* some question about arch/x86/kernel/head_64.S
@ 2015-12-30 10:45 xiaoqiang zhao
[not found] ` <20151230113540.GA21821@kmu-tp-x230>
0 siblings, 1 reply; 4+ messages in thread
From: xiaoqiang zhao @ 2015-12-30 10:45 UTC (permalink / raw)
To: kernelnewbies
Hello:
After kernel is decompressed, the kernel will execute startup_64 and
the first two instructions are:
leaq _text(%rip), %rbp
subq $_text - __START_KERNEL_map, %rbp
I tried to understand them but can not figure out what rbp contains
after this two instructions. Anybody give me a clear explanation?
Thanks a lot!
^ permalink raw reply [flat|nested] 4+ messages in thread[parent not found: <20151230113540.GA21821@kmu-tp-x230>]
* 回复：Re: some question about arch/x86/kernel/head_64.S [not found] ` <20151230113540.GA21821@kmu-tp-x230> @ 2015-12-30 12:04 ` hitmoon 2015-12-30 12:25 ` Mike Krinkin 2015-12-30 21:12 ` 回复：Re: " hitmoon 0 siblings, 2 replies; 4+ messages in thread From: hitmoon @ 2015-12-30 12:04 UTC (permalink / raw) To: kernelnewbies An HTML attachment was scrubbed... URL: http://lists.kernelnewbies.org/pipermail/kernelnewbies/attachments/20151230/a8a4db63/attachment.html ^ permalink raw reply [flat|nested] 4+ messages in thread
* 回复：Re: some question about arch/x86/kernel/head_64.S 2015-12-30 12:04 ` 回复：Re: " hitmoon @ 2015-12-30 12:25 ` Mike Krinkin 2015-12-30 21:12 ` 回复：Re: " hitmoon 1 sibling, 0 replies; 4+ messages in thread From: Mike Krinkin @ 2015-12-30 12:25 UTC (permalink / raw) To: kernelnewbies On Wed, Dec 30, 2015 at 08:04:19PM +0800, hitmoon wrote: > Thank you mike! > so ?after the first instruction ?rbp contains the offset of actually loaded > address, which equals the physical address. yes, comment above says that at that point "someone has loaded an identity mapped page table", so it should be equal to the physical address. > $_text - __START_KERNEL_map contains the expected physical address . > Right ? yes, as far as i can tell. ^ permalink raw reply [flat|nested] 4+ messages in thread
* 回复：Re: 回复：Re: some question about arch/x86/kernel/head_64.S 2015-12-30 12:04 ` 回复：Re: " hitmoon 2015-12-30 12:25 ` Mike Krinkin @ 2015-12-30 21:12 ` hitmoon 1 sibling, 0 replies; 4+ messages in thread From: hitmoon @ 2015-12-30 21:12 UTC (permalink / raw) To: kernelnewbies An HTML attachment was scrubbed... URL: http://lists.kernelnewbies.org/pipermail/kernelnewbies/attachments/20151231/781db42e/attachment.html ^ permalink raw reply [flat|nested] 4+ messages in thread
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2015-12-30 10:45 some question about arch/x86/kernel/head_64.S xiaoqiang zhao
[not found] ` <20151230113540.GA21821@kmu-tp-x230>
2015-12-30 12:04 ` 回复：Re: " hitmoon
2015-12-30 12:25 ` Mike Krinkin
2015-12-30 21:12 ` 回复：Re: " hitmoon
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