refactor(neoverse-rd): move away from nrd_base_platform_def.h

The nrd_base_platform_def.h file includes CSS, RoS, firmware and
platform port related definitions. This approach of consolidating the
v

refactor(neoverse-rd): move away from nrd_base_platform_def.h

The nrd_base_platform_def.h file includes CSS, RoS, firmware and
platform port related definitions. This approach of consolidating the
various definitions for multiple generation of platforms into the
nrd_base_platform_def.h file is not scaling well.

So in preparation of moving away from the use of nrd_base_platform_def.h
file for first generation of reference design platforms (A75/N1/V1),
split the definitions in this file into multiple include files. The new
files into which the definitions are refactored are -

- nrd_css_def1.h: includes CSS hardware related definitions
- nrd_css_fw_def1.h: includes CSS firmware related definitions
- nrd_ros_fw_def1.h: includes RoS firmware related definitions
- nrd_plat_arm_def1.h: includes platform port related definitions

RoS (Rest Of System) is used to refer to the part of the reference
design platform that excludes CSS.

The definitions that are only relavant to the first generation of
reference design platforms have been refactored from the
nrd_base_platform_def.h file.

Signed-off-by: Rohit Mathew <rohit.mathew@arm.com>
Change-Id: Ie730d913235221488c385f9ddf1da46a2b760816

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refactor(neoverse-rd): remove inclusion of nrd_base_platform_def.h

The platform_def.h file includes the nrd_base_platform_def.h file in its
hierarchy of file inclusions. So the source files that inc

refactor(neoverse-rd): remove inclusion of nrd_base_platform_def.h

The platform_def.h file includes the nrd_base_platform_def.h file in its
hierarchy of file inclusions. So the source files that include
platform_def.h file do not have to include the nrd_base_platform_def.h
file. So remove such explicit inclusion of nrd_base_platform_def.h from
the source files. The scope of this change is limited to only the first
generation of the reference design platforms, that is, the A75, N1 and
V1 based platforms.

Signed-off-by: Rohit Mathew <rohit.mathew@arm.com>
Change-Id: I088b9f0ccfd9f94b5bb3c8ed91c23e8994484c7c

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refactor(neoverse-rd): header files for first generation platforms

Presently, platforms such as SGI-575, RD-N1-Edge single and dual chip,
RD_V1 single and multi-chip utilize nrd_soc_platform_def.h a

refactor(neoverse-rd): header files for first generation platforms

Presently, platforms such as SGI-575, RD-N1-Edge single and dual chip,
RD_V1 single and multi-chip utilize nrd_soc_platform_def.h and
nrd_soc_css_def.h for all css and soc-related defines. So move these
two header files into a new directory named 'nrd1'. This new directory
will serve as the container of header files that are specific to
SGI-575, RD-N1 and RD-V1 platform and its variants.

Signed-off-by: Rohit Mathew <rohit.mathew@arm.com>
Change-Id: I9d70659c6f5000ad6c1cfc0738f9e81f03238f5f

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refactor(cm): couple el2 registers with dependent feature flags

Currently the EL2 part of the context structure (el2_sysregs_t), is
mostly feature dependent.

For instance, CTX_HCRX_EL2 is only need

refactor(cm): couple el2 registers with dependent feature flags

Currently the EL2 part of the context structure (el2_sysregs_t), is
mostly feature dependent.

For instance, CTX_HCRX_EL2 is only needed when FEAT_HCX
(ENABLE_FEAT_HCX=1) is set, but the entry is unconditionally added
in the EL2 context structure and thereby consuming memory even in
build configurations where FEAT_HCX is disabled.

Henceforth, all such context entries should be coupled/tied with
their respective feature enables and be optimized away when unused.
This would reduce the context memory allocation for platforms, that
dont enable/support all the architectural features at once.

Further, converting the assembly context-offset entries into
a c structure relies on garbage collection of the linker
removing unreferenced structures from memory, as well as aiding
in readability and future maintenance.

