[edk2-devel] edk2 memory map on QEMU
Andrew Fish via groups.io
afish=apple.com at groups.io
Fri Jul 30 20:36:38 UTC 2021
> On Jul 30, 2021, at 12:32 PM, Stuart Yoder <stuart.yoder at arm.com> wrote:
>
> I am playing around with EDK2 on QEMU with a UEFI shell application and in the app I allocate some memory using gBS->AllocatePool(EfiBootServicesData, ...)
>
> Programmatically accessing the pointer returned works fine, but when I print it, it does not seem to be what I would expect is a valid address.
>
> I've allocated 4GB to the QEMU machine, which I believe starts at 0x40000000.
>
You can run the `memmap` command at the EFI Shell to see the layout.
> But, when I print the address returned by AllocatePool the value is "0x39177018".
>
Print != printf on some of the format string so be careful about that….
Thanks,
Andrew Fish
> I thought that all memory was identity mapped where phys=virt, so not sure where the 0x39177018 is coming from. Trying to dump 0x39177018 from the QEMU console or GDB results in a bad address error.
> Thanks,
> Stuart
>
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