# Kconfig - general architecture configuration options # # Copyright (c) 2014-2015 Wind River Systems, Inc. # Copyright (c) 2015 Intel Corporation # Copyright (c) 2016 Cadence Design Systems, Inc. # # SPDX-License-Identifier: Apache-2.0 # # Include these first so that any properties (e.g. defaults) below can be # overridden (by defining symbols in multiple locations) # Note: $ARCH might be a glob pattern source "$(ARCH_DIR)/$(ARCH)/Kconfig" choice ARCH_CHOICE prompt "Architecture" default X86 config ARC bool "ARC architecture" select HAS_DTS config ARM bool "ARM architecture" select HAS_DTS config X86 bool "x86 architecture" select ATOMIC_OPERATIONS_BUILTIN select HAS_DTS config X86_64 bool "x86_64 architecture" select ATOMIC_OPERATIONS_BUILTIN select SCHED_IPI_SUPPORTED config NIOS2 bool "Nios II Gen 2 architecture" select ATOMIC_OPERATIONS_C select HAS_DTS config RISCV bool "RISCV architecture" select HAS_DTS config XTENSA bool "Xtensa architecture" select HAS_DTS config ARCH_POSIX bool "POSIX (native) architecture" select ATOMIC_OPERATIONS_BUILTIN select ARCH_HAS_CUSTOM_SWAP_TO_MAIN select ARCH_HAS_CUSTOM_BUSY_WAIT select ARCH_HAS_THREAD_ABORT select NATIVE_APPLICATION select HAS_COVERAGE_SUPPORT endchoice menu "General Architecture Options" module = ARCH module-str = arch source "subsys/logging/Kconfig.template.log_config" module = MPU module-str = mpu source "subsys/logging/Kconfig.template.log_config" config BIG_ENDIAN bool help This option tells the build system that the target system is big-endian. Little-endian architecture is the default and should leave this option unselected. This option is selected by arch/$ARCH/Kconfig, soc/**/Kconfig, or boards/**/Kconfig and the user should generally avoid modifying it. The option is used to select linker script OUTPUT_FORMAT and command line option for gen_isr_tables.py. config 64BIT bool help This option tells the build system that the target system is using a 64-bit address space, meaning that pointer and long types are 64 bits wide. This option is selected by arch/$ARCH/Kconfig, soc/**/Kconfig, or boards/**/Kconfig and the user should generally avoid modifying it. if ARC || ARM || NIOS2 || X86 || X86_64 config SRAM_SIZE int "SRAM Size in kB" default $(dt_int_val,DT_SRAM_SIZE) help This option specifies the size of the SRAM in kB. It is normally set by the board's defconfig file and the user should generally avoid modifying it via the menu configuration. config SRAM_BASE_ADDRESS hex "SRAM Base Address" default $(dt_hex_val,DT_SRAM_BASE_ADDRESS) help This option specifies the base address of the SRAM on the board. It is normally set by the board's defconfig file and the user should generally avoid modifying it via the menu configuration. config FLASH_SIZE int "Flash Size in kB" default $(dt_int_val,DT_FLASH_SIZE) if (XIP && ARM) || !ARM help This option specifies the size of the flash in kB. It is normally set by the board's defconfig file and the user should generally avoid modifying it via the menu configuration. config FLASH_BASE_ADDRESS hex "Flash Base Address" default $(dt_hex_val,DT_FLASH_BASE_ADDRESS) if (XIP && ARM) || !ARM help This option specifies the base address of the flash on the board. It is normally set by the board's defconfig file and the user should generally avoid modifying it via the menu configuration. endif # ARM || ARC || NIOS2 || X86 || X86_64 if ARCH_HAS_TRUSTED_EXECUTION config TRUSTED_EXECUTION_SECURE bool "Trusted Execution: Secure firmware image" help Select this option to enable building a Secure firmware image for a platform that supports Trusted Execution. A Secure firmware image will execute in Secure state. It may allow the CPU to execute in Non-Secure (Normal) state. Therefore, a Secure firmware image shall be able to configure security attributions of CPU resources (memory areas, peripherals, interrupts, etc.) as well as to handle faults, related to security violations. It may optionally allow certain functions to be called from the Non-Secure (Normal) domain. config TRUSTED_EXECUTION_NONSECURE depends on !TRUSTED_EXECUTION_SECURE bool "Trusted Execution: Non-Secure firmware image" help Select this option to enable building a Non-Secure firmware image for a platform that supports Trusted Execution. A Non-Secure firmware image will execute in Non-Secure (Normal) state. Therefore, it shall not access CPU resources (memory areas, peripherals, interrupts etc.) belonging to the Secure domain. endif # ARCH_HAS_TRUSTED_EXECUTION config HW_STACK_PROTECTION bool "Hardware Stack Protection" depends on ARCH_HAS_STACK_PROTECTION help Select this option to enable hardware-based platform features to catch