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Paul Mackerras14cf11a2005-09-26 16:04:21 +10001menu "Kernel hacking"
2
3source "lib/Kconfig.debug"
4
Paul Mackerrasff642082005-10-10 22:15:52 +10005config DEBUG_STACKOVERFLOW
6 bool "Check for stack overflows"
Kumar Gala304df8f2007-01-30 00:45:56 -06007 depends on DEBUG_KERNEL
Paul Mackerrasff642082005-10-10 22:15:52 +10008 help
9 This option will cause messages to be printed if free stack space
10 drops below a certain limit.
11
Paul Mackerrasff642082005-10-10 22:15:52 +100012config DEBUG_STACK_USAGE
13 bool "Stack utilization instrumentation"
Kumar Gala304df8f2007-01-30 00:45:56 -060014 depends on DEBUG_KERNEL
Paul Mackerrasff642082005-10-10 22:15:52 +100015 help
16 Enables the display of the minimum amount of free stack which each
17 task has ever had available in the sysrq-T and sysrq-P debug output.
18
19 This option will slow down process creation somewhat.
20
Benjamin Herrenschmidt88df6e92007-04-12 15:30:22 +100021config DEBUG_PAGEALLOC
22 bool "Debug page memory allocations"
Rafael J. Wysockib0cb1a12007-07-29 23:24:36 +020023 depends on DEBUG_KERNEL && !HIBERNATION
Benjamin Herrenschmidt88df6e92007-04-12 15:30:22 +100024 help
25 Unmap pages from the kernel linear mapping after free_pages().
26 This results in a large slowdown, but helps to find certain types
27 of memory corruptions.
28
29
Mike Kravetz57852a82006-09-06 16:23:12 -070030config HCALL_STATS
31 bool "Hypervisor call instrumentation"
32 depends on PPC_PSERIES && DEBUG_FS
33 help
34 Adds code to keep track of the number of hypervisor calls made and
David Sterba3dde6ad2007-05-09 07:12:20 +020035 the amount of time spent in hypervisor calls. Wall time spent in
Mike Kravetz57852a82006-09-06 16:23:12 -070036 each call is always calculated, and if available CPU cycles spent
37 are also calculated. A directory named hcall_inst is added at the
38 root of the debugfs filesystem. Within the hcall_inst directory
39 are files that contain CPU specific call statistics.
40
41 This option will add a small amount of overhead to all hypervisor
42 calls.
43
Paul Mackerrasff642082005-10-10 22:15:52 +100044config DEBUGGER
45 bool "Enable debugger hooks"
46 depends on DEBUG_KERNEL
47 help
48 Include in-kernel hooks for kernel debuggers. Unless you are
49 intending to debug the kernel, say N here.
50
Paul Mackerras14cf11a2005-09-26 16:04:21 +100051config KGDB
52 bool "Include kgdb kernel debugger"
Paul Mackerrasff642082005-10-10 22:15:52 +100053 depends on DEBUGGER && (BROKEN || PPC_GEN550 || 4xx)
Paul Mackerras14cf11a2005-09-26 16:04:21 +100054 select DEBUG_INFO
55 help
56 Include in-kernel hooks for kgdb, the Linux kernel source level
57 debugger. See <http://kgdb.sourceforge.net/> for more information.
58 Unless you are intending to debug the kernel, say N here.
59
Michael Ellermanae0dc732008-06-24 11:32:32 +100060config CODE_PATCHING_SELFTEST
61 bool "Run self-tests of the code-patching code."
62 depends on DEBUG_KERNEL
63 default n
64
Michael Ellerman362e7702008-06-24 11:33:03 +100065config FTR_FIXUP_SELFTEST
66 bool "Run self-tests of the feature-fixup code."
67 depends on DEBUG_KERNEL
68 default n
69
Paul Mackerras14cf11a2005-09-26 16:04:21 +100070choice
71 prompt "Serial Port"
72 depends on KGDB
73 default KGDB_TTYS1
74
75config KGDB_TTYS0
76 bool "ttyS0"
77
78config KGDB_TTYS1
79 bool "ttyS1"
80
81config KGDB_TTYS2
82 bool "ttyS2"
83
84config KGDB_TTYS3
85 bool "ttyS3"
86
87endchoice
88
89config KGDB_CONSOLE
90 bool "Enable serial console thru kgdb port"
91 depends on KGDB && 8xx || CPM2
92 help
93 If you enable this, all serial console messages will be sent
94 over the gdb stub.
95 If unsure, say N.
96
97config XMON
98 bool "Include xmon kernel debugger"
Stephen Rothwellbbb68172006-11-30 11:44:09 +110099 depends on DEBUGGER
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000100 help
101 Include in-kernel hooks for the xmon kernel monitor/debugger.
102 Unless you are intending to debug the kernel, say N here.
Paul Mackerrasff642082005-10-10 22:15:52 +1000103 Make sure to enable also CONFIG_BOOTX_TEXT on Macs. Otherwise
104 nothing will appear on the screen (xmon writes directly to the
105 framebuffer memory).
