2 * Default generic APIC driver. This handles up to 8 CPUs.
4 * Copyright 2003 Andi Kleen, SuSE Labs.
5 * Subject to the GNU Public License, v.2
7 * Generic x86 APIC driver probe layer.
9 #include <linux/threads.h>
10 #include <linux/cpumask.h>
11 #include <linux/module.h>
12 #include <linux/string.h>
13 #include <linux/kernel.h>
14 #include <linux/ctype.h>
15 #include <linux/init.h>
16 #include <linux/errno.h>
17 #include <asm/fixmap.h>
18 #include <asm/mpspec.h>
19 #include <asm/apicdef.h>
21 #include <asm/setup.h>
23 #include <linux/smp.h>
26 #include <linux/interrupt.h>
30 #ifdef CONFIG_HOTPLUG_CPU
31 #define DEFAULT_SEND_IPI (1)
33 #define DEFAULT_SEND_IPI (0)
36 int no_broadcast = DEFAULT_SEND_IPI;
38 static __init int no_ipi_broadcast(char *str)
40 get_option(&str, &no_broadcast);
41 pr_info("Using %s mode\n",
42 no_broadcast ? "No IPI Broadcast" : "IPI Broadcast");
45 __setup("no_ipi_broadcast=", no_ipi_broadcast);
47 static int __init print_ipi_mode(void)
49 pr_info("Using IPI %s mode\n",
50 no_broadcast ? "No-Shortcut" : "Shortcut");
53 late_initcall(print_ipi_mode);
55 static int default_x86_32_early_logical_apicid(int cpu)
60 static void setup_apic_flat_routing(void)
62 #ifdef CONFIG_X86_IO_APIC
64 "Enabling APIC mode: Flat. Using %d I/O APICs\n",
69 /* should be called last. */
70 static int probe_default(void)
75 static struct apic apic_default = {
78 .probe = probe_default,
79 .acpi_madt_oem_check = NULL,
80 .apic_id_valid = default_apic_id_valid,
81 .apic_id_registered = default_apic_id_registered,
83 .irq_delivery_mode = dest_LowestPrio,
84 /* logical delivery broadcast to all CPUs: */
87 .target_cpus = default_target_cpus,
89 .dest_logical = APIC_DEST_LOGICAL,
90 .check_apicid_used = default_check_apicid_used,
92 .vector_allocation_domain = flat_vector_allocation_domain,
93 .init_apic_ldr = default_init_apic_ldr,
95 .ioapic_phys_id_map = default_ioapic_phys_id_map,
96 .setup_apic_routing = setup_apic_flat_routing,
97 .multi_timer_check = NULL,
98 .cpu_present_to_apicid = default_cpu_present_to_apicid,
99 .apicid_to_cpu_present = physid_set_mask_of_physid,
100 .setup_portio_remap = NULL,
101 .check_phys_apicid_present = default_check_phys_apicid_present,
102 .enable_apic_mode = NULL,
103 .phys_pkg_id = default_phys_pkg_id,
105 .get_apic_id = default_get_apic_id,
107 .apic_id_mask = 0x0F << 24,
109 .cpu_mask_to_apicid_and = flat_cpu_mask_to_apicid_and,
111 .send_IPI_mask = default_send_IPI_mask_logical,
112 .send_IPI_mask_allbutself = default_send_IPI_mask_allbutself_logical,
113 .send_IPI_allbutself = default_send_IPI_allbutself,
114 .send_IPI_all = default_send_IPI_all,
115 .send_IPI_self = default_send_IPI_self,
117 .wait_for_init_deassert = true,
118 .inquire_remote_apic = default_inquire_remote_apic,
120 .read = native_apic_mem_read,
121 .write = native_apic_mem_write,
122 .eoi_write = native_apic_mem_write,
123 .icr_read = native_apic_icr_read,
124 .icr_write = native_apic_icr_write,
125 .wait_icr_idle = native_apic_wait_icr_idle,
126 .safe_wait_icr_idle = native_safe_apic_wait_icr_idle,
128 .x86_32_early_logical_apicid = default_x86_32_early_logical_apicid,
131 apic_driver(apic_default);
133 struct apic *apic = &apic_default;
134 EXPORT_SYMBOL_GPL(apic);
136 static int cmdline_apic __initdata;
137 static int __init parse_apic(char *arg)
144 for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
145 if (!strcmp((*drv)->name, arg)) {
152 /* Parsed again by __setup for debug/verbose */
155 early_param("apic", parse_apic);
157 void __init default_setup_apic_routing(void)
159 int version = apic_version[boot_cpu_physical_apicid];
161 if (num_possible_cpus() > 8) {
162 switch (boot_cpu_data.x86_vendor) {
163 case X86_VENDOR_INTEL:
164 if (!APIC_XAPIC(version)) {
168 /* If P4 and above fall through */
174 #ifdef CONFIG_X86_BIGSMP
176 * This is used to switch to bigsmp mode when
177 * - There is no apic= option specified by the user
178 * - generic_apic_probe() has chosen apic_default as the sub_arch
179 * - we find more than 8 CPUs in acpi LAPIC listing with xAPIC support
182 if (!cmdline_apic && apic == &apic_default)
183 generic_bigsmp_probe();
186 if (apic->setup_apic_routing)
187 apic->setup_apic_routing();
189 if (x86_platform.apic_post_init)
190 x86_platform.apic_post_init();
193 void __init generic_apic_probe(void)
198 for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
199 if ((*drv)->probe()) {
204 /* Not visible without early console */
205 if (drv == __apicdrivers_end)
206 panic("Didn't find an APIC driver");
208 printk(KERN_INFO "Using APIC driver %s\n", apic->name);
211 /* This function can switch the APIC even after the initial ->probe() */
212 int __init default_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
216 for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
217 if (!(*drv)->acpi_madt_oem_check)
219 if (!(*drv)->acpi_madt_oem_check(oem_id, oem_table_id))
224 printk(KERN_INFO "Switched to APIC driver `%s'.\n",