How many bits of virtual address space has current x86-64 im

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hendric

How many bits of virtual address space has current x86-64 im

Post by hendric »

According to x86-64 manuals volume2 I found it supported up to 48 bits but implementations could implement less.As I read about the documentations of Linux on mm policy of x86-64 architecture Andi said current X86-64 implementations only support 40 bits of address space.Is it now still 40 bits?
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hendric

Re:How many bits of virtual address space has current x86-64

Post by hendric »

I've got it. AMD Athlon? 64 Processors now support full 48-bit virtual addresses.It's cool!
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paulbarker

Re:How many bits of virtual address space has current x86-64

Post by paulbarker »

'cat /proc/cpuinfo' says 40 bits physical, 48 bits virtual. I think thats standard, at least for an X2.

I'll stop showing off now.
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Candy
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Re:How many bits of virtual address space has current x86-64

Post by Candy »

hendric wrote: I've got it. AMD Athlon? 64 Processors now support full 48-bit virtual addresses.It's cool!
Read that info from the MSR's, current tests give no guarantee for the future. Make your code work by specs, not just by tests.
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