106 The cmdline option 'xmon' or 'xmon=early' will drop into xmon
107 very early during boot. 'xmon=on' will just enable the xmon
108 debugger hooks. 'xmon=off' will disable the debugger hooks
109 if CONFIG_XMON_DEFAULT is set.
Olaf Hering26c8af52006-09-08 16:29:21 +0200110 xmon will print a backtrace on the very first invocation.
111 'xmon=nobt' will disable this autobacktrace.
Paul Mackerrasff642082005-10-10 22:15:52 +1000112
113config XMON_DEFAULT
114 bool "Enable xmon by default"
115 depends on XMON
116 help
117 xmon is normally disabled unless booted with 'xmon=on'.
118 Use 'xmon=off' to disable xmon init during runtime.
119
Michael Ellermane0426042006-11-23 00:46:45 +0100120config XMON_DISASSEMBLY
121 bool "Include disassembly support in xmon"
122 depends on XMON
123 default y
124 help
125 Include support for disassembling in xmon. You probably want
126 to say Y here, unless you're building for a memory-constrained
127 system.
128
Paul Mackerrasff642082005-10-10 22:15:52 +1000129config IRQSTACKS
130 bool "Use separate kernel stacks when processing interrupts"
Paul Mackerrasff642082005-10-10 22:15:52 +1000131 help
132 If you say Y here the kernel will use separate kernel stacks
133 for handling hard and soft interrupts. This can help avoid
134 overflowing the process kernel stacks.
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000135
Michael Ellerman60b332e2007-08-28 18:47:57 +1000136config VIRQ_DEBUG
137 bool "Expose hardware/virtual IRQ mapping via debugfs"
138 depends on DEBUG_FS && PPC_MERGE
139 help
140 This option will show the mapping relationship between hardware irq
141 numbers and virtual irq numbers. The mapping is exposed via debugfs
142 in the file powerpc/virq_mapping.
143
144 If you don't know what this means you don't need it.
145
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000146config BDI_SWITCH
147 bool "Include BDI-2000 user context switcher"
Paul Mackerrasff642082005-10-10 22:15:52 +1000148 depends on DEBUG_KERNEL && PPC32
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000149 help
150 Include in-kernel support for the Abatron BDI2000 debugger.
151 Unless you are intending to debug the kernel with one of these
152 machines, say N here.
153
154config BOOTX_TEXT
155 bool "Support for early boot text console (BootX or OpenFirmware only)"
Adrian Bunk247537b2007-09-26 20:02:52 +0200156 depends on PPC_OF && PPC_MULTIPLATFORM
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000157 help
158 Say Y here to see progress messages from the boot firmware in text
159 mode. Requires either BootX or Open Firmware.
160
Michael Ellerman485a2d52006-05-09 16:03:51 +1000161config PPC_EARLY_DEBUG
162 bool "Early debugging (dangerous)"
Hollis Blanchardbbf45ba2008-04-16 23:28:09 -0500163 # PPC_EARLY_DEBUG on 440 leaves AS=1 mappings above the TLB high water
164 # mark, which doesn't work with current 440 KVM.
165 depends on !KVM
Benjamin Herrenschmidt7ee17462007-12-11 14:48:24 +1100166 help
167 Say Y to enable some early debugging facilities that may be available
168 for your processor/board combination. Those facilities are hacks
169 intended to debug problems early during boot, this should not be
170 enabled in a production kernel.
171 Note that enabling this will also cause the kernel default log level
172 to be pushed to max automatically very early during boot
Michael Ellerman485a2d52006-05-09 16:03:51 +1000173
Michael Ellerman296167a2006-01-11 11:54:09 +1100174choice
Michael Ellerman485a2d52006-05-09 16:03:51 +1000175 prompt "Early debugging console"
176 depends on PPC_EARLY_DEBUG
Michael Ellerman296167a2006-01-11 11:54:09 +1100177 help
Michael Ellerman485a2d52006-05-09 16:03:51 +1000178 Use the selected console for early debugging. Careful, if you
179 enable debugging for the wrong type of machine your kernel
180 _will not boot_.
Michael Ellerman296167a2006-01-11 11:54:09 +1100181
182config PPC_EARLY_DEBUG_LPAR
183 bool "LPAR HV Console"
184 depends on PPC_PSERIES
185 help
186 Select this to enable early debugging for a machine with a HVC
187 console on vterm 0.
188
189config PPC_EARLY_DEBUG_G5
190 bool "Apple G5"
191 depends on PPC_PMAC64
192 help
193 Select this to enable early debugging for Apple G5 machines.
194
Michael Ellermancc46bb92006-06-23 18:20:16 +1000195config PPC_EARLY_DEBUG_RTAS_PANEL
Michael Ellerman296167a2006-01-11 11:54:09 +1100196 bool "RTAS Panel"
197 depends on PPC_RTAS
198 help
199 Select this to enable early debugging via the RTAS panel.
200
Michael Ellermancc46bb92006-06-23 18:20:16 +1000201config PPC_EARLY_DEBUG_RTAS_CONSOLE
202 bool "RTAS Console"
203 depends on PPC_RTAS
204 select UDBG_RTAS_CONSOLE
205 help
206 Select this to enable early debugging via the RTAS console.
207
Michael Ellerman296167a2006-01-11 11:54:09 +1100208config PPC_EARLY_DEBUG_MAPLE
209 bool "Maple real mode"
210 depends on PPC_MAPLE
211 help
212 Select this to enable early debugging for Maple.
213
214config PPC_EARLY_DEBUG_ISERIES
215 bool "iSeries HV Console"
216 depends on PPC_ISERIES
217 help
218 Select this to enable early debugging for legacy iSeries. You need
219 to hit "Ctrl-x Ctrl-x" to see the messages on the console.
