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Paul Mackerras14cf11a2005-09-26 16:04:21 +10001menu "Kernel hacking"
2
3source "lib/Kconfig.debug"
4
Johannes Bergc4d04be2008-11-20 03:24:07 +00005config PRINT_STACK_DEPTH
6 int "Stack depth to print" if DEBUG_KERNEL
7 default 64
8 help
9 This option allows you to set the stack depth that the kernel
10 prints in stack traces. This can be useful if your display is
11 too small and stack traces cause important information to
12 scroll off the screen.
13
Paul Mackerrasff642082005-10-10 22:15:52 +100014config DEBUG_STACKOVERFLOW
15 bool "Check for stack overflows"
Kumar Gala304df8f2007-01-30 00:45:56 -060016 depends on DEBUG_KERNEL
Paul Mackerrasff642082005-10-10 22:15:52 +100017 help
18 This option will cause messages to be printed if free stack space
19 drops below a certain limit.
20
Paul Mackerrasff642082005-10-10 22:15:52 +100021config DEBUG_STACK_USAGE
22 bool "Stack utilization instrumentation"
Kumar Gala304df8f2007-01-30 00:45:56 -060023 depends on DEBUG_KERNEL
Paul Mackerrasff642082005-10-10 22:15:52 +100024 help
25 Enables the display of the minimum amount of free stack which each
26 task has ever had available in the sysrq-T and sysrq-P debug output.
27
28 This option will slow down process creation somewhat.
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
Michael Ellermanae0dc732008-06-24 11:32:32 +100044config CODE_PATCHING_SELFTEST
45 bool "Run self-tests of the code-patching code."
46 depends on DEBUG_KERNEL
47 default n
48
Michael Ellerman362e7702008-06-24 11:33:03 +100049config FTR_FIXUP_SELFTEST
50 bool "Run self-tests of the feature-fixup code."
51 depends on DEBUG_KERNEL
52 default n
53
Michael Ellerman7e302862008-08-06 09:10:01 +100054config MSI_BITMAP_SELFTEST
55 bool "Run self-tests of the MSI bitmap code."
56 depends on DEBUG_KERNEL
57 default n
58
Paul Mackerras14cf11a2005-09-26 16:04:21 +100059config XMON
60 bool "Include xmon kernel debugger"
Jason Wessel17ce4522008-07-23 11:30:15 -050061 depends on DEBUG_KERNEL
Paul Mackerras14cf11a2005-09-26 16:04:21 +100062 help
63 Include in-kernel hooks for the xmon kernel monitor/debugger.
64 Unless you are intending to debug the kernel, say N here.
Paul Mackerrasff642082005-10-10 22:15:52 +100065 Make sure to enable also CONFIG_BOOTX_TEXT on Macs. Otherwise
66 nothing will appear on the screen (xmon writes directly to the
67 framebuffer memory).
68 The cmdline option 'xmon' or 'xmon=early' will drop into xmon
69 very early during boot. 'xmon=on' will just enable the xmon
70 debugger hooks. 'xmon=off' will disable the debugger hooks
71 if CONFIG_XMON_DEFAULT is set.
Olaf Hering26c8af52006-09-08 16:29:21 +020072 xmon will print a backtrace on the very first invocation.
73 'xmon=nobt' will disable this autobacktrace.
Paul Mackerrasff642082005-10-10 22:15:52 +100074
75config XMON_DEFAULT
76 bool "Enable xmon by default"
77 depends on XMON
78 help
79 xmon is normally disabled unless booted with 'xmon=on'.
80 Use 'xmon=off' to disable xmon init during runtime.
81
Michael Ellermane0426042006-11-23 00:46:45 +010082config XMON_DISASSEMBLY
83 bool "Include disassembly support in xmon"
84 depends on XMON
85 default y
86 help
87 Include support for disassembling in xmon. You probably want
88 to say Y here, unless you're building for a memory-constrained
89 system.
90
Jason Wessel17ce4522008-07-23 11:30:15 -050091config DEBUGGER
92 bool
93 depends on KGDB || XMON
94 default y
95
Paul Mackerrasff642082005-10-10 22:15:52 +100096config IRQSTACKS
97 bool "Use separate kernel stacks when processing interrupts"
Paul Mackerrasff642082005-10-10 22:15:52 +100098 help
99 If you say Y here the kernel will use separate kernel stacks
100 for handling hard and soft interrupts. This can help avoid
101 overflowing the process kernel stacks.
