arch/arc/Kconfig

# ARC options

# Copyright (c) 2014, 2019 Wind River Systems, Inc.
# SPDX-License-Identifier: Apache-2.0

menu "ARC Options"
	depends on ARC

config ARCH
	default "arc"

config CPU_ARCEM
	bool
	select ATOMIC_OPERATIONS_C
	help
	  This option signifies the use of an ARC EM CPU

config CPU_ARCHS
	bool
	select ATOMIC_OPERATIONS_BUILTIN
	select BARRIER_OPERATIONS_BUILTIN
	help
	  This option signifies the use of an ARC HS CPU


choice
	prompt "ARC Instruction Set"
	default ISA_ARCV2

config ISA_ARCV2
	bool "ARC ISA v2"
	select ARCH_HAS_STACK_PROTECTION if ARC_HAS_STACK_CHECKING || (ARC_MPU && ARC_MPU_VER !=2)
	select ARCH_HAS_USERSPACE if ARC_MPU
	select ARCH_HAS_SINGLE_THREAD_SUPPORT if !SMP
	select USE_SWITCH
	select USE_SWITCH_SUPPORTED
	help
	  v2 ISA for the ARC-HS & ARC-EM cores

config ISA_ARCV3
	bool "ARC ISA v3"
	select ARCH_HAS_SINGLE_THREAD_SUPPORT if !SMP
	select USE_SWITCH
	select USE_SWITCH_SUPPORTED

endchoice

if ISA_ARCV2

config CPU_EM4
	bool
	select CPU_ARCEM
	help
	  If y, the SoC uses an ARC EM4 CPU

config CPU_EM4_DMIPS
	bool
	select CPU_ARCEM
	help
	  If y, the SoC uses an ARC EM4 DMIPS CPU

config CPU_EM4_FPUS
	bool
	select CPU_ARCEM
	help
	  If y, the SoC uses an ARC EM4 DMIPS CPU with the single-precision
	  floating-point extension

config CPU_EM4_FPUDA
	bool
	select CPU_ARCEM
	help
	  If y, the SoC uses an ARC EM4 DMIPS CPU with single-precision
	  floating-point and double assist instructions

config CPU_EM6
	bool
	select CPU_ARCEM
	select CPU_HAS_DCACHE
	select CPU_HAS_ICACHE
	help
	  If y, the SoC uses an ARC EM6 CPU

config CPU_HS3X
	bool
	select CPU_ARCHS
	select CPU_HAS_DCACHE
	select CPU_HAS_ICACHE
	help
	  If y, the SoC uses an ARC HS3x CPU

config CPU_HS4X
	bool
	select CPU_ARCHS
	select CPU_HAS_DCACHE
	select CPU_HAS_ICACHE
	help
	  If y, the SoC uses an HS4X CPU

endif #ISA_ARCV2

if ISA_ARCV3

config CPU_HS5X
	bool
	select CPU_ARCHS
	select CPU_HAS_DCACHE
	select CPU_HAS_ICACHE
	help
	  If y, the SoC uses an ARC HS6x CPU

config CPU_HS6X
	bool
	select CPU_ARCHS
	select 64BIT
	select CPU_HAS_DCACHE
	select CPU_HAS_ICACHE
	help
	  If y, the SoC uses an ARC HS6x CPU

endif #ISA_ARCV3

config FP_FPU_DA
	bool

menu "ARC CPU Options"

config ARC_HAS_ZOL
	bool
	depends on ISA_ARCV2
	default y
	help
	  ARCv2 CPUs have ZOL hardware loop mechanism which the ARCv3 ISA drops.
	  Architecturally ZOL provides
	  - LPcc instruction
	  - LP_COUNT core reg
	  - LP_START, LP_END aux regs
	  Disabling this option removes usage of ZOL regs from code

config NUM_IRQ_PRIO_LEVELS
	int "Number of supported interrupt priority levels"
	range 1 16
	help
	  Interrupt priorities available will be 0 to NUM_IRQ_PRIO_LEVELS-1.
	  The minimum value is 1.

	  The BSP must provide a valid default for proper operation.

config NUM_IRQS
	int "Upper limit of interrupt numbers/IDs used"
	range 17 256
	help
	  Interrupts available will be 0 to NUM_IRQS-1.
	  The minimum value is 17 as the first 16 entries in the vector
	  table are for CPU exceptions.

