low vs high memory on x86 architecture ?

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Hello list,
 
On the x86 architecture, does kernel have distinction of low-
vs high- memory from the kalloc() point of view ?
Or the whole memory is flat and equally available for kernel allocation ?
And where is boundary between low/high memory exactly, if it exists ?
 
About DMA needing only low memory ... I see dma-related slabs in /proc/slabinfo
but I do not know  whether this DMA limitation actually applies to the x86 architecture ?
Does it ?
 
Thanks
Guiseppe

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