it's reverse of apicid_from_topo_ids() and will be used in follow up
patches to fill in data structures for query-hotpluggable-cpus and
for user friendly error reporting
Signed-off-by: Igor Mammedov <imamm...@redhat.com>
---
include/hw/i386/topology.h | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/include/hw/i386/topology.h b/include/hw/i386/topology.h
index fc95572..1ebaee0 100644
--- a/include/hw/i386/topology.h
+++ b/include/hw/i386/topology.h
@@ -117,6 +117,21 @@ static inline void x86_topo_ids_from_idx(unsigned nr_cores,
topo->pkg_id = core_index / nr_cores;
}
+/* Calculate thread/core/package IDs for a specific topology,
+ * based on APIC ID
+ */
+static inline void x86_topo_ids_from_apicid(apic_id_t apicid,
+ unsigned nr_cores,
+ unsigned nr_threads,
+ X86CPUTopoInfo *topo)
+{
+ topo->smt_id = apicid &
+ ~(0xFFFFFFFFUL << apicid_smt_width(nr_cores, nr_threads));
+ topo->core_id = (apicid >> apicid_core_offset(nr_cores, nr_threads)) &
+ ~(0xFFFFFFFFUL << apicid_core_width(nr_cores, nr_threads));
+ topo->pkg_id = apicid >> apicid_pkg_offset(nr_cores, nr_threads);
+}
+
/* Make APIC ID for the CPU 'cpu_index'
*
* 'cpu_index' is a sequential, contiguous ID for the CPU.
--
2.7.0
