- Add new cvs code to cvs
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@1657 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
diff --git a/src/cpu/intel/hyperthreading/intel_sibling.c b/src/cpu/intel/hyperthreading/intel_sibling.c
new file mode 100644
index 0000000..001fea8
--- /dev/null
+++ b/src/cpu/intel/hyperthreading/intel_sibling.c
@@ -0,0 +1,74 @@
+#include <console/console.h>
+#include <cpu/cpu.h>
+#include <cpu/x86/lapic.h>
+#include <cpu/intel/hyperthreading.h>
+#include <device/device.h>
+#include <pc80/mc146818rtc.h>
+#include <smp/spinlock.h>
+
+static int first_time = 1;
+static int disable_siblings = !CONFIG_LOGICAL_CPUS;
+
+void intel_sibling_init(device_t cpu)
+{
+ unsigned i, siblings;
+ struct cpuid_result result;
+
+ /* On the bootstrap processor see if I want sibling cpus enabled */
+ if (first_time) {
+ first_time = 0;
+ get_option(&disable_siblings, "hyper_threading");
+ }
+ result = cpuid(1);
+ /* Is hypethreading supported */
+ if (!(result.edx & (1 << 28))) {
+ return;
+ }
+ /* See how many sibling cpus we have */
+ siblings = (result.ebx >> 16) & 0xff;
+ if (siblings < 1) {
+ siblings = 1;
+ }
+
+#if 1
+ printk_debug("CPU: %u %d siblings\n",
+ cpu->path.u.apic.apic_id,
+ siblings);
+#endif
+
+ /* See if I am a sibling cpu */
+ if (cpu->path.u.apic.apic_id & (siblings -1)) {
+ if (disable_siblings) {
+ cpu->enabled = 0;
+ }
+ return;
+ }
+
+ /* I am the primary cpu start up my siblings */
+ for(i = 1; i < siblings; i++) {
+ struct device_path cpu_path;
+ device_t new;
+ unsigned long count;
+ /* Build the cpu device path */
+ cpu_path.type = DEVICE_PATH_APIC;
+ cpu_path.u.apic.apic_id = cpu->path.u.apic.apic_id + i;
+
+
+ /* Allocate the new cpu device structure */
+ new = alloc_dev(cpu->bus, &cpu_path);
+
+ if (!new) {
+ continue;
+ }
+
+#if 1
+ printk_debug("CPU: %u has sibling %u\n",
+ cpu->path.u.apic.apic_id,
+ new->path.u.apic.apic_id);
+#endif
+ /* Start the new cpu */
+ start_cpu(new);
+ }
+
+}
+