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/module.h>
24 #include <acpi/acpi_bus.h>
27 static struct apic apic_physflat;
28 static struct apic apic_flat;
30 struct apic __read_mostly *apic = &apic_flat;
31 EXPORT_SYMBOL_GPL(apic);
33 static int flat_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
39 * Set up the logical destination ID.
41 * Intel recommends to set DFR, LDR and TPR before enabling
42 * an APIC. See e.g. "AP-388 82489DX User's Manual" (Intel
43 * document number 292116). So here it goes...
45 void flat_init_apic_ldr(void)
48 unsigned long num, id;
50 num = smp_processor_id();
52 apic_write(APIC_DFR, APIC_DFR_FLAT);
53 val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
54 val |= SET_APIC_LOGICAL_ID(id);
55 apic_write(APIC_LDR, val);
58 static inline void _flat_send_IPI_mask(unsigned long mask, int vector)
62 local_irq_save(flags);
63 __default_send_IPI_dest_field(mask, vector, apic->dest_logical);
64 local_irq_restore(flags);
67 static void flat_send_IPI_mask(const struct cpumask *cpumask, int vector)
69 unsigned long mask = cpumask_bits(cpumask)[0];
71 _flat_send_IPI_mask(mask, vector);
75 flat_send_IPI_mask_allbutself(const struct cpumask *cpumask, int vector)
77 unsigned long mask = cpumask_bits(cpumask)[0];
78 int cpu = smp_processor_id();
80 if (cpu < BITS_PER_LONG)
81 clear_bit(cpu, &mask);
83 _flat_send_IPI_mask(mask, vector);
86 static void flat_send_IPI_allbutself(int vector)
88 int cpu = smp_processor_id();
89 #ifdef CONFIG_HOTPLUG_CPU
94 if (hotplug || vector == NMI_VECTOR) {
95 if (!cpumask_equal(cpu_online_mask, cpumask_of(cpu))) {
96 unsigned long mask = cpumask_bits(cpu_online_mask)[0];
98 if (cpu < BITS_PER_LONG)
99 clear_bit(cpu, &mask);
101 _flat_send_IPI_mask(mask, vector);
103 } else if (num_online_cpus() > 1) {
104 __default_send_IPI_shortcut(APIC_DEST_ALLBUT,
105 vector, apic->dest_logical);
109 static void flat_send_IPI_all(int vector)
111 if (vector == NMI_VECTOR) {
112 flat_send_IPI_mask(cpu_online_mask, vector);
114 __default_send_IPI_shortcut(APIC_DEST_ALLINC,
115 vector, apic->dest_logical);