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authorLinus Torvalds2005-04-17 00:20:36 +0200
committerLinus Torvalds2005-04-17 00:20:36 +0200
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/um/Kconfig
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Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
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+# UML uses the generic IRQ sugsystem
+config GENERIC_HARDIRQS
+ bool
+ default y
+
+config UML
+ bool
+ default y
+
+# XXX: does UM have a mmu/swap?
+config MMU
+ bool
+ default y
+
+mainmenu "Linux/Usermode Kernel Configuration"
+
+config ISA
+ bool
+
+config SBUS
+ bool
+
+config PCI
+ bool
+
+config UID16
+ bool
+ default y
+
+config RWSEM_GENERIC_SPINLOCK
+ bool
+ default y
+
+config GENERIC_CALIBRATE_DELAY
+ bool
+ default y
+
+menu "UML-specific options"
+
+config MODE_TT
+ bool "Tracing thread support"
+ default y
+ help
+ This option controls whether tracing thread support is compiled
+ into UML. Normally, this should be set to Y. If you intend to
+ use only skas mode (and the host has the skas patch applied to it),
+ then it is OK to say N here.
+
+config STATIC_LINK
+ bool "Force a static link"
+ default n
+ depends on !MODE_TT
+ help
+ If CONFIG_MODE_TT is disabled, then this option gives you the ability
+ to force a static link of UML. Normally, if only skas mode is built
+ in to UML, it will be linked as a shared binary. This is inconvenient
+ for use in a chroot jail. So, if you intend to run UML inside a
+ chroot, and you disable CONFIG_MODE_TT, you probably want to say Y
+ here.
+
+config MODE_SKAS
+ bool "Separate Kernel Address Space support"
+ default y
+ help
+ This option controls whether skas (separate kernel address space)
+ support is compiled in. If you have applied the skas patch to the
+ host, then you certainly want to say Y here (and consider saying N
+ to CONFIG_MODE_TT). Otherwise, it is safe to say Y. Disabling this
+ option will shrink the UML binary slightly.
+
+source "arch/um/Kconfig_arch"
+
+config LD_SCRIPT_STATIC
+ bool
+ default y
+ depends on MODE_TT || 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 BROKEN
+ 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.
+
+ If you are actively using it, please ask for it to be fixed. In this
+ moment, it does not work on 2.6 (it works somehow on 2.4).
+
+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 HOST_2G_2G
+ bool "2G/2G host address space split"
+ default n
+ help
+ This is needed when the host on which you run has a 2G/2G memory
+ split, instead of the customary 3G/1G.
+
+ Note that to enable such a host
+ configuration, which makes sense only in some cases, you need special
+ host patches.
+
+ So, if you do not know what to do here, say 'N'.
+
+config SMP
+ bool "Symmetric multi-processing support (EXPERIMENTAL)"
+ default n
+ depends on MODE_TT && EXPERIMENTAL
+ 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.
+
+ Note that if the hosting UML has its CONFIG_KERNEL_HALF_GIGS set to
+ greater than one, then the guest UML should have its CONFIG_NEST_LEVEL
+ set to the host's CONFIG_NEST_LEVEL + CONFIG_KERNEL_HALF_GIGS.
+ Only change this if you are running nested UMLs.
+
+config KERNEL_HALF_GIGS
+ int "Kernel address space size (in .5G units)"
+ default "1"
+ help
+ This determines the amount of address space that UML will allocate for
+ its own, measured in half Gigabyte units. The default is 1.
+ Change this only if you need to boot UML with an unusually large amount
+ of physical memory.
+
+config HIGHMEM
+ bool "Highmem support"
+
+config KERNEL_STACK_ORDER
+ int "Kernel stack size order"
+ default 2
+ 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
+ noticable lag. If this is a problem, then disable this option.
+
+endmenu
+
+source "init/Kconfig"
+
+source "drivers/base/Kconfig"
+
+source "arch/um/Kconfig_char"
+
+source "drivers/block/Kconfig"
+
+config NETDEVICES
+ bool
+ default NET
+
+source "arch/um/Kconfig_net"
+
+source "net/Kconfig"
+
+source "fs/Kconfig"
+
+source "security/Kconfig"
+
+source "crypto/Kconfig"
+
+source "lib/Kconfig"
+
+menu "SCSI support"
+depends on BROKEN
+
+config SCSI
+ tristate "SCSI support"
+
+# This gives us free_dma, which scsi.c wants.
+config GENERIC_ISA_DMA
+ bool
+ depends on SCSI
+ default y
+
+source "arch/um/Kconfig_scsi"
+
+endmenu
+
+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"