Re: [PATCH, DEBUG] x86/32: Add small delay after resume

From: H. Peter Anvin
Date: Tue Jun 16 2015 - 17:34:21 EST

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?


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