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000102
Michael Ellerman60b332e2007-08-28 18:47:57 +1000103config VIRQ_DEBUG
104 bool "Expose hardware/virtual IRQ mapping via debugfs"
Kumar Gala9c4cb822008-08-02 02:44:11 +1000105 depends on DEBUG_FS
Michael Ellerman60b332e2007-08-28 18:47:57 +1000106 help
107 This option will show the mapping relationship between hardware irq
108 numbers and virtual irq numbers. The mapping is exposed via debugfs
109 in the file powerpc/virq_mapping.
110
111 If you don't know what this means you don't need it.
112
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000113config BDI_SWITCH
114 bool "Include BDI-2000 user context switcher"
Paul Mackerrasff642082005-10-10 22:15:52 +1000115 depends on DEBUG_KERNEL && PPC32
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000116 help
117 Include in-kernel support for the Abatron BDI2000 debugger.
118 Unless you are intending to debug the kernel with one of these
119 machines, say N here.
120
121config BOOTX_TEXT
122 bool "Support for early boot text console (BootX or OpenFirmware only)"
Benjamin Herrenschmidt28794d32009-03-10 17:53:27 +0000123 depends on PPC_OF && PPC_BOOK3S
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000124 help
125 Say Y here to see progress messages from the boot firmware in text
126 mode. Requires either BootX or Open Firmware.
127
Michael Ellerman485a2d52006-05-09 16:03:51 +1000128config PPC_EARLY_DEBUG
129 bool "Early debugging (dangerous)"
Hollis Blanchardbbf45ba2008-04-16 23:28:09 -0500130 # PPC_EARLY_DEBUG on 440 leaves AS=1 mappings above the TLB high water
131 # mark, which doesn't work with current 440 KVM.
132 depends on !KVM
Benjamin Herrenschmidt7ee17462007-12-11 14:48:24 +1100133 help
134 Say Y to enable some early debugging facilities that may be available
135 for your processor/board combination. Those facilities are hacks
136 intended to debug problems early during boot, this should not be
137 enabled in a production kernel.
138 Note that enabling this will also cause the kernel default log level
139 to be pushed to max automatically very early during boot
Michael Ellerman485a2d52006-05-09 16:03:51 +1000140
Michael Ellerman296167a2006-01-11 11:54:09 +1100141choice
Michael Ellerman485a2d52006-05-09 16:03:51 +1000142 prompt "Early debugging console"
143 depends on PPC_EARLY_DEBUG
Michael Ellerman296167a2006-01-11 11:54:09 +1100144 help
Michael Ellerman485a2d52006-05-09 16:03:51 +1000145 Use the selected console for early debugging. Careful, if you
146 enable debugging for the wrong type of machine your kernel
147 _will not boot_.
Michael Ellerman296167a2006-01-11 11:54:09 +1100148
149config PPC_EARLY_DEBUG_LPAR
150 bool "LPAR HV Console"
151 depends on PPC_PSERIES
152 help
153 Select this to enable early debugging for a machine with a HVC
154 console on vterm 0.
155
156config PPC_EARLY_DEBUG_G5
157 bool "Apple G5"
158 depends on PPC_PMAC64
159 help
160 Select this to enable early debugging for Apple G5 machines.
161
Michael Ellermancc46bb92006-06-23 18:20:16 +1000162config PPC_EARLY_DEBUG_RTAS_PANEL
Michael Ellerman296167a2006-01-11 11:54:09 +1100163 bool "RTAS Panel"
164 depends on PPC_RTAS
165 help
166 Select this to enable early debugging via the RTAS panel.
167
Michael Ellermancc46bb92006-06-23 18:20:16 +1000168config PPC_EARLY_DEBUG_RTAS_CONSOLE
169 bool "RTAS Console"
170 depends on PPC_RTAS
171 select UDBG_RTAS_CONSOLE
172 help
173 Select this to enable early debugging via the RTAS console.
174
Michael Ellerman296167a2006-01-11 11:54:09 +1100175config PPC_EARLY_DEBUG_MAPLE
176 bool "Maple real mode"
177 depends on PPC_MAPLE
178 help
179 Select this to enable early debugging for Maple.
180
181config PPC_EARLY_DEBUG_ISERIES
182 bool "iSeries HV Console"
183 depends on PPC_ISERIES
184 help
185 Select this to enable early debugging for legacy iSeries. You need
186 to hit "Ctrl-x Ctrl-x" to see the messages on the console.
