x86,kgdb: Implement early hardware breakpoint debugging

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It is not possible to use the hw_breakpoint.c API prior to mm_init(),
but it is possible to use hardware breakpoints with the kernel
debugger.

Prior to smp_init() it is possible to simply write to the dr registers
of the boot cpu directly.  This can be used up until the
kgdb_arch_late() is invoked, at which point the standard hw_breakpoint.c
API will get used.

CC: Frederic Weisbecker <fweisbec@gmail.com>
CC: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Jason Wessel <jason.wessel@windriver.com>

...

This commit is contained in:

Jason Wessel 2010-05-20 21:04:30 -05:00

parent 0b4b3827db

commit 031acd8c42

1 changed files with 28 additions and 2 deletions

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arch/x86/kernel/kgdb.c

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