Re: How does ioremap() get non-cached mappings

[Brian Gerst]

Nagendra Singh Tomar wrote:
> ioremap() function in x86 arch code does not seem to be setting _PAGE_PCD 
> bit in the PTE. How then does it give non-cached mapping to MMIO mappings 
> for memory on some interface card. I have gone thru some old threads on 
> this, which have concluded that it does give non-cached mappings, and 
> moerover ioremap seems to work fine whenever I have used to map any PCI 
> card memory,
> Is it guaranteed thru the means of MTRR ?

ioremap_nocache()

--
				Brian Gerst
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