on MAXMEM_PFN and VMALLOC_RESERVE

Kapish K
2001-07-05T11:57:50Z

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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