fcd5ace00b
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@1657 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
75 lines
1.5 KiB
C
75 lines
1.5 KiB
C
#include <console/console.h>
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#include <cpu/cpu.h>
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#include <cpu/x86/lapic.h>
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#include <cpu/intel/hyperthreading.h>
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#include <device/device.h>
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#include <pc80/mc146818rtc.h>
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#include <smp/spinlock.h>
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static int first_time = 1;
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static int disable_siblings = !CONFIG_LOGICAL_CPUS;
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void intel_sibling_init(device_t cpu)
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{
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unsigned i, siblings;
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struct cpuid_result result;
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/* On the bootstrap processor see if I want sibling cpus enabled */
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if (first_time) {
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first_time = 0;
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get_option(&disable_siblings, "hyper_threading");
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}
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result = cpuid(1);
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/* Is hypethreading supported */
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if (!(result.edx & (1 << 28))) {
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return;
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}
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/* See how many sibling cpus we have */
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siblings = (result.ebx >> 16) & 0xff;
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if (siblings < 1) {
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siblings = 1;
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}
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#if 1
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printk_debug("CPU: %u %d siblings\n",
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cpu->path.u.apic.apic_id,
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siblings);
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#endif
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/* See if I am a sibling cpu */
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if (cpu->path.u.apic.apic_id & (siblings -1)) {
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if (disable_siblings) {
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cpu->enabled = 0;
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}
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return;
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}
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/* I am the primary cpu start up my siblings */
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for(i = 1; i < siblings; i++) {
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struct device_path cpu_path;
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device_t new;
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unsigned long count;
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/* Build the cpu device path */
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cpu_path.type = DEVICE_PATH_APIC;
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cpu_path.u.apic.apic_id = cpu->path.u.apic.apic_id + i;
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/* Allocate the new cpu device structure */
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new = alloc_dev(cpu->bus, &cpu_path);
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if (!new) {
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continue;
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}
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#if 1
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printk_debug("CPU: %u has sibling %u\n",
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cpu->path.u.apic.apic_id,
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new->path.u.apic.apic_id);
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#endif
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/* Start the new cpu */
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start_cpu(new);
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}
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}
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