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262 lines
6.0 KiB
262 lines
6.0 KiB
#ifndef _LINUX_HIGHMEM_H |
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#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/bug.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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{ |
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} |
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#endif |
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#ifndef ARCH_HAS_FLUSH_KERNEL_DCACHE_PAGE |
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static inline void flush_kernel_dcache_page(struct page *page) |
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{ |
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} |
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static inline void flush_kernel_vmap_range(void *vaddr, int size) |
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{ |
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} |
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static inline void invalidate_kernel_vmap_range(void *vaddr, int size) |
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{ |
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} |
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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> |
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/* declarations for linux/mm/highmem.c */ |
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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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struct page *kmap_to_page(void *addr); |
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#else /* CONFIG_HIGHMEM */ |
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static inline unsigned int nr_free_highpages(void) { return 0; } |
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static inline struct page *kmap_to_page(void *addr) |
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{ |
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return virt_to_page(addr); |
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} |
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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) |
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{ |
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might_sleep(); |
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return page_address(page); |
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} |
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static inline void kunmap(struct page *page) |
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{ |
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} |
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static inline void *kmap_atomic(struct page *page) |
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{ |
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preempt_disable(); |
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pagefault_disable(); |
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return page_address(page); |
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} |
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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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{ |
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pagefault_enable(); |
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preempt_enable(); |
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} |
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#define kmap_atomic_pfn(pfn) kmap_atomic(pfn_to_page(pfn)) |
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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) |
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DECLARE_PER_CPU(int, __kmap_atomic_idx); |
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static inline int kmap_atomic_idx_push(void) |
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{ |
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int idx = __this_cpu_inc_return(__kmap_atomic_idx) - 1; |
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#ifdef CONFIG_DEBUG_HIGHMEM |
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WARN_ON_ONCE(in_irq() && !irqs_disabled()); |
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BUG_ON(idx >= KM_TYPE_NR); |
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#endif |
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return idx; |
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} |
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static inline int kmap_atomic_idx(void) |
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{ |
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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 |
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__this_cpu_dec(__kmap_atomic_idx); |
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#endif |
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} |
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#endif |
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/* |
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* Prevent people trying to call kunmap_atomic() as if it were kunmap() |
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* kunmap_atomic() should get the return value of kmap_atomic, not the page. |
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*/ |
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#define kunmap_atomic(addr) \ |
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do { \ |
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BUILD_BUG_ON(__same_type((addr), struct page *)); \ |
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__kunmap_atomic(addr); \ |
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} 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) |
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{ |
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void *addr = kmap_atomic(page); |
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clear_user_page(addr, vaddr, page); |
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kunmap_atomic(addr); |
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} |
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#endif |
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#ifndef __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE |
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/** |
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* __alloc_zeroed_user_highpage - Allocate a zeroed HIGHMEM page for a VMA with caller-specified movable GFP flags |
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* @movableflags: The GFP flags related to the pages future ability to move like __GFP_MOVABLE |
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* @vma: The VMA the page is to be allocated for |
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* @vaddr: The virtual address the page will be inserted into |
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* |
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* This function will allocate a page for a VMA but the caller is expected |
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* to specify via movableflags whether the page will be movable in the |
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* future or not |
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* |
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* An architecture may override this function by defining |
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* __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE and providing their own |
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* implementation. |
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*/ |
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static inline struct page * |
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__alloc_zeroed_user_highpage(gfp_t movableflags, |
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struct vm_area_struct *vma, |
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unsigned long vaddr) |
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{ |
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struct page *page = alloc_page_vma(GFP_HIGHUSER | movableflags, |
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vma, vaddr); |
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if (page) |
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clear_user_highpage(page, vaddr); |
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return page; |
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} |
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#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 |
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* @vma: The VMA the page is to be allocated for |
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* @vaddr: The virtual address the page will be inserted into |
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* |
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* This function will allocate a page for a VMA that the caller knows will |
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* be able to migrate in the future using move_pages() or reclaimed |
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*/ |
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static inline struct page * |
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alloc_zeroed_user_highpage_movable(struct vm_area_struct *vma, |
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unsigned long vaddr) |
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{ |
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return __alloc_zeroed_user_highpage(__GFP_MOVABLE, vma, vaddr); |
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} |
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static inline void clear_highpage(struct page *page) |
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{ |
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void *kaddr = kmap_atomic(page); |
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clear_page(kaddr); |
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kunmap_atomic(kaddr); |
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} |
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static inline void sanitize_highpage(struct page *page) |
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{ |
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void *kaddr; |
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unsigned long flags; |
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local_irq_save(flags); |
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kaddr = kmap_atomic(page); |
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clear_page(kaddr); |
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kunmap_atomic(kaddr); |
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local_irq_restore(flags); |
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} |
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static inline void zero_user_segments(struct page *page, |
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unsigned start1, unsigned end1, |
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unsigned start2, unsigned end2) |
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{ |
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void *kaddr = kmap_atomic(page); |
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BUG_ON(end1 > PAGE_SIZE || end2 > PAGE_SIZE); |
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if (end1 > start1) |
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memset(kaddr + start1, 0, end1 - start1); |
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if (end2 > start2) |
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memset(kaddr + start2, 0, end2 - start2); |
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kunmap_atomic(kaddr); |
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flush_dcache_page(page); |
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} |
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static inline void zero_user_segment(struct page *page, |
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unsigned start, unsigned end) |
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{ |
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zero_user_segments(page, start, end, 0, 0); |
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} |
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static inline void zero_user(struct page *page, |
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unsigned start, unsigned size) |
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{ |
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zero_user_segments(page, start, start + size, 0, 0); |
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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, |
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unsigned long vaddr, struct vm_area_struct *vma) |
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{ |
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char *vfrom, *vto; |
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vfrom = kmap_atomic(from); |
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vto = kmap_atomic(to); |
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copy_user_page(vto, vfrom, vaddr, to); |
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kunmap_atomic(vto); |
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kunmap_atomic(vfrom); |
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} |
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#endif |
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static inline void copy_highpage(struct page *to, struct page *from) |
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{ |
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char *vfrom, *vto; |
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vfrom = kmap_atomic(from); |
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vto = kmap_atomic(to); |
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copy_page(vto, vfrom); |
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kunmap_atomic(vto); |
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kunmap_atomic(vfrom); |
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} |
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#endif /* _LINUX_HIGHMEM_H */
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