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Re: [PATCH v2 0/6] Add initial support for booting x86_64 from grub


From: Luca
Subject: Re: [PATCH v2 0/6] Add initial support for booting x86_64 from grub
Date: Sun, 28 Aug 2022 09:54:43 +0200

Il 27 agosto 2022 20:02:40 UTC, Samuel Thibault <samuel.thibault@gnu.org> ha scritto:
Samuel Thibault, le sam. 27 août 2022 21:41:57 +0200, a ecrit:
Mmm, on the set_cr3() in i386at_init call, it reboots...

Ah, reducing the memory size to 2G fixed it. The kernel_pmap->l4base
address was at 0xFFFD3000, apparently that was going up the roof :)
It'd be useful to test with larger memory sizes, since that's one of the
points of going 64bit ;)

Yes that is still a limitation, I forgot to add it to the commit description. I think the simplest way to solve it would be to link to the upper 2G and enhance pmap to handle L4 tables, but I was trying to have something running until a shell prompt first :)

On 64 bit we could also remove the direct mapping of all the phisical pages, right? IIRC it's needed only by the linux drivers.

Luca



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