Commits on Apr 8, 2024

1. core: make OP-TEE relocatable without S-EL2 SPMC …

   This dissociates CFG_CORE_PHYS_RELOCATABLE from CFG_CORE_SEL2_SPMC,
   so that OP-TEE can be physically relocated without an SPMC at EL2.
   
   One of the possible use-cases of enabling CFG_CORE_PHYS_RELOCATABLE
   without CFG_CORE_SEL2_SPMC is physical KASLR. In particular, with this
   configuration enabled, earlier stage bootloader can load OP-TEE at
   an arbitrary 4K-aligned physical address.
   
   Unlike the case where OP-TEE is loaded at some offset by an SPMC at
   EL2 (e.g., 16KB by Hafnium) and there are some metadata to keep
   (e.g, FF-A manifest) below the physical offset, we can use the memory
   region below the physical offset as TA RAM when OP-TEE is loaded at
   some random location by earlier stage bootloader, but there's no
   SPMC at EL2.
   
   To that end, we introduce another memory pool `tee_mm_sec_ddr_extra`
   that accompanies with existing `tee_mm_sec_ddr` to provide secure-
   DDR-backed allocation, to support such spliti TA RAM scenarios.
   
   Also note that memory statistic infrastructure for TA RAM will be
   inaccurate as it doesn't take account into split TA RAM, i.e.,
   memory blocks allocated from `tee_sec_mm_ddr_extra`, as of now.
   
   Signed-off-by: Seonghyun Park <seonghp@amazon.com>

   

   seonghp committed Apr 8, 2024
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