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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 MCONSOLE
 48         bool "Management console"
 49         depends on PROC_FS
 50         default y
 51         help
 52           The user mode linux management console is a low-level interface to
 53           the kernel, somewhat like the i386 SysRq interface.  Since there is
 54           a full-blown operating system running under every user mode linux
 55           instance, there is much greater flexibility possible than with the
 56           SysRq mechanism.
 57 
 58           If you answer 'Y' to this option, to use this feature, you need the
 59           mconsole client (called uml_mconsole) which is present in CVS in
 60           2.4.5-9um and later (path /tools/mconsole), and is also in the
 61           distribution RPM package in 2.4.6 and later.
 62 
 63           It is safe to say 'Y' here.
 64 
 65 config MAGIC_SYSRQ
 66         bool "Magic SysRq key"
 67         depends on MCONSOLE
 68         help
 69           If you say Y here, you will have some control over the system even
 70           if the system crashes for example during kernel debugging (e.g., you
 71           will be able to flush the buffer cache to disk, reboot the system
 72           immediately or dump some status information). A key for each of the
 73           possible requests is provided.
 74 
 75           This is the feature normally accomplished by pressing a key
 76           while holding SysRq (Alt+PrintScreen).
 77 
 78           On UML, this is accomplished by sending a "sysrq" command with
 79           mconsole, followed by the letter for the requested command.
 80 
 81           The keys are documented in <file:Documentation/sysrq.txt>. Don't say Y
 82           unless you really know what this hack does.
 83 
 84 config KERNEL_STACK_ORDER
 85         int "Kernel stack size order"
 86         default 1 if 64BIT
 87         range 1 10 if 64BIT
 88         default 0 if !64BIT
 89         help
 90           This option determines the size of UML kernel stacks.  They will
 91           be 1 << order pages.  The default is OK unless you're running Valgrind
 92           on UML, in which case, set this to 3.
 93 
 94 config MMAPPER
 95         tristate "iomem emulation driver"
 96         help
 97           This driver allows a host file to be used as emulated IO memory inside
 98           UML.
 99 
100 config NO_DMA
101         def_bool y
102 
103 config PGTABLE_LEVELS
104         int
105         default 3 if 3_LEVEL_PGTABLES
106         default 2

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