Due to missing x86_64 support it's required to use PAE enabled x86_32 code. The corresponding functions can be found in src/cpu/x86/pae/
.
To clear all DRAM on request of the Security API, a helper function can be used called memset_pae
. The function has additional requirements in contrast to memset
, and has more overhead as it uses virtual memory to access memory above 4GiB. Memory is cleared in 2MiB chunks, which might take a while.
Make sure to enable caches through MTRRs, otherwise memset_pae
will be slow!