kern/amd64: mp: Ensure core is online capable

Section 5.2.12.2, table 5.23 of the ACPI spec states that the flags
needs to have the enabled bit [0] or online capable bit [1] set for
startup, otherwise it should just be ignored.

Signed-off-by: Ian Moffett <ian@osmora.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/sys/arch/amd64/cpu/mp.c b/sys/arch/amd64/cpu/mp.c
index 09c824e..ae40025 100644
--- a/sys/arch/amd64/cpu/mp.c
+++ b/sys/arch/amd64/cpu/mp.c
@@ -73,6 +73,11 @@ cpu_lapic_cb(struct apic_header *h, size_t arg)
         return -1;
     }
 
+    /* If not online capable, continue */
+    if (!ISSET(lapic->flags, 0x3)) {
+        return -1;
+    }
+
     /* Prepare the IPI packet */
     ipi.dest_id = lapic->apic_id;
     ipi.vector = 0;