	  The BSP must provide a valid default. This drives the size of the
	  vector table.

config RGF_NUM_BANKS
	int "Number of General Purpose Register Banks"
	depends on ARC_FIRQ
	depends on NUM_IRQ_PRIO_LEVELS > 1
	range 1 2
	default 2
	help
	  The ARC CPU can be configured to have more than one register
	  bank. If fast interrupts are supported (FIRQ), the 2nd
	  register bank, in the set, will be used by FIRQ interrupts.
	  If fast interrupts are supported but there is only 1
	  register bank, the fast interrupt handler must save
	  and restore general purpose registers.
	  NOTE: it's required to have more than one interrupt priority level
	  to use second register bank - otherwise all interrupts will use
	  same register bank. Such configuration isn't supported in software
	  and it is not beneficial from the performance point of view.

config ARC_FIRQ
	bool "FIRQ enable"
	depends on ISA_ARCV2
	depends on NUM_IRQ_PRIO_LEVELS > 1
	depends on !ARC_HAS_SECURE
	default y
	help
	  Fast interrupts are supported (FIRQ). If FIRQ enabled, for interrupts
	  with highest priority, status32 and pc will be saved in aux regs,
	  other regs will be saved according to the number of register bank;
	  If FIRQ is disabled, the handle of interrupts with highest priority
	  will be same with other interrupts.
	  NOTE: we don't allow the configuration with FIRQ enabled and only one
	  interrupt priority level (so all interrupts are FIRQ). Such
	  configuration isn't supported in software and it is not beneficial
	  from the performance point of view.

config ARC_FIRQ_STACK
	bool "Separate firq stack"
	depends on ARC_FIRQ && RGF_NUM_BANKS > 1
	help
	  Use separate stack for FIRQ handing. When the fast irq is also a direct
	  irq, this will get the minimal interrupt latency.

config ARC_FIRQ_STACK_SIZE
	int "FIRQ stack size"
	depends on ARC_FIRQ_STACK
	default 1024
	help
	  The size of firq stack.

config ARC_HAS_STACK_CHECKING
	bool "ARC has STACK_CHECKING"
	depends on ISA_ARCV2
	default y
	help
	  ARC is configured with STACK_CHECKING which is a mechanism for
	  checking stack accesses and raising an exception when a stack
	  overflow or underflow is detected.

config ARC_CONNECT
	bool "ARC has ARC connect"
	select SCHED_IPI_SUPPORTED
	help
	  ARC is configured with ARC CONNECT which is a hardware for connecting
	  multi cores.

config ARC_STACK_CHECKING
	bool
	select NO_UNUSED_STACK_INSPECTION
	help
	  Use ARC STACK_CHECKING to do stack protection

config ARC_STACK_PROTECTION
	bool
	default y if HW_STACK_PROTECTION
	select ARC_STACK_CHECKING if ARC_HAS_STACK_CHECKING
	select MPU_STACK_GUARD if (!ARC_STACK_CHECKING && ARC_MPU && ARC_MPU_VER !=2)
	select THREAD_STACK_INFO
	help
	  This option enables either:
	  - The ARC stack checking, or
	  - the MPU-based stack guard
	  to cause a system fatal error
	  if the bounds of the current process stack are overflowed.
	  The two stack guard options are mutually exclusive. The
	  selection of the ARC stack checking is
	  prioritized over the MPU-based stack guard.

config ARC_USE_UNALIGNED_MEM_ACCESS
	bool "Unaligned access in HW"
	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.
	  Enable unaligned access in hardware and make software to use it.

config ARC_CURRENT_THREAD_USE_NO_TLS
	bool
	select CURRENT_THREAD_USE_NO_TLS
	default y if (RGF_NUM_BANKS > 1) || ("$(ZEPHYR_TOOLCHAIN_VARIANT)" = "arcmwdt")
	help
	  Disable current Thread Local Storage for ARC. For cores with more then one
	  RGF_NUM_BANKS the parameter is disabled by-default because banks syncronization
	  requires significant time, and it slows down performance.
	  ARCMWDT works with tls pointer in different way then GCC. Optimized access to
	  TLS pointer via _current variable does not provide significant advantages
	  in case of MetaWare.

config GEN_ISR_TABLES
	default y

config GEN_IRQ_START_VECTOR
	default 16

config HARVARD
	bool "Harvard Architecture"
	help
	  The ARC CPU can be configured to have two busses;
	  one for instruction fetching and another that serves as a data bus.

