Описание тега ioremap

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`ioremap()` maps bus memory into CPU space for memory mapped I/O in the Linux kernel

void __iomem *ioremap(unsigned long port, unsigned long size) is the function in the Linux kernel that maps bus memory into CPU space. It will perform a platform specific sequence of operations to make bus memory CPU accessible via the read{b,w,l} write{b,w,l} functions and the other memory mapped I/O helper functions. The returned address is not guaranteed to be usable directly as a virtual address.

Cache behavior through the newly established mapping could be one of but are not limited to:

  • Uncached
  • Write-back
  • Write Combining

References