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 && !HIBERNATION 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 CODE_PATCHING_SELFTEST 45 bool "Run self-tests of the code-patching code." 46 depends on DEBUG_KERNEL 47 default n 48 49config FTR_FIXUP_SELFTEST 50 bool "Run self-tests of the feature-fixup code." 51 depends on DEBUG_KERNEL 52 default n 53 54config XMON 55 bool "Include xmon kernel debugger" 56 depends on DEBUG_KERNEL 57 help 58 Include in-kernel hooks for the xmon kernel monitor/debugger. 59 Unless you are intending to debug the kernel, say N here. 60 Make sure to enable also CONFIG_BOOTX_TEXT on Macs. Otherwise 61 nothing will appear on the screen (xmon writes directly to the 62 framebuffer memory). 63 The cmdline option 'xmon' or 'xmon=early' will drop into xmon 64 very early during boot. 'xmon=on' will just enable the xmon 65 debugger hooks. 'xmon=off' will disable the debugger hooks 66 if CONFIG_XMON_DEFAULT is set. 67 xmon will print a backtrace on the very first invocation. 68 'xmon=nobt' will disable this autobacktrace. 69 70config XMON_DEFAULT 71 bool "Enable xmon by default" 72 depends on XMON 73 help 74 xmon is normally disabled unless booted with 'xmon=on'. 75 Use 'xmon=off' to disable xmon init during runtime. 76 77config XMON_DISASSEMBLY 78 bool "Include disassembly support in xmon" 79 depends on XMON 80 default y 81 help 82 Include support for disassembling in xmon. You probably want 83 to say Y here, unless you're building for a memory-constrained 84 system. 85 86config DEBUGGER 87 bool 88 depends on KGDB || XMON 89 default y 90 91config IRQSTACKS 92 bool "Use separate kernel stacks when processing interrupts" 93 help 94 If you say Y here the kernel will use separate kernel stacks 95 for handling hard and soft interrupts. This can help avoid 96 overflowing the process kernel stacks. 97 98config VIRQ_DEBUG 99 bool "Expose hardware/virtual IRQ mapping via debugfs" 100 depends on DEBUG_FS && PPC_MERGE 101 help 102 This option will show the mapping relationship between hardware irq 103 numbers and virtual irq numbers. The mapping is exposed via debugfs 104 in the file powerpc/virq_mapping. 105 106 If you don't know what this means you don't need it. 107 108config BDI_SWITCH 109 bool "Include BDI-2000 user context switcher" 110 depends on DEBUG_KERNEL && PPC32 111 help 112 Include in-kernel support for the Abatron BDI2000 debugger. 113 Unless you are intending to debug the kernel with one of these 114 machines, say N here. 115 116config BOOTX_TEXT 117 bool "Support for early boot text console (BootX or OpenFirmware only)" 118 depends on PPC_OF && PPC_MULTIPLATFORM 119 help 120 Say Y here to see progress messages from the boot firmware in text 121 mode. Requires either BootX or Open Firmware. 122 123config PPC_EARLY_DEBUG 124 bool "Early debugging (dangerous)" 125 # PPC_EARLY_DEBUG on 440 leaves AS=1 mappings above the TLB high water 126 # mark, which doesn't work with current 440 KVM. 127 depends on !KVM 128 help 129 Say Y to enable some early debugging facilities that may be available 130 for your processor/board combination. Those facilities are hacks 131 intended to debug problems early during boot, this should not be 132 enabled in a production kernel. 133 Note that enabling this will also cause the kernel default log level 134 to be pushed to max automatically very early during boot 135 136choice 137 prompt "Early debugging console" 138 depends on PPC_EARLY_DEBUG 139 help 140 Use the selected console for early debugging. Careful, if you 141 enable debugging for the wrong type of machine your kernel 142 _will not boot_. 