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 HCALL_STATS
39	bool "Hypervisor call instrumentation"
40	depends on PPC_PSERIES && DEBUG_FS && TRACEPOINTS
41	help
42	  Adds code to keep track of the number of hypervisor calls made and
43	  the amount of time spent in hypervisor calls.  Wall time spent in
44	  each call is always calculated, and if available CPU cycles spent
45	  are also calculated.  A directory named hcall_inst is added at the
46	  root of the debugfs filesystem.  Within the hcall_inst directory
47	  are files that contain CPU specific call statistics.
48
49	  This option will add a small amount of overhead to all hypervisor
50	  calls.
51
52config PPC_EMULATED_STATS
53	bool "Emulated instructions tracking"
54	depends on DEBUG_FS
55	help
56	  Adds code to keep track of the number of instructions that are
57	  emulated by the in-kernel emulator. Counters for the various classes
58	  of emulated instructions are available under
59	  powerpc/emulated_instructions/ in the root of the debugfs file
60	  system. Optionally (controlled by
61	  powerpc/emulated_instructions/do_warn in debugfs), rate-limited
62	  warnings can be printed to the console when instructions are
63	  emulated.
64
65config CODE_PATCHING_SELFTEST
66	bool "Run self-tests of the code-patching code."
67	depends on DEBUG_KERNEL
68	default n
69
70config FTR_FIXUP_SELFTEST
71	bool "Run self-tests of the feature-fixup code."
72	depends on DEBUG_KERNEL
73	default n
74
75config MSI_BITMAP_SELFTEST
76	bool "Run self-tests of the MSI bitmap code."
77	depends on DEBUG_KERNEL
78	default n
79
80config XMON
81	bool "Include xmon kernel debugger"
82	depends on DEBUG_KERNEL
83	help
84	  Include in-kernel hooks for the xmon kernel monitor/debugger.
85	  Unless you are intending to debug the kernel, say N here.
86	  Make sure to enable also CONFIG_BOOTX_TEXT on Macs. Otherwise
87	  nothing will appear on the screen (xmon writes directly to the
88	  framebuffer memory).
89	  The cmdline option 'xmon' or 'xmon=early' will drop into xmon
90	  very early during boot. 'xmon=on' will just enable the xmon
91	  debugger hooks.  'xmon=off' will disable the debugger hooks
92	  if CONFIG_XMON_DEFAULT is set.
93	  xmon will print a backtrace on the very first invocation.
94	  'xmon=nobt' will disable this autobacktrace.
95
96config XMON_DEFAULT
97	bool "Enable xmon by default"
98	depends on XMON
99	help
100	  xmon is normally disabled unless booted with 'xmon=on'.
101	  Use 'xmon=off' to disable xmon init during runtime.
102
103config XMON_DISASSEMBLY
104	bool "Include disassembly support in xmon"
105	depends on XMON
106	default y
107	help
108	  Include support for disassembling in xmon. You probably want
109	  to say Y here, unless you're building for a memory-constrained
110	  system.
111
112config DEBUGGER
113	bool
114	depends on KGDB || XMON
115	default y
116
117config BDI_SWITCH
118	bool "Include BDI-2000 user context switcher"
119	depends on DEBUG_KERNEL && PPC32
120	help
121	  Include in-kernel support for the Abatron BDI2000 debugger.
122	  Unless you are intending to debug the kernel with one of these
123	  machines, say N here.
124
125config BOOTX_TEXT
126	bool "Support for early boot text console (BootX or OpenFirmware only)"
127	depends on PPC_OF && PPC_BOOK3S
128	help
129	  Say Y here to see progress messages from the boot firmware in text
130	  mode. Requires either BootX or Open Firmware.
131
132config PPC_EARLY_DEBUG
133	bool "Early debugging (dangerous)"
134	help
135	  Say Y to enable some early debugging facilities that may be available
136	  for your processor/board combination. Those facilities are hacks
137	  intended to debug problems early during boot, this should not be
138	  enabled in a production kernel.
139	  Note that enabling this will also cause the kernel default log level
140	  to be pushed to max automatically very early during boot
141
142choice
143	prompt "Early debugging console"
144	depends on PPC_EARLY_DEBUG
145	help
146	  Use the selected console for early debugging. Careful, if you
147	  enable debugging for the wrong type of machine your kernel
148	  _will not boot_.
149
150config PPC_EARLY_DEBUG_LPAR
151	bool "LPAR HV Console"
152	depends on PPC_PSERIES
153	help
154	  Select this to enable early debugging for a machine with a HVC
155	  console on vterm 0.
156
157config PPC_EARLY_DEBUG_LPAR_HVSI
158	bool "LPAR HVSI Console"
159	depends on PPC_PSERIES
160	help
161	  Select this to enable early debugging for a machine with a HVSI
162	  console on a specified vterm.
163
164config PPC_EARLY_DEBUG_G5
165	bool "Apple G5"
166	depends on PPC_PMAC64
167	help
168	  Select this to enable early debugging for Apple G5 machines.
169
170config PPC_EARLY_DEBUG_RTAS_PANEL
171	bool "RTAS Panel"
172	depends on PPC_RTAS
173	help
174	  Select this to enable early debugging via the RTAS panel.
175
176config PPC_EARLY_DEBUG_RTAS_CONSOLE
177	bool "RTAS Console"
178	depends on PPC_RTAS
179	select UDBG_RTAS_CONSOLE
180	help
181	  Select this to enable early debugging via the RTAS console.
182
183config PPC_EARLY_DEBUG_MAPLE
184	bool "Maple real mode"
185	depends on PPC_MAPLE
186	help
187	  Select this to enable early debugging for Maple.
188
189config PPC_EARLY_DEBUG_PAS_REALMODE
190	bool "PA Semi real mode"
191	depends on PPC_PASEMI
192	help
193	  Select this to enable early debugging for PA Semi.
194	  Output will be on UART0.
195
196config PPC_EARLY_DEBUG_BEAT
197	bool "Beat HV Console"
198	depends on PPC_CELLEB
199	select PPC_UDBG_BEAT
200	help
201	  Select this to enable early debugging for Celleb with Beat.
202
203config PPC_EARLY_DEBUG_44x
204	bool "Early serial debugging for IBM/AMCC 44x CPUs"
205	# PPC_EARLY_DEBUG on 440 leaves AS=1 mappings above the TLB high water
206	# mark, which doesn't work with current 440 KVM.
