/* * x86 SMP booting functions * * (c) 1995 Alan Cox, Building #3 * (c) 1998, 1999, 2000 Ingo Molnar * * Much of the core SMP work is based on previous work by Thomas Radke, to * whom a great many thanks are extended. * * Thanks to Intel for making available several different Pentium, * Pentium Pro and Pentium-II/Xeon MP machines. * Original development of Linux SMP code supported by Caldera. * * This code is released under the GNU General Public License version 2 or * later. * * Fixes * Felix Koop : NR_CPUS used properly * Jose Renau : Handle single CPU case. * Alan Cox : By repeated request 8) - Total BogoMIPS report. * Greg Wright : Fix for kernel stacks panic. * Erich Boleyn : MP v1.4 and additional changes. * Matthias Sattler : Changes for 2.1 kernel map. * Michel Lespinasse : Changes for 2.1 kernel map. * Michael Chastain : Change trampoline.S to gnu as. * Alan Cox : Dumb bug: 'B' step PPro's are fine * Ingo Molnar : Added APIC timers, based on code * from Jose Renau * Ingo Molnar : various cleanups and rewrites * Tigran Aivazian : fixed "0.00 in /proc/uptime on SMP" bug. * Maciej W. Rozycki : Bits for genuine 82489DX APICs * Martin J. Bligh : Added support for multi-quad systems * Dave Jones : Report invalid combinations of Athlon CPUs. * Rusty Russell : Hacked into shape for new "hotplug" boot process. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* which logical CPU number maps to which CPU (physical APIC ID) */ u16 x86_cpu_to_apicid_init[NR_CPUS] __initdata = { [0 ... NR_CPUS-1] = BAD_APICID }; void *x86_cpu_to_apicid_early_ptr; DEFINE_PER_CPU(u16, x86_cpu_to_apicid) = BAD_APICID; EXPORT_PER_CPU_SYMBOL(x86_cpu_to_apicid); u16 x86_bios_cpu_apicid_init[NR_CPUS] __initdata = { [0 ... NR_CPUS-1] = BAD_APICID }; void *x86_bios_cpu_apicid_early_ptr; DEFINE_PER_CPU(u16, x86_bios_cpu_apicid) = BAD_APICID; EXPORT_PER_CPU_SYMBOL(x86_bios_cpu_apicid); u8 apicid_2_node[MAX_APICID]; extern void map_cpu_to_logical_apicid(void); extern void unmap_cpu_to_logical_apicid(int cpu); /* State of each CPU. */ DEFINE_PER_CPU(int, cpu_state) = { 0 }; #ifdef CONFIG_HOTPLUG_CPU void cpu_exit_clear(void) { int cpu = raw_smp_processor_id(); idle_task_exit(); cpu_uninit(); irq_ctx_exit(cpu); cpu_clear(cpu, cpu_callout_map); cpu_clear(cpu, cpu_callin_map); unmap_cpu_to_logical_apicid(cpu); } #endif static int boot_cpu_logical_apicid; /* Where the IO area was mapped on multiquad, always 0 otherwise */ void *xquad_portio; #ifdef CONFIG_X86_NUMAQ EXPORT_SYMBOL(xquad_portio); #endif static void __init disable_smp(void) { cpu_possible_map = cpumask_of_cpu(0); cpu_present_map = cpumask_of_cpu(0); smpboot_clear_io_apic_irqs(); phys_cpu_present_map = physid_mask_of_physid(0); map_cpu_to_logical_apicid(); cpu_set(0, per_cpu(cpu_sibling_map, 0)); cpu_set(0, per_cpu(cpu_core_map, 0)); } static int __init smp_sanity_check(unsigned max_cpus) { /* * If we couldn't find an SMP configuration at boot time, * get out of here now! */ if (!smp_found_config && !acpi_lapic) { printk(KERN_NOTICE "SMP motherboard not detected.\n"); disable_smp(); if (APIC_init_uniprocessor()) printk(KERN_NOTICE "Local APIC not detected." " Using dummy APIC emulation.\n"); return -1; } /* * Should not be necessary because the MP table should list the boot * CPU too, but we do it for the sake of robustness anyway. * Makes no sense to do this check in clustered apic mode, so skip it */ if (!check_phys_apicid_present(boot_cpu_physical_apicid)) { printk("weird, boot CPU (#%d) not listed by the BIOS.\n", boot_cpu_physical_apicid); physid_set(hard_smp_processor_id(), phys_cpu_present_map); } /* * If we couldn't find a local APIC, then get out of here now! */ if (APIC_INTEGRATED(apic_version[boot_cpu_physical_apicid]) && !cpu_has_apic) { printk(KERN_ERR "BIOS bug, local APIC #%d not detected!...\n", boot_cpu_physical_apicid); printk(KERN_ERR "... forcing use of dummy APIC emulation. (tell your hw vendor)\n"); return -1; } verify_local_APIC(); /* * If SMP should be disabled, then really disable it! */ if (!max_cpus) { smp_found_config = 0; printk(KERN_INFO "SMP mode deactivated, forcing use of dummy APIC emulation.\n"); if (nmi_watchdog == NMI_LOCAL_APIC) { printk(KERN_INFO "activating minimal APIC for NMI watchdog use.\n"); connect_bsp_APIC(); setup_local_APIC(); end_local_APIC_setup(); } return -1; } return 0; } /* * Cycle through the processors sending APIC IPIs to boot each. */ static void __init smp_boot_cpus(unsigned int max_cpus) { /* * Setup boot CPU information */ smp_store_cpu_info(0); /* Final full version of the data */ printk(KERN_INFO "CPU%d: ", 0); print_cpu_info(&cpu_data(0)); boot_cpu_physical_apicid = GET_APIC_ID(apic_read(APIC_ID)); boot_cpu_logical_apicid = logical_smp_processor_id(); current_thread_info()->cpu = 0; set_cpu_sibling_map(0); if (smp_sanity_check(max_cpus) < 0) { printk(KERN_INFO "SMP disabled\n"); disable_smp(); return; } connect_bsp_APIC(); setup_local_APIC(); end_local_APIC_setup(); map_cpu_to_logical_apicid(); setup_portio_remap(); smpboot_setup_io_apic(); setup_boot_clock(); } /* These are wrappers to interface to the new boot process. Someone who understands all this stuff should rewrite it properly. --RR 15/Jul/02 */ void __init native_smp_prepare_cpus(unsigned int max_cpus) { nmi_watchdog_default(); cpu_callin_map = cpumask_of_cpu(0); mb(); smp_boot_cpus(max_cpus); } void __init native_smp_prepare_boot_cpu(void) { unsigned int cpu = smp_processor_id(); init_gdt(cpu); switch_to_new_gdt(); cpu_set(cpu, cpu_callout_map); __get_cpu_var(cpu_state) = CPU_ONLINE; } extern void impress_friends(void); extern void smp_checks(void); void __init native_smp_cpus_done(unsigned int max_cpus) { /* * Cleanup possible dangling ends... */ smpboot_restore_warm_reset_vector(); Dprintk("Boot done.\n"); impress_friends(); smp_checks(); #ifdef CONFIG_X86_IO_APIC setup_ioapic_dest(); #endif check_nmi_watchdog(); zap_low_mappings(); }