1menu "Kernel hacking"
2
3source "lib/Kconfig.debug"
4
5config PPC_DISABLE_WERROR
6	bool "Don't build arch/powerpc code with -Werror"
7	default n
8	help
9	  This option tells the compiler NOT to build the code under
10	  arch/powerpc with the -Werror flag (which means warnings
11	  are treated as errors).
12
13	  Only enable this if you are hitting a build failure in the
14	  arch/powerpc code caused by a warning, and you don't feel
15	  inclined to fix it.
16
17config PPC_WERROR
18	bool
19	depends on !PPC_DISABLE_WERROR
20	default y
21
22config PRINT_STACK_DEPTH
23	int "Stack depth to print" if DEBUG_KERNEL
24	default 64
25	help
26	  This option allows you to set the stack depth that the kernel
27	  prints in stack traces. This can be useful if your display is
28	  too small and stack traces cause important information to
29	  scroll off the screen.
30
31config DEBUG_STACKOVERFLOW
32	bool "Check for stack overflows"
33	depends on DEBUG_KERNEL
34	help
35	  This option will cause messages to be printed if free stack space
36	  drops below a certain limit.
37
38config DEBUG_STACK_USAGE
39	bool "Stack utilization instrumentation"
40	depends on DEBUG_KERNEL
41	help
42	  Enables the display of the minimum amount of free stack which each
43	  task has ever had available in the sysrq-T and sysrq-P debug output.
44
45	  This option will slow down process creation somewhat.
46
47config DEBUG_PER_CPU_MAPS
48	bool "Debug access to per_cpu maps"
49	depends on DEBUG_KERNEL
50	depends on SMP
51	default n
52	---help---
53	  Say Y to verify that the per_cpu map being accessed has
54	  been setup.  Adds a fair amount of code to kernel memory
55	  and decreases performance.
56
57	  Say N if unsure.
58
59config HCALL_STATS
60	bool "Hypervisor call instrumentation"
61	depends on PPC_PSERIES && DEBUG_FS && TRACEPOINTS
62	help
63	  Adds code to keep track of the number of hypervisor calls made and
64	  the amount of time spent in hypervisor calls.  Wall time spent in
65	  each call is always calculated, and if available CPU cycles spent
66	  are also calculated.  A directory named hcall_inst is added at the
67	  root of the debugfs filesystem.  Within the hcall_inst directory
68	  are files that contain CPU specific call statistics.
69
70	  This option will add a small amount of overhead to all hypervisor
71	  calls.
72
73config PPC_EMULATED_STATS
74	bool "Emulated instructions tracking"
75	depends on DEBUG_FS
76	help
77	  Adds code to keep track of the number of instructions that are
78	  emulated by the in-kernel emulator. Counters for the various classes
79	  of emulated instructions are available under
80	  powerpc/emulated_instructions/ in the root of the debugfs file
81	  system. Optionally (controlled by
82	  powerpc/emulated_instructions/do_warn in debugfs), rate-limited
83	  warnings can be printed to the console when instructions are
84	  emulated.
85
86config CODE_PATCHING_SELFTEST
87	bool "Run self-tests of the code-patching code."
88	depends on DEBUG_KERNEL
89	default n
90
91config FTR_FIXUP_SELFTEST
92	bool "Run self-tests of the feature-fixup code."
93	depends on DEBUG_KERNEL
94	default n
95
96config MSI_BITMAP_SELFTEST
97	bool "Run self-tests of the MSI bitmap code."
98	depends on DEBUG_KERNEL
99	default n
100
101config XMON
102	bool "Include xmon kernel debugger"
103	depends on DEBUG_KERNEL
104	help
105	  Include in-kernel hooks for the xmon kernel monitor/debugger.
106	  Unless you are intending to debug the kernel, say N here.
107	  Make sure to enable also CONFIG_BOOTX_TEXT on Macs. Otherwise
108	  nothing will appear on the screen (xmon writes directly to the
109	  framebuffer memory).
110	  The cmdline option 'xmon' or 'xmon=early' will drop into xmon
111	  very early during boot. 'xmon=on' will just enable the xmon
112	  debugger hooks.  'xmon=off' will disable the debugger hooks
113	  if CONFIG_XMON_DEFAULT is set.
114	  xmon will print a backtrace on the very first invocation.
115	  'xmon=nobt' will disable this autobacktrace.
116
117config XMON_DEFAULT
118	bool "Enable xmon by default"
119	depends on XMON
120	help
121	  xmon is normally disabled unless booted with 'xmon=on'.
122	  Use 'xmon=off' to disable xmon init during runtime.
123
124config XMON_DISASSEMBLY
125	bool "Include disassembly support in xmon"
126	depends on XMON
127	default y
128	help
129	  Include support for disassembling in xmon. You probably want
130	  to say Y here, unless you're building for a memory-constrained
131	  system.
132
133config DEBUGGER
134	bool
135	depends on KGDB || XMON
136	default y
137
138config VIRQ_DEBUG
139	bool "Expose hardware/virtual IRQ mapping via debugfs"
140	depends on DEBUG_FS
141	help
142	  This option will show the mapping relationship between hardware irq
143	  numbers and virtual irq numbers. The mapping is exposed via debugfs
144	  in the file powerpc/virq_mapping.
145
146	  If you don't know what this means you don't need it.
147
148config BDI_SWITCH
149	bool "Include BDI-2000 user context switcher"
150	depends on DEBUG_KERNEL && PPC32
151	help
152	  Include in-kernel support for the Abatron BDI2000 debugger.
153	  Unless you are intending to debug the kernel with one of these
154	  machines, say N here.
