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#ifndef _LINUX_HIGHMEM_H

#define _LINUX_HIGHMEM_H

#include <linux/fs.h>

#include <linux/mm.h>

#include <linux/uaccess.h>

#include <asm/cacheflush.h>

#ifndef ARCH_HAS_FLUSH_ANON_PAGE

static inline void flush_anon_page(struct vm_area_struct *vma, struct page *page, unsigned long vmaddr)

{

}

#endif

#ifndef ARCH_HAS_FLUSH_KERNEL_DCACHE_PAGE

static inline void flush_kernel_dcache_page(struct page *page)

{

}

#endif

#ifdef CONFIG_HIGHMEM

#include <asm/highmem.h>

/* declarations for linux/mm/highmem.c */

unsigned int nr_free_highpages(void);

extern unsigned long totalhigh_pages;

void kmap_flush_unused(void);

#else /* CONFIG_HIGHMEM */

static inline unsigned int nr_free_highpages(void) { return 0; }

#define totalhigh_pages 0

#ifndef ARCH_HAS_KMAP

static inline void *kmap(struct page *page)

{

        might_sleep();

        return page_address(page);

}

#define kunmap(page) do { (void) (page); } while (0)

#include <asm/kmap_types.h>

static inline void *kmap_atomic(struct page *page, enum km_type idx)

{

        pagefault_disable();

        return page_address(page);

}

#define kmap_atomic_prot(page, idx, prot)       kmap_atomic(page, idx)

#define kunmap_atomic(addr, idx)        do { pagefault_enable(); } while (0)

#define kmap_atomic_pfn(pfn, idx)       kmap_atomic(pfn_to_page(pfn), (idx))

#define kmap_atomic_to_page(ptr)        virt_to_page(ptr)

#define kmap_flush_unused()     do {} while(0)

#endif

#endif /* CONFIG_HIGHMEM */

/* when CONFIG_HIGHMEM is not set these will be plain clear/copy_page */

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);

        /* Make sure this page is cleared on other CPU's too before using it */

        smp_wmb();

}

#ifndef __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE

/**

 * __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.

 */

static inline struct page *

__alloc_zeroed_user_highpage(gfp_t movableflags,

                        struct vm_area_struct *vma,

                        unsigned long vaddr)

{

        struct page *page = alloc_page_vma(GFP_HIGHUSER | movableflags,

                        vma, vaddr);

        if (page)

                clear_user_highpage(page, vaddr);

        return page;

}

#endif

/**

 * 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);

}

static inline void clear_highpage(struct page *page)

{

        void *kaddr = kmap_atomic(page, KM_USER0);

        clear_page(kaddr);

        kunmap_atomic(kaddr, KM_USER0);

}

/*

 * Same but also flushes aliased cache contents to RAM.

 *

 * This must be a macro because KM_USER0 and friends aren't defined if

 * !CONFIG_HIGHMEM

 */

#define zero_user_page(page, offset, size, km_type)             \

        do {                                                    \

                void *kaddr;                                    \

                                                                \

                BUG_ON((offset) + (size) > PAGE_SIZE);          \

                                                                \

                kaddr = kmap_atomic(page, km_type);             \

                memset((char *)kaddr + (offset), 0, (size));     \

                flush_dcache_page(page);                        \

                kunmap_atomic(kaddr, (km_type));                \

        } while (0)

static inline void __deprecated memclear_highpage_flush(struct page *page,

                        unsigned int offset, unsigned int size)

{

        zero_user_page(page, offset, size, KM_USER0);

}

#ifndef __HAVE_ARCH_COPY_USER_HIGHPAGE

static inline void copy_user_highpage(struct page *to, struct page *from,

        unsigned long vaddr, struct vm_area_struct *vma)

{

        char *vfrom, *vto;

        vfrom = kmap_atomic(from, KM_USER0);

        vto = kmap_atomic(to, KM_USER1);

        copy_user_page(vto, vfrom, vaddr, to);

        kunmap_atomic(vfrom, KM_USER0);

        kunmap_atomic(vto, KM_USER1);

        /* Make sure this page is cleared on other CPU's too before using it */

        smp_wmb();

}

#endif

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);

        kunmap_atomic(vfrom, KM_USER0);

        kunmap_atomic(vto, KM_USER1);

}

#endif /* _LINUX_HIGHMEM_H */