Re: [Xen-devel] Xen + other stuff?

[Bin Ren <br260@xxxxxxxxx>]

On 13 Nov 2003, at 21:02, Bin Ren wrote:

> To add, currently there are two modes of High Memory support:
>
> (1)4G: It uses 2 level page table entry + dynamic mapping so that
> each (Xeno)Linux instance can use anything up to 4G of physical
> memory.
>
> (2)64G: It uses 3 level PAE page table entry + dynamic mapping
> so that each (Xeno)Linux instance can use anything up to 64G
> of physical memory.
>
>
> -- Bin

FYI, you can explore address space possibilities with simple 'C' code:


#include <stdio.h>

char data;

int main()
{
  char stack;
  unsigned long avail;

  avail = 0xffffffff - (long)&stack;
  printf("Address available above stack %08lx\n", avail);
  avail = 0xffffffff - (long)&data;
  printf("Address available above data %08lx\n", avail);
  avail = 0xffffffff - (long)main;
  printf("Address available above code %08lx\n", avail);
}

-- Bin


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