stack overflows when the system is running in privileged mode. If CONFIG_USERSPACE is not enabled, the system is always running in privileged mode. Note that this does not necessarily prevent corruption and assertions about the overall system state when a fault is triggered cannot be made. config USERSPACE bool "User mode threads" depends on ARCH_HAS_USERSPACE help When enabled, threads may be created or dropped down to user mode, which has significantly restricted permissions and must interact with the kernel via system calls. See Zephyr documentation for more details about this feature. If a user thread overflows its stack, this will be caught and the kernel itself will be shielded from harm. Enabling this option may or may not catch stack overflows when the system is in privileged mode or handling a system call; to ensure these are always caught, enable CONFIG_HW_STACK_PROTECTION. config PRIVILEGED_STACK_SIZE int "Size of privileged stack" default 1024 depends on ARCH_HAS_USERSPACE help This option sets the privileged stack region size that will be used in addition to the user mode thread stack. During normal execution, this region will be inaccessible from user mode. During system calls, this region will be utilized by the system call. config PRIVILEGED_STACK_TEXT_AREA int "Privileged stacks text area" default 512 if COVERAGE_GCOV default 256 depends on ARCH_HAS_USERSPACE help Stack text area size for privileged stacks. config KOBJECT_TEXT_AREA int "Size if kobject text area" default 512 if COVERAGE_GCOV default 512 if NO_OPTIMIZATIONS default 256 depends on ARCH_HAS_USERSPACE help Size of kernel object text area. Used in linker script. config STACK_GROWS_UP bool "Stack grows towards higher memory addresses" help Select this option if the architecture has upward growing thread stacks. This is not common. config MAX_THREAD_BYTES int "Bytes to use when tracking object thread permissions" default 2 depends on USERSPACE help Every kernel object will have an associated bitfield to store thread permissions for that object. This controls the size of the bitfield (in bytes) and imposes a limit on how many threads can be created in the system. config DYNAMIC_OBJECTS bool "Allow kernel objects to be allocated at runtime" depends on USERSPACE help Enabling this option allows for kernel objects to be requested from the calling thread's resource pool, at a slight cost in performance due to the supplemental run-time tables required to validate such objects. Objects allocated in this way can be freed with a supervisor-only API call, or when the number of references to that object drops to zero. if ARCH_HAS_NOCACHE_MEMORY_SUPPORT config NOCACHE_MEMORY bool "Support for uncached memory" help Add a "nocache" read-write memory section that is configured to not be cached. This memory section can be used to perform DMA transfers when cache coherence issues are not optimal or can not be solved using cache maintenance operations. endif # ARCH_HAS_NOCACHE_MEMORY_SUPPORT menu "Interrupt Configuration" # # Interrupt related configs # config DYNAMIC_INTERRUPTS bool "Enable installation of IRQs at runtime" help Enable installation of interrupts at runtime, which will move some interrupt-related data structures to RAM instead of ROM, and on some architectures increase code size. config GEN_ISR_TABLES bool "Use generated IRQ tables" help This option controls whether a platform uses the gen_isr_tables script to generate its interrupt tables. This mechanism will create an appropriate hardware vector table and/or software IRQ table. config GEN_IRQ_VECTOR_TABLE bool "Generate an interrupt vector table" default y depends on GEN_ISR_TABLES help This option controls whether a platform using gen_isr_tables needs an interrupt vector table created. Only disable this if the platform does not use a vector table at all, or requires the vector table to be in a format that is not an array of function pointers indexed by IRQ line. In the latter case, the vector table must be supplied by the application or architecture code. config GEN_SW_ISR_TABLE bool "Generate a software ISR table" default y depends on GEN_ISR_TABLES help This option controls whether a platform using gen_isr_tables needs a software ISR table table created. This is an array of struct _isr_table_entry containing the interrupt service routine and supplied parameter. config ARCH_SW_ISR_TABLE_ALIGN int "Alignment size of a software ISR table" default 0 depends on GEN_SW_ISR_TABLE help This option controls alignment size of generated _sw_isr_table. Some architecture needs a software ISR table to be aligned to architecture specific size. The default size