bootmem ?

["Somshekar. C. Kadam - CTD, Chennai." <som_kadam@ctd.hcltech.com>]

hi ,
 i am newbie to linux mm trying to understand bootmem allocator
struct bootmem_data
unsigned long node_boot_start what for 



void *node_bootmem_map what is this  for 

 if i am right 
           node_bootmem_map is apointer to beginig of bitmap that is the end
of kernel


   what should be the value of node_boot_start 

 i am having 32 mb ram 
 
   my kernel is loaded from 0x400 after 1mb(including text data and bss)
which is end of kernel 
 i am setting node_boot_start as the pouinter to bit map 
storing bitmap after the end of the kernel

what should be the value given to node_boot_start
whre should it be i am not clear 

 any idea pls 
thanks in advnce 

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