220
Olof Johansson39c870d2007-02-04 16:36:49 -0600221config PPC_EARLY_DEBUG_PAS_REALMODE
222 bool "PA Semi real mode"
223 depends on PPC_PASEMI
224 help
225 Select this to enable early debugging for PA Semi.
226 Output will be on UART0.
227
Ishizaki Kouc347b792007-02-02 16:47:17 +0900228config PPC_EARLY_DEBUG_BEAT
229 bool "Beat HV Console"
230 depends on PPC_CELLEB
231 select PPC_UDBG_BEAT
232 help
233 Select this to enable early debugging for Celleb with Beat.
234
David Gibsond9b55a02007-05-08 12:59:31 +1000235config PPC_EARLY_DEBUG_44x
236 bool "Early serial debugging for IBM/AMCC 44x CPUs"
237 depends on 44x
David Gibsond9b55a02007-05-08 12:59:31 +1000238 help
239 Select this to enable early debugging for IBM 44x chips via the
Hugh Blemings6bbc5472007-12-21 15:39:28 +1100240 inbuilt serial port. If you enable this, ensure you set
241 PPC_EARLY_DEBUG_44x_PHYSLOW below to suit your target board.
David Gibsond9b55a02007-05-08 12:59:31 +1000242
Benjamin Herrenschmidt9dae8af2007-12-21 15:39:26 +1100243config PPC_EARLY_DEBUG_40x
244 bool "Early serial debugging for IBM/AMCC 40x CPUs"
245 depends on 40x
246 help
247 Select this to enable early debugging for IBM 40x chips via the
248 inbuilt serial port. This works on chips with a 16550 compatible
249 UART. Xilinx chips with uartlite cannot use this option.
250
Scott Woodc374e002007-07-16 11:43:43 -0500251config PPC_EARLY_DEBUG_CPM
252 bool "Early serial debugging for Freescale CPM-based serial ports"
253 depends on SERIAL_CPM
254 select PIN_TLB if PPC_8xx
255 help
256 Select this to enable early debugging for Freescale chips
257 using a CPM-based serial port. This assumes that the bootwrapper
258 has run, and set up the CPM in a particular way.
259
Michael Ellerman296167a2006-01-11 11:54:09 +1100260endchoice
261
David Gibsond9b55a02007-05-08 12:59:31 +1000262config PPC_EARLY_DEBUG_44x_PHYSLOW
263 hex "Low 32 bits of early debug UART physical address"
Adrian Bunk247537b2007-09-26 20:02:52 +0200264 depends on PPC_EARLY_DEBUG_44x
David Gibsond9b55a02007-05-08 12:59:31 +1000265 default "0x40000200"
Hugh Blemings6bbc5472007-12-21 15:39:28 +1100266 help
267 You probably want 0x40000200 for ebony boards and
268 0x40000300 for taishan
David Gibsond9b55a02007-05-08 12:59:31 +1000269
270config PPC_EARLY_DEBUG_44x_PHYSHIGH
271 hex "EPRN of early debug UART physical address"
Adrian Bunk247537b2007-09-26 20:02:52 +0200272 depends on PPC_EARLY_DEBUG_44x
David Gibsond9b55a02007-05-08 12:59:31 +1000273 default "0x1"
274
Benjamin Herrenschmidt9dae8af2007-12-21 15:39:26 +1100275config PPC_EARLY_DEBUG_40x_PHYSADDR
276 hex "Early debug UART physical address"
277 depends on PPC_EARLY_DEBUG_40x
278 default "0xef600300"
279
Scott Woodc374e002007-07-16 11:43:43 -0500280config PPC_EARLY_DEBUG_CPM_ADDR
281 hex "CPM UART early debug transmit descriptor address"
282 depends on PPC_EARLY_DEBUG_CPM
Scott Wood15f8c602007-09-28 14:06:16 -0500283 default "0xfa202008" if PPC_EP88XC
Laurent Pinchartc2dd3522008-04-10 17:01:59 +0200284 default "0xf0001ff8" if CPM2
Scott Wood15f8c602007-09-28 14:06:16 -0500285 default "0xff002008" if CPM1
Scott Woodc374e002007-07-16 11:43:43 -0500286 help
287 This specifies the address of the transmit descriptor
288 used for early debug output. Because it is needed before
289 platform probing is done, all platforms selected must
290 share the same address.
291
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000292endmenu