226 lines
6.9 KiB
Plaintext
226 lines
6.9 KiB
Plaintext
# Kconfig - kernel configuration options
|
|
|
|
#
|
|
# Copyright (c) 2014-2015 Wind River Systems, Inc.
|
|
#
|
|
# Redistribution and use in source and binary forms, with or without
|
|
# modification, are permitted provided that the following conditions are met:
|
|
#
|
|
# 1) Redistributions of source code must retain the above copyright notice,
|
|
# this list of conditions and the following disclaimer.
|
|
#
|
|
# 2) Redistributions in binary form must reproduce the above copyright notice,
|
|
# this list of conditions and the following disclaimer in the documentation
|
|
# and/or other materials provided with the distribution.
|
|
#
|
|
# 3) Neither the name of Wind River Systems nor the names of its contributors
|
|
# may be used to endorse or promote products derived from this software without
|
|
# specific prior written permission.
|
|
#
|
|
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
|
|
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
# POSSIBILITY OF SUCH DAMAGE.
|
|
#
|
|
|
|
choice
|
|
prompt "Kernel Type"
|
|
default MICROKERNEL
|
|
|
|
config NANOKERNEL
|
|
bool "Nano Kernel"
|
|
|
|
config MICROKERNEL
|
|
bool "Micro Kernel"
|
|
|
|
endchoice
|
|
|
|
menu "General Kernel Options"
|
|
|
|
config SYS_CLOCK_TICKS_PER_SEC
|
|
int
|
|
prompt "System tick frequency (in ticks/second)"
|
|
default 100
|
|
depends on !NO_ISRS
|
|
help
|
|
This option specifies the frequency of the system clock in Hz.
|
|
|
|
config SYS_CLOCK_HW_CYCLES_PER_SEC
|
|
int "System clock's h/w timer frequency"
|
|
default 0
|
|
help
|
|
This option specifies the frequency of the hardware timer used for the
|
|
system clock (in Hz). It is normally set by the platform's defconfig file
|
|
and the user should generally avoid modifying it via the menu configuration.
|
|
|
|
config SYS_CLOCK_EXISTS
|
|
bool
|
|
# omit prompt to signify a "hidden" option
|
|
default n if (SYS_CLOCK_TICKS_PER_SEC = 0)
|
|
default y
|
|
help
|
|
This option specifies that the kernel lacks timer support.
|
|
|
|
config INIT_STACKS
|
|
bool
|
|
prompt "Initialize stack areas"
|
|
default n
|
|
help
|
|
This option instructs the kernel to initialize stack areas with a
|
|
known value (0xaa) before they are first used, so that the high
|
|
water mark can be easily determined. This applies to the stack areas
|
|
for both tasks and fibers, as well as for the microkernel server's command
|
|
stack.
|
|
|
|
config XIP
|
|
bool
|
|
prompt "Execute in place"
|
|
help
|
|
This option allows the kernel to operate with its text and read-only
|
|
sections residing in ROM (or similar read-only memory). Not all platforms
|
|
support this option so it must be used with care; you must also
|
|
supply a linker command file when building your image. Enabling this
|
|
option increases both the code and data footprint of the image.
|
|
|
|
config ENHANCED_SECURITY
|
|
bool
|
|
prompt "Enhanced security features"
|
|
default y if ARCH="x86"
|
|
default n
|
|
help
|
|
This option enables all security features supported by the kernel,
|
|
including those that can have a significant impact on system
|
|
footprint or performance; it also prevents the use of certain kernel
|
|
features that have known security risks.
|
|
|
|
Users can customize these settings using the CUSTOM_SECURITY option
|
|
in the "Security Options" menu.
|
|
|
|
config EVENT_LOGGER
|
|
bool
|
|
prompt "Enable event logger"
|
|
default n
|
|
help
|
|
Enable event logging feature. Allow the usage of a ring buffer to
|
|
transmit event messages with a single interface to collect them.
