409 lines
11 KiB
Plaintext
409 lines
11 KiB
Plaintext
# Kconfig - x86 general 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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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are met:
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#
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# 1) Redistributions of source code must retain the above copyright notice,
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# this list of conditions and the following disclaimer.
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#
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# 2) Redistributions in binary form must reproduce the above copyright notice,
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# this list of conditions and the following disclaimer in the documentation
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# and/or other materials provided with the distribution.
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#
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# 3) Neither the name of Wind River Systems nor the names of its contributors
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# may be used to endorse or promote products derived from this software without
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# specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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#
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config X86_32
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def_bool y
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config ARCH_DEFCONFIG
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string
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default "arch/x86/defconfig" if X86_32
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source "kernel/Kconfig"
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source "misc/Kconfig"
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source "arch/x86/core/Kconfig"
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menu "BSP General Configuration"
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choice
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prompt "BSP Configuration"
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default BSP_PCPENTIUM4
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config BSP_ATOM_N28XX
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bool "Minimum configuration for ATOM N28XX BSP"
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select CPU_ATOM
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select IOAPIC
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select LOAPIC
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select LOAPIC_TIMER
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select EOI_HANDLER_SUPPORTED
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select BOOTLOADER_UNKNOWN
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select EXTRA_SERIAL_PORT
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select SERIAL_INTERRUPT_LEVEL
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select CUSTOM_RANDOM_GENERATOR
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select BSP_GENERIC_PC
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config BSP_PCMINUTEIA
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bool "Minimum configuration for MINUTE IA BSP"
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select CPU_MINUTEIA
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select PIC
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select PIT
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select BOI_HANDLER_SUPPORTED
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select EOI_HANDLER_SUPPORTED
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select BOOTLOADER_UNKNOWN
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select EXTRA_SERIAL_PORT
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select BSP_GENERIC_PC
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config BSP_PCPENTIUM4
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bool "Minimum configuration for PENTIUM 4 BSP"
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select CPU_PENTIUM4
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select PIC
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select PIT
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select BOI_HANDLER_SUPPORTED
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select EOI_HANDLER_SUPPORTED
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select BOOTLOADER_UNKNOWN
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select EXTRA_SERIAL_PORT
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select BSP_GENERIC_PC
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config BSP_QUARK
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bool "Minimum configuration for QUARK BSP"
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select CPU_MINUTEIA
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select IOAPIC
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select HPET_TIMER
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select EOI_HANDLER_SUPPORTED
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select BOOTLOADER_UNKNOWN
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select EXTRA_SERIAL_PORT
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select LINK_AUX_COMPILER_LIBS
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select NS16550
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select PCI
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endchoice
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config BSP_GENERIC_PC
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bool
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default n
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select NS16550
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choice
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prompt "Intel Processor"
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default CPU_PENTIUM4
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config CPU_ATOM
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bool "Atom"
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help
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This option signifies the use of a CPU from the Atom family.
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config CPU_MINUTEIA
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bool "Minute IA"
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help
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This option signifies the use of a CPU from the Minute IA family.
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config CPU_PENTIUM4
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bool "Pentium 4"
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help
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This option signifies the use of a CPU from the Pentium 4 family.
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endchoice
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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 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 ADV_IDLE_STACK_SIZE
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int
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prompt "Advanced idle state stack size"
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default 16
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depends on ADVANCED_IDLE
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help
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This option defines the size of the separate stack used during the
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system state check while the booting up. A separate stack is used
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to avoid memory corruption on the system re-activation from power
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down mode. The stack size must be large enough to hold the return
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address (4 bytes) and the _AdvIdleCheckSleep() stack frame.
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config CPU_MIGHT_SUPPORT_CLFLUSH
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bool
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default n
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help
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If a BSP uses a processor that possibly implements CLFLUSH, change
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the default in that BSP's config file.
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#FIXME This options is not being used in the current code base.
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config CLFLUSH_INSTRUCTION_SUPPORTED
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bool
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prompt "CLFLUSH instruction supported" if CPU_MIGHT_SUPPORT_CLFLUSH
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depends on CPU_MIGHT_SUPPORT_CLFLUSH
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default n
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help
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Only enable this if the CLFLUSH instruction is supported, so that
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an implementation of _SysCacheFlush() that uses CLFLUSH is made
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available, instead of the one using WBINVD.
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menu "Specific CPU Capability Support"
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config ISA_IA32
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bool
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default y if CPU_ATOM || CPU_MINUTEIA || CPU_PENTIUM4
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default n
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help
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This option signifies the use of a CPU based on the Intel IA-32
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instruction set architecture.
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config HARDWARE_BP_SUPPORTED
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def_bool y
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depends on ISA_IA32
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help
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This option signifies that the target supports hardware-based
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instruction breakpoints and/or data watchpoints.
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config TICKLESS_IDLE_UNSUPPORTED
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prompt "Tickless Idle Unsupported"
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bool
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default n
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help
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This option signifies the use of an Intel CPU that lacks
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support for tickless idle.
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config CMOV_UNSUPPORTED
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def_bool y
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depends on CPU_MINUTEIA
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help
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This option signifies the use of an Intel CPU that lacks support
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for the CMOV instruction.
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config CPU_FLOAT_UNSUPPORTED
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def_bool y
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depends on CPU_MINUTEIA
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select CPU_SSE_UNSUPPORTED
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help
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This option signifies the use of an Intel CPU that lacks support
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for floating point operations.
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config CPU_SSE_UNSUPPORTED
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bool "CPU SSE unsupported"
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default n
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help
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This option signifies the use of an Intel CPU that lacks support
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for SSEx instructions (i.e. those which pre-date Pentium III).
