config: add arm64-specific configs

Add a few arm64-specific configs and classify them into seven new categories
, that is,
1. base architecture-dependent options(base.conf)
It also includes varient-specific features, like CONFIG_ARM64_PMEM is
one ARMv8.2 arichitectural features.
2. crypto-related options(crypto.conf)
ARMv8 adds cryptographic instructions that could significantly improve
performance on tasks such as AES encryption and SHA1 and SHA256 hashing.
3. device tree related options(dt.conf)
The "Open Firmware Device Tree", or simply Device Tree (DT), is a data
structure and language for describing hardware, which is commonly
used in arm architecture.
4. ARM errata workarounds options(errata.conf)
There are many Kconfig entires under "Kernel Features" ->
"ARM errata workarounds via the alternatives framework", which provides
software workarounds to mitigate systems affected by those erratum.
Vendor-specific option will be left to users to decide.
5. pci related options(pci.conf)
a simplified pci host controller for mach-virt.
6. serial devices options(serial.conf)
CONFIG_SERIAL_OF_PLATFORM is used for all 8250 compatible serial ports
that are probed through device tree.
7. rtc related options(rtc.conf)
we don't have KVM’s paravirtualized clock and ptp implementation is
still under experimental mode, so we need rtc on aarch64.
QEMU provides an emulated ARM AMBA PrimeCell PL031 RTC.

Fixes: #1004

Signed-off-by: Penny Zheng <penny.zheng@arm.com>

kernel/configs/fragments/arm64/base.conf

@@ -0,0 +1,42 @@
+CONFIG_ARM64=y
+CONFIG_ARM64_4K_PAGES=y
+
+# ARM servers are often multi-cores, following configs improve
+# the CPU scheduler's decision making.
+CONFIG_SCHED_MC=y
+CONFIG_SCHED_SMT=y
+
+# Virtual address space size (48-bit)
+CONFIG_ARM64_VA_BITS_48=y
+CONFIG_ARM64_VA_BITS=48
+# Physical address space size (48-bit)
+CONFIG_ARM64_PA_BITS_48=y
+CONFIG_ARM64_PA_BITS=48
+
+# Use the maximum number of CPUs supported by KVM (255)
+CONFIG_NR_CPUS=255
+
+CONFIG_PERF_EVENTS=y
+
+# No architected NMI
+CONFIG_ARM64_PSEUDO_NMI=y
+CONFIG_ARM64_SVE=y
+
+# Arm64 prefers to use REFCOUNT_FULL by default.
+CONFIG_REFCOUNT_FULL=y
+
+#
+# ARMv8.1 architectural features
+#
+CONFIG_ARM64_HW_AFDBM=y
+CONFIG_ARM64_PAN=y
+# end of ARMv8.1 architectural features
+
+#
+# ARMv8.2 architectural features
+#
+CONFIG_ARM64_CNP=y
+CONFIG_ARM64_PMEM=y
+CONFIG_ARM64_RAS_EXTN=y
+CONFIG_ARM64_UAO=y
+# end of ARMv8.2 architectural feature

kernel/configs/fragments/arm64/crypto.conf

@@ -0,0 +1,6 @@
+# ARMv8 adds cryptographic instructions that could significantly improve
+# performance on tasks such as AES encryption and SHA1 and SHA256 hashing.
+CONFIG_ARM64_CRYPTO=y
+CONFIG_CRYPTO_AES_ARM64=y
+CONFIG_CRYPTO_AES_ARM64_CE=y
+CONFIG_CRYPTO_SHA256_ARM64=y

kernel/configs/fragments/arm64/dt.conf

@@ -0,0 +1,4 @@
+# Device Tree and Open Firmware support
+CONFIG_DTC=y
+CONFIG_OF=y
+CONFIG_OF_PMEM=y

kernel/configs/fragments/arm64/erratum.conf

@@ -0,0 +1,15 @@
+# ARM errata workarounds via the alternatives framework.
+# Vendor-specific option will be left to users to decide.
+CONFIG_ARM64_ERRATUM_1024718=y
+CONFIG_ARM64_ERRATUM_1165522=y
+CONFIG_ARM64_ERRATUM_1286807=y
+CONFIG_ARM64_ERRATUM_1463225=y
+CONFIG_ARM64_ERRATUM_819472=y
+CONFIG_ARM64_ERRATUM_824069=y
+CONFIG_ARM64_ERRATUM_826319=y
+CONFIG_ARM64_ERRATUM_827319=y
+CONFIG_ARM64_ERRATUM_832075=y
+CONFIG_ARM64_ERRATUM_843419=y
+CONFIG_ARM64_WORKAROUND_CLEAN_CACHE=y
+CONFIG_ARM64_WORKAROUND_REPEAT_TLBI=y
+

kernel/configs/fragments/arm64/pci.conf

@@ -0,0 +1,3 @@
+# It brings PCI support to mach-virt based upon an idealised host controller.
+CONFIG_PCI_HOST_COMMON=y
+CONFIG_PCI_HOST_GENERIC=y

kernel/configs/fragments/arm64/rtc.conf

@@ -0,0 +1,10 @@
+CONFIG_RTC_LIB=y
+CONFIG_RTC_CLASS=y
+CONFIG_RTC_HCTOSYS=y
+CONFIG_RTC_SYSTOHC=y
+# RTC interfaces
+CONFIG_RTC_INTF_SYSFS=y
+CONFIG_RTC_INTF_PROC=y
+CONFIG_RTC_INTF_DEV=y
+# QEMU provides an emulated ARM AMBA PrimeCell PL031 RTC.
+CONFIG_RTC_DRV_PL031=y

kernel/configs/fragments/arm64/serial.conf

@@ -0,0 +1,3 @@
+# This option is used for all 8250 compatible serial ports
+# that are probed through device tree.
+CONFIG_SERIAL_OF_PLATFORM=y