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Linus Torvalds1da177e2005-04-16 15:20:36 -07001# UML uses the generic IRQ sugsystem
2config GENERIC_HARDIRQS
3 bool
4 default y
5
6config UML
7 bool
8 default y
9
10# XXX: does UM have a mmu/swap?
11config MMU
12 bool
13 default y
14
15mainmenu "Linux/Usermode Kernel Configuration"
16
17config ISA
18 bool
19
20config SBUS
21 bool
22
23config PCI
24 bool
25
26config UID16
27 bool
28 default y
29
30config RWSEM_GENERIC_SPINLOCK
31 bool
32 default y
33
34config GENERIC_CALIBRATE_DELAY
35 bool
36 default y
37
Paolo 'Blaisorblade' Giarrussob77d6ad2005-06-21 17:16:24 -070038# Used in kernel/irq/manage.c and include/linux/irq.h
39config IRQ_RELEASE_METHOD
40 bool
41 default y
42
Linus Torvalds1da177e2005-04-16 15:20:36 -070043menu "UML-specific options"
44
45config MODE_TT
46 bool "Tracing thread support"
47 default y
48 help
49 This option controls whether tracing thread support is compiled
50 into UML. Normally, this should be set to Y. If you intend to
51 use only skas mode (and the host has the skas patch applied to it),
52 then it is OK to say N here.
53
54config STATIC_LINK
55 bool "Force a static link"
56 default n
57 depends on !MODE_TT
58 help
59 If CONFIG_MODE_TT is disabled, then this option gives you the ability
60 to force a static link of UML. Normally, if only skas mode is built
61 in to UML, it will be linked as a shared binary. This is inconvenient
62 for use in a chroot jail. So, if you intend to run UML inside a
63 chroot, and you disable CONFIG_MODE_TT, you probably want to say Y
64 here.
65
66config MODE_SKAS
67 bool "Separate Kernel Address Space support"
68 default y
69 help
70 This option controls whether skas (separate kernel address space)
71 support is compiled in. If you have applied the skas patch to the
72 host, then you certainly want to say Y here (and consider saying N
73 to CONFIG_MODE_TT). Otherwise, it is safe to say Y. Disabling this
74 option will shrink the UML binary slightly.
75
76source "arch/um/Kconfig_arch"
Dave Hansen3f22ab22005-06-23 00:07:43 -070077source "mm/Kconfig"
Linus Torvalds1da177e2005-04-16 15:20:36 -070078
79config LD_SCRIPT_STATIC
80 bool
81 default y
82 depends on MODE_TT || STATIC_LINK
83
84config LD_SCRIPT_DYN
85 bool
86 default y
87 depends on !LD_SCRIPT_STATIC
88
89config NET
90 bool "Networking support"
91 help
92 Unless you really know what you are doing, you should say Y here.
93 The reason is that some programs need kernel networking support even
94 when running on a stand-alone machine that isn't connected to any
95 other computer. If you are upgrading from an older kernel, you
96 should consider updating your networking tools too because changes
97 in the kernel and the tools often go hand in hand. The tools are
98 contained in the package net-tools, the location and version number
99 of which are given in <file:Documentation/Changes>.
100
101 For a general introduction to Linux networking, it is highly
102 recommended to read the NET-HOWTO, available from
103 <http://www.tldp.org/docs.html#howto>.
104
105
106source "fs/Kconfig.binfmt"
107
108config HOSTFS
109 tristate "Host filesystem"
110 help
111 While the User-Mode Linux port uses its own root file system for
112 booting and normal file access, this module lets the UML user
113 access files stored on the host. It does not require any
114 network connection between the Host and UML. An example use of
115 this might be:
116
117 mount none /tmp/fromhost -t hostfs -o /tmp/umlshare
118
119 where /tmp/fromhost is an empty directory inside UML and
120 /tmp/umlshare is a directory on the host with files the UML user
121 wishes to access.
122
123 For more information, see
124 <http://user-mode-linux.sourceforge.net/hostfs.html>.
125
126 If you'd like to be able to work with files stored on the host,
127 say Y or M here; otherwise say N.
128
129config HPPFS
130 tristate "HoneyPot ProcFS (EXPERIMENTAL)"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 help
132 hppfs (HoneyPot ProcFS) is a filesystem which allows UML /proc
133 entries to be overridden, removed, or fabricated from the host.
134 Its purpose is to allow a UML to appear to be a physical machine
135 by removing or changing anything in /proc which gives away the
136 identity of a UML.
137
138 See <http://user-mode-linux.sf.net/hppfs.html> for more information.
139
140 You only need this if you are setting up a UML honeypot. Otherwise,
141 it is safe to say 'N' here.
142
Paolo 'Blaisorblade' Giarrusso3f580472005-07-07 17:56:51 -0700143 If you are actively using it, please report any problems, since it's
144 getting fixed. In this moment, it is experimental on 2.6 (it works on
145 2.4).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146
147config MCONSOLE
148 bool "Management console"
149 default y
150 help
151 The user mode linux management console is a low-level interface to
152 the kernel, somewhat like the i386 SysRq interface. Since there is
153 a full-blown operating system running under every user mode linux
154 instance, there is much greater flexibility possible than with the
155 SysRq mechanism.
156
157 If you answer 'Y' to this option, to use this feature, you need the
158 mconsole client (called uml_mconsole) which is present in CVS in
159 2.4.5-9um and later (path /tools/mconsole), and is also in the
160 distribution RPM package in 2.4.6 and later.
