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arch/arm: add Armv9-A and the Neoverse N2 core

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This commit adds the Neoverse N2 core, which is an implementation of
the armv9.0a ISA. See: [1] [2].

This CPU support was added in GCC 11. See [3].

The Neoverse N2 CPU is included in the Arm sbsa-ref platform in Qemu.
The Armv9.0-A Buildroot support will be needed to update those SBSA
related components. See the note in commit log [4].

This commit introduces the BR2_ARM_CPU_ARMV9A Kconfig symbol, which just
selects BR2_ARM_CPU_ARMV8A. This is because Armv9.0-A is a superset of
Armv8.5-A. This symbol can help package recipes to detect this new base
architecture.

Neoverse-N2 support has been added in QEmu in commit [5], first
included in v8.2.0.

This CPU supports Aarch32 only in EL0 (user-space). This means it's
technically possible to compile Aarch32 code targeting it. GCC has
the support to do so. Since Buildroot recompiles a full system (ATF,
Kernel, user-space) this support has limited value. This is why this
CPU is limited to 64bit builds only.

[1] https://developer.arm.com/Processors/Neoverse%20N2
[2] https://developer.arm.com/documentation/102099/0003/The-Neoverse-N2--core/Neoverse-N2--core-features
[3] https://gcc.gnu.org/gcc-11/changes.html
[4] c58a2a9687
[5] dfff1000fe

Signed-off-by: Julien Olivain <ju.o@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
This commit is contained in:
Julien Olivain
2024-11-24 22:30:30 +01:00
committed by Thomas Petazzoni
parent 824c660c75
commit 9845bd4541
1 changed files with 18 additions and 0 deletions
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18
arch/Config.in.arm
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@@ -95,6 +95,14 @@ config BR2_ARM_CPU_ARMV8A
bool
select BR2_USE_MMU
# Armv9.0-A base specification is a super-set of Armv8.5-A. It is
# fully compatible with Armv8. This symbol is defined to allow checks
# for doing Armv9 optimization. Armv8 is also selected for
# compatibility.
config BR2_ARM_CPU_ARMV9A
bool
select BR2_ARM_CPU_ARMV8A
choice
prompt "Target Architecture Variant"
default BR2_cortex_a53 if BR2_ARCH_IS_64
@@ -496,6 +504,14 @@ config BR2_saphira
select BR2_ARM_CPU_HAS_FP_ARMV8
select BR2_ARM_CPU_ARMV8A
select BR2_ARCH_NEEDS_GCC_AT_LEAST_8
comment "armv9.0a cores"
config BR2_neoverse_n2
bool "neoverse-N2 (aka perseus)"
depends on BR2_ARCH_IS_64
select BR2_ARM_CPU_HAS_FP_ARMV8
select BR2_ARM_CPU_ARMV9A
select BR2_ARCH_NEEDS_GCC_AT_LEAST_11
endchoice
config BR2_ARM_ENABLE_NEON
@@ -889,6 +905,8 @@ config BR2_GCC_TARGET_CPU
default "tsv110" if BR2_tsv110
# armv8.4a
default "saphira" if BR2_saphira
# armv9.0a
default "neoverse-n2" if BR2_neoverse_n2
config BR2_GCC_TARGET_ABI
default "aapcs-linux" if BR2_arm || BR2_armeb