From: Ard Biesheuvel <ard.biesheuvel@linaro.org>
To: Kurt Kennett <Kurt.Kennett@microsoft.com>
Cc: edk2-devel <edk2-devel@lists.01.org>
Subject: Re: Problem with Arm Mmu code in CpuDxe
Date: Wed, 21 Sep 2016 18:20:47 +0100 [thread overview]
Message-ID: <CAKv+Gu-uCgipjshBmJ8dnaJxYjMHcnp+0B8YbKBQoyZAh-HbZw@mail.gmail.com> (raw)
In-Reply-To: <BL2PR03MB433AE7DE3D7F0D64807EF659CF60@BL2PR03MB433.namprd03.prod.outlook.com>
On 21 September 2016 at 17:09, Kurt Kennett <Kurt.Kennett@microsoft.com> wrote:
> I am having a problem on my system (assert), and during investigation I may have found a problem with the Arm CpuDxe Mmu code that may affect all ARM platform users.
>
> CpuDxeInitialize is the entry point, and pretty soon after entry it does:
>
> SyncCacheConfig (&mCpu);
>
> This calls into:
> ArmPkg\Drivers\CpuDxe\Arm\Mmu.c
>
> The code asserts that the Mmu is enabled, gets the memory space map, then starts to process the page tables by getting the TTBR0 base address.
Before the assert, there is a comment that says
// This code assumes MMU is enabled and filed [sic] with section translations
I don't know if this is a reasonable thing to assume, and how you end
up violating this assumption, but it does explain why the code does
not work correctly.
What does your memory map look like?
next prev parent reply other threads:[~2016-09-21 17:20 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-21 16:09 Problem with Arm Mmu code in CpuDxe Kurt Kennett
2016-09-21 17:20 ` Ard Biesheuvel [this message]
2016-09-21 17:31 ` Kurt Kennett
2016-09-21 17:54 ` Kurt Kennett
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