#13528: Early bios call in bootloader cause reboot on skylake x86_64
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Reporter: kallisti5 | Owner: nobody
Type: bug | Status: new
Priority: normal | Milestone: Unscheduled
Component: System/Boot Loader | Version: R1/Development
Resolution: | Keywords:
Blocked By: | Blocking:
Has a Patch: 0 | Platform: All
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Comment (by pulkomandy):
IIRC we investigated a possibly similar issue with Ithamar on his MacBook
during some BeGeistert coding sprint. This was quite a long time ago, but
I remember we had traced it down to an usual way to handle segment:offset
addressing while calling the BIOS (yay, segmented memory!)
Basically, the BIOS expects to be called at 0800:0000, but we were calling
it at 0000:8000, which results in the same physical address (because
segments overlap) but may confuse some BIOS implementations.
There is nothing 64-bit related at this early stage of boot. This code
runs with the CPU in real mode, compatible with Intel's 286.
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Ticket URL: <https://dev.haiku-os.org/ticket/13528#comment:4>
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