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authorK.Prasad <prasad@linux.vnet.ibm.com>2010-01-28 14:14:01 +0300
committerFrederic Weisbecker <fweisbec@gmail.com>2010-01-29 04:26:10 +0300
commit40f9249a73f6c251adea492b1c3d19d39e2a9bda (patch)
treec60a605bdd1ca6981de926234dffd93a3f9b970f /arch/x86/include/asm/debugreg.h
parent1e12a4a7a3a78bc9c3aaf3486dde3b8ab1cdf465 (diff)
downloadlinux-40f9249a73f6c251adea492b1c3d19d39e2a9bda.tar.xz
x86/debug: Clear reserved bits of DR6 in do_debug()
Clear the reserved bits from the stored copy of debug status register (DR6). This will help easy bitwise operations such as quick testing of a debug event origin. Signed-off-by: K.Prasad <prasad@linux.vnet.ibm.com> Cc: Roland McGrath <roland@redhat.com> Cc: Jan Kiszka <jan.kiszka@siemens.com> Cc: Alan Stern <stern@rowland.harvard.edu> Cc: Ingo Molnar <mingo@elte.hu> LKML-Reference: <20100128111401.GB13935@in.ibm.com> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Diffstat (limited to 'arch/x86/include/asm/debugreg.h')
-rw-r--r--arch/x86/include/asm/debugreg.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/include/asm/debugreg.h b/arch/x86/include/asm/debugreg.h
index 8240f76b531e..b81002f23614 100644
--- a/arch/x86/include/asm/debugreg.h
+++ b/arch/x86/include/asm/debugreg.h
@@ -14,6 +14,9 @@
which debugging register was responsible for the trap. The other bits
are either reserved or not of interest to us. */
+/* Define reserved bits in DR6 which are always set to 1 */
+#define DR6_RESERVED (0xFFFF0FF0)
+
#define DR_TRAP0 (0x1) /* db0 */
#define DR_TRAP1 (0x2) /* db1 */
#define DR_TRAP2 (0x4) /* db2 */