blob: 22acece95b118d5c6055fed0f72ff7c5a1cbe18b [file] [log] [blame]
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
60choice
61 prompt "Serial Port"
62 depends on KGDB
63 default KGDB_TTYS1
64
65config KGDB_TTYS0
66 bool "ttyS0"
67
68config KGDB_TTYS1
69 bool "ttyS1"
70
71config KGDB_TTYS2
72 bool "ttyS2"
73
74config KGDB_TTYS3
75 bool "ttyS3"
76
77endchoice
78
79config KGDB_CONSOLE
80 bool "Enable serial console thru kgdb port"
81 depends on KGDB && 8xx || CPM2
82 help
83 If you enable this, all serial console messages will be sent
84 over the gdb stub.
85 If unsure, say N.
86
87config XMON
88 bool "Include xmon kernel debugger"
Stephen Rothwellbbb68172006-11-30 11:44:09 +110089 depends on DEBUGGER
Paul Mackerras14cf11a2005-09-26 16:04:21 +100090 help
91 Include in-kernel hooks for the xmon kernel monitor/debugger.
92 Unless you are intending to debug the kernel, say N here.
Paul Mackerrasff642082005-10-10 22:15:52 +100093 Make sure to enable also CONFIG_BOOTX_TEXT on Macs. Otherwise
94 nothing will appear on the screen (xmon writes directly to the
95 framebuffer memory).
96 The cmdline option 'xmon' or 'xmon=early' will drop into xmon
97 very early during boot. 'xmon=on' will just enable the xmon
98 debugger hooks. 'xmon=off' will disable the debugger hooks
99 if CONFIG_XMON_DEFAULT is set.
Olaf Hering26c8af52006-09-08 16:29:21 +0200100 xmon will print a backtrace on the very first invocation.
101 'xmon=nobt' will disable this autobacktrace.
Paul Mackerrasff642082005-10-10 22:15:52 +1000102
103config XMON_DEFAULT
104 bool "Enable xmon by default"
105 depends on XMON
106 help
107 xmon is normally disabled unless booted with 'xmon=on'.
108 Use 'xmon=off' to disable xmon init during runtime.
109
Michael Ellermane0426042006-11-23 00:46:45 +0100110config XMON_DISASSEMBLY
111 bool "Include disassembly support in xmon"
112 depends on XMON
113 default y
114 help
115 Include support for disassembling in xmon. You probably want
116 to say Y here, unless you're building for a memory-constrained
117 system.
118
Paul Mackerrasff642082005-10-10 22:15:52 +1000119config IRQSTACKS
120 bool "Use separate kernel stacks when processing interrupts"
121 depends on PPC64
122 help
123 If you say Y here the kernel will use separate kernel stacks
124 for handling hard and soft interrupts. This can help avoid
125 overflowing the process kernel stacks.
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000126
127config BDI_SWITCH
128 bool "Include BDI-2000 user context switcher"
Paul Mackerrasff642082005-10-10 22:15:52 +1000129 depends on DEBUG_KERNEL && PPC32
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000130 help
131 Include in-kernel support for the Abatron BDI2000 debugger.
132 Unless you are intending to debug the kernel with one of these
133 machines, say N here.
134
135config BOOTX_TEXT
136 bool "Support for early boot text console (BootX or OpenFirmware only)"
Kumar Galad1c81312007-07-26 00:43:36 -0500137 depends PPC_OF && PPC_MULTIPLATFORM
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000138 help
139 Say Y here to see progress messages from the boot firmware in text
140 mode. Requires either BootX or Open Firmware.
141
Michael Ellerman485a2d52006-05-09 16:03:51 +1000142config PPC_EARLY_DEBUG
143 bool "Early debugging (dangerous)"
144
Michael Ellerman296167a2006-01-11 11:54:09 +1100145choice
Michael Ellerman485a2d52006-05-09 16:03:51 +1000146 prompt "Early debugging console"
147 depends on PPC_EARLY_DEBUG
Michael Ellerman296167a2006-01-11 11:54:09 +1100148 help
Michael Ellerman485a2d52006-05-09 16:03:51 +1000149 Use the selected console for early debugging. Careful, if you
150 enable debugging for the wrong type of machine your kernel
151 _will not boot_.
Michael Ellerman296167a2006-01-11 11:54:09 +1100152
153config PPC_EARLY_DEBUG_LPAR
154 bool "LPAR HV Console"
155 depends on PPC_PSERIES
156 help
157 Select this to enable early debugging for a machine with a HVC
158 console on vterm 0.
159
160config PPC_EARLY_DEBUG_G5
161 bool "Apple G5"
162 depends on PPC_PMAC64
163 help
164 Select this to enable early debugging for Apple G5 machines.
165
Michael Ellermancc46bb92006-06-23 18:20:16 +1000166config PPC_EARLY_DEBUG_RTAS_PANEL
Michael Ellerman296167a2006-01-11 11:54:09 +1100167 bool "RTAS Panel"
168 depends on PPC_RTAS
169 help
170 Select this to enable early debugging via the RTAS panel.
171
Michael Ellermancc46bb92006-06-23 18:20:16 +1000172config PPC_EARLY_DEBUG_RTAS_CONSOLE
173 bool "RTAS Console"
174 depends on PPC_RTAS
175 select UDBG_RTAS_CONSOLE
176 help
177 Select this to enable early debugging via the RTAS console.
178
Michael Ellerman296167a2006-01-11 11:54:09 +1100179config PPC_EARLY_DEBUG_MAPLE
180 bool "Maple real mode"
181 depends on PPC_MAPLE
182 help
183 Select this to enable early debugging for Maple.
184
185config PPC_EARLY_DEBUG_ISERIES
186 bool "iSeries HV Console"
187 depends on PPC_ISERIES
188 help
189 Select this to enable early debugging for legacy iSeries. You need
190 to hit "Ctrl-x Ctrl-x" to see the messages on the console.
191
Olof Johansson39c870d2007-02-04 16:36:49 -0600192config PPC_EARLY_DEBUG_PAS_REALMODE
193 bool "PA Semi real mode"
194 depends on PPC_PASEMI
195 help
196 Select this to enable early debugging for PA Semi.
197 Output will be on UART0.
198
Ishizaki Kouc347b792007-02-02 16:47:17 +0900199config PPC_EARLY_DEBUG_BEAT
200 bool "Beat HV Console"
201 depends on PPC_CELLEB
202 select PPC_UDBG_BEAT
203 help
204 Select this to enable early debugging for Celleb with Beat.
205
David Gibsond9b55a02007-05-08 12:59:31 +1000206config PPC_EARLY_DEBUG_44x
207 bool "Early serial debugging for IBM/AMCC 44x CPUs"
208 depends on 44x
209 select PPC_UDBG_16550
210 help
211 Select this to enable early debugging for IBM 44x chips via the
212 inbuilt serial port.
213
Michael Ellerman296167a2006-01-11 11:54:09 +1100214endchoice
215
David Gibsond9b55a02007-05-08 12:59:31 +1000216config PPC_EARLY_DEBUG_44x_PHYSLOW
217 hex "Low 32 bits of early debug UART physical address"
218 depends PPC_EARLY_DEBUG_44x
219 default "0x40000200"
220
221config PPC_EARLY_DEBUG_44x_PHYSHIGH
222 hex "EPRN of early debug UART physical address"
223 depends PPC_EARLY_DEBUG_44x
224 default "0x1"
225
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000226endmenu