* Currently, EL1 context is included in cpu_context_t by default
for all the build configurations.
As part of the cpu context structure, we hold a copy of EL1, EL2
system registers, per world per PE. This context structure is
enormous and will continue to grow bigger with the addition of
new features incorporating new registers.
* Ideally, EL3 should save and restore the system registers at its next
lower exception level, which is EL2 in majority of the configurations.
* This patch aims at optimising the memory allocation in cases, when
the members from the context structure are unused. So el1 system
register context must be omitted when lower EL is always x-EL2.
* "CTX_INCLUDE_EL2_REGS" is the internal build flag which gets set,
when SPD=spmd and SPMD_SPM_AT_SEL2=1 or ENABLE_RME=1.
It indicates, the system registers at EL2 are context switched for
the respective build configuration. Here, there is no need to save
and restore EL1 system registers, while x-EL2 is enabled.
Henceforth, this patch addresses this issue, by taking out the EL1
context at all possible places, while EL2 (CTX_INCLUDE_EL2_REGS) is
enabled, there by saving memory.
Change-Id: Ifddc497d3c810e22a15b1c227a731bcc133c2f4a
Signed-off-by: Jayanth Dodderi Chidanand <jayanthdodderi.chidanand@arm.com>
Jayanth Dodderi Chidanand
a0674ab081