9d62e7e75e
Fix the following errors and warnings detected by checkpatch.pl:
ERROR: spaces required around that '=' (ctx:VxV)
ERROR: space required after that ',' (ctx:VxV)
ERROR: space prohibited after that open parenthesis '('
ERROR: space prohibited before that close parenthesis ')'
ERROR: need consistent spacing around '-' (ctx:WxV)
ERROR: spaces required around that '>' (ctx:VxV)
ERROR: need consistent spacing around '>>' (ctx:WxV)
ERROR: need consistent spacing around '<<' (ctx:VxW)
ERROR: spaces required around that '||' (ctx:VxV)
ERROR: "foo * bar" should be "foo *bar"
ERROR: "(foo*)" should be "(foo *)"
WARNING: space prohibited between function name and open parenthesis '('
WARNING: storage class should be at the beginning of the declaration
TEST=Build and run on Galileo Gen2
Change-Id: I6602fbc8602171ab6c2f3b6c204558ad2c811179
Signed-off-by: Lee Leahy <Leroy.P.Leahy@intel.com>
Reviewed-on: https://review.coreboot.org/18847
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
110 lines
2.6 KiB
C
110 lines
2.6 KiB
C
/*
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* This file is part of the coreboot project.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#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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#include <assert.h>
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#if CONFIG_PARALLEL_CPU_INIT
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#error Intel hyper-threading requires serialized CPU init
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#endif
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static int first_time = 1;
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static int disable_siblings = !CONFIG_LOGICAL_CPUS;
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/* Return true if running thread does not have the smallest lapic ID
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* within a CPU core.
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*/
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int intel_ht_sibling(void)
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{
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unsigned int core_ids, apic_ids, threads;
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apic_ids = 1;
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if (cpuid_eax(0) >= 1)
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apic_ids = (cpuid_ebx(1) >> 16) & 0xff;
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if (apic_ids < 1)
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apic_ids = 1;
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core_ids = 1;
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if (cpuid_eax(0) >= 4) {
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struct cpuid_result result;
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result = cpuid_ext(4, 0);
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core_ids += (result.eax >> 26) & 0x3f;
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}
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threads = (apic_ids / core_ids);
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return !!(lapicid() & (threads-1));
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}
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void intel_sibling_init(struct device *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 hyperthreading 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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printk(BIOS_DEBUG, "CPU: %u %d siblings\n",
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cpu->path.apic.apic_id,
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siblings);
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/* See if I am a sibling cpu */
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if (cpu->path.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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struct device *new;
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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.apic.apic_id = cpu->path.apic.apic_id + i;
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/* Allocate new CPU device structure iff sibling CPU
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* was not in static device tree.
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*/
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new = alloc_find_dev(cpu->bus, &cpu_path);
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if (!new) {
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continue;
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}
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printk(BIOS_DEBUG, "CPU: %u has sibling %u\n",
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cpu->path.apic.apic_id,
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new->path.apic.apic_id);
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}
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}
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