[Xen-devel] idle_pg_tables?

[PUCCETTI Armand <armand.puccetti@xxxxxx>]

In the paging mechanism of XEN what is the role of the variable 
'idle_pg_table'??
For a 4-levels paging it is defined as external in asm-x86/page.h, like this

extern root_pgentry_t <http://lxr.xensource.com/lxr/ident?a=x86_64;i=root_pgentry_t> 
idle_pg_table 
<http://lxr.xensource.com/lxr/ident?a=x86_64;i=idle_pg_table>[ROOT_PAGETABLE_ENTRIES 
<http://lxr.xensource.com/lxr/ident?a=x86_64;i=ROOT_PAGETABLE_ENTRIES>];
extern l2_pgentry_t <http://lxr.xensource.com/lxr/ident?a=x86_64;i=l2_pgentry_t>   
idle_pg_table_l2 
<http://lxr.xensource.com/lxr/ident?a=x86_64;i=idle_pg_table_l2>[ROOT_PAGETABLE_ENTRIES 
<http://lxr.xensource.com/lxr/ident?a=x86_64;i=ROOT_PAGETABLE_ENTRIES>];


but where is it initialised?
and why is there only such as idle table for levels 4 and 2?
thanks




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