On Tue, Jun 16, 2015 at 02:33:10PM -0700, H. Peter Anvin wrote:
> On 06/15/2015 09:10 AM, Srinivas Pandruvada wrote:
> >>
> >> So is it true that we always execute wakeup_pmode_return first after we
> >> return
> >> from the BIOS?
> >>
> >> If so then the BIOS touching DS cannot be an issue, as we re-initialize
> >> all
> >> segment selectors, which reloads the descriptors:
> >>
> >> ENTRY(wakeup_pmode_return)
> >> wakeup_pmode_return:
> >> movw $__KERNEL_DS, %ax
> >> movw %ax, %ss
> >> movw %ax, %ds
> >> movw %ax, %es
> >> movw %ax, %fs
> >> movw %ax, %gs
> >>
> >> # reload the gdt, as we need the full 32 bit address
> >> lidt saved_idt
> >> lldt saved_ldt
> >> ljmp $(__KERNEL_CS), $1f
> >>
>
> Where does the GDT get initialized?
>
> -hpa
mit 84e70971e67d97bc2db18a4e76d42846272a54bd
Author: Konrad Rzeszutek Wilk <konrad.w...@oracle.com>
Date: Fri Apr 5 16:42:22 2013 -0400
x86-32, gdt: Store/load GDT for ACPI S3 or hibernation/resume path is not
needed
>
>
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