* wby mapping beyond end by "MAPPING_BEYOND_END" ?
@ 2013-03-02 7:40 Jacky
0 siblings, 0 replies; 2+ messages in thread
From: Jacky @ 2013-03-02 7:40 UTC (permalink / raw)
To: kernelnewbies
Hi All,
For x86, in arch/x86/kernel/head_32.S, for Initializing page tables,
why mapping beyond end by "MAPPING_BEYOND_END":
/*
* End condition: we must map up to the end + MAPPING_BEYOND_END.
*/
movl $pa(_end) + MAPPING_BEYOND_END + PTE_IDENT_ATTR, %ebp
cmpl %ebp,%eax
jb 10b
According vmlinux.lds.S, the paging table is between __brk_base and
_end. So why map MAPPING_BEYOND_END after _end ?
Regards,
Jacky
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* wby mapping beyond end by "MAPPING_BEYOND_END" ?
@ 2012-12-21 6:52 Wang Baisheng
0 siblings, 0 replies; 2+ messages in thread
From: Wang Baisheng @ 2012-12-21 6:52 UTC (permalink / raw)
To: linux-kernel
Hi All,
For x86, in arch/x86/kernel/head_32.S, for Initializing page tables,
why mapping beyond end by "MAPPING_BEYOND_END":
/*
* End condition: we must map up to the end + MAPPING_BEYOND_END.
*/
movl $pa(_end) + MAPPING_BEYOND_END + PTE_IDENT_ATTR, %ebp
cmpl %ebp,%eax
jb 10b
According vmlinux.lds.S, the paging table is between __brk_base and
_end. So why map MAPPING_BEYOND_END after _end ?
Regards,
Jacky
^ permalink raw reply [flat|nested] 2+ messages in thread
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