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5cae841b13
A bunch of drivers use ISA DMA helpers or their equivalents for platforms that have ISA with different DMA controller (a lot of ARM boxen). Currently there is no way to put such dependency in Kconfig - CONFIG_ISA is not it (e.g. it is not set on platforms that have no ISA slots, but have on-board devices that pretend to be ISA ones). New symbol added - ISA_DMA_API. Set when we have functional enable_dma()/set_dma_mode()/etc. set of helpers. Next patches in the series will add missing dependencies for drivers that need them. I'm very carefully staying the hell out of the recurring flamefest on what exactly CONFIG_ISA would mean in ideal world - added symbol has a well-defined meaning and for now I really want to treat it as completely independent from the mess around CONFIG_ISA. Signed-off-by: Al Viro <viro@parcelfarce.linux.theplanet.co.uk> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
483 lines
12 KiB
Plaintext
483 lines
12 KiB
Plaintext
#
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# For a description of the syntax of this configuration file,
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# see Documentation/kbuild/kconfig-language.txt.
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#
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# Note: ISA is disabled and will hopefully never be enabled.
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# If you managed to buy an ISA x86-64 box you'll have to fix all the
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# ISA drivers you need yourself.
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#
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mainmenu "Linux Kernel Configuration"
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config X86_64
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bool
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default y
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help
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Port to the x86-64 architecture. x86-64 is a 64-bit extension to the
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classical 32-bit x86 architecture. For details see
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<http://www.x86-64.org/>.
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config 64BIT
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def_bool y
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config X86
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bool
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default y
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config MMU
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bool
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default y
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config ISA
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bool
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config SBUS
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bool
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config RWSEM_GENERIC_SPINLOCK
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bool
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default y
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config RWSEM_XCHGADD_ALGORITHM
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bool
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config GENERIC_CALIBRATE_DELAY
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bool
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default y
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config X86_CMPXCHG
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bool
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default y
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config EARLY_PRINTK
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bool
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default y
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config GENERIC_ISA_DMA
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bool
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default y
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config GENERIC_IOMAP
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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 "Processor family"
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default MK8
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config MK8
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bool "AMD-Opteron/Athlon64"
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help
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Optimize for AMD Opteron/Athlon64/Hammer/K8 CPUs.
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config MPSC
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bool "Intel EM64T"
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help
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Optimize for Intel Pentium 4 and Xeon CPUs with Intel
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Extended Memory 64 Technology(EM64T). For details see
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<http://www.intel.com/technology/64bitextensions/>.
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config GENERIC_CPU
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bool "Generic-x86-64"
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help
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Generic x86-64 CPU.
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endchoice
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#
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# Define implied options from the CPU selection here
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#
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config X86_L1_CACHE_BYTES
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int
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default "128" if GENERIC_CPU || MPSC
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default "64" if MK8
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config X86_L1_CACHE_SHIFT
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int
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default "7" if GENERIC_CPU || MPSC
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default "6" if MK8
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config X86_TSC
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bool
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default y
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config X86_GOOD_APIC
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bool
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default y
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config MICROCODE
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tristate "/dev/cpu/microcode - Intel CPU microcode support"
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---help---
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If you say Y here the 'File systems' section, you will be
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able to update the microcode on Intel processors. You will
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obviously need the actual microcode binary data itself which is
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not shipped with the Linux kernel.
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For latest news and information on obtaining all the required
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ingredients for this driver, check:
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<http://www.urbanmyth.org/microcode/>.
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To compile this driver as a module, choose M here: the
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module will be called microcode.
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If you use modprobe or kmod you may also want to add the line
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'alias char-major-10-184 microcode' to your /etc/modules.conf file.
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config X86_MSR
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tristate "/dev/cpu/*/msr - Model-specific register support"
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help
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This device gives privileged processes access to the x86
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Model-Specific Registers (MSRs). It is a character device with
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major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
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MSR accesses are directed to a specific CPU on multi-processor
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systems.
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config X86_CPUID
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tristate "/dev/cpu/*/cpuid - CPU information support"
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help
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This device gives processes access to the x86 CPUID instruction to
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be executed on a specific processor. It is a character device
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with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
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/dev/cpu/31/cpuid.