is 0 for no alignment. config GEN_IRQ_START_VECTOR int default 0 depends on GEN_ISR_TABLES help On some architectures, part of the vector table may be reserved for system exceptions and is declared separately from the tables created by gen_isr_tables.py. When creating these tables, this value will be subtracted from CONFIG_NUM_IRQS to properly size them. This is a hidden option which needs to be set per architecture and left alone. config IRQ_OFFLOAD bool "Enable IRQ offload" help Enable irq_offload() API which allows functions to be synchronously run in interrupt context. Mainly useful for test cases. endmenu # Interrupt configuration endmenu # # Architecture Capabilities # config ARCH_HAS_TRUSTED_EXECUTION bool config ARCH_HAS_STACK_PROTECTION bool config ARCH_HAS_USERSPACE bool config ARCH_HAS_EXECUTABLE_PAGE_BIT bool config ARCH_HAS_NOCACHE_MEMORY_SUPPORT bool config ARCH_HAS_RAMFUNC_SUPPORT bool # # Other architecture related options # config ARCH_HAS_THREAD_ABORT bool # # Hidden PM feature configs which are to be selected by # individual SoC. # config HAS_SYS_POWER_STATE_SLEEP_1 # Hidden bool help This option signifies that the target supports the SYS_POWER_STATE_SLEEP_1 configuration option. config HAS_SYS_POWER_STATE_SLEEP_2 # Hidden bool help This option signifies that the target supports the SYS_POWER_STATE_SLEEP_2 configuration option. config HAS_SYS_POWER_STATE_SLEEP_3 # Hidden bool help This option signifies that the target supports the SYS_POWER_STATE_SLEEP_3 configuration option. config HAS_SYS_POWER_STATE_DEEP_SLEEP_1 # Hidden bool help This option signifies that the target supports the SYS_POWER_STATE_DEEP_SLEEP_1 configuration option. config HAS_SYS_POWER_STATE_DEEP_SLEEP_2 # Hidden bool help This option signifies that the target supports the SYS_POWER_STATE_DEEP_SLEEP_2 configuration option. config HAS_SYS_POWER_STATE_DEEP_SLEEP_3 # Hidden bool help This option signifies that the target supports the SYS_POWER_STATE_DEEP_SLEEP_3 configuration option. config BOOTLOADER_CONTEXT_RESTORE_SUPPORTED # Hidden bool help This option signifies that the target has options of bootloaders that support context restore upon resume from deep sleep # End hidden CPU family configs # config CPU_HAS_TEE bool help This option is enabled when the CPU has support for Trusted Execution Environment (e.g. when it has a security attribution unit). config CPU_HAS_FPU bool help This option is enabled when the CPU has hardware floating point unit. config CPU_HAS_MPU bool # Omit prompt to signify "hidden" option help This option is enabled when the CPU has a Memory Protection Unit (MPU). config MEMORY_PROTECTION bool # Omit prompt to signify "hidden" option help This option is enabled when Memory Protection features are supported. Memory protection support is currently available on ARC, ARM, and x86 architectures. config MPU_REQUIRES_POWER_OF_TWO_ALIGNMENT bool # Omit prompt to signify "hidden" option help This option is enabled when the MPU requires a power of two alignment and size for MPU regions. config MPU_REQUIRES_NON_OVERLAPPING_REGIONS bool # Omit prompt to signify "hidden" option help This option is enabled when the MPU requires the active (i.e. enabled) MPU regions to be non-overlapping with each other. menuconfig FLOAT bool "Floating point" depends on CPU_HAS_FPU depends on ARM || X86 || ARC help This option allows threads to use the floating point registers. By default, only a single thread may use the registers. Disabling this option means that any thread that uses a floating point register will get a fatal exception. if FLOAT config FP_SHARING bool "Floating point register sharing" help This option allows multiple threads to use the floating point registers. endif # FLOAT # # End hidden PM feature configs # config ARCH string help System architecture string. config SOC string help SoC name which can be found under soc//. This option holds the directory name used by the build system to locate the correct linker and header files for the SoC. config SOC_SERIES string help SoC series name which can be found under soc///. This option holds the directory name used by the build system to locate the correct linker and header files. config SOC_FAMILY string help SoC family name which can be found under soc//. This option holds the directory name used by the build system to locate the correct linker and header files. config BOARD string help This option holds the name of the board and is used to locate the files related to the board in the source tree (under boards/). The Board is the first location where we search for a linker.ld file, if not found we look for the linker file in soc///