1 /* 2 * Copyright 2004 James Cleverdon, IBM. 3 * Subject to the GNU Public License, v.2 4 * 5 * Generic APIC sub-arch probe layer. 6 * 7 * Hacked for x86-64 by James Cleverdon from i386 architecture code by 8 * Martin Bligh, Andi Kleen, James Bottomley, John Stultz, and 9 * James Cleverdon. 10 */ 11 #include <linux/threads.h> 12 #include <linux/cpumask.h> 13 #include <linux/string.h> 14 #include <linux/module.h> 15 #include <linux/kernel.h> 16 #include <linux/ctype.h> 17 #include <linux/init.h> 18 #include <linux/hardirq.h> 19 #include <linux/dmar.h> 20 21 #include <asm/smp.h> 22 #include <asm/apic.h> 23 #include <asm/ipi.h> 24 #include <asm/setup.h> 25 26 extern struct apic apic_flat; 27 extern struct apic apic_physflat; 28 extern struct apic apic_x2xpic_uv_x; 29 extern struct apic apic_x2apic_phys; 30 extern struct apic apic_x2apic_cluster; 31 32 struct apic __read_mostly *apic = &apic_flat; 33 EXPORT_SYMBOL_GPL(apic); 34 35 static struct apic *apic_probe[] __initdata = { 36 #ifdef CONFIG_X86_UV 37 &apic_x2apic_uv_x, 38 #endif 39 #ifdef CONFIG_X86_X2APIC 40 &apic_x2apic_phys, 41 &apic_x2apic_cluster, 42 #endif 43 &apic_physflat, 44 NULL, 45 }; 46 47 /* 48 * Check the APIC IDs in bios_cpu_apicid and choose the APIC mode. 49 */ 50 void __init default_setup_apic_routing(void) 51 { 52 #ifdef CONFIG_X86_X2APIC 53 if (x2apic_mode && (apic != &apic_x2apic_phys && 54 #ifdef CONFIG_X86_UV 55 apic != &apic_x2apic_uv_x && 56 #endif 57 apic != &apic_x2apic_cluster)) { 58 if (x2apic_phys) 59 apic = &apic_x2apic_phys; 60 else 61 apic = &apic_x2apic_cluster; 62 printk(KERN_INFO "Setting APIC routing to %s\n", apic->name); 63 } 64 #endif 65 66 if (apic == &apic_flat) { 67 if (max_physical_apicid >= 8) 68 apic = &apic_physflat; 69 printk(KERN_INFO "Setting APIC routing to %s\n", apic->name); 70 } 71 72 /* 73 * Now that apic routing model is selected, configure the 74 * fault handling for intr remapping. 75 */ 76 if (intr_remapping_enabled) 77 enable_drhd_fault_handling(); 78 } 79 80 /* Same for both flat and physical. */ 81 82 void apic_send_IPI_self(int vector) 83 { 84 __default_send_IPI_shortcut(APIC_DEST_SELF, vector, APIC_DEST_PHYSICAL); 85 } 86 87 int __init default_acpi_madt_oem_check(char *oem_id, char *oem_table_id) 88 { 89 int i; 90 91 for (i = 0; apic_probe[i]; ++i) { 92 if (apic_probe[i]->acpi_madt_oem_check(oem_id, oem_table_id)) { 93 apic = apic_probe[i]; 94 printk(KERN_INFO "Setting APIC routing to %s.\n", 95 apic->name); 96 return 1; 97 } 98 } 99 return 0; 100 } 101