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config CACHE_LINE_SIZE
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int "Cache line size"
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default 64 if CPU_ATOM || CPU_PENTIUM4
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default 0
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help
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Size in bytes of a CPU cache line.
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endmenu
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menu "Specific BSP Capability Support"
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config NUM_DYNAMIC_STUBS
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int "Number of dynamic int stubs"
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default 0
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help
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This option specifies the number of interrupt handlers that can be
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installed dynamically using irq_connect().
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config PROT_MODE_SWITCH_PROMPT
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bool "Prot Mode switch prompt"
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default n
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help
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This option allows users to select the value of the PROT_MODE_SWITCH
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configuration option.
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config ADVANCED_IDLE_SUPPORTED
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bool "Advanced idle supported"
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default n
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help
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This option signifies that the target supports the ADVANCED_IDLE
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configuration option.
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endmenu
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config BOOTLOADER_UNKNOWN
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bool
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default n
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help
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This option signifies that the target has an unknown bootloader
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or that it supports multiple ways of booting and it isn't clear
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at build time which method is to be used. When this option is enabled
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the BSP may have to do extra work to ensure a propert startup.
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menu "Boot Sequence Options"
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depends on PROT_MODE_SWITCH_PROMPT
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config PROT_MODE_SWITCH
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bool
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prompt "Switch to 32-bit protected mode when booting"
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default n
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depends on PROT_MODE_SWITCH_PROMPT
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help
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This option causes the kernel to transition from real mode (16-bit)
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to protected mode (32-bit) during its initial booting sequence.
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config BOOT_A20_ENABLE
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bool "Boot A20 enable"
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depends on PROT_MODE_SWITCH
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default n
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help
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This option causes the A20 line to be enabled during the transition
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from real mode (16-bit) to protected mode (32-bit) during its initial
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booting sequence.
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endmenu
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config SHUTOFF_PIC
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bool "Shutoff PIC"
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depends on !PIC
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default n
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help
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This option disables all interrupts on the PIC
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endmenu
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menu "Floating Point Options"
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depends on !CPU_FLOAT_UNSUPPORTED
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config FLOAT
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bool
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prompt "Floating point instructions"
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default n
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select FP_SHARING if ENHANCED_SECURITY
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help
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This option enables the use of x87 FPU and MMX instructions by
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a task or fiber.
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Disabling this option means that any task or fiber that uses a
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floating point instruction will get a fatal exception.
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config SSE
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bool
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prompt "SSEx instructions"
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depends on FLOAT && !CPU_SSE_UNSUPPORTED
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default n
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help
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This option enables the use of SSEx instructions by a task or fiber.
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Disabling this option means that no task or fiber may use SSEx
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instructions; any such use will result in undefined behavior.
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config SSE_FP_MATH
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bool
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prompt "Compiler-generated SSEx instructions" if FP_SHARING
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depends on SSE && ISA_IA32
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default n if FP_SHARING
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default y if !FP_SHARING
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help
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This option allows the compiler to generate SSEx instructions for
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performing floating point math. This can greatly improve performance
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when exactly the same operations are to be performed on multiple
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data objects; however, it can also significantly reduce performance
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when pre-emptive task switches occur because of the larger register
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set that must be saved and restored.
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Disabling this option means that the compiler utilizes only the
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x87 instruction set for floating point operations.
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config FP_SHARING
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bool
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prompt "Floating point resource sharing" if !ENHANCED_SECURITY
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depends on FLOAT
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default n
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select AUTOMATIC_FP_ENABLING if ENHANCED_SECURITY
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help
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This option allows multiple tasks and fibers to safely utilize
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floating point hardware resources. Every task or fiber that wishes
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to use floating point instructions (i.e. x87 FPU, MMX, or SSEx) must
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be created with such support already enabled, or must enable this
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support via task_float_enable() or fiber_float_enable() before
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executing these instructions.
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Enabling this option adds 108 bytes to the stack size requirement
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of each task or fiber that utilizes x87 FPU or MMX instructions,
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and adds 464 bytes to the stack size requirement of each task or
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fiber that utilizes SSEx instructions. (The stack size requirement
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of tasks and fibers that do not utilize floating point instructions
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remains unchanged.)
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Disabling this option means that only a single task or fiber may
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utilize x87 FPU, MMX, or SSEx instructions. (The stack size
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requirement of all tasks and fibers remains unchanged.)
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config AUTOMATIC_FP_ENABLING
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bool
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prompt "Automatically enable floating point resource sharing" \
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if !ENHANCED_SECURITY
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depends on FP_SHARING
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default n
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help
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This option allows tasks and fibers to safely utilize floating
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point hardware resources without requiring them to first indicate
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their intention to do so. The system automatically detects when
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a task or fiber that does not currently have floating point support
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enabled uses a floating point instruction, and automatically executes
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task_float_enable() or fiber_float_enable() on its behalf. The
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task or fiber is enabled for using x87 FPU, MMX, or SSEx instructions
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if SSE is configured, otherwise it is enabled for using x87 FPU or
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MMX instructions only.
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config XIP
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default n
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endmenu
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config PCI
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bool
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# omit prompt to signify a "hidden" option
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default n
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help
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This options enables support of PCI bus enumeration for device
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drivers.
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config PCI_DEBUG
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bool
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prompt "Enable PCI debugging"
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depends on PCI
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default n
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help
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This options enables PCI debigging functions
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if BSP_GENERIC_PC
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source "arch/x86/generic_pc/Kconfig"
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endif
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if BSP_QUARK
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source "arch/x86/quark/Kconfig"
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endif
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source "drivers/Kconfig"
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source "net/Kconfig"
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