187
Olof Johansson39c870d2007-02-04 16:36:49 -0600188config PPC_EARLY_DEBUG_PAS_REALMODE
189 bool "PA Semi real mode"
190 depends on PPC_PASEMI
191 help
192 Select this to enable early debugging for PA Semi.
193 Output will be on UART0.
194
Ishizaki Kouc347b792007-02-02 16:47:17 +0900195config PPC_EARLY_DEBUG_BEAT
196 bool "Beat HV Console"
197 depends on PPC_CELLEB
198 select PPC_UDBG_BEAT
199 help
200 Select this to enable early debugging for Celleb with Beat.
201
David Gibsond9b55a02007-05-08 12:59:31 +1000202config PPC_EARLY_DEBUG_44x
203 bool "Early serial debugging for IBM/AMCC 44x CPUs"
204 depends on 44x
David Gibsond9b55a02007-05-08 12:59:31 +1000205 help
206 Select this to enable early debugging for IBM 44x chips via the
Hugh Blemings6bbc5472007-12-21 15:39:28 +1100207 inbuilt serial port. If you enable this, ensure you set
208 PPC_EARLY_DEBUG_44x_PHYSLOW below to suit your target board.
David Gibsond9b55a02007-05-08 12:59:31 +1000209
Benjamin Herrenschmidt9dae8af2007-12-21 15:39:26 +1100210config PPC_EARLY_DEBUG_40x
211 bool "Early serial debugging for IBM/AMCC 40x CPUs"
212 depends on 40x
213 help
214 Select this to enable early debugging for IBM 40x chips via the
215 inbuilt serial port. This works on chips with a 16550 compatible
216 UART. Xilinx chips with uartlite cannot use this option.
217
Scott Woodc374e002007-07-16 11:43:43 -0500218config PPC_EARLY_DEBUG_CPM
219 bool "Early serial debugging for Freescale CPM-based serial ports"
220 depends on SERIAL_CPM
221 select PIN_TLB if PPC_8xx
222 help
223 Select this to enable early debugging for Freescale chips
224 using a CPM-based serial port. This assumes that the bootwrapper
225 has run, and set up the CPM in a particular way.
226
Michael Ellerman296167a2006-01-11 11:54:09 +1100227endchoice
228
David Gibsond9b55a02007-05-08 12:59:31 +1000229config PPC_EARLY_DEBUG_44x_PHYSLOW
230 hex "Low 32 bits of early debug UART physical address"
Adrian Bunk247537b2007-09-26 20:02:52 +0200231 depends on PPC_EARLY_DEBUG_44x
David Gibsond9b55a02007-05-08 12:59:31 +1000232 default "0x40000200"
Hugh Blemings6bbc5472007-12-21 15:39:28 +1100233 help
234 You probably want 0x40000200 for ebony boards and
235 0x40000300 for taishan
David Gibsond9b55a02007-05-08 12:59:31 +1000236
237config PPC_EARLY_DEBUG_44x_PHYSHIGH
238 hex "EPRN of early debug UART physical address"
Adrian Bunk247537b2007-09-26 20:02:52 +0200239 depends on PPC_EARLY_DEBUG_44x
David Gibsond9b55a02007-05-08 12:59:31 +1000240 default "0x1"
241
Benjamin Herrenschmidt9dae8af2007-12-21 15:39:26 +1100242config PPC_EARLY_DEBUG_40x_PHYSADDR
243 hex "Early debug UART physical address"
244 depends on PPC_EARLY_DEBUG_40x
245 default "0xef600300"
246
Scott Woodc374e002007-07-16 11:43:43 -0500247config PPC_EARLY_DEBUG_CPM_ADDR
248 hex "CPM UART early debug transmit descriptor address"
249 depends on PPC_EARLY_DEBUG_CPM
Scott Wood15f8c602007-09-28 14:06:16 -0500250 default "0xfa202008" if PPC_EP88XC
Laurent Pinchartc2dd3522008-04-10 17:01:59 +0200251 default "0xf0001ff8" if CPM2
Scott Wood15f8c602007-09-28 14:06:16 -0500252 default "0xff002008" if CPM1
Scott Woodc374e002007-07-16 11:43:43 -0500253 help
254 This specifies the address of the transmit descriptor
255 used for early debug output. Because it is needed before
256 platform probing is done, all platforms selected must
257 share the same address.
258
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000259endmenu