commit 031acd8c42edd61070f81c51edc89e83147a3d0e
author Jason Wessel <jason.wessel@windriver.com> Thu May 20 21:04:30 2010 -0500
committer Jason Wessel <jason.wessel@windriver.com> Thu May 20 21:04:30 2010 -0500
tree f0f848ca6b19ec049b00a430bb0fba1035acb76b
parent 0b4b3827db386ec6034a5aba1261025b039440c2

x86,kgdb: Implement early hardware breakpoint debugging

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>