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Linux/arch/um/Kconfig.um

  1 config STATIC_LINK
  2         bool "Force a static link"
  3         default n
  4         help
  5           This option gives you the ability to force a static link of UML.
  6           Normally, UML is linked as a shared binary.  This is inconvenient for
  7           use in a chroot jail.  So, if you intend to run UML inside a chroot,
  8           you probably want to say Y here.
  9           Additionally, this option enables using higher memory spaces (up to
 10           2.75G) for UML.
 11 
 12 source "mm/Kconfig"
 13 
 14 config LD_SCRIPT_STATIC
 15         bool
 16         default y
 17         depends on STATIC_LINK
 18 
 19 config LD_SCRIPT_DYN
 20         bool
 21         default y
 22         depends on !LD_SCRIPT_STATIC
 23 
 24 source "fs/Kconfig.binfmt"
 25 
 26 config HOSTFS
 27         tristate "Host filesystem"
 28         help
 29           While the User-Mode Linux port uses its own root file system for
 30           booting and normal file access, this module lets the UML user
 31           access files stored on the host.  It does not require any
 32           network connection between the Host and UML.  An example use of
 33           this might be:
 34 
 35           mount none /tmp/fromhost -t hostfs -o /tmp/umlshare
 36 
 37           where /tmp/fromhost is an empty directory inside UML and
 38           /tmp/umlshare is a directory on the host with files the UML user
 39           wishes to access.
 40 
 41           For more information, see
 42           <http://user-mode-linux.sourceforge.net/hostfs.html>.
 43 
 44           If you'd like to be able to work with files stored on the host,
 45           say Y or M here; otherwise say N.
 46 
 47 config HPPFS
 48         tristate "HoneyPot ProcFS"
 49         depends on PROC_FS
 50         help
 51           hppfs (HoneyPot ProcFS) is a filesystem which allows UML /proc
 52           entries to be overridden, removed, or fabricated from the host.
 53           Its purpose is to allow a UML to appear to be a physical machine
 54           by removing or changing anything in /proc which gives away the
 55           identity of a UML.
 56 
 57           See <http://user-mode-linux.sf.net/old/hppfs.html> for more information.
 58 
 59           You only need this if you are setting up a UML honeypot.  Otherwise,
 60           it is safe to say 'N' here.
 61 
 62 config MCONSOLE
 63         bool "Management console"
 64         default y
 65         help
 66           The user mode linux management console is a low-level interface to
 67           the kernel, somewhat like the i386 SysRq interface.  Since there is
 68           a full-blown operating system running under every user mode linux
 69           instance, there is much greater flexibility possible than with the
 70           SysRq mechanism.
 71 
 72           If you answer 'Y' to this option, to use this feature, you need the
 73           mconsole client (called uml_mconsole) which is present in CVS in
 74           2.4.5-9um and later (path /tools/mconsole), and is also in the
 75           distribution RPM package in 2.4.6 and later.
 76 
 77           It is safe to say 'Y' here.
 78 
 79 config MAGIC_SYSRQ
 80         bool "Magic SysRq key"
 81         depends on MCONSOLE
 82         help
 83           If you say Y here, you will have some control over the system even
 84           if the system crashes for example during kernel debugging (e.g., you
 85           will be able to flush the buffer cache to disk, reboot the system
 86           immediately or dump some status information). A key for each of the
 87           possible requests is provided.
 88 
 89           This is the feature normally accomplished by pressing a key
 90           while holding SysRq (Alt+PrintScreen).
 91 
 92           On UML, this is accomplished by sending a "sysrq" command with
 93           mconsole, followed by the letter for the requested command.
 94 
 95           The keys are documented in <file:Documentation/sysrq.txt>. Don't say Y
 96           unless you really know what this hack does.
 97 
 98 config KERNEL_STACK_ORDER
 99         int "Kernel stack size order"
100         default 1 if 64BIT
101         range 1 10 if 64BIT
102         default 0 if !64BIT
103         help
104           This option determines the size of UML kernel stacks.  They will
105           be 1 << order pages.  The default is OK unless you're running Valgrind
106           on UML, in which case, set this to 3.
107 
108 config MMAPPER
109         tristate "iomem emulation driver"
110         help
111           This driver allows a host file to be used as emulated IO memory inside
112           UML.
113 
114 config NO_DMA
115         def_bool y
116 
117 config PGTABLE_LEVELS
118         int
119         default 3 if 3_LEVEL_PGTABLES
120         default 2

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