4db2ce0199
Several implementations were essentialy a common piece of C code using the cmpxchg() macro. Put the implementation in one spot that everyone can share, and convert sparc64 over to using this. Alpha is the lone arch-specific implementation, which codes up a special fast path for the common case in order to avoid GP reloading which a pure C version would require. Signed-off-by: David S. Miller <davem@davemloft.net>
259 lines
7.3 KiB
Plaintext
259 lines
7.3 KiB
Plaintext
# For a description of the syntax of this configuration file,
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# see Documentation/kbuild/config-language.txt.
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mainmenu "Linux/Xtensa Kernel Configuration"
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config FRAME_POINTER
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bool
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default n
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config XTENSA
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bool
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default y
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help
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Xtensa processors are 32-bit RISC machines designed by Tensilica
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primarily for embedded systems. These processors are both
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configurable and extensible. The Linux port to the Xtensa
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architecture supports all processor configurations and extensions,
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with reasonable minimum requirements. The Xtensa Linux project has
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a home page at <http://xtensa.sourceforge.net/>.
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config UID16
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bool
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default n
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config RWSEM_XCHGADD_ALGORITHM
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bool
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default y
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config GENERIC_HARDIRQS
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bool
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default y
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source "init/Kconfig"
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menu "Processor type and features"
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choice
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prompt "Xtensa Processor Configuration"
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default XTENSA_CPU_LINUX_BE
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config XTENSA_CPU_LINUX_BE
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bool "linux_be"
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---help---
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The linux_be processor configuration is the baseline Xtensa
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configurations included in this kernel and also used by
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binutils, gcc, and gdb. It contains no TIE, no coprocessors,
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and the following configuration options:
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Code Density Option 2 Misc Special Registers
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NSA/NSAU Instructions 128-bit Data Bus Width
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Processor ID 8K, 2-way I and D Caches
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Zero-Overhead Loops 2 Inst Address Break Registers
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Big Endian 2 Data Address Break Registers
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64 General-Purpose Registers JTAG Interface and Trace Port
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17 Interrupts MMU w/ TLBs and Autorefill
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3 Interrupt Levels 8 Autorefill Ways (I/D TLBs)
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3 Timers Unaligned Exceptions
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endchoice
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config MMU
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bool
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default y
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config XTENSA_UNALIGNED_USER
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bool "Unaligned memory access in use space"
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---help---
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The Xtensa architecture currently does not handle unaligned
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memory accesses in hardware but through an exception handler.
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Per default, unaligned memory accesses are disabled in user space.
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Say Y here to enable unaligned memory access in user space.
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config PREEMPT
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bool "Preemptible Kernel"
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---help---
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This option reduces the latency of the kernel when reacting to
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real-time or interactive events by allowing a low priority process to
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be preempted even if it is in kernel mode executing a system call.
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Unfortunately the kernel code has some race conditions if both
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CONFIG_SMP and CONFIG_PREEMPT are enabled, so this option is
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currently disabled if you are building an SMP kernel.
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Say Y here if you are building a kernel for a desktop, embedded
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or real-time system. Say N if you are unsure.
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config MATH_EMULATION
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bool "Math emulation"
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help
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Can we use information of configuration file?
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config HIGHMEM
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bool "High memory support"
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endmenu
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menu "Platform options"
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choice
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prompt "Xtensa System Type"
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default XTENSA_PLATFORM_ISS
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config XTENSA_PLATFORM_ISS
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bool "ISS"
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help
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ISS is an acronym for Tensilica's Instruction Set Simulator.
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config XTENSA_PLATFORM_XT2000
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bool "XT2000"
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help
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XT2000 is the name of Tensilica's feature-rich emulation platform.
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This hardware is capable of running a full Linux distribution.
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endchoice
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config XTENSA_CALIBRATE_CCOUNT
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bool "Auto calibration of the CPU clock rate"
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---help---
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On some platforms (XT2000, for example), the CPU clock rate can
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vary. The frequency can be determined, however, by measuring
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against a well known, fixed frequency, such as an UART oscillator.
