学习remap_pfn_range的例子。 在驱动中申请一个32个Page的缓冲区,这里的PAGE_SIZE是4KB,所以内核中的缓冲区大小是128KB。user_1和user_2将前64KB映射到自 己的用户空间,其中user_1向缓冲区中写入字符串,user_2去读取。user_3和user_4将后64KB映射到自己的用户空间,其中user_3向缓冲区 中写入字符串,user_4读取字符串。user_5将整个128KB映射到自己的用户空间,然后将缓冲区清零。 此外,在驱动中申请缓冲区的方式有多种,可以用kmalloc、也可以用alloc_pages,当然也可用vmalloc,下面会分别针对这三个接口实 现驱动。
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