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For platforms with multi-threaded CPUs, the number of power domains
supported would be more than the value currently defined by
PLAT_MAX_PWR_LVL. So move the PLAT_MAX_PWR_LVL macro to platform
specific code and let the platform define the number of power domain
levels.

Change-Id: I21c0682e62b397860b2999031a0c9c5ce0d28eed
Signed-off-by: Chandni Cherukuri <chandni.cherukuri@arm.com>

The CSS_SYSTEM_PWR_DMN_LVL macro that defines the system power domain
level is fixed at ARM_PWR_LVL2 for all CSS platforms. However, the
system power domain level can be different for CSS platforms that
use multi-threaded CPUs.

So, in preparation towards adding support for platforms that use
multi-threaded CPUs, refactor the definition of CSS_SYSTEM_PWR_DMN_LVL
such that CSS_SYSTEM_PWR_DMN_LVL is uniquely defined for each of the
CSS platform.

Change-Id: Ia837b13f6865e71da01780993c048b45b7f36d85
Signed-off-by: Chandni Cherukuri <chandni.cherukuri@arm.com>

Remove the platform common plat_arm_security_setup function to allow
platform specific implementations of the security setup function
implemented in the board directory of the platform.

For use by secure software, configure region0 of DMC-620 trustzone
controller to protect the upper 16MB of memory of the first DRAM block
from non-secure accesses.

Change-Id: I9a8c19656702c4fa4f6917b3655b692d443bb568
Signed-off-by: Vijayenthiran Subramaniam <vijayenthiran.subramaniam@arm.com>

In preparation of adding support for upcoming SGI platforms, macros
common to all the SGI platforms are moved into sgi_base_platform_def.h
file. Macros that are specific to sgi575 platform remain in the
platform_def.h file. In addition to this, the platform_def.h file is
moved to sgi575 board directory. Also the ENT_CPU_SOURCES has been
renamed to SGI_CPU_SOURCES and moved from sgi-common.mk to board
specific makefile platform.mk

Change-Id: Iccdd9f070f4feea232b9fbf4fdcc0ef2e8eccbf2
Signed-off-by: Chandni Cherukuri <chandni.cherukuri@arm.com>