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config XTENSA_CPU_CLOCK
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int "CPU clock rate [MHz]"
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depends on !XTENSA_CALIBRATE_CCOUNT
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default "16"
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config GENERIC_CALIBRATE_DELAY
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bool "Auto calibration of the BogoMIPS value"
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---help---
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The BogoMIPS value can easily be derived from the CPU frequency.
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config CMDLINE_BOOL
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bool "Default bootloader kernel arguments"
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config CMDLINE
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string "Initial kernel command string"
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depends on CMDLINE_BOOL
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default "console=ttyS0,38400 root=/dev/ram"
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help
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On some architectures (EBSA110 and CATS), there is currently no way
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for the boot loader to pass arguments to the kernel. For these
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architectures, you should supply some command-line options at build
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time by entering them here. As a minimum, you should specify the
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memory size and the root device (e.g., mem=64M root=/dev/nfs).
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config SERIAL_CONSOLE
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bool
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depends on XTENSA_PLATFORM_ISS
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default y
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config XTENSA_ISS_NETWORK
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bool
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depends on XTENSA_PLATFORM_ISS
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default y
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source "mm/Kconfig"
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endmenu
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menu "Bus options"
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config PCI
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bool "PCI support" if !XTENSA_PLATFORM_ISS
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depends on !XTENSA_PLATFORM_ISS
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default y
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help
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Find out whether you have a PCI motherboard. PCI is the name of a
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bus system, i.e. the way the CPU talks to the other stuff inside
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your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
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VESA. If you have PCI, say Y, otherwise N.
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The PCI-HOWTO, available from
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<http://www.linuxdoc.org/docs.html#howto>, contains valuable
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information about which PCI hardware does work under Linux and which
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doesn't
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source "drivers/pci/Kconfig"
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config HOTPLUG
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bool "Support for hot-pluggable devices"
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---help---
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Say Y here if you want to plug devices into your computer while
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the system is running, and be able to use them quickly. In many
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cases, the devices can likewise be unplugged at any time too.
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One well known example of this is PCMCIA- or PC-cards, credit-card
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size devices such as network cards, modems or hard drives which are
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plugged into slots found on all modern laptop computers. Another
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example, used on modern desktops as well as laptops, is USB.
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Enable HOTPLUG and KMOD, and build a modular kernel. Get agent
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software (at <http://linux-hotplug.sourceforge.net/>) and install it.
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Then your kernel will automatically call out to a user mode "policy
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agent" (/sbin/hotplug) to load modules and set up software needed
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to use devices as you hotplug them.
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source "drivers/pcmcia/Kconfig"
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source "drivers/pci/hotplug/Kconfig"
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endmenu
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menu "Exectuable file formats"
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# only elf supported
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config KCORE_ELF
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bool
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depends on PROC_FS
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default y
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help
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If you enabled support for /proc file system then the file
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/proc/kcore will contain the kernel core image in ELF format. This
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can be used in gdb:
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$ cd /usr/src/linux ; gdb vmlinux /proc/kcore
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This is especially useful if you have compiled the kernel with the
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"-g" option to preserve debugging information. It is mainly used
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for examining kernel data structures on the live kernel.
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source "fs/Kconfig.binfmt"
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endmenu
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source "net/Kconfig"
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source "drivers/Kconfig"
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source "fs/Kconfig"
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menu "Xtensa initrd options"
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depends on BLK_DEV_INITRD
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config EMBEDDED_RAMDISK
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bool "Embed root filesystem ramdisk into the kernel"
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config EMBEDDED_RAMDISK_IMAGE
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string "Filename of gziped ramdisk image"
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depends on EMBEDDED_RAMDISK
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default "ramdisk.gz"
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help
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This is the filename of the ramdisk image to be built into the
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kernel. Relative pathnames are relative to arch/xtensa/boot/ramdisk/.
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The ramdisk image is not part of the kernel distribution; you must
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provide one yourself.
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endmenu
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source "arch/xtensa/Kconfig.debug"
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source "security/Kconfig"
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source "crypto/Kconfig"
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source "lib/Kconfig"
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