on MAXMEM_PFN and VMALLOC_RESERVE

[Kapish K <kapish@ureach.com>]

Hello,
 What does this code ( in arch/i386/kernel/setup.c ), actually 
imply?
/* 
 *Determine low and high memory ranges: 
 */

max_low_pfn=max_pfn;
if ( max_low_pfn > MAXMEM_PFN ){
      max_low_pfn = MAXMEM_PFN;
#ifndef CONFIG_HIGHMEM
    /* Maximum memory usable is what is directlt addressable */
Now here, what does this imply, and the significance of 
VMALLOC_RESERVE in the MAXMEM_PFN calculations ( as in setup.c ) 
:MAXMEM_PFN PFN_DOWN(MAXMEM)
where MAXMEM = (unsigned long) ( -PAGE_OFFSET - VMALLOC_RESERVE 
)
Also, what is the significance of this in terms of physical RAM 
sizes of 128 mb or more ( even greater than 1 GB ). I assume 
that still will not be high mem.
Any hints or pointers would be welcome.
Thanks



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