uml: GENERIC_TIME support

[linux.git] / arch / um / Kconfig

config DEFCONFIG_LIST
	string
	option defconfig_list
	default "arch/$ARCH/defconfig"

# UML uses the generic IRQ sugsystem
config GENERIC_HARDIRQS
	bool
	default y

config UML
	bool
	default y

config MMU
	bool
	default y

config NO_IOMEM
	def_bool y

mainmenu "Linux/Usermode Kernel Configuration"

config ISA
	bool

config SBUS
	bool

config PCI
	bool

config PCMCIA
	bool

# Yet to do!
config TRACE_IRQFLAGS_SUPPORT
	bool
	default n

config LOCKDEP_SUPPORT
	bool
	default y

config STACKTRACE_SUPPORT
	bool
	default n

config GENERIC_CALIBRATE_DELAY
	bool
	default y

config GENERIC_BUG
	bool
	default y
	depends on BUG

config GENERIC_TIME
	bool
	default y

# Used in kernel/irq/manage.c and include/linux/irq.h
config IRQ_RELEASE_METHOD
	bool
	default y

menu "UML-specific options"

config STATIC_LINK
	bool "Force a static link"
	default n
	help
	  This option gives you the ability to force a static link of UML.
	  Normally, UML is linked as a shared binary.  This is inconvenient for
	  use in a chroot jail.  So, if you intend to run UML inside a chroot,
	  you probably want to say Y here.
	  Additionally, this option enables using higher memory spaces (up to
	  2.75G) for UML.

source "arch/um/Kconfig.arch"
source "mm/Kconfig"
source "kernel/time/Kconfig"

config LD_SCRIPT_STATIC
	bool
	default y
	depends on STATIC_LINK

config LD_SCRIPT_DYN
	bool
	default y
	depends on !LD_SCRIPT_STATIC

config NET
	bool "Networking support"
	help
	  Unless you really know what you are doing, you should say Y here.
	  The reason is that some programs need kernel networking support even
	  when running on a stand-alone machine that isn't connected to any
	  other computer. If you are upgrading from an older kernel, you
	  should consider updating your networking tools too because changes
	  in the kernel and the tools often go hand in hand. The tools are
	  contained in the package net-tools, the location and version number
	  of which are given in <file:Documentation/Changes>.

	  For a general introduction to Linux networking, it is highly
	  recommended to read the NET-HOWTO, available from
	  <http://www.tldp.org/docs.html#howto>.


source "fs/Kconfig.binfmt"

config HOSTFS
	tristate "Host filesystem"
	help
          While the User-Mode Linux port uses its own root file system for
          booting and normal file access, this module lets the UML user
          access files stored on the host.  It does not require any
          network connection between the Host and UML.  An example use of
          this might be:

          mount none /tmp/fromhost -t hostfs -o /tmp/umlshare

          where /tmp/fromhost is an empty directory inside UML and
          /tmp/umlshare is a directory on the host with files the UML user
          wishes to access.

          For more information, see
          <http://user-mode-linux.sourceforge.net/hostfs.html>.

          If you'd like to be able to work with files stored on the host,
          say Y or M here; otherwise say N.

config HPPFS
	tristate "HoneyPot ProcFS (EXPERIMENTAL)"
	depends on EXPERIMENTAL
	help
	  hppfs (HoneyPot ProcFS) is a filesystem which allows UML /proc
	  entries to be overridden, removed, or fabricated from the host.
	  Its purpose is to allow a UML to appear to be a physical machine
	  by removing or changing anything in /proc which gives away the
	  identity of a UML.

	  See <http://user-mode-linux.sf.net/hppfs.html> for more information.

	  You only need this if you are setting up a UML honeypot.  Otherwise,
	  it is safe to say 'N' here.

config MCONSOLE
	bool "Management console"
	default y
	help
          The user mode linux management console is a low-level interface to
          the kernel, somewhat like the i386 SysRq interface.  Since there is
          a full-blown operating system running under every user mode linux
          instance, there is much greater flexibility possible than with the
          SysRq mechanism.

          If you answer 'Y' to this option, to use this feature, you need the
          mconsole client (called uml_mconsole) which is present in CVS in
          2.4.5-9um and later (path /tools/mconsole), and is also in the
          distribution RPM package in 2.4.6 and later.

