[edk2-devel] edk2 memory map on QEMU
Stuart Yoder
stuart.yoder at arm.com
Fri Jul 30 21:50:23 UTC 2021
On 7/30/21 3:36 PM, Andrew Fish wrote:
>
>
>> On Jul 30, 2021, at 12:32 PM, Stuart Yoder <stuart.yoder at arm.com <mailto: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….
>
I figured it out. It was a dumb Print() formatting error that resulted in
the address getting truncated to 8 bytes.
Thanks,
Stuart
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