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include/linux/highmem.h
5.98 KB
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#ifndef _LINUX_HIGHMEM_H #define _LINUX_HIGHMEM_H |
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#include <linux/fs.h> |
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#include <linux/kernel.h> |
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#include <linux/mm.h> |
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#include <linux/uaccess.h> |
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#include <linux/hardirq.h> |
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#include <asm/cacheflush.h> |
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#ifndef ARCH_HAS_FLUSH_ANON_PAGE |
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static inline void flush_anon_page(struct vm_area_struct *vma, struct page *page, unsigned long vmaddr) |
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{ } #endif |
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#ifndef ARCH_HAS_FLUSH_KERNEL_DCACHE_PAGE static inline void flush_kernel_dcache_page(struct page *page) { } |
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static inline void flush_kernel_vmap_range(void *vaddr, int size) { } static inline void invalidate_kernel_vmap_range(void *vaddr, int size) { } |
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#endif |
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#include <asm/kmap_types.h> |
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#ifdef CONFIG_HIGHMEM |
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#include <asm/highmem.h> /* declarations for linux/mm/highmem.c */ unsigned int nr_free_highpages(void); |
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extern unsigned long totalhigh_pages; |
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void kmap_flush_unused(void); |
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#else /* CONFIG_HIGHMEM */ static inline unsigned int nr_free_highpages(void) { return 0; } |
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#define totalhigh_pages 0UL |
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#ifndef ARCH_HAS_KMAP |
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static inline void *kmap(struct page *page) { might_sleep(); return page_address(page); } |
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static inline void kunmap(struct page *page) { } |
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static inline void *__kmap_atomic(struct page *page) |
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{ pagefault_disable(); return page_address(page); } |
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#define kmap_atomic_prot(page, prot) __kmap_atomic(page) |
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static inline void __kunmap_atomic(void *addr) |
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{ pagefault_enable(); } |
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#define kmap_atomic_pfn(pfn) kmap_atomic(pfn_to_page(pfn)) |
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#define kmap_atomic_to_page(ptr) virt_to_page(ptr) |
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#define kmap_flush_unused() do {} while(0) |
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#endif |
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#endif /* CONFIG_HIGHMEM */ |
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#if defined(CONFIG_HIGHMEM) || defined(CONFIG_X86_32) DECLARE_PER_CPU(int, __kmap_atomic_idx); static inline int kmap_atomic_idx_push(void) { |
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int idx = __this_cpu_inc_return(__kmap_atomic_idx) - 1; |
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#ifdef CONFIG_DEBUG_HIGHMEM WARN_ON_ONCE(in_irq() && !irqs_disabled()); BUG_ON(idx > KM_TYPE_NR); #endif return idx; } |
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static inline int kmap_atomic_idx(void) { |
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return __this_cpu_read(__kmap_atomic_idx) - 1; |
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} |
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static inline void kmap_atomic_idx_pop(void) |
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{ |
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#ifdef CONFIG_DEBUG_HIGHMEM |
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int idx = __this_cpu_dec_return(__kmap_atomic_idx); |
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BUG_ON(idx < 0); |
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#else __this_cpu_dec(__kmap_atomic_idx); |
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#endif |
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} #endif |
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/* * Make both: kmap_atomic(page, idx) and kmap_atomic(page) work. */ #define kmap_atomic(page, args...) __kmap_atomic(page) /* * Prevent people trying to call kunmap_atomic() as if it were kunmap() * kunmap_atomic() should get the return value of kmap_atomic, not the page. */ #define kunmap_atomic(addr, args...) \ do { \ BUILD_BUG_ON(__same_type((addr), struct page *)); \ __kunmap_atomic(addr); \ } while (0) |
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/* when CONFIG_HIGHMEM is not set these will be plain clear/copy_page */ |
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#ifndef clear_user_highpage |
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static inline void clear_user_highpage(struct page *page, unsigned long vaddr) { void *addr = kmap_atomic(page, KM_USER0); clear_user_page(addr, vaddr, page); kunmap_atomic(addr, KM_USER0); |
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} |
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#endif |
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#ifndef __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE |
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/** * __alloc_zeroed_user_highpage - Allocate a zeroed HIGHMEM page for a VMA with caller-specified movable GFP flags * @movableflags: The GFP flags related to the pages future ability to move like __GFP_MOVABLE * @vma: The VMA the page is to be allocated for * @vaddr: The virtual address the page will be inserted into * * This function will allocate a page for a VMA but the caller is expected * to specify via movableflags whether the page will be movable in the * future or not * * An architecture may override this function by defining * __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE and providing their own * implementation. */ |
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static inline struct page * |
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__alloc_zeroed_user_highpage(gfp_t movableflags, struct vm_area_struct *vma, unsigned long vaddr) |
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{ |
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struct page *page = alloc_page_vma(GFP_HIGHUSER | movableflags, vma, vaddr); |
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if (page) clear_user_highpage(page, vaddr); return page; } #endif |
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/** |
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* alloc_zeroed_user_highpage_movable - Allocate a zeroed HIGHMEM page for a VMA that the caller knows can move * @vma: The VMA the page is to be allocated for * @vaddr: The virtual address the page will be inserted into * * This function will allocate a page for a VMA that the caller knows will * be able to migrate in the future using move_pages() or reclaimed */ static inline struct page * alloc_zeroed_user_highpage_movable(struct vm_area_struct *vma, unsigned long vaddr) { return __alloc_zeroed_user_highpage(__GFP_MOVABLE, vma, vaddr); } |
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static inline void clear_highpage(struct page *page) { void *kaddr = kmap_atomic(page, KM_USER0); clear_page(kaddr); kunmap_atomic(kaddr, KM_USER0); } |
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static inline void zero_user_segments(struct page *page, unsigned start1, unsigned end1, unsigned start2, unsigned end2) { void *kaddr = kmap_atomic(page, KM_USER0); BUG_ON(end1 > PAGE_SIZE || end2 > PAGE_SIZE); if (end1 > start1) memset(kaddr + start1, 0, end1 - start1); if (end2 > start2) memset(kaddr + start2, 0, end2 - start2); kunmap_atomic(kaddr, KM_USER0); flush_dcache_page(page); } static inline void zero_user_segment(struct page *page, unsigned start, unsigned end) { zero_user_segments(page, start, end, 0, 0); } static inline void zero_user(struct page *page, unsigned start, unsigned size) { zero_user_segments(page, start, start + size, 0, 0); } |
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static inline void __deprecated memclear_highpage_flush(struct page *page, |
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unsigned int offset, unsigned int size) |
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{ |
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zero_user(page, offset, size); |
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} |
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#ifndef __HAVE_ARCH_COPY_USER_HIGHPAGE |
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static inline void copy_user_highpage(struct page *to, struct page *from, unsigned long vaddr, struct vm_area_struct *vma) |
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{ char *vfrom, *vto; vfrom = kmap_atomic(from, KM_USER0); vto = kmap_atomic(to, KM_USER1); copy_user_page(vto, vfrom, vaddr, to); |
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kunmap_atomic(vto, KM_USER1); |
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kunmap_atomic(vfrom, KM_USER0); |
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} |
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#endif |
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static inline void copy_highpage(struct page *to, struct page *from) { char *vfrom, *vto; vfrom = kmap_atomic(from, KM_USER0); vto = kmap_atomic(to, KM_USER1); copy_page(vto, vfrom); |
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kunmap_atomic(vto, KM_USER1); |
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kunmap_atomic(vfrom, KM_USER0); |
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} #endif /* _LINUX_HIGHMEM_H */ |