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Date: Thu, 15 May 2008 10:40:07 +0800 From: "Huang, Ying" <ying.huang@...el.com> To: "Eric W. Biederman" <ebiederm@...ssion.com> CC: Vivek Goyal <vgoyal@...hat.com>, Pavel Machek <pavel@....cz>, nigel@...el.suspend2.net, "Rafael J. Wysocki" <rjw@...k.pl>, Andrew Morton <akpm@...ux-foundation.org>, linux-kernel@...r.kernel.org, Kexec Mailing List <kexec@...ts.infradead.org> Subject: Re: [PATCH] kexec based hibernation: a prototype of kexec multi-stage load On Wed, 2008-05-14 at 14:43 -0700, Eric W. Biederman wrote: > "Huang, Ying" <ying.huang@...el.com> writes: > > >> So, IMHO, for first simple implementation, we don't have to pass around > >> any data between kernels except entry point. (Please correct me if I am > >> wrong). Lets get that implementation in first and then we can get rest > >> of the pieces in place. > > > > Yes. Kernel entry/re-entry point is the only information need to be > > communicated between kernels for just switching between them. So we can > > focus on kexec jump patch firstly. > > Then as a preliminary design let's plan on this. > > - Pass the rentry point as the return address (using the C ABI). > We may want to load the stack pointer etc so we can act as > a direct entry point for new code. OK, I will try to do this. > - Look at passing a pointer to the mapping of pages that the kexec > trampoline uses in arg1 of the C ABI. Largely the format is defacto > fixed anyway because we need to pass the structure from C to > assembly. You mean pass image->head to purgatory of /sbin/kexec using arg1 of C ABI? > Using the standard C ABI makes things much it much easier to pick > a calling convention, and to document it. Yes. Best Regards, Huang Ying -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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