> -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Takao Indoh > Sent: 2006年9月7日 9:19 > To: Zou, Nanhai > Cc: Takao Indoh; Keith Owens; [email protected]; > [email protected] > Subject: Re: [Fastboot] [PATCH]IA64 kexec/kdump patch for INIT > > On Thu, 7 Sep 2006 08:57:13 +0800, "Zou, Nanhai" wrote: > > >> On Wed, 06 Sep 2006 18:06:53 +0900, Takao Indoh wrote: > >> > >> >>>+ /* change region of gp to region5 */ > >> >>>+ asm volatile ("movl gp=__gp"::: "memory"); > >> >> > >> >>Why? gp is already pointing at the kernel code before we enter > >> >>ia64_init_handler(). > >> > > >> >The purpose of this code is just changing region of gp from region7 to > >> >region5. For example, if gp is e000000004ace170, I want to change gp to > >> ~~~~~~~~~~~~~~~~e000000000ace170 > >> Sorry, I mistook address... > >> > >> > >> Regards, > >> Takao Indoh > >> > > You don't need to set gp here. Control page does not use GP, and > >purgatory code will set GP to a physical address which was pre-calculated > >at the time of crash kernel loading. > > If gp points region7, panic occurs at kdump_disable_iosapic. > > kdump_disable_iosapic(void) > { > u32 low32; > struct iosapic_intr_info *info; > struct iosapic_rte_info *rte; > for (info = iosapic_intr_info; info < > iosapic_intr_info + IA64_NUM_VECTORS; ++info) { > low32 = info->low32 |= IOSAPIC_MASK; > list_for_each_entry(rte, &info->rtes, > rte_list) { > (snip) > > The panic occurs at list_for_each_entry. When I found this problem, > &info->rtes and rte->rte_list pointed same data but they had different > address. > > &info->rtes => 0xe0000000049231e0 > rte->rte_list => 0xa0000001009231e0 > > info->rtes points region7 because its address is calculated from gp. > This difference of address caused panic. > > Regards, > Takao Indoh >
Ok, ia64_setreg should be better. We should avoid put inline asm code in C file. Thanks Zou Nan hai > - > To unsubscribe from this list: send the line "unsubscribe linux-ia64" in > the body of a message to [EMAIL PROTECTED] > More majordomo info at http://vger.kernel.org/majordomo-info.html
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