2 * Copyright 2004 James Cleverdon, IBM.
3 * Subject to the GNU Public License, v.2
5 * Flat APIC subarch code.
7 * Hacked for x86-64 by James Cleverdon from i386 architecture code by
8 * Martin Bligh, Andi Kleen, James Bottomley, John Stultz, and
11 #include <linux/errno.h>
12 #include <linux/threads.h>
13 #include <linux/cpumask.h>
14 #include <linux/string.h>
15 #include <linux/kernel.h>
16 #include <linux/ctype.h>
17 #include <linux/hardirq.h>
18 #include <linux/export.h>
23 #include <linux/acpi.h>
25 static struct apic apic_physflat;
26 static struct apic apic_flat;
28 struct apic __read_mostly *apic = &apic_flat;
29 EXPORT_SYMBOL_GPL(apic);
31 static int flat_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
37 * Set up the logical destination ID.
39 * Intel recommends to set DFR, LDR and TPR before enabling
40 * an APIC. See e.g. "AP-388 82489DX User's Manual" (Intel
41 * document number 292116). So here it goes...
43 void flat_init_apic_ldr(void)
46 unsigned long num, id;
48 num = smp_processor_id();
50 apic_write(APIC_DFR, APIC_DFR_FLAT);
51 val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
52 val |= SET_APIC_LOGICAL_ID(id);
53 apic_write(APIC_LDR, val);
56 static void _flat_send_IPI_mask(unsigned long mask, int vector)
60 local_irq_save(flags);
61 __default_send_IPI_dest_field(mask, vector, apic->dest_logical);
62 local_irq_restore(flags);
65 static void flat_send_IPI_mask(const struct cpumask *cpumask, int vector)
67 unsigned long mask = cpumask_bits(cpumask)[0];
69 _flat_send_IPI_mask(mask, vector);
73 flat_send_IPI_mask_allbutself(const struct cpumask *cpumask, int vector)
75 unsigned long mask = cpumask_bits(cpumask)[0];
76 int cpu = smp_processor_id();
78 if (cpu < BITS_PER_LONG)
79 clear_bit(cpu, &mask);
81 _flat_send_IPI_mask(mask, vector);
84 static void flat_send_IPI_allbutself(int vector)
86 int cpu = smp_processor_id();
87 #ifdef CONFIG_HOTPLUG_CPU
92 if (hotplug || vector == NMI_VECTOR) {
93 if (!cpumask_equal(cpu_online_mask, cpumask_of(cpu))) {
94 unsigned long mask = cpumask_bits(cpu_online_mask)[0];
96 if (cpu < BITS_PER_LONG)
97 clear_bit(cpu, &mask);
99 _flat_send_IPI_mask(mask, vector);
101 } else if (num_online_cpus() > 1) {
102 __default_send_IPI_shortcut(APIC_DEST_ALLBUT,
103 vector, apic->dest_logical);
107 static void flat_send_IPI_all(int vector)
109 if (vector == NMI_VECTOR) {
110 flat_send_IPI_mask(cpu_online_mask, vector);
112 __default_send_IPI_shortcut(APIC_DEST_ALLINC,
113 vector, apic->dest_logical);
117 static unsigned int flat_get_apic_id(unsigned long x)
121 id = (((x)>>24) & 0xFFu);
126 static unsigned long set_apic_id(unsigned int id)
130 x = ((id & 0xFFu)<<24);
134 static unsigned int read_xapic_id(void)
138 id = flat_get_apic_id(apic_read(APIC_ID));
142 static int flat_apic_id_registered(void)
144 return physid_isset(read_xapic_id(), phys_cpu_present_map);
147 static int flat_phys_pkg_id(int initial_apic_id, int index_msb)
149 return initial_apic_id >> index_msb;
152 static int flat_probe(void)
157 static struct apic apic_flat = {
160 .acpi_madt_oem_check = flat_acpi_madt_oem_check,
161 .apic_id_valid = default_apic_id_valid,
162 .apic_id_registered = flat_apic_id_registered,
164 .irq_delivery_mode = dest_LowestPrio,
165 .irq_dest_mode = 1, /* logical */
167 .target_cpus = online_target_cpus,
169 .dest_logical = APIC_DEST_LOGICAL,
170 .check_apicid_used = NULL,
172 .vector_allocation_domain = flat_vector_allocation_domain,
173 .init_apic_ldr = flat_init_apic_ldr,
175 .ioapic_phys_id_map = NULL,
176 .setup_apic_routing = NULL,
177 .cpu_present_to_apicid = default_cpu_present_to_apicid,
178 .apicid_to_cpu_present = NULL,
