how to convert a virutal address to physical address in Solaris driver

Solaris中DMA地址转换

最新推荐文章于 2025-11-25 14:28:51 发布

原创最新推荐文章于 2025-11-25 14:28:51 发布 · 741 阅读

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文章标签：

#solaris #warnings #interface #layer #list

本文介绍了在Solaris操作系统中如何正确使用设备驱动程序进行虚拟地址到物理地址的转换。文章强调了避免直接使用底层平台API的重要性，并推荐使用DDI DMA接口来实现这一功能。

Below discussion posted in osol-code mailing list tells how to use ddi interface to convert virtual address to physical address in Solaris driver.

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If you are writing a device driver, or porting one, then you're going about this entirely the wrong way. These APIs should only be used by low level platform code, not from within device drivers. In fact, hat_getkpfnum generates warnings if you use it!

Assuming that this is an ordinary device driver, and not something really unusual (really unusual would mean something like a new MMU layer or somesuch), then you need to use the Solaris DDI DMA interfaces.

ddi_dma_alloc_handle() to get a handle.
ddi_dma_mem_alloc() to allocate memory (unless you already have memory).
ddi_dma_addr_bind_handle() to bind DMA addresses, and get the "cookie" for the corresponding physical address.
ddi_dma_buf_bind_handle() if you're working buf(9S) structures instead of arbitrary memory

This may sound like more work, but the end result is portable and safe, and will even work on amd64 and SPARC systems.

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