当PPE希望访问邮箱时，它需要能够访问内存映射的寄存器空间，后者通常只对于内核空间来说是可用的。

When the ppe wants to access the mailbox, it needs to have access to the memory-mapped register space, which is normally only available to kernel space.

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本文在简述语音采集压缩卡的硬件体系结构的基础上，重点阐述了驱动程序中多卡管理和内存映射的实现。

This paper design and implement hardware and software of voice record card, and analysis and implement multi -card management and memory map.

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包括读写文本文件的便捷方法，快速地列举目录，对内存映射文件的支持。

These include convenience methods for reading and writing text-based files, significantly faster directory enumeration, and support for memory mapped files.

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