1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright 2004 James Cleverdon, IBM. 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/thread_info.h> 12 #include <asm/apic.h> 13 14 #include "local.h" 15 16 /* 17 * Check the APIC IDs in bios_cpu_apicid and choose the APIC mode. 18 */ 19 void __init default_setup_apic_routing(void) 20 { 21 struct apic **drv; 22 23 enable_IR_x2apic(); 24 25 for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) { 26 if ((*drv)->probe && (*drv)->probe()) { 27 if (apic != *drv) { 28 apic = *drv; 29 pr_info("Switched APIC routing to %s.\n", 30 apic->name); 31 } 32 break; 33 } 34 } 35 } 36 37 int __init default_acpi_madt_oem_check(char *oem_id, char *oem_table_id) 38 { 39 struct apic **drv; 40 41 for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) { 42 if ((*drv)->acpi_madt_oem_check(oem_id, oem_table_id)) { 43 if (apic != *drv) { 44 apic = *drv; 45 pr_info("Setting APIC routing to %s.\n", 46 apic->name); 47 } 48 return 1; 49 } 50 } 51 return 0; 52 } 53