158 lines
4.5 KiB
Plaintext
158 lines
4.5 KiB
Plaintext
# Kconfig - nanokernel configuration options
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#
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# Copyright (c) 2014-2015 Wind River Systems, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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menu "Nanokernel Options"
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config BOOT_BANNER
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bool
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prompt "Boot banner"
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default n
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select PRINTK
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select EARLY_CONSOLE
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help
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This option outputs a banner to the console device during boot up. It
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also embeds a date & time stamp in the kernel and in each USAP image.
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config BUILD_TIMESTAMP
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bool
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prompt "Build Timestamp"
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help
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Build timestamp and add it to the boot banner.
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config INT_LATENCY_BENCHMARK
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bool
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prompt "Interrupt latency metrics [EXPERIMENTAL]"
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default n
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depends on ARCH="x86"
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help
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This option enables the tracking of interrupt latency metrics;
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the exact set of metrics being tracked is board-dependent.
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Tracking begins when int_latency_init() is invoked by an application.
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The metrics are displayed (and a new sampling interval is started)
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each time int_latency_show() is called thereafter.
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config MAIN_STACK_SIZE
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int
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prompt "Background task stack size (in bytes)"
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default 1024
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help
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This option specifies the size of the stack used by the kernel's
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background task, whose entry point is main().
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config ISR_STACK_SIZE
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int
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prompt "ISR and initialization stack size (in bytes)"
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default 2048
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help
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This option specifies the size of the stack used by interrupt
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service routines (ISRs), and during nanokernel initialization.
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config THREAD_CUSTOM_DATA
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bool
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prompt "Task and fiber custom data"
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default n
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help
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This option allows each task and fiber to store 32 bits of custom data,
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which can be accessed using the sys_thread_custom_data_xxx() APIs.
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config NANO_TIMEOUTS
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bool
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prompt "Enable timeouts on nanokernel objects"
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default n
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depends on SYS_CLOCK_EXISTS
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help
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Allow fibers and tasks to wait on nanokernel objects with a timeout, by
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enabling the nano_xxx_wait_timeout APIs, and allow fibers to sleep for a
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period of time, by enabling the fiber_sleep API.
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config NANO_TIMERS
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bool
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prompt "Enable nanokernel timers"
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default y if NANOKERNEL
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default n
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depends on SYS_CLOCK_EXISTS
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help
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Allow fibers and tasks to wait on nanokernel timers, which can be
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accessed using the nano_timer_xxx() APIs.
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config NANOKERNEL_TICKLESS_IDLE_SUPPORTED
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bool
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default n
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help
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To be selected by an architecture if it does support tickless idle in
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nanokernel systems.
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config ERRNO
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bool
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prompt "Enable errno support"
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default y
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help
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Enable per-thread errno in the kernel. Application and library code must
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include errno.h provided by the C library (libc) to use the errno symbol.
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The C library must access the per-thread errno via the _get_errno() symbol.
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config NANO_WORKQUEUE
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bool "Enable nano workqueue support"
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default n
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help
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Nano workqueues allow scheduling work items to be executed in a fiber
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context. Typically such work items are scheduled from ISRs, when the
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work cannot be executed in interrupt context.
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config SYSTEM_WORKQUEUE
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bool "Start a system workqueue"
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default y
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depends on NANO_WORKQUEUE
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help
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Start a system-wide nano_workqueue that can be used by any system
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component.
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config SYSTEM_WORKQUEUE_STACK_SIZE
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int "System workqueue stack size"
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default 1024
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depends on SYSTEM_WORKQUEUE
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config SYSTEM_WORKQUEUE_PRIORITY
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int "System workqueue priority"
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default 10
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depends on SYSTEM_WORKQUEUE
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config ATOMIC_OPERATIONS_BUILTIN
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bool
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help
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Use the compiler builtin functions for atomic operations. This is
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the preferred method. However, support for all arches in GCC is
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incomplete.
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config ATOMIC_OPERATIONS_CUSTOM
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bool
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help
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Use when there isn't support for compiler built-ins, but you have
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written optimized assembly code under arch/ which implements these.
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config ATOMIC_OPERATIONS_C
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bool
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help
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Use atomic operations routines that are implemented entirely
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in C by locking interrupts. Selected by architectures which either
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do not have support for atomic operations in their instruction
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set, or haven't been implemented yet during bring-up, and also
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the compiler does not have support for the atomic __sync_* builtins.
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endmenu
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