      40             : unsigned int nr_free_highpages(void);
      41             : extern unsigned long totalhigh_pages;
      42             : 
      43             : void kmap_flush_unused(void);
      44             : 
      45             : #else /* CONFIG_HIGHMEM */
      46             : 
      47             : static inline unsigned int nr_free_highpages(void) { return 0; }
      48             : 
      49             : #define totalhigh_pages 0UL
      50             : 
      51             : #ifndef ARCH_HAS_KMAP
      52             : static inline void *kmap(struct page *page)
      53             : {
      54             :         might_sleep();
      55             :         return page_address(page);
      56             : }
      57             : 
      58             : static inline void kunmap(struct page *page)
      59             : {
      60             : }
      61             : 
      62             : static inline void *kmap_atomic(struct page *page, enum km_type idx)
      63             : {
      64             :         pagefault_disable();
      65             :         return page_address(page);
      66             : }
      67             : #define kmap_atomic_prot(page, idx, prot)       kmap_atomic(page, idx)
      68             : 
      69             : #define kunmap_atomic(addr, idx)        do { pagefault_enable(); } while (0)
      70             : #define kmap_atomic_pfn(pfn, idx)       kmap_atomic(pfn_to_page(pfn), (idx))
      71             : #define kmap_atomic_to_page(ptr)        virt_to_page(ptr)
      72             : 
      73             : #define kmap_flush_unused()     do {} while(0)
      74             : #endif
      75             : 
      76             : #endif /* CONFIG_HIGHMEM */
      77             : 
      78             : /* when CONFIG_HIGHMEM is not set these will be plain clear/copy_page */
      79             : #ifndef clear_user_highpage
      80             : static inline void clear_user_highpage(struct page *page, unsigned long vaddr)
      81             : {
      82             :         void *addr = kmap_atomic(page, KM_USER0);
      83             :         clear_user_page(addr, vaddr, page);
      84             :         kunmap_atomic(addr, KM_USER0);
      85             : }
      86             : #endif
      87             : 
      88             : #ifndef __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
      89             : /**
      90             :  * __alloc_zeroed_user_highpage - Allocate a zeroed HIGHMEM page for a VMA with caller-specified movable GFP flags
      91             :  * @movableflags: The GFP flags related to the pages future ability to move like __GFP_MOVABLE
      92             :  * @vma: The VMA the page is to be allocated for
      93             :  * @vaddr: The virtual address the page will be inserted into
      94             :  *
      95             :  * This function will allocate a page for a VMA but the caller is expected
      96             :  * to specify via movableflags whether the page will be movable in the
      97             :  * future or not
      98             :  *
      99             :  * An architecture may override this function by defining
     100             :  * __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE and providing their own
     101             :  * implementation.
     102             :  */
     103             : static inline struct page *
     104             : __alloc_zeroed_user_highpage(gfp_t movableflags,
     105             :                         struct vm_area_struct *vma,
     106             :                         unsigned long vaddr)
     107             : {
     108             :         struct page *page = alloc_page_vma(GFP_HIGHUSER | movableflags,
     109             :                         vma, vaddr);
     110             : 
     111             :         if (page)
     112             :                 clear_user_highpage(page, vaddr);
     113             : 
     114             :         return page;
     115             : }
     116             : #endif
     117             : 
     118             : /**
     119             :  * alloc_zeroed_user_highpage_movable - Allocate a zeroed HIGHMEM page for a VMA that the caller knows can move
     120             :  * @vma: The VMA the page is to be allocated for
     121             :  * @vaddr: The virtual address the page will be inserted into
     122             :  *
     123             :  * This function will allocate a page for a VMA that the caller knows will
     124             :  * be able to migrate in the future using move_pages() or reclaimed
     125             :  */
     126             : static inline struct page *
     127             : alloc_zeroed_user_highpage_movable(struct vm_area_struct *vma,
     128             :                                         unsigned long vaddr)
     129             : {
     130             :         return __alloc_zeroed_user_highpage(__GFP_MOVABLE, vma, vaddr);
     131             : }
     132             : 
     133             : static inline void clear_highpage(struct page *page)
     134             : {
     135             :         void *kaddr = kmap_atomic(page, KM_USER0);
     136             :         clear_page(kaddr);
     137             :         kunmap_atomic(kaddr, KM_USER0);
     138             : }
     139             : 
     140             : static inline void zero_user_segments(struct page *page,
     141             :         unsigned start1, unsigned end1,
     142             :         unsigned start2, unsigned end2)
     143             : {
     144             :         void *kaddr = kmap_atomic(page, KM_USER0);
     145             : 
     146             :         BUG_ON(end1 > PAGE_SIZE || end2 > PAGE_SIZE);
     147             : 
     148             :         if (end1 > start1)
     149             :                 memset(kaddr + start1, 0, end1 - start1);
     150             : 
     151             :         if (end2 > start2)
     152             :                 memset(kaddr + start2, 0, end2 - start2);
     153             : 
     154             :         kunmap_atomic(kaddr, KM_USER0);
     155             :         flush_dcache_page(page);
     156             : }
     157             : 
     158             : static inline void zero_user_segment(struct page *page,
     159             :         unsigned start, unsigned end)
     160             : {
     161             :         zero_user_segments(page, start, end, 0, 0);
     162             : }
     163             : 
     164             : static inline void zero_user(struct page *page,
     165             :         unsigned start, unsigned size)
     166             : {
     167             :         zero_user_segments(page, start, start + size, 0, 0);
     168             : }
     169             : 
     170             : static inline void __deprecated memclear_highpage_flush(struct page *page,
     171             :                         unsigned int offset, unsigned int size)
     172             : {
     173             :         zero_user(page, offset, size);
     174             : }
     175             : 
     176             : #ifndef __HAVE_ARCH_COPY_USER_HIGHPAGE
     177             : 
     178             : static inline void copy_user_highpage(struct page *to, struct page *from,
     179             :         unsigned long vaddr, struct vm_area_struct *vma)
     180             : {
     181             :         char *vfrom, *vto;
     182             : 
     183             :         vfrom = kmap_atomic(from, KM_USER0);
     184             :         vto = kmap_atomic(to, KM_USER1);
     185             :         copy_user_page(vto, vfrom, vaddr, to);
     186             :         kunmap_atomic(vfrom, KM_USER0);
     187             :         kunmap_atomic(vto, KM_USER1);
     188             : }
     189             : 
     190             : #endif
     191             : 
     192             : static inline void copy_highpage(struct page *to, struct page *from)
     193             : {
     194             :         char *vfrom, *vto;
     195             : 
     196             :         vfrom = kmap_atomic(from, KM_USER0);
     197             :         vto = kmap_atomic(to, KM_USER1);
     198             :         copy_page(vto, vfrom);
     199             :         kunmap_atomic(vfrom, KM_USER0);
     200             :         kunmap_atomic(vto, KM_USER1);
     201             : }
     202           1 : 
     203             : #endif /* _LINUX_HIGHMEM_H */

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