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authorSven Schnelle <svens@stackframe.org>2021-10-14 22:49:16 +0300
committerHelge Deller <deller@gmx.de>2021-11-01 09:35:59 +0300
commitbc294838cc3443a2fbec58f8936ad4bd0a0b3055 (patch)
tree50082d26870f6afd4a3a13814f4f98e11d08c27b /arch/parisc/Kconfig
parentecac70366dce374014f070b7eacd5865a9ab3b13 (diff)
downloadlinux-bc294838cc3443a2fbec58f8936ad4bd0a0b3055.tar.xz
parisc: add support for TOC (transfer of control)
Almost all PA-RISC machines have either a button that is labeled with 'TOC' or a BMC function to trigger a TOC. TOC is a non-maskable interrupt that is sent to the processor. This can be used for diagnostic purposes like obtaining a stack trace/register dump or to enter KDB/KGDB. As an example, on my c8000, TOC can be used with: CONFIG_KGDB=y CONFIG_KGDB_KDB=y and the 'kgdboc=ttyS0,115200' appended to the command line. Press ^[( on serial console, which will enter the BMC command line, and enter 'TOC s': root@(none):/# ( cli>TOC s Sending TOC/INIT. <Cpu3> 2800035d03e00000 0000000040c21ac8 CC_ERR_CHECK_TOC <Cpu0> 2800035d00e00000 0000000040c21ad0 CC_ERR_CHECK_TOC <Cpu2> 2800035d02e00000 0000000040c21ac8 CC_ERR_CHECK_TOC <Cpu1> 2800035d01e00000 0000000040c21ad0 CC_ERR_CHECK_TOC <Cpu3> 37000f7303e00000 2000000000000000 CC_ERR_CPU_CHECK_SUMMARY <Cpu0> 37000f7300e00000 2000000000000000 CC_ERR_CPU_CHECK_SUMMARY <Cpu2> 37000f7302e00000 2000000000000000 CC_ERR_CPU_CHECK_SUMMARY <Cpu1> 37000f7301e00000 2000000000000000 CC_ERR_CPU_CHECK_SUMMARY <Cpu3> 4300100803e00000 c0000000001d26cc CC_MC_BR_TO_OS_TOC <Cpu0> 4300100800e00000 c0000000001d26cc CC_MC_BR_TO_OS_TOC <Cpu2> 4300100802e00000 c0000000001d26cc CC_MC_BR_TO_OS_TOC <Cpu1> 4300100801e00000 c0000000001d26cc CC_MC_BR_TO_OS_TOC Entering kdb (current=0x00000000411cef80, pid 0) on processor 0 due to NonMaskable Interrupt @ 0x40c21ad0 [0]kdb> Signed-off-by: Sven Schnelle <svens@stackframe.org> Signed-off-by: Helge Deller <deller@gmx.de>
Diffstat (limited to 'arch/parisc/Kconfig')
-rw-r--r--arch/parisc/Kconfig14
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig
index 906187a412ec..3296fcb90019 100644
--- a/arch/parisc/Kconfig
+++ b/arch/parisc/Kconfig
@@ -291,6 +291,20 @@ config SMP
If you don't know what to do here, say N.
+config TOC
+ bool "Support TOC switch"
+ default y if 64BIT || !SMP
+ help
+ Most PA-RISC machines have either a switch at the back of the machine
+ or a command in BMC to trigger a TOC interrupt. If you say Y here a
+ handler will be installed which will either show a backtrace on all
+ CPUs, or enter a possible configured debugger like kgdb/kdb.
+
+ Note that with this option enabled, the kernel will use an additional 16KB
+ per possible CPU as a special stack for the TOC handler.
+
+ If you don't want to debug the Kernel, say N.
+
config PARISC_CPU_TOPOLOGY
bool "Support cpu topology definition"
depends on SMP