[OLPC-devel] Thoughts on S3 resume.

[Matthew Garrett]

On Thu, Jul 27, 2006 at 08:29:08AM -0600, Ronald G Minnich wrote:

> do you mean protected mode or paging enabled? Linuxbios goes into 
> protected in the first 10 instructions or so. If it is an s3 restart, 
> then linuxbios can pop out to real mode and call the kernel if needed.

Right now, the Linux ACPI wakeup code expects to come back up in 16-bit 
mode with segmented memory - arch/i386/kernel/acpi/wakeup.S is what ends 
up getting run. The wakeup code gets copied into low memory on startup, 
and the address copied into the wakeup register. ACPI BIOSes then just 
jump to that address on startup. If Linuxbios is doing some of this 
setup already, I guess we can just work from there.

-- 
Matthew Garrett | mjg59 at srcf.ucam.org