179 .check_phys_apicid_present = default_check_phys_apicid_present,
180 .phys_pkg_id = flat_phys_pkg_id,
182 .get_apic_id = flat_get_apic_id,
183 .set_apic_id = set_apic_id,
185 .cpu_mask_to_apicid_and = flat_cpu_mask_to_apicid_and,
187 .send_IPI = default_send_IPI_single,
188 .send_IPI_mask = flat_send_IPI_mask,
189 .send_IPI_mask_allbutself = flat_send_IPI_mask_allbutself,
190 .send_IPI_allbutself = flat_send_IPI_allbutself,
191 .send_IPI_all = flat_send_IPI_all,
192 .send_IPI_self = apic_send_IPI_self,
194 .inquire_remote_apic = default_inquire_remote_apic,
196 .read = native_apic_mem_read,
197 .write = native_apic_mem_write,
198 .eoi_write = native_apic_mem_write,
199 .icr_read = native_apic_icr_read,
200 .icr_write = native_apic_icr_write,
201 .wait_icr_idle = native_apic_wait_icr_idle,
202 .safe_wait_icr_idle = native_safe_apic_wait_icr_idle,
206 * Physflat mode is used when there are more than 8 CPUs on a system.
207 * We cannot use logical delivery in this case because the mask
208 * overflows, so use physical mode.
210 static int physflat_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
214 * Quirk: some x86_64 machines can only use physical APIC mode
215 * regardless of how many processors are present (x86_64 ES7000
218 if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID &&
219 (acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL)) {
220 printk(KERN_DEBUG "system APIC only can use physical flat");
224 if (!strncmp(oem_id, "IBM", 3) && !strncmp(oem_table_id, "EXA", 3)) {
225 printk(KERN_DEBUG "IBM Summit detected, will use apic physical");
233 static void physflat_send_IPI_allbutself(int vector)
235 default_send_IPI_mask_allbutself_phys(cpu_online_mask, vector);
238 static void physflat_send_IPI_all(int vector)
240 default_send_IPI_mask_sequence_phys(cpu_online_mask, vector);
243 static int physflat_probe(void)
245 if (apic == &apic_physflat || num_possible_cpus() > 8)
251 static struct apic apic_physflat = {
253 .name = "physical flat",
254 .probe = physflat_probe,
255 .acpi_madt_oem_check = physflat_acpi_madt_oem_check,
256 .apic_id_valid = default_apic_id_valid,
257 .apic_id_registered = flat_apic_id_registered,
259 .irq_delivery_mode = dest_Fixed,
260 .irq_dest_mode = 0, /* physical */
262 .target_cpus = online_target_cpus,
265 .check_apicid_used = NULL,
267 .vector_allocation_domain = default_vector_allocation_domain,
268 /* not needed, but shouldn't hurt: */
269 .init_apic_ldr = flat_init_apic_ldr,
271 .ioapic_phys_id_map = NULL,
272 .setup_apic_routing = NULL,
273 .cpu_present_to_apicid = default_cpu_present_to_apicid,
274 .apicid_to_cpu_present = NULL,
275 .check_phys_apicid_present = default_check_phys_apicid_present,
276 .phys_pkg_id = flat_phys_pkg_id,
278 .get_apic_id = flat_get_apic_id,
279 .set_apic_id = set_apic_id,
281 .cpu_mask_to_apicid_and = default_cpu_mask_to_apicid_and,
283 .send_IPI = default_send_IPI_single_phys,
284 .send_IPI_mask = default_send_IPI_mask_sequence_phys,
285 .send_IPI_mask_allbutself = default_send_IPI_mask_allbutself_phys,
286 .send_IPI_allbutself = physflat_send_IPI_allbutself,
287 .send_IPI_all = physflat_send_IPI_all,
288 .send_IPI_self = apic_send_IPI_self,
290 .inquire_remote_apic = default_inquire_remote_apic,
292 .read = native_apic_mem_read,
293 .write = native_apic_mem_write,
294 .eoi_write = native_apic_mem_write,
295 .icr_read = native_apic_icr_read,
296 .icr_write = native_apic_icr_write,
297 .wait_icr_idle = native_apic_wait_icr_idle,
298 .safe_wait_icr_idle = native_safe_apic_wait_icr_idle,
302 * We need to check for physflat first, so this order is important.
304 apic_drivers(apic_physflat, apic_flat);