          It is safe to say 'Y' here.

config MAGIC_SYSRQ
	bool "Magic SysRq key"
	depends on MCONSOLE
	help
	  If you say Y here, you will have some control over the system even
	  if the system crashes for example during kernel debugging (e.g., you
	  will be able to flush the buffer cache to disk, reboot the system
	  immediately or dump some status information). A key for each of the
	  possible requests is provided.

	  This is the feature normally accomplished by pressing a key
	  while holding SysRq (Alt+PrintScreen).

	  On UML, this is accomplished by sending a "sysrq" command with
	  mconsole, followed by the letter for the requested command.

	  The keys are documented in <file:Documentation/sysrq.txt>. Don't say Y
	  unless you really know what this hack does.

config SMP
	bool "Symmetric multi-processing support (EXPERIMENTAL)"
	default n
	#SMP_BROKEN is for x86_64.
	depends on EXPERIMENTAL && (!SMP_BROKEN || (BROKEN && SMP_BROKEN))
	help
	  This option enables UML SMP support.
	  It is NOT related to having a real SMP box. Not directly, at least.

	  UML implements virtual SMP by allowing as many processes to run
	  simultaneously on the host as there are virtual processors configured.

	  Obviously, if the host is a uniprocessor, those processes will
	  timeshare, but, inside UML, will appear to be running simultaneously.
	  If the host is a multiprocessor, then UML processes may run
	  simultaneously, depending on the host scheduler.

	  This, however, is supported only in TT mode. So, if you use the SKAS
	  patch on your host, switching to TT mode and enabling SMP usually
	  gives	you worse performances.
	  Also, since the support for SMP has been under-developed, there could
	  be some bugs being exposed by enabling SMP.

	  If you don't know what to do, say N.

config NR_CPUS
	int "Maximum number of CPUs (2-32)"
	range 2 32
	depends on SMP
	default "32"

config NEST_LEVEL
	int "Nesting level"
	default "0"
	help
          This is set to the number of layers of UMLs that this UML will be run
          in.  Normally, this is zero, meaning that it will run directly on the
          host.  Setting it to one will build a UML that can run inside a UML
          that is running on the host.  Generally, if you intend this UML to run
          inside another UML, set CONFIG_NEST_LEVEL to one more than the host
          UML.

config HIGHMEM
	bool "Highmem support (EXPERIMENTAL)"
	depends on !64BIT && EXPERIMENTAL
	default n
	help
	  This was used to allow UML to run with big amounts of memory.
	  Currently it is unstable, so if unsure say N.

	  To use big amounts of memory, it is recommended enable static
	  linking (i.e. CONFIG_STATIC_LINK) - this should allow the
	  guest to use up to 2.75G of memory.

config KERNEL_STACK_ORDER
	int "Kernel stack size order"
	default 1 if 64BIT
	range 1 10 if 64BIT
	default 0 if !64BIT
	help
	  This option determines the size of UML kernel stacks.  They will
	  be 1 << order pages.  The default is OK unless you're running Valgrind
	  on UML, in which case, set this to 3.

config UML_REAL_TIME_CLOCK
	bool "Real-time Clock"
	default y
	help
	  This option makes UML time deltas match wall clock deltas.  This
	  should normally be enabled.  The exception would be if you are
	  debugging with UML and spend long times with UML stopped at a
	  breakpoint.  In this case, when UML is restarted, it will call the
	  timer enough times to make up for the time spent at the breakpoint.
	  This could result in a noticeable lag.  If this is a problem, then
	  disable this option.

endmenu

source "init/Kconfig"

source "drivers/block/Kconfig"

source "arch/um/Kconfig.char"

source "drivers/base/Kconfig"

source "net/Kconfig"

source "arch/um/Kconfig.net"

source "drivers/net/Kconfig"

source "drivers/connector/Kconfig"

source "fs/Kconfig"

source "security/Kconfig"

source "crypto/Kconfig"

source "lib/Kconfig"

source "drivers/scsi/Kconfig"

source "drivers/md/Kconfig"

if BROKEN
	source "drivers/mtd/Kconfig"
endif

#This is just to shut up some Kconfig warnings, so no prompt.
config INPUT
	bool
	default n

source "arch/um/Kconfig.debug"