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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