From fcd5ace00b333ce31b11b02a2243dfbf39307f10 Mon Sep 17 00:00:00 2001
From: Eric Biederman <ebiederm@xmission.com>
Date: Thu, 14 Oct 2004 19:29:29 +0000
Subject: - Add new cvs code to cvs

git-svn-id: svn://svn.coreboot.org/coreboot/trunk@1657 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
---
 src/cpu/intel/hyperthreading/Config.lb       |  1 +
 src/cpu/intel/hyperthreading/intel_sibling.c | 74 ++++++++++++++++++++++++++++
 2 files changed, 75 insertions(+)
 create mode 100644 src/cpu/intel/hyperthreading/Config.lb
 create mode 100644 src/cpu/intel/hyperthreading/intel_sibling.c

(limited to 'src/cpu/intel/hyperthreading')

diff --git a/src/cpu/intel/hyperthreading/Config.lb b/src/cpu/intel/hyperthreading/Config.lb
new file mode 100644
index 0000000000..dce4044835
--- /dev/null
+++ b/src/cpu/intel/hyperthreading/Config.lb
@@ -0,0 +1 @@
+object intel_sibling.o
diff --git a/src/cpu/intel/hyperthreading/intel_sibling.c b/src/cpu/intel/hyperthreading/intel_sibling.c
new file mode 100644
index 0000000000..001fea81b2
--- /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);
+	}
+	
+}
+
-- 
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