Change-Id: I0cf49498ee3033cb6f3ee3810331121b26627783
Signed-off-by: Jayanth Dodderi Chidanand <jayanthdodderi.chidanand@arm.com>

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refactor(sgi): replace references to "SGI"/"sgi" for neoverse_rd

Currently, there are several reference to "SGI" or "sgi" in comments or
as macro prefix within the neoverse_rd directory. As part of

refactor(sgi): replace references to "SGI"/"sgi" for neoverse_rd

Currently, there are several reference to "SGI" or "sgi" in comments or
as macro prefix within the neoverse_rd directory. As part of the
migration to neoverse_rd, rename all occurences of "SGI/sgi" to
"Neoverse-RD" or the "NRD" prefix accordingly. All references in
comments are rephrased as "Neoverse RD platforms". References in code
are renamed as "NRD"/"nrd" accordingly.

Signed-off-by: Rohit Mathew <Rohit.Mathew@arm.com>
Change-Id: Iec195427ff2bee565cb4a325a1a22892be95ae16

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refactor(sgi): rename "CSS_SGI"" macro prefixes to "NRD"

As of now, several internal macros utilize "CSS_SGI" as their prefix.
Given the change to neoverse_rd, and the subsequent migration out of th

refactor(sgi): rename "CSS_SGI"" macro prefixes to "NRD"

As of now, several internal macros utilize "CSS_SGI" as their prefix.
Given the change to neoverse_rd, and the subsequent migration out of the
css directory, the prefix "CSS_SGI" is no longer appropriate.
Therefore, update the macro prefixes to "NRD" for consistency and
clarity.

Signed-off-by: Rohit Mathew <Rohit.Mathew@arm.com>
Change-Id: I3d1a9dba3e83f6e107379fc5bcf8256cc93d8c3d

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refactor(sgi): move apis and types to "nrd" prefix

Currently, functions and types internal to "neoverse_rd" platforms are
named with "sgi" as the prefix. Since common code and platforms are no
longe

refactor(sgi): move apis and types to "nrd" prefix

Currently, functions and types internal to "neoverse_rd" platforms are
named with "sgi" as the prefix. Since common code and platforms are no
longer under the "sgi" umbrella, move the prefix to "nrd". This change
would amend the prefixes for functions, types and objects.

Signed-off-by: Rohit Mathew <Rohit.Mathew@arm.com>
Change-Id: I706a82bddf55c3be7cf9cef9aaa5df6d420098ca

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refactor(sgi): replace build-option prefix to "NRD"

As of now, CSS_SGI_PLATFORM_VARIANT and CSS_SGI_CHIP_COUNT are the
external build option that "sgi" platforms support. As "sgi" has been
renamed t

refactor(sgi): replace build-option prefix to "NRD"

As of now, CSS_SGI_PLATFORM_VARIANT and CSS_SGI_CHIP_COUNT are the
external build option that "sgi" platforms support. As "sgi" has been
renamed to "neoverse_rd" and the source files have been migrated out of
the css directory, replace the prefix "CSS_SGI" with "NRD".

Signed-off-by: Rohit Mathew <Rohit.Mathew@arm.com>
Change-Id: I27989ff42404d823dd2a8cd22ff485497ccb62d4

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refactor(sgi): move neoverse_rd out of css

Currently, neoverse_rd is hosted under the "css" directory. However,
"css" directory is more relevant for hosting css definitions and
corresponding sources

refactor(sgi): move neoverse_rd out of css

Currently, neoverse_rd is hosted under the "css" directory. However,
"css" directory is more relevant for hosting css definitions and
corresponding sources. Since neoverse_rd hosts source and header for css
and soc, move neoverse_rd from css to board folder. Consolidate common
sources and headers under neoverse_rd/common. Additionally, group RD-V1,
RD-V1-MC, RD-N2, RD-N1-Edgex2 and SGI-575 within neoverse_rd/platform.
With the changes in this commit, the tree view would look as follows:

plat/arm/board/neoverse_rd/
├── common
│   ├── arch
│   ├── include
│   └── ras
└── platform
├── rdn1edge
├── rdn2
├── rdv1
├── rdv1mc
└── sgi575

Signed-off-by: Rohit Mathew <Rohit.Mathew@arm.com>
Change-Id: Iaccc86bc9d415f5c045c834902241fcf3c00277b

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