155
156config BOOTX_TEXT
157	bool "Support for early boot text console (BootX or OpenFirmware only)"
158	depends on PPC_OF && PPC_BOOK3S
159	help
160	  Say Y here to see progress messages from the boot firmware in text
161	  mode. Requires either BootX or Open Firmware.
162
163config PPC_EARLY_DEBUG
164	bool "Early debugging (dangerous)"
165	# PPC_EARLY_DEBUG on 440 leaves AS=1 mappings above the TLB high water
166	# mark, which doesn't work with current 440 KVM.
167	depends on !KVM
168	help
169	  Say Y to enable some early debugging facilities that may be available
170	  for your processor/board combination. Those facilities are hacks
171	  intended to debug problems early during boot, this should not be
172	  enabled in a production kernel.
173	  Note that enabling this will also cause the kernel default log level
174	  to be pushed to max automatically very early during boot
175
176choice
177	prompt "Early debugging console"
178	depends on PPC_EARLY_DEBUG
179	help
180	  Use the selected console for early debugging. Careful, if you
181	  enable debugging for the wrong type of machine your kernel
182	  _will not boot_.
183
184config PPC_EARLY_DEBUG_LPAR
185	bool "LPAR HV Console"
186	depends on PPC_PSERIES
187	help
188	  Select this to enable early debugging for a machine with a HVC
189	  console on vterm 0.
190
191config PPC_EARLY_DEBUG_G5
192	bool "Apple G5"
193	depends on PPC_PMAC64
194	help
195	  Select this to enable early debugging for Apple G5 machines.
196
197config PPC_EARLY_DEBUG_RTAS_PANEL
198	bool "RTAS Panel"
199	depends on PPC_RTAS
200	help
201	  Select this to enable early debugging via the RTAS panel.
202
203config PPC_EARLY_DEBUG_RTAS_CONSOLE
204	bool "RTAS Console"
205	depends on PPC_RTAS
206	select UDBG_RTAS_CONSOLE
207	help
208	  Select this to enable early debugging via the RTAS console.
209
210config PPC_EARLY_DEBUG_MAPLE
211	bool "Maple real mode"
212	depends on PPC_MAPLE
213	help
214	  Select this to enable early debugging for Maple.
215
216config PPC_EARLY_DEBUG_ISERIES
217	bool "iSeries HV Console"
218	depends on PPC_ISERIES
219	help
220	  Select this to enable early debugging for legacy iSeries. You need
221	  to hit "Ctrl-x Ctrl-x" to see the messages on the console.
222
223config PPC_EARLY_DEBUG_PAS_REALMODE
224	bool "PA Semi real mode"
225	depends on PPC_PASEMI
226	help
227	  Select this to enable early debugging for PA Semi.
228	  Output will be on UART0.
229
230config PPC_EARLY_DEBUG_BEAT
231	bool "Beat HV Console"
232	depends on PPC_CELLEB
233	select PPC_UDBG_BEAT
234	help
235	  Select this to enable early debugging for Celleb with Beat.
236
237config PPC_EARLY_DEBUG_44x
238	bool "Early serial debugging for IBM/AMCC 44x CPUs"
239	depends on 44x
240	help
241	  Select this to enable early debugging for IBM 44x chips via the
242	  inbuilt serial port.  If you enable this, ensure you set
243          PPC_EARLY_DEBUG_44x_PHYSLOW below to suit your target board.
244
245config PPC_EARLY_DEBUG_40x
246	bool "Early serial debugging for IBM/AMCC 40x CPUs"
247	depends on 40x
248	help
249	  Select this to enable early debugging for IBM 40x chips via the
250	  inbuilt serial port. This works on chips with a 16550 compatible
251	  UART. Xilinx chips with uartlite cannot use this option.
252
253config PPC_EARLY_DEBUG_CPM
254	bool "Early serial debugging for Freescale CPM-based serial ports"
255	depends on SERIAL_CPM
256	select PIN_TLB if PPC_8xx
257	help
258	  Select this to enable early debugging for Freescale chips
259	  using a CPM-based serial port.  This assumes that the bootwrapper
260	  has run, and set up the CPM in a particular way.
261
262config PPC_EARLY_DEBUG_USBGECKO
263	bool "Early debugging through the USB Gecko adapter"
264	depends on GAMECUBE_COMMON
265	select USBGECKO_UDBG
266	help
267	  Select this to enable early debugging for Nintendo GameCube/Wii
268	  consoles via an external USB Gecko adapter.
269
270endchoice
271
272config PPC_EARLY_DEBUG_44x_PHYSLOW
273	hex "Low 32 bits of early debug UART physical address"
274	depends on PPC_EARLY_DEBUG_44x
275	default "0x40000200"
276	help
277	  You probably want 0x40000200 for ebony boards and
278          0x40000300 for taishan
279
280config PPC_EARLY_DEBUG_44x_PHYSHIGH
281	hex "EPRN of early debug UART physical address"
282	depends on PPC_EARLY_DEBUG_44x
283	default "0x1"
284
285config PPC_EARLY_DEBUG_40x_PHYSADDR
286	hex "Early debug UART physical address"
287	depends on PPC_EARLY_DEBUG_40x
288	default "0xef600300"
289
290config PPC_EARLY_DEBUG_CPM_ADDR
291	hex "CPM UART early debug transmit descriptor address"
292	depends on PPC_EARLY_DEBUG_CPM
293	default "0xfa202008" if PPC_EP88XC
294	default "0xf0001ff8" if CPM2
295	default "0xff002008" if CPM1
296	help
297	  This specifies the address of the transmit descriptor
298	  used for early debug output.  Because it is needed before
299	  platform probing is done, all platforms selected must
300	  share the same address.
301
302endmenu
303