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# disable it for opteron optimized builds because it pulls in ACPI_BOOT
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config X86_HT
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bool
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depends on SMP && !MK8
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default y
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config MATH_EMULATION
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bool
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config MCA
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bool
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config EISA
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bool
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config X86_IO_APIC
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bool
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default y
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config X86_LOCAL_APIC
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bool
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default y
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config MTRR
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bool "MTRR (Memory Type Range Register) support"
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---help---
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On Intel P6 family processors (Pentium Pro, Pentium II and later)
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the Memory Type Range Registers (MTRRs) may be used to control
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processor access to memory ranges. This is most useful if you have
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a video (VGA) card on a PCI or AGP bus. Enabling write-combining
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allows bus write transfers to be combined into a larger transfer
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before bursting over the PCI/AGP bus. This can increase performance
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of image write operations 2.5 times or more. Saying Y here creates a
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/proc/mtrr file which may be used to manipulate your processor's
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MTRRs. Typically the X server should use this.
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This code has a reasonably generic interface so that similar
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control registers on other processors can be easily supported
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as well.
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Saying Y here also fixes a problem with buggy SMP BIOSes which only
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set the MTRRs for the boot CPU and not for the secondary CPUs. This
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can lead to all sorts of problems, so it's good to say Y here.
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Just say Y here, all x86-64 machines support MTRRs.
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See <file:Documentation/mtrr.txt> for more information.
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config SMP
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bool "Symmetric multi-processing support"
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---help---
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This enables support for systems with more than one CPU. If you have
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a system with only one CPU, like most personal computers, say N. If
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you have a system with more than one CPU, say Y.
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If you say N here, the kernel will run on single and multiprocessor
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machines, but will use only one CPU of a multiprocessor machine. If
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you say Y here, the kernel will run on many, but not all,
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singleprocessor machines. On a singleprocessor machine, the kernel
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will run faster if you say N here.
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If you don't know what to do here, say N.
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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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This allows applications to run more reliably even when the system is
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under load. On contrary it may also break your drivers and add
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priority inheritance problems to your system. Don't select it if
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you rely on a stable system or have slightly obscure hardware.
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It's also not very well tested on x86-64 currently.
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You have been warned.
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Say Y here if you are feeling brave and building a kernel for a
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desktop, embedded or real-time system. Say N if you are unsure.
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config PREEMPT_BKL
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bool "Preempt The Big Kernel Lock"
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depends on PREEMPT
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default y
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help
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This option reduces the latency of the kernel by making the
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big kernel lock preemptible.
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Say Y here if you are building a kernel for a desktop system.
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Say N if you are unsure.
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config SCHED_SMT
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bool "SMT (Hyperthreading) scheduler support"
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depends on SMP
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default n
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help
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SMT scheduler support improves the CPU scheduler's decision making
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when dealing with Intel Pentium 4 chips with HyperThreading at a
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cost of slightly increased overhead in some places. If unsure say
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N here.
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config K8_NUMA
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bool "K8 NUMA support"
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select NUMA
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depends on SMP
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help
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Enable NUMA (Non Unified Memory Architecture) support for
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AMD Opteron Multiprocessor systems. The kernel will try to allocate
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memory used by a CPU on the local memory controller of the CPU
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and add some more NUMA awareness to the kernel.
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This code is recommended on all multiprocessor Opteron systems
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and normally doesn't hurt on others.
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config NUMA_EMU
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bool "NUMA emulation support"
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select NUMA
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depends on SMP
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help
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Enable NUMA emulation. A flat machine will be split
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into virtual nodes when booted with "numa=fake=N", where N is the
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number of nodes. This is only useful for debugging.
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config DISCONTIGMEM
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bool
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depends on NUMA
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default y
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config NUMA
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bool
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default n
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config HAVE_DEC_LOCK
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bool
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depends on SMP
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default y
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config NR_CPUS
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int "Maximum number of CPUs (2-256)"
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range 2 256
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depends on SMP
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default "8"
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help
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This allows you to specify the maximum number of CPUs which this
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kernel will support. Current maximum is 256 CPUs due to
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APIC addressing limits. Less depending on the hardware.
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This is purely to save memory - each supported CPU requires
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memory in the static kernel configuration.
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config HPET_TIMER
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bool
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default y
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help
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Use the IA-PC HPET (High Precision Event Timer) to manage
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time in preference to the PIT and RTC, if a HPET is
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present. The HPET provides a stable time base on SMP
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systems, unlike the TSC, but it is more expensive to access,
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as it is off-chip. You can find the HPET spec at
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<http://www.intel.com/labs/platcomp/hpet/hpetspec.htm>.
