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https://github.com/zephyrproject-rtos/zephyr
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3888735e0d
This is part of an ongoing development of power management support in zephyr. This implementation builds upon an existing hook interface and adds more enhancements. This was tested with reference implementations on quark_d2000 and quark_se. Change-Id: I28092b7ec90ce1f1cc661cf99ca88708910c8eb2 Signed-off-by: Ramesh Thomas <ramesh.thomas@intel.com>
242 lines
7.1 KiB
Plaintext
242 lines
7.1 KiB
Plaintext
# Kconfig - kernel 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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choice
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prompt "Kernel Type"
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default MICROKERNEL
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config NANOKERNEL
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bool "Nano Kernel"
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config MICROKERNEL
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bool "Micro Kernel"
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endchoice
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menu "General Kernel Options"
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config SYS_CLOCK_TICKS_PER_SEC
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int
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prompt "System tick frequency (in ticks/second)"
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default 100
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help
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This option specifies the frequency of the system clock in Hz.
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config SYS_CLOCK_HW_CYCLES_PER_SEC
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int "System clock's h/w timer frequency"
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help
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This option specifies the frequency of the hardware timer used for the
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system clock (in Hz). This option is set by the platform's Kconfig file
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and the user should generally avoid modifying it via the menu configuration.
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config SYS_CLOCK_EXISTS
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bool
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# omit prompt to signify a "hidden" option
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default n if (SYS_CLOCK_TICKS_PER_SEC = 0)
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default y
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help
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This option specifies that the kernel lacks timer support.
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config INIT_STACKS
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bool
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prompt "Initialize stack areas"
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default n
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help
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This option instructs the kernel to initialize stack areas with a
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known value (0xaa) before they are first used, so that the high
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water mark can be easily determined. This applies to the stack areas
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for both tasks and fibers, as well as for the microkernel server's command
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stack.
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config XIP
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bool
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prompt "Execute in place"
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help
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This option allows the kernel to operate with its text and read-only
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sections residing in ROM (or similar read-only memory). Not all platforms
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support this option so it must be used with care; you must also
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supply a linker command file when building your image. Enabling this
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option increases both the code and data footprint of the image.
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config RING_BUFFER
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bool
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prompt "Enable ring buffers"
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default n
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help
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Enable usage of ring buffers. Similar to nanokernel FIFOs but manage
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their own buffer memory and can store arbitrary data. For optimal
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performance, use buffer sizes that are a power of 2.
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config EVENT_LOGGER
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bool
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prompt "Enable event logger"
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default n
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select RING_BUFFER
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help
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Enable event logging feature. Allow the usage of a ring buffer to
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transmit event messages with a single interface to collect them.
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config KERNEL_EVENT_LOGGER
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bool
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prompt "Enable kernel event logger features"
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default n
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select EVENT_LOGGER
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help
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This feature enables the usage of the profiling logger. Provides the
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logging of sleep events (either entering or leaving low power conditions),
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context switch events, interrupt events, boot events and a method to
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collect these event messages.
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config KERNEL_EVENT_LOGGER_BUFFER_SIZE
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int
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prompt "Kernel event logger buffer size"
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default 128
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depends on KERNEL_EVENT_LOGGER
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help
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Buffer size in 32-bit words.
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config KERNEL_INIT_PRIORITY_DEFAULT
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int
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prompt "Default init priority"
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help
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Defaut minimal init priority for each init level.
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config KERNEL_INIT_PRIORITY_DEVICE
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int
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prompt "Default init priority for device drivers"
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help
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Device driver, that depends on common components, such as
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interrupt controller, but does not depend on other devices,
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uses this init priority.
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menu "Kernel event logging points"
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depends on KERNEL_EVENT_LOGGER
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config KERNEL_EVENT_LOGGER_CONTEXT_SWITCH
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bool
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prompt "Context switch event logging point"
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default n
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depends on KERNEL_EVENT_LOGGER
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help
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Enable the context switch event messages.
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config KERNEL_EVENT_LOGGER_INTERRUPT
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bool
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prompt "Interrupt event logging point"
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default n
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depends on KERNEL_EVENT_LOGGER
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help
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Enable interrupt event messages. These messages provide the following
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information: The time when interrupts occur.
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config KERNEL_EVENT_LOGGER_SLEEP
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bool
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prompt "Sleep event logging point"
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default n
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depends on KERNEL_EVENT_LOGGER && ((MICROKERNEL && ADVANCED_POWER_MANAGEMENT) || NANOKERNEL)
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help
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Enable low power condition event messages. These messages provide the
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following information:
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- When the CPU went to sleep mode.
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- When the CPU woke up.
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- The ID of the interrupt that woke the CPU up.
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endmenu
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menu "Security Options"
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config STACK_CANARIES
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bool
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prompt "Compiler stack canaries"
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default n
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help
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This option enables compiler stack canaries support kernel functions.
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If stack canaries are supported by the compiler, it will emit
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extra code that inserts a canary value into the stack frame when
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a function is entered and validates this value upon exit.
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Stack corruption (such as that caused by buffer overflow) results
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in a fatal error condition for the running entity.
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Enabling this option can result in a significant increase
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in footprint and an associated decrease in performance.
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If stack canaries are not supported by the compiler, enabling this
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option has no effect.
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endmenu
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endmenu
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source "kernel/nanokernel/Kconfig"
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config ADVANCED_POWER_MANAGEMENT
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bool
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prompt "Advanced power management"
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default n
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help
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This option enables the platform to implement extra power management
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policies whenever the kernel becomes idle. The kernel invokes
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_sys_power_save_idle() to inform the power management subsystem of the
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number of ticks until the next kernel timer is due to expire.
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menu "Advanced Power Management Features"
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depends on ADVANCED_POWER_MANAGEMENT
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config ADVANCED_IDLE
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bool
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prompt "Advanced idle state"
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default n
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depends on MICROKERNEL && ADVANCED_POWER_MANAGEMENT && ADVANCED_IDLE_SUPPORTED
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help
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This option enables the kernel to interface to a custom advanced idle
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power saving manager. This permits the system to enter a custom
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power saving state when the kernel becomes idle for extended periods,
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and then to restore the system to its previous state (rather than
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booting up from scratch) when the kernel is re-activated.
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config TICKLESS_IDLE
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bool
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prompt "Tickless idle"
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default y
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depends on MICROKERNEL || NANOKERNEL_TICKLESS_IDLE_SUPPORTED
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help
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This option suppresses periodic system clock interrupts whenever the
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kernel becomes idle. This permits the system to remain in a power
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saving state for extended periods without having to wake up to
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service each tick as it occurs.
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As a policy, an architecture should always provide support for tickless in
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the microkernel. If an architecture also provides support for nanokernel
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systems, it must select the NANOKERNEL_TICKLESS_IDLE_SUPPORTED kconfig
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option.
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config TICKLESS_IDLE_THRESH
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int
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prompt "Tickless idle threshold"
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default 3
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depends on TICKLESS_IDLE
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help
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This option enables clock interrupt suppression when the kernel idles
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for only a short period of time. It specifies the minimum number of
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ticks that must occur before the next kernel timer expires in order
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for suppression to happen.
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endmenu
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if MICROKERNEL
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source "kernel/microkernel/Kconfig"
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endif
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