diff options
Diffstat (limited to 'arch/i386/kernel/smpboot.c')
| -rw-r--r-- | arch/i386/kernel/smpboot.c | 68 |
1 files changed, 52 insertions, 16 deletions
diff --git a/arch/i386/kernel/smpboot.c b/arch/i386/kernel/smpboot.c index 5a2bbe0c4fff..01b618e73ecd 100644 --- a/arch/i386/kernel/smpboot.c +++ b/arch/i386/kernel/smpboot.c @@ -1078,16 +1078,6 @@ void *xquad_portio; EXPORT_SYMBOL(xquad_portio); #endif -/* - * Fall back to non SMP mode after errors. - * - */ -static __init void disable_smp(void) -{ - cpu_set(0, cpu_sibling_map[0]); - cpu_set(0, cpu_core_map[0]); -} - static void __init smp_boot_cpus(unsigned int max_cpus) { int apicid, cpu, bit, kicked; @@ -1100,6 +1090,7 @@ static void __init smp_boot_cpus(unsigned int max_cpus) printk("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(); x86_cpu_to_apicid[0] = boot_cpu_physical_apicid; @@ -1111,27 +1102,68 @@ static void __init smp_boot_cpus(unsigned int max_cpus) cpus_clear(cpu_core_map[0]); cpu_set(0, cpu_core_map[0]); - map_cpu_to_logical_apicid(); - /* * 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(); + smpboot_clear_io_apic_irqs(); + phys_cpu_present_map = physid_mask_of_physid(0); + if (APIC_init_uniprocessor()) + printk(KERN_NOTICE "Local APIC not detected." + " Using dummy APIC emulation.\n"); + map_cpu_to_logical_apicid(); + cpu_set(0, cpu_sibling_map[0]); + cpu_set(0, cpu_core_map[0]); + return; + } + + /* + * 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"); + smpboot_clear_io_apic_irqs(); + phys_cpu_present_map = physid_mask_of_physid(0); + cpu_set(0, cpu_sibling_map[0]); + cpu_set(0, cpu_core_map[0]); return; } + verify_local_APIC(); + /* * If SMP should be disabled, then really disable it! */ - if (!max_cpus || (enable_local_apic < 0)) { - printk(KERN_INFO "SMP mode deactivated.\n"); - disable_smp(); + if (!max_cpus) { + smp_found_config = 0; + printk(KERN_INFO "SMP mode deactivated, forcing use of dummy APIC emulation.\n"); + smpboot_clear_io_apic_irqs(); + phys_cpu_present_map = physid_mask_of_physid(0); + cpu_set(0, cpu_sibling_map[0]); + cpu_set(0, cpu_core_map[0]); return; } + connect_bsp_APIC(); + setup_local_APIC(); + map_cpu_to_logical_apicid(); + + setup_portio_remap(); /* @@ -1212,6 +1244,10 @@ static void __init smp_boot_cpus(unsigned int max_cpus) cpu_set(0, cpu_sibling_map[0]); cpu_set(0, cpu_core_map[0]); + smpboot_setup_io_apic(); + + setup_boot_APIC_clock(); + /* * Synchronize the TSC with the AP */ |