ARC: Add support for ARC HS family of CPU cores

The ARC HS is a family of high performance CPUs from Synopsys
capable of running wide range of applications from heavy DPS
calculation to full-scale OS.

Still as with other ARC cores ARC HS might be tailored to
a particular application.

As opposed to EM cores ARC HS cores always have support of unaligned
data access and by default GCC generates such a data layout with
so we have to always enable unaligned data access in runtime otherwise
on attempt to access such data we'd see "Unaligned memory exception".

Note we had to explicitly mention CONFIG_CPU_ARCEM=y in
all current defconfigs as CPU_ARC{EM|HS} are now parts of a
choice so we cannot simply select ether option in board's Kconfig.

And while at it change "-mmpy-option" of ARC EM to "wlh1"
which is the same as previously used "6" but matches
Programmer's Reference Manual (PRM) and is more human-friendly.

Signed-off-by: Wayne Ren <wei.ren@synopsys.com>
Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>

arch/arc/Kconfig

@@ -12,17 +12,25 @@ menu "ARC Options"
 config ARCH
 	default "arc"
 
-menu "ARC processor options"
+choice
+	prompt "ARC core family"
+	default CPU_ARCEM
 
 config	CPU_ARCEM
-	bool
-	default y
+	bool "ARC EM cores"
 	select CPU_ARCV2
 	select ATOMIC_OPERATIONS_C
 	help
 	  This option signifies the use of an ARC EM CPU
 
-endmenu
+config	CPU_ARCHS
+	bool "ARC HS cores"
+	select CPU_ARCV2
+	select ATOMIC_OPERATIONS_BUILTIN
+	help
+	  This option signifies the use of an ARC HS CPU
+
+endchoice
 
 menu "ARCv2 Family Options"
 
@@ -119,7 +127,8 @@ config	ARC_STACK_PROTECTION
 config	ARC_USE_UNALIGNED_MEM_ACCESS
 	bool "Enable unaligned access in HW"
 	default n if CPU_ARCEM
-	depends on (CPU_ARCEM && !ARC_HAS_SECURE)
+	default y if CPU_ARCHS
+	depends on (CPU_ARCEM && !ARC_HAS_SECURE) || CPU_ARCHS
 	help
 	  ARC EM cores w/o secure shield 2+2 mode support might be configured
 	  to support unaligned memory access which is then disabled by default.

boards/arc/em_starterkit/Kconfig.defconfig

@@ -5,9 +5,6 @@ if BOARD_EM_STARTERKIT
 config BOARD
 	default "em_starterkit"
 
-config CPU_ARCEM
-	default y
-
 if GPIO
 
 config GPIO_DW

boards/arc/em_starterkit/em_starterkit_defconfig

@@ -1,6 +1,7 @@
 # SPDX-License-Identifier: Apache-2.0
 
 CONFIG_ARC=y
+CONFIG_CPU_ARCEM=y
 CONFIG_SOC_EMSK=y
 CONFIG_SOC_EMSK_EM9D=y
 CONFIG_BOARD_EM_STARTERKIT=y

boards/arc/em_starterkit/em_starterkit_em11d_defconfig

@@ -1,6 +1,7 @@
 # SPDX-License-Identifier: Apache-2.0
 
 CONFIG_ARC=y
+CONFIG_CPU_ARCEM=y
 CONFIG_SOC_EMSK=y
 CONFIG_SOC_EMSK_EM11D=y
 CONFIG_BOARD_EM_STARTERKIT=y

boards/arc/em_starterkit/em_starterkit_em7d_defconfig

@@ -1,6 +1,7 @@
 # SPDX-License-Identifier: Apache-2.0
 
 CONFIG_ARC=y
+CONFIG_CPU_ARCEM=y
 CONFIG_SOC_EMSK=y
 CONFIG_SOC_EMSK_EM7D=y
 CONFIG_BOARD_EM_STARTERKIT=y

boards/arc/em_starterkit/em_starterkit_em7d_v22_defconfig

@@ -1,6 +1,7 @@
 # SPDX-License-Identifier: Apache-2.0
 
 CONFIG_ARC=y
+CONFIG_CPU_ARCEM=y
 CONFIG_SOC_EMSK=y
 CONFIG_SOC_EMSK_EM7D=y
 CONFIG_BOARD_EM_STARTERKIT=y

boards/arc/iotdk/Kconfig.defconfig

@@ -5,7 +5,4 @@ if BOARD_IOTDK
 config BOARD
 	default "iotdk"
 
-config CPU_ARCEM
-	default y
-
 endif # BOARD_IOTDK

boards/arc/iotdk/iotdk_defconfig

@@ -1,6 +1,7 @@
 # SPDX-License-Identifier: Apache-2.0
 
 CONFIG_ARC=y
+CONFIG_CPU_ARCEM=y
 CONFIG_SOC_ARC_IOT=y
 CONFIG_BOARD_IOTDK=y
 CONFIG_XIP=n

cmake/gcc-m-cpu.cmake

@@ -32,5 +32,7 @@ elseif("${ARCH}" STREQUAL "arc")
     set(GCC_M_CPU em4_dmips)
   elseif(CONFIG_CPU_EM4_FPUDA)
     set(GCC_M_CPU em4_fpuda)
+  elseif(CONFIG_CPU_ARCHS)
+    set(GCC_M_CPU hs)
   endif()
 endif()

soc/arc/snps_nsim/CMakeLists.txt

@@ -1,5 +1,7 @@
 # SPDX-License-Identifier: Apache-2.0
-zephyr_compile_options(-mcpu=${GCC_M_CPU} -mno-sdata -mmpy-option=6)
+zephyr_compile_options(-mcpu=${GCC_M_CPU} -mno-sdata)
+zephyr_compile_options_ifdef(CONFIG_CPU_ARCEM -mmpy-option=wlh1)
+zephyr_compile_options_ifdef(CONFIG_CPU_ARCHS -mmpy-option=plus_qmacw)
 zephyr_compile_options_ifdef(CONFIG_FLOAT -mfpu=fpuda_all)
 
 zephyr_sources(