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/threads.h> 12 #include <linux/cpumask.h> 13 #include <linux/string.h> 14 #include <linux/init.h> 15 #include <linux/kernel.h> 16 #include <linux/ctype.h> 17 #include <linux/hardirq.h> 18 #include <linux/dmar.h> 19 20 #include <asm/smp.h> 21 #include <asm/apic.h> 22 #include <asm/ipi.h> 23 #include <asm/setup.h> 24 25 /* 26 * Check the APIC IDs in bios_cpu_apicid and choose the APIC mode. 27 */ 28 void __init default_setup_apic_routing(void) 29 { 30 struct apic **drv; 31 32 enable_IR_x2apic(); 33 34 for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) { 35 if ((*drv)->probe && (*drv)->probe()) { 36 if (apic != *drv) { 37 apic = *drv; 38 pr_info("Switched APIC routing to %s.\n", 39 apic->name); 40 } 41 break; 42 } 43 } 44 45 if (x86_platform.apic_post_init) 46 x86_platform.apic_post_init(); 47 } 48 49 /* Same for both flat and physical. */ 50 51 void apic_send_IPI_self(int vector) 52 { 53 __default_send_IPI_shortcut(APIC_DEST_SELF, vector, APIC_DEST_PHYSICAL); 54 } 55 56 int __init default_acpi_madt_oem_check(char *oem_id, char *oem_table_id) 57 { 58 struct apic **drv; 59 60 for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) { 61 if ((*drv)->acpi_madt_oem_check(oem_id, oem_table_id)) { 62 if (apic != *drv) { 63 apic = *drv; 64 pr_info("Setting APIC routing to %s.\n", 65 apic->name); 66 } 67 return 1; 68 } 69 } 70 return 0; 71 } 72