x86: display extended apic registers with print_local_APIC and cpu_debug code
Both print_local_APIC (used when apic=debug kernel param is set) and
cpu_debug code missed support for some extended APIC registers that
I'd like to see.
This adds support to show:
- extended APIC feature register
- extended APIC control register
- extended LVT registers
[ Impact: print more debug info ]
Signed-off-by: Andreas Herrmann <andreas.herrmann3@amd.com>
Cc: Jaswinder Singh Rajput <jaswinder@kernel.org>
Cc: Cyrill Gorcunov <gorcunov@openvz.org>
LKML-Reference: <20090508162350.GO29045@alberich.amd.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/arch/x86/kernel/cpu/cpu_debug.c b/arch/x86/kernel/cpu/cpu_debug.c
index 46e29ab..2fc4f6b 100644
--- a/arch/x86/kernel/cpu/cpu_debug.c
+++ b/arch/x86/kernel/cpu/cpu_debug.c
@@ -588,8 +588,20 @@
seq_printf(seq, " TMICT\t\t: %08x\n", apic_read(APIC_TMICT));
seq_printf(seq, " TMCCT\t\t: %08x\n", apic_read(APIC_TMCCT));
seq_printf(seq, " TDCR\t\t: %08x\n", apic_read(APIC_TDCR));
-#endif /* CONFIG_X86_LOCAL_APIC */
+ if (boot_cpu_has(X86_FEATURE_EXTAPIC)) {
+ unsigned int i, v, maxeilvt;
+ v = apic_read(APIC_EFEAT);
+ maxeilvt = (v >> 16) & 0xff;
+ seq_printf(seq, " EFEAT\t\t: %08x\n", v);
+ seq_printf(seq, " ECTRL\t\t: %08x\n", apic_read(APIC_ECTRL));
+
+ for (i = 0; i < maxeilvt; i++) {
+ v = apic_read(APIC_EILVTn(i));
+ seq_printf(seq, " EILVT%d\t\t: %08x\n", i, v);
+ }
+ }
+#endif /* CONFIG_X86_LOCAL_APIC */
seq_printf(seq, "\n MSR\t:\n");
}