1db17f5534
An APIC test is moved, and code is replaced by the mach-default already defined function (smpboot_setup_io_apic). setup_portio_remap() is added, but it is a nop in mach-default. Signed-off-by: Glauber Costa <gcosta@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
211 lines
5.6 KiB
C
211 lines
5.6 KiB
C
/*
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* x86 SMP booting functions
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*
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* (c) 1995 Alan Cox, Building #3 <alan@redhat.com>
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* (c) 1998, 1999, 2000 Ingo Molnar <mingo@redhat.com>
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* Copyright 2001 Andi Kleen, SuSE Labs.
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*
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* Much of the core SMP work is based on previous work by Thomas Radke, to
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* whom a great many thanks are extended.
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*
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* Thanks to Intel for making available several different Pentium,
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* Pentium Pro and Pentium-II/Xeon MP machines.
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* Original development of Linux SMP code supported by Caldera.
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*
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* This code is released under the GNU General Public License version 2
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*
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* Fixes
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* Felix Koop : NR_CPUS used properly
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* Jose Renau : Handle single CPU case.
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* Alan Cox : By repeated request 8) - Total BogoMIP report.
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* Greg Wright : Fix for kernel stacks panic.
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* Erich Boleyn : MP v1.4 and additional changes.
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* Matthias Sattler : Changes for 2.1 kernel map.
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* Michel Lespinasse : Changes for 2.1 kernel map.
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* Michael Chastain : Change trampoline.S to gnu as.
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* Alan Cox : Dumb bug: 'B' step PPro's are fine
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* Ingo Molnar : Added APIC timers, based on code
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* from Jose Renau
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* Ingo Molnar : various cleanups and rewrites
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* Tigran Aivazian : fixed "0.00 in /proc/uptime on SMP" bug.
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* Maciej W. Rozycki : Bits for genuine 82489DX APICs
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* Andi Kleen : Changed for SMP boot into long mode.
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* Rusty Russell : Hacked into shape for new "hotplug" boot process.
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* Andi Kleen : Converted to new state machine.
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* Various cleanups.
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* Probably mostly hotplug CPU ready now.
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* Ashok Raj : CPU hotplug support
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*/
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#include <linux/init.h>
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#include <linux/mm.h>
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#include <linux/kernel_stat.h>
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#include <linux/bootmem.h>
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#include <linux/thread_info.h>
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#include <linux/module.h>
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#include <linux/delay.h>
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#include <linux/mc146818rtc.h>
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#include <linux/smp.h>
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#include <linux/kdebug.h>
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#include <asm/mtrr.h>
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#include <asm/pgalloc.h>
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#include <asm/desc.h>
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#include <asm/tlbflush.h>
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#include <asm/proto.h>
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#include <asm/nmi.h>
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#include <asm/irq.h>
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#include <asm/hw_irq.h>
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#include <asm/numa.h>
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#include <mach_wakecpu.h>
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#include <mach_apic.h>
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#include <smpboot_hooks.h>
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#include <mach_apic.h>
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/* Set when the idlers are all forked */
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int smp_threads_ready;
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cycles_t cacheflush_time;
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unsigned long cache_decay_ticks;
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static int boot_cpu_logical_apicid;
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/*
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* Fall back to non SMP mode after errors.
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*
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* RED-PEN audit/test this more. I bet there is more state messed up here.
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*/
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static __init void disable_smp(void)
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{
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cpu_present_map = cpumask_of_cpu(0);
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cpu_possible_map = cpumask_of_cpu(0);
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if (smp_found_config)
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phys_cpu_present_map =
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physid_mask_of_physid(boot_cpu_physical_apicid);
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else
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phys_cpu_present_map = physid_mask_of_physid(0);
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cpu_set(0, per_cpu(cpu_sibling_map, 0));
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cpu_set(0, per_cpu(cpu_core_map, 0));
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}
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/*
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* Various sanity checks.
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*/
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static int __init smp_sanity_check(unsigned max_cpus)
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{
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if (!physid_isset(hard_smp_processor_id(), phys_cpu_present_map)) {
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printk("weird, boot CPU (#%d) not listed by the BIOS.\n",
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hard_smp_processor_id());
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physid_set(hard_smp_processor_id(), phys_cpu_present_map);
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}
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/*
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* If we couldn't find an SMP configuration at boot time,
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* get out of here now!
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*/
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if (!smp_found_config) {
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printk(KERN_NOTICE "SMP motherboard not detected.\n");
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disable_smp();
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if (APIC_init_uniprocessor())
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printk(KERN_NOTICE "Local APIC not detected."
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" Using dummy APIC emulation.\n");
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return -1;
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}
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/*
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* Should not be necessary because the MP table should list the boot
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* CPU too, but we do it for the sake of robustness anyway.
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*/
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if (!physid_isset(boot_cpu_physical_apicid, phys_cpu_present_map)) {
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printk(KERN_NOTICE
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"weird, boot CPU (#%d) not listed by the BIOS.\n",
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boot_cpu_physical_apicid);
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physid_set(hard_smp_processor_id(), phys_cpu_present_map);
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}
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/*
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* If we couldn't find a local APIC, then get out of here now!
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*/
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if (!cpu_has_apic) {
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printk(KERN_ERR "BIOS bug, local APIC #%d not detected!...\n",
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boot_cpu_physical_apicid);
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printk(KERN_ERR "... forcing use of dummy APIC emulation. (tell your hw vendor)\n");
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nr_ioapics = 0;
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return -1;
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}
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/*
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* If SMP should be disabled, then really disable it!
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*/
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if (!max_cpus) {
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printk(KERN_INFO "SMP mode deactivated, forcing use of dummy APIC emulation.\n");
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nr_ioapics = 0;
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return -1;
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}
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return 0;
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}
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static void __init smp_cpu_index_default(void)
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{
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int i;
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struct cpuinfo_x86 *c;
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for_each_cpu_mask(i, cpu_possible_map) {
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c = &cpu_data(i);
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/* mark all to hotplug */
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c->cpu_index = NR_CPUS;
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}
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}
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/*
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* Prepare for SMP bootup. The MP table or ACPI has been read
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* earlier. Just do some sanity checking here and enable APIC mode.
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*/
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void __init native_smp_prepare_cpus(unsigned int max_cpus)
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{
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nmi_watchdog_default();
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smp_cpu_index_default();
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cpu_callin_map = cpumask_of_cpu(0);
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mb();
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current_cpu_data = boot_cpu_data;
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boot_cpu_logical_apicid = logical_smp_processor_id();
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current_thread_info()->cpu = 0; /* needed? */
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set_cpu_sibling_map(0);
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if (smp_sanity_check(max_cpus) < 0) {
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printk(KERN_INFO "SMP disabled\n");
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disable_smp();
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return;
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}
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if (GET_APIC_ID(apic_read(APIC_ID)) != boot_cpu_physical_apicid) {
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panic("Boot APIC ID in local APIC unexpected (%d vs %d)",
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GET_APIC_ID(apic_read(APIC_ID)), boot_cpu_physical_apicid);
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/* Or can we switch back to PIC here? */
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}
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/*
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* Switch from PIC to APIC mode.
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*/
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setup_local_APIC();
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/*
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* Enable IO APIC before setting up error vector
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*/
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if (!skip_ioapic_setup && nr_ioapics)
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enable_IO_APIC();
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end_local_APIC_setup();
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/*
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* Set up local APIC timer on boot CPU.
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*/
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setup_boot_clock();
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printk(KERN_INFO "CPU%d: ", 0);
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print_cpu_info(&cpu_data(0));
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}
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