|
|
|
|
config KERNEL_PROFILER
|
|
bool
|
|
prompt "Enable profiler features"
|
|
default n
|
|
select EVENT_LOGGER
|
|
help
|
|
This feature enables the usage of the profiling logger. Provides the
|
|
logging of sleep events (either entering or leaving low power conditions),
|
|
context switch events, interrupt events, boot events and a method to
|
|
collect these profile messages.
|
|
|
|
config PROFILER_BUFFER_SIZE
|
|
int
|
|
prompt "Profiler buffer size"
|
|
default 128
|
|
depends on KERNEL_PROFILER
|
|
help
|
|
Buffer size in 32-bit words.
|
|
|
|
menu "Profiler points"
|
|
depends on KERNEL_PROFILER
|
|
|
|
config PROFILER_CONTEXT_SWITCH
|
|
bool
|
|
prompt "Context switch profiler point"
|
|
default n
|
|
depends on KERNEL_PROFILER
|
|
help
|
|
Enable the context switch event messages.
|
|
|
|
config PROFILER_INTERRUPT
|
|
bool
|
|
prompt "Interrupt profiler point"
|
|
default n
|
|
depends on KERNEL_PROFILER
|
|
help
|
|
Enable interrupt event messages. These messages provide the following
|
|
information: The time when interrupts occur.
|
|
|
|
config PROFILER_SLEEP
|
|
bool
|
|
prompt "Sleep profiler point"
|
|
default n
|
|
depends on KERNEL_PROFILER && ADVANCED_POWER_MANAGEMENT
|
|
help
|
|
Enable low power condition event messages. These messages provide the
|
|
following information:
|
|
- When the CPU went to sleep mode.
|
|
- When the CPU woke up.
|
|
- The ID of the interrupt that woke the CPU up.
|
|
endmenu
|
|
|
|
menu "Security Options"
|
|
depends on ENHANCED_SECURITY
|
|
|
|
config CUSTOM_SECURITY
|
|
bool
|
|
prompt "Customized security"
|
|
default n
|
|
help
|
|
This option allow users to disable enhanced security features they do
|
|
not wish to use or enable the use of features with security exposures.
|
|
|
|
config STACK_CANARIES
|
|
bool
|
|
prompt "Compiler stack canaries" if CUSTOM_SECURITY
|
|
default n
|
|
help
|
|
This option enables compiler stack canaries support on most functions
|
|
in the kernel. (Kernel functions that reside in LKMs do NOT have
|
|
stack canary support, due to limitations of the LKM technology.)
|
|
|
|
If stack canaries are supported by the compiler, it will emit
|
|
extra code that inserts a canary value into the stack frame when
|
|
a function is entered and validates this value upon exit.
|
|
Stack corruption (such as that caused by buffer overflow) results
|
|
in a fatal error condition for the running entity.
|
|
Enabling this option can result in a significant increase
|
|
in footprint and an associated decrease in performance.
|
|
|
|
If stack canaries are not supported by the compiler, enabling this
|
|
option has no effect.
|
|
endmenu
|
|
|
|
endmenu
|
|
source "kernel/nanokernel/Kconfig"
|
|
|
|
config TICKLESS_IDLE
|
|
bool
|
|
prompt "Tickless idle"
|
|
default y
|
|
depends on ADVANCED_POWER_MANAGEMENT
|
|
help
|
|
This option suppresses periodic system clock interrupts whenever the
|
|
kernel becomes idle. This permits the system to remain in a power
|
|
saving state for extended periods without having to wake up to
|
|
service each tick as it occurs.
|
|
|
|
config TICKLESS_IDLE_THRESH
|
|
int
|
|
prompt "Tickless idle threshold"
|
|
default 3
|
|
depends on TICKLESS_IDLE && MICROKERNEL
|
|
help
|
|
This option disables clock interrupt suppression when the kernel idles
|
|
for only a short period of time. It specifies the minimum number of
|
|
ticks that must occur before the next kernel timer expires in order
|
|
for suppression to happen.
|
|
|
|
if MICROKERNEL
|
|
source "kernel/microkernel/Kconfig"
|
|
endif
|