161
162 It is safe to say 'Y' here.
163
164config MAGIC_SYSRQ
165 bool "Magic SysRq key"
166 depends on MCONSOLE
167 ---help---
168 If you say Y here, you will have some control over the system even
169 if the system crashes for example during kernel debugging (e.g., you
170 will be able to flush the buffer cache to disk, reboot the system
171 immediately or dump some status information). A key for each of the
172 possible requests is provided.
173
174 This is the feature normally accomplished by pressing a key
175 while holding SysRq (Alt+PrintScreen).
176
177 On UML, this is accomplished by sending a "sysrq" command with
178 mconsole, followed by the letter for the requested command.
179
180 The keys are documented in <file:Documentation/sysrq.txt>. Don't say Y
181 unless you really know what this hack does.
182
183config HOST_2G_2G
184 bool "2G/2G host address space split"
185 default n
186 help
187 This is needed when the host on which you run has a 2G/2G memory
188 split, instead of the customary 3G/1G.
189
190 Note that to enable such a host
191 configuration, which makes sense only in some cases, you need special
192 host patches.
193
194 So, if you do not know what to do here, say 'N'.
195
196config SMP
197 bool "Symmetric multi-processing support (EXPERIMENTAL)"
198 default n
199 depends on MODE_TT && EXPERIMENTAL
200 help
201 This option enables UML SMP support.
202 It is NOT related to having a real SMP box. Not directly, at least.
203
204 UML implements virtual SMP by allowing as many processes to run
205 simultaneously on the host as there are virtual processors configured.
206
207 Obviously, if the host is a uniprocessor, those processes will
208 timeshare, but, inside UML, will appear to be running simultaneously.
209 If the host is a multiprocessor, then UML processes may run
210 simultaneously, depending on the host scheduler.
211
212 This, however, is supported only in TT mode. So, if you use the SKAS
213 patch on your host, switching to TT mode and enabling SMP usually gives
214 you worse performances.
215 Also, since the support for SMP has been under-developed, there could
216 be some bugs being exposed by enabling SMP.
217
218 If you don't know what to do, say N.
219
220config NR_CPUS
221 int "Maximum number of CPUs (2-32)"
222 range 2 32
223 depends on SMP
224 default "32"
225
226config NEST_LEVEL
227 int "Nesting level"
228 default "0"
229 help
230 This is set to the number of layers of UMLs that this UML will be run
231 in. Normally, this is zero, meaning that it will run directly on the
232 host. Setting it to one will build a UML that can run inside a UML
233 that is running on the host. Generally, if you intend this UML to run
234 inside another UML, set CONFIG_NEST_LEVEL to one more than the host
235 UML.
236
237 Note that if the hosting UML has its CONFIG_KERNEL_HALF_GIGS set to
238 greater than one, then the guest UML should have its CONFIG_NEST_LEVEL
239 set to the host's CONFIG_NEST_LEVEL + CONFIG_KERNEL_HALF_GIGS.
240 Only change this if you are running nested UMLs.
241
242config KERNEL_HALF_GIGS
243 int "Kernel address space size (in .5G units)"
244 default "1"
245 help
246 This determines the amount of address space that UML will allocate for
247 its own, measured in half Gigabyte units. The default is 1.
248 Change this only if you need to boot UML with an unusually large amount
249 of physical memory.
250
251config HIGHMEM
252 bool "Highmem support"
Paolo 'Blaisorblade' Giarrussoc45166b2005-05-01 08:58:54 -0700253 depends on !64BIT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254
255config KERNEL_STACK_ORDER
256 int "Kernel stack size order"
257 default 2
258 help
259 This option determines the size of UML kernel stacks. They will
260 be 1 << order pages. The default is OK unless you're running Valgrind
261 on UML, in which case, set this to 3.
262
263config UML_REAL_TIME_CLOCK
264 bool "Real-time Clock"
265 default y
266 help
267 This option makes UML time deltas match wall clock deltas. This should
268 normally be enabled. The exception would be if you are debugging with
269 UML and spend long times with UML stopped at a breakpoint. In this
270 case, when UML is restarted, it will call the timer enough times to make
271 up for the time spent at the breakpoint. This could result in a
272 noticable lag. If this is a problem, then disable this option.
273
274endmenu
275
276source "init/Kconfig"
277
Sam Ravnborgd5950b42005-07-11 21:03:49 -0700278source "net/Kconfig"
279
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280source "drivers/base/Kconfig"
281
282source "arch/um/Kconfig_char"
283
284source "drivers/block/Kconfig"
285
286config NETDEVICES
287 bool
288 default NET
289
290source "arch/um/Kconfig_net"
291
Sam Ravnborgd5950b42005-07-11 21:03:49 -0700292source "drivers/net/Kconfig"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293
294source "fs/Kconfig"
295
296source "security/Kconfig"
297
298source "crypto/Kconfig"
299
300source "lib/Kconfig"
301
302menu "SCSI support"
303depends on BROKEN
304
305config SCSI
306 tristate "SCSI support"
307
308# This gives us free_dma, which scsi.c wants.
309config GENERIC_ISA_DMA
310 bool
311 depends on SCSI
312 default y
313
314source "arch/um/Kconfig_scsi"
315
316endmenu
317
318source "drivers/md/Kconfig"
319
320if BROKEN
321 source "drivers/mtd/Kconfig"
322endif
323
324#This is just to shut up some Kconfig warnings, so no prompt.
325config INPUT
326 bool
327 default n
328
329source "arch/um/Kconfig.debug"