How does ioremap() get non-cached mappings

[Nagendra Singh Tomar]

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 ?


Thanx,
tomar


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