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#include 

#include 

};

unsigned long vm_mmap(struct file *file, unsigned long addr,

         unsigned long len, unsigned long prot,

         unsigned long flag, unsigned long offset)

{

    char *mem, *ptr;

    int i;

    if (unlikely(offset + PAGE_ALIGN(len) < offset))

        return -EINVAL;

    if (unlikely(offset & ~PAGE_MASK))

        return -EINVAL;

    mem = UserAlloc(len);

    if(unlikely(mem == NULL))

        return -ENOMEM;

    for(i = offset, ptr = mem; i < offset+len; i+= 4096, ptr+= 4096)

    {

        struct page *page;

        page = shmem_read_mapping_page_gfp(file, i/PAGE_SIZE,0);

        if (unlikely(IS_ERR(page)))

            goto err;

        MapPage(ptr, (addr_t)page, PG_SHARED|PG_UW);

    }

    return (unsigned long)mem;

err:

    UserFree(mem);

    return -ENOMEM;

};