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