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config HPET_EMULATE_RTC
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bool "Provide RTC interrupt"
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depends on HPET_TIMER && RTC=y
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config GART_IOMMU
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bool "IOMMU support"
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depends on PCI
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help
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Support the K8 IOMMU. Needed to run systems with more than 4GB of memory
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properly with 32-bit PCI devices that do not support DAC (Double Address
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Cycle). The IOMMU can be turned off at runtime with the iommu=off parameter.
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Normally the kernel will take the right choice by itself.
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If unsure, say Y.
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# need this always enabled with GART_IOMMU for the VIA workaround
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config SWIOTLB
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bool
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depends on GART_IOMMU
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default y
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config DUMMY_IOMMU
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bool
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depends on !GART_IOMMU && !SWIOTLB
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default y
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help
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Don't use IOMMU code. This will cause problems when you have more than 4GB
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of memory and any 32-bit devices. Don't turn on unless you know what you
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are doing.
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config X86_MCE
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bool "Machine check support" if EMBEDDED
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default y
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help
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Include a machine check error handler to report hardware errors.
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This version will require the mcelog utility to decode some
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machine check error logs. See
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ftp://ftp.x86-64.org/pub/linux/tools/mcelog
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config X86_MCE_INTEL
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bool "Intel MCE features"
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depends on X86_MCE && X86_LOCAL_APIC
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default y
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help
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Additional support for intel specific MCE features such as
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the thermal monitor.
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config SECCOMP
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bool "Enable seccomp to safely compute untrusted bytecode"
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depends on PROC_FS
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default y
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help
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This kernel feature is useful for number crunching applications
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that may need to compute untrusted bytecode during their
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execution. By using pipes or other transports made available to
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the process as file descriptors supporting the read/write
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syscalls, it's possible to isolate those applications in
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their own address space using seccomp. Once seccomp is
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enabled via /proc/<pid>/seccomp, it cannot be disabled
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and the task is only allowed to execute a few safe syscalls
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defined by each seccomp mode.
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If unsure, say Y. Only embedded should say N here.
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endmenu
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#
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# Use the generic interrupt handling code in kernel/irq/:
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#
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config GENERIC_HARDIRQS
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bool
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default y
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config GENERIC_IRQ_PROBE
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bool
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default y
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# we have no ISA slots, but we do have ISA-style DMA.
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config ISA_DMA_API
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bool
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default y
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menu "Power management options"
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source kernel/power/Kconfig
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source "drivers/acpi/Kconfig"
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source "arch/x86_64/kernel/cpufreq/Kconfig"
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endmenu
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menu "Bus options (PCI etc.)"
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config PCI
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bool "PCI support"
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# x86-64 doesn't support PCI BIOS access from long mode so always go direct.
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config PCI_DIRECT
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bool
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depends on PCI
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default y
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config PCI_MMCONFIG
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bool "Support mmconfig PCI config space access"
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depends on PCI
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select ACPI_BOOT
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config UNORDERED_IO
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bool "Unordered IO mapping access"
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depends on EXPERIMENTAL
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help
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Use unordered stores to access IO memory mappings in device drivers.
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Still very experimental. When a driver works on IA64/ppc64/pa-risc it should
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work with this option, but it makes the drivers behave differently
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from i386. Requires that the driver writer used memory barriers
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properly.
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source "drivers/pci/pcie/Kconfig"
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source "drivers/pci/Kconfig"
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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 "Executable file formats / Emulations"
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source "fs/Kconfig.binfmt"
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config IA32_EMULATION
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bool "IA32 Emulation"
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help
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Include code to run 32-bit programs under a 64-bit kernel. You should likely
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turn this on, unless you're 100% sure that you don't have any 32-bit programs
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left.
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config IA32_AOUT
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bool "IA32 a.out support"
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depends on IA32_EMULATION
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help
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Support old a.out binaries in the 32bit emulation.
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config COMPAT
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bool
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depends on IA32_EMULATION
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default y
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config SYSVIPC_COMPAT
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bool
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depends on COMPAT && SYSVIPC
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default y
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config UID16
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bool
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depends on IA32_EMULATION
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default y
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endmenu
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source drivers/Kconfig
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source "drivers/firmware/Kconfig"
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source fs/Kconfig
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source "arch/x86_64/oprofile/Kconfig"
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source "arch/x86_64/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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