1menu "Kernel hacking"
2
3source "lib/Kconfig.debug"
4
5config DEBUG_STACKOVERFLOW
6	bool "Check for stack overflows"
7	depends on DEBUG_KERNEL
8	help
9	  This option will cause messages to be printed if free stack space
10	  drops below a certain limit.
11
12config DEBUG_STACK_USAGE
13	bool "Stack utilization instrumentation"
14	depends on DEBUG_KERNEL
15	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
21config DEBUG_PAGEALLOC
22        bool "Debug page memory allocations"
23        depends on DEBUG_KERNEL && !SOFTWARE_SUSPEND
24        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
30config 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
35	  the amount of time spent in hypervisor calls.  Wall time spent in
36	  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
44config 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
51config KGDB
52	bool "Include kgdb kernel debugger"
53	depends on DEBUGGER && (BROKEN || PPC_GEN550 || 4xx)
54	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"
89	depends on DEBUGGER
90	help
91	  Include in-kernel hooks for the xmon kernel monitor/debugger.
92	  Unless you are intending to debug the kernel, say N here.
93	  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.
100	  xmon will print a backtrace on the very first invocation.
101	  'xmon=nobt' will disable this autobacktrace.
102
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
110config 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
119config 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.
126
127config BDI_SWITCH
128	bool "Include BDI-2000 user context switcher"
129	depends on DEBUG_KERNEL && PPC32
130	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)"
137	depends PPC_OF
138	help
139	  Say Y here to see progress messages from the boot firmware in text
140	  mode. Requires either BootX or Open Firmware.
141
142config PPC_EARLY_DEBUG
143	bool "Early debugging (dangerous)"
144
145choice
146	prompt "Early debugging console"
147	depends on PPC_EARLY_DEBUG
148	help
149	  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_.
152
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
166config PPC_EARLY_DEBUG_RTAS_PANEL
167	bool "RTAS Panel"
168	depends on PPC_RTAS
169	help
170	  Select this to enable early debugging via the RTAS panel.
171
172config 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
179config 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
192config 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
199config 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
206config 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
214endchoice
215
216config 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
226endmenu
227