207	depends on 44x && !KVM
208	help
209	  Select this to enable early debugging for IBM 44x chips via the
210	  inbuilt serial port.  If you enable this, ensure you set
211          PPC_EARLY_DEBUG_44x_PHYSLOW below to suit your target board.
212
213config PPC_EARLY_DEBUG_40x
214	bool "Early serial debugging for IBM/AMCC 40x CPUs"
215	depends on 40x
216	help
217	  Select this to enable early debugging for IBM 40x chips via the
218	  inbuilt serial port. This works on chips with a 16550 compatible
219	  UART. Xilinx chips with uartlite cannot use this option.
220
221config PPC_EARLY_DEBUG_CPM
222	bool "Early serial debugging for Freescale CPM-based serial ports"
223	depends on SERIAL_CPM
224	select PIN_TLB if PPC_8xx
225	help
226	  Select this to enable early debugging for Freescale chips
227	  using a CPM-based serial port.  This assumes that the bootwrapper
228	  has run, and set up the CPM in a particular way.
229
230config PPC_EARLY_DEBUG_USBGECKO
231	bool "Early debugging through the USB Gecko adapter"
232	depends on GAMECUBE_COMMON
233	select USBGECKO_UDBG
234	help
235	  Select this to enable early debugging for Nintendo GameCube/Wii
236	  consoles via an external USB Gecko adapter.
237
238config PPC_EARLY_DEBUG_WSP
239	bool "Early debugging via WSP's internal UART"
240	depends on PPC_WSP
241	select PPC_UDBG_16550
242
243config PPC_EARLY_DEBUG_PS3GELIC
244	bool "Early debugging through the PS3 Ethernet port"
245	depends on PPC_PS3
246	select PS3GELIC_UDBG
247	help
248	  Select this to enable early debugging for the PlayStation3 via
249	  UDP broadcasts sent out through the Ethernet port.
250
251config PPC_EARLY_DEBUG_OPAL_RAW
252	bool "OPAL raw console"
253	depends on HVC_OPAL
254	help
255	  Select this to enable early debugging for the PowerNV platform
256	  using a "raw" console
257
258config PPC_EARLY_DEBUG_OPAL_HVSI
259	bool "OPAL hvsi console"
260	depends on HVC_OPAL
261	help
262	  Select this to enable early debugging for the PowerNV platform
263	  using an "hvsi" console
264
265endchoice
266
267config PPC_EARLY_DEBUG_OPAL
268	def_bool y
269	depends on PPC_EARLY_DEBUG_OPAL_RAW || PPC_EARLY_DEBUG_OPAL_HVSI
270
271
272config PPC_EARLY_DEBUG_HVSI_VTERMNO
273	hex "vterm number to use with early debug HVSI"
274	depends on PPC_EARLY_DEBUG_LPAR_HVSI
275	default "0x30000000"
276	help
277	  You probably want 0x30000000 for your first serial port and
278	  0x30000001 for your second one
279
280config PPC_EARLY_DEBUG_OPAL_VTERMNO
281	hex "vterm number to use with OPAL early debug"
282	depends on PPC_EARLY_DEBUG_OPAL
283	default "0"
284	help
285	  This correspond to which /dev/hvcN you want to use for early
286	  debug.
287
288	  On OPAL v1 (takeover) this should always be 0
289	  On OPAL v2, this will be 0 for network console and 1 or 2 for
290	  the machine built-in serial ports.
291
292config PPC_EARLY_DEBUG_44x_PHYSLOW
293	hex "Low 32 bits of early debug UART physical address"
294	depends on PPC_EARLY_DEBUG_44x
295	default "0x40000200"
296	help
297	  You probably want 0x40000200 for ebony boards and
298          0x40000300 for taishan
299
300config PPC_EARLY_DEBUG_44x_PHYSHIGH
301	hex "EPRN of early debug UART physical address"
302	depends on PPC_EARLY_DEBUG_44x
303	default "0x1"
304
305config PPC_EARLY_DEBUG_40x_PHYSADDR
306	hex "Early debug UART physical address"
307	depends on PPC_EARLY_DEBUG_40x
308	default "0xef600300"
309
310config PPC_EARLY_DEBUG_CPM_ADDR
311	hex "CPM UART early debug transmit descriptor address"
312	depends on PPC_EARLY_DEBUG_CPM
313	default "0xfa202008" if PPC_EP88XC
314	default "0xf0001ff8" if CPM2
315	default "0xff002008" if CPM1
316	help
317	  This specifies the address of the transmit descriptor
318	  used for early debug output.  Because it is needed before
319	  platform probing is done, all platforms selected must
320	  share the same address.
321
322config STRICT_DEVMEM
323	def_bool y
324	prompt "Filter access to /dev/mem"
325	help
326	  This option restricts access to /dev/mem.  If this option is
327	  disabled, you allow userspace access to all memory, including
328	  kernel and userspace memory. Accidental memory access is likely
329	  to be disastrous.
330	  Memory access is required for experts who want to debug the kernel.
331
332	  If you are unsure, say Y.
333
334endmenu
335