config CODE_DENSITY
	bool "Code Density Option"
	help
	  Enable code density option to get better code density

config ARC_HAS_ACCL_REGS
	bool "Reg Pair ACCL:ACCH (FPU and/or MPY > 6 and/or DSP)"
	default y if CPU_HS3X || CPU_HS4X || CPU_HS5X || CPU_HS6X
	help
	  Depending on the configuration, CPU can contain accumulator reg-pair
	  (also referred to as r58:r59). These can also be used by gcc as GPR so
	  kernel needs to save/restore per process

config ARC_HAS_SECURE
	bool "ARC has SecureShield"
	depends on ISA_ARCV2
	select CPU_HAS_TEE
	select ARCH_HAS_TRUSTED_EXECUTION
	help
	  This option is enabled when ARC core supports secure mode

config SJLI_TABLE_SIZE
	int "SJLI table size"
	depends on ARC_SECURE_FIRMWARE
	default 8
	help
	  The size of sjli (Secure Jump and Link Indexed) table. The
	  code in normal mode call secure services in secure mode through
	  sjli instruction.

config ARC_SECURE_FIRMWARE
	bool "Generate Secure Firmware"
	depends on ARC_HAS_SECURE
	default y if TRUSTED_EXECUTION_SECURE
	help
	  This option indicates that we are building a Zephyr image that
	  is intended to execute in secure mode. The option is only
	  applicable to ARC processors that implement the SecureShield.

	  This option enables Zephyr to include code that executes in
	  secure mode, as well as to exclude code that is designed to
	  execute only in normal mode.

	  Code executing in secure mode has access to both the secure
	  and normal resources of the ARC processors.

config ARC_NORMAL_FIRMWARE
	bool "Generate Normal Firmware"
	depends on !ARC_SECURE_FIRMWARE
	depends on ARC_HAS_SECURE
	default y if TRUSTED_EXECUTION_NONSECURE
	help
	  This option indicates that we are building a Zephyr image that
	  is intended to execute in normal mode. Execution of this
	  image is triggered by secure firmware that executes in secure
	  mode. The option is only applicable to ARC processors that
	  implement the SecureShield.

	  This option enables Zephyr to include code that executes in
	  normal mode only, as well as to exclude code that is
	  designed to execute only in secure mode.

	  Code executing in normal mode has no access to secure
	  resources of the ARC processors, and, therefore, it shall avoid
	  accessing them.

config ARC_VPX_COOPERATIVE_SHARING
	bool "Cooperative sharing of ARC VPX vector registers"
	select SCHED_CPU_MASK if MP_MAX_NUM_CPUS > 1
	help
	  This option enables the cooperative sharing of the ARC VPX vector
	  registers. Threads that want to use those registers must successfully
	  call arc_vpx_lock() before using them, and call arc_vpx_unlock()
	  when done using them.

source "arch/arc/core/dsp/Kconfig"

menu "ARC MPU Options"
depends on CPU_HAS_MPU

config ARC_MPU_ENABLE
	bool "Memory Protection Unit (MPU)"
	select ARC_MPU
	help
	  Enable MPU

source "arch/arc/core/mpu/Kconfig"

endmenu

config DCACHE_LINE_SIZE
	default 32

config ARC_EXCEPTION_STACK_SIZE
	int "ARC exception handling stack size"
	default 768 if !64BIT
	default 2048 if 64BIT
	help
	  Size in bytes of exception handling stack which is at the top of
	  interrupt stack to get smaller memory footprint because exception
	  is not frequent. To reduce the impact on interrupt handling,
	  especially nested interrupt, it cannot be too large.

endmenu

config ARC_EARLY_SOC_INIT
	bool "Make early stage SoC-specific initialization"
	help
	  Call SoC per-core setup code on early stage initialization
	  (before C runtime initialization). Setup code is called in form of
	  soc_early_asm_init_percpu assembler macro.

config MAIN_STACK_SIZE
	default 4096 if 64BIT

config ISR_STACK_SIZE
	default 4096 if 64BIT

config SYSTEM_WORKQUEUE_STACK_SIZE
	default 4096 if 64BIT

config IDLE_STACK_SIZE
	default 1024 if 64BIT

config IPM_CONSOLE_STACK_SIZE
	default 2048 if 64BIT

config TEST_EXTRA_STACK_SIZE
	default 2048 if 64BIT

config CMSIS_THREAD_MAX_STACK_SIZE
	default 2048 if 64BIT

config CMSIS_V2_THREAD_MAX_STACK_SIZE
	default 2048 if 64BIT

config CMSIS_V2_THREAD_DYNAMIC_STACK_SIZE
	default 2048 if 64BIT

endmenu