143 144config PPC_EARLY_DEBUG_LPAR 145 bool "LPAR HV Console" 146 depends on PPC_PSERIES 147 help 148 Select this to enable early debugging for a machine with a HVC 149 console on vterm 0. 150 151config PPC_EARLY_DEBUG_G5 152 bool "Apple G5" 153 depends on PPC_PMAC64 154 help 155 Select this to enable early debugging for Apple G5 machines. 156 157config PPC_EARLY_DEBUG_RTAS_PANEL 158 bool "RTAS Panel" 159 depends on PPC_RTAS 160 help 161 Select this to enable early debugging via the RTAS panel. 162 163config PPC_EARLY_DEBUG_RTAS_CONSOLE 164 bool "RTAS Console" 165 depends on PPC_RTAS 166 select UDBG_RTAS_CONSOLE 167 help 168 Select this to enable early debugging via the RTAS console. 169 170config PPC_EARLY_DEBUG_MAPLE 171 bool "Maple real mode" 172 depends on PPC_MAPLE 173 help 174 Select this to enable early debugging for Maple. 175 176config PPC_EARLY_DEBUG_ISERIES 177 bool "iSeries HV Console" 178 depends on PPC_ISERIES 179 help 180 Select this to enable early debugging for legacy iSeries. You need 181 to hit "Ctrl-x Ctrl-x" to see the messages on the console. 182 183config PPC_EARLY_DEBUG_PAS_REALMODE 184 bool "PA Semi real mode" 185 depends on PPC_PASEMI 186 help 187 Select this to enable early debugging for PA Semi. 188 Output will be on UART0. 189 190config PPC_EARLY_DEBUG_BEAT 191 bool "Beat HV Console" 192 depends on PPC_CELLEB 193 select PPC_UDBG_BEAT 194 help 195 Select this to enable early debugging for Celleb with Beat. 196 197config PPC_EARLY_DEBUG_44x 198 bool "Early serial debugging for IBM/AMCC 44x CPUs" 199 depends on 44x 200 help 201 Select this to enable early debugging for IBM 44x chips via the 202 inbuilt serial port. If you enable this, ensure you set 203 PPC_EARLY_DEBUG_44x_PHYSLOW below to suit your target board. 204 205config PPC_EARLY_DEBUG_40x 206 bool "Early serial debugging for IBM/AMCC 40x CPUs" 207 depends on 40x 208 help 209 Select this to enable early debugging for IBM 40x chips via the 210 inbuilt serial port. This works on chips with a 16550 compatible 211 UART. Xilinx chips with uartlite cannot use this option. 212 213config PPC_EARLY_DEBUG_CPM 214 bool "Early serial debugging for Freescale CPM-based serial ports" 215 depends on SERIAL_CPM 216 select PIN_TLB if PPC_8xx 217 help 218 Select this to enable early debugging for Freescale chips 219 using a CPM-based serial port. This assumes that the bootwrapper 220 has run, and set up the CPM in a particular way. 221 222endchoice 223 224config PPC_EARLY_DEBUG_44x_PHYSLOW 225 hex "Low 32 bits of early debug UART physical address" 226 depends on PPC_EARLY_DEBUG_44x 227 default "0x40000200" 228 help 229 You probably want 0x40000200 for ebony boards and 230 0x40000300 for taishan 231 232config PPC_EARLY_DEBUG_44x_PHYSHIGH 233 hex "EPRN of early debug UART physical address" 234 depends on PPC_EARLY_DEBUG_44x 235 default "0x1" 236 237config PPC_EARLY_DEBUG_40x_PHYSADDR 238 hex "Early debug UART physical address" 239 depends on PPC_EARLY_DEBUG_40x 240 default "0xef600300" 241 242config PPC_EARLY_DEBUG_CPM_ADDR 243 hex "CPM UART early debug transmit descriptor address" 244 depends on PPC_EARLY_DEBUG_CPM 245 default "0xfa202008" if PPC_EP88XC 246 default "0xf0001ff8" if CPM2 247 default "0xff002008" if CPM1 248 help 249 This specifies the address of the transmit descriptor 250 used for early debug output. Because it is needed before 251 platform probing is done, all platforms selected must 252 share the same address. 253 254endmenu 255