238 lines
6.4 KiB
C
238 lines
6.4 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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*
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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 or
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* later.
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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 BogoMIPS 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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* Martin J. Bligh : Added support for multi-quad systems
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* Dave Jones : Report invalid combinations of Athlon CPUs.
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* Rusty Russell : Hacked into shape for new "hotplug" boot process. */
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/sched.h>
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#include <linux/kernel_stat.h>
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#include <linux/bootmem.h>
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#include <linux/notifier.h>
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#include <linux/cpu.h>
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#include <linux/percpu.h>
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#include <linux/nmi.h>
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#include <linux/delay.h>
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#include <linux/mc146818rtc.h>
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#include <asm/tlbflush.h>
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#include <asm/desc.h>
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#include <asm/arch_hooks.h>
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#include <asm/nmi.h>
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#include <mach_apic.h>
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#include <mach_wakecpu.h>
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#include <smpboot_hooks.h>
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#include <asm/vmi.h>
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#include <asm/mtrr.h>
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/* which logical CPU number maps to which CPU (physical APIC ID) */
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u16 x86_cpu_to_apicid_init[NR_CPUS] __initdata =
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{ [0 ... NR_CPUS-1] = BAD_APICID };
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void *x86_cpu_to_apicid_early_ptr;
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DEFINE_PER_CPU(u16, x86_cpu_to_apicid) = BAD_APICID;
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EXPORT_PER_CPU_SYMBOL(x86_cpu_to_apicid);
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u16 x86_bios_cpu_apicid_init[NR_CPUS] __initdata
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= { [0 ... NR_CPUS-1] = BAD_APICID };
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void *x86_bios_cpu_apicid_early_ptr;
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DEFINE_PER_CPU(u16, x86_bios_cpu_apicid) = BAD_APICID;
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EXPORT_PER_CPU_SYMBOL(x86_bios_cpu_apicid);
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u8 apicid_2_node[MAX_APICID];
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extern void map_cpu_to_logical_apicid(void);
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extern void unmap_cpu_to_logical_apicid(int cpu);
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#ifdef CONFIG_HOTPLUG_CPU
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void cpu_exit_clear(void)
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{
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int cpu = raw_smp_processor_id();
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idle_task_exit();
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cpu_uninit();
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irq_ctx_exit(cpu);
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cpu_clear(cpu, cpu_callout_map);
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cpu_clear(cpu, cpu_callin_map);
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unmap_cpu_to_logical_apicid(cpu);
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}
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#endif
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static int boot_cpu_logical_apicid;
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/* Where the IO area was mapped on multiquad, always 0 otherwise */
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void *xquad_portio;
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#ifdef CONFIG_X86_NUMAQ
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EXPORT_SYMBOL(xquad_portio);
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#endif
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static void __init disable_smp(void)
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{
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cpu_possible_map = cpumask_of_cpu(0);
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cpu_present_map = cpumask_of_cpu(0);
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smpboot_clear_io_apic_irqs();
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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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map_cpu_to_logical_apicid();
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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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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(KERN_WARNING "weird, boot CPU (#%d) not listed"
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"by the BIOS.\n", 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 && !acpi_lapic) {
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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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* Makes no sense to do this check in clustered apic mode, so skip it
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*/
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if (!check_phys_apicid_present(boot_cpu_physical_apicid)) {
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printk("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 (APIC_INTEGRATED(apic_version[boot_cpu_physical_apicid]) && !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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smpboot_clear_io_apic();
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return -1;
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}
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verify_local_APIC();
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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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smp_found_config = 0;
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printk(KERN_INFO "SMP mode deactivated, forcing use of dummy APIC emulation.\n");
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if (nmi_watchdog == NMI_LOCAL_APIC) {
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printk(KERN_INFO "activating minimal APIC for NMI watchdog use.\n");
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connect_bsp_APIC();
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setup_local_APIC();
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end_local_APIC_setup();
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}
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smpboot_clear_io_apic();
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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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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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current_cpu_data = boot_cpu_data;
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cpu_callin_map = cpumask_of_cpu(0);
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mb();
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/*
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* Setup boot CPU information
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*/
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smp_store_cpu_info(0); /* Final full version of the data */
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boot_cpu_logical_apicid = logical_smp_processor_id();
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current_thread_info()->cpu = 0;
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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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connect_bsp_APIC();
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setup_local_APIC();
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end_local_APIC_setup();
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map_cpu_to_logical_apicid();
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setup_portio_remap();
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smpboot_setup_io_apic();
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printk(KERN_INFO "CPU%d: ", 0);
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print_cpu_info(&cpu_data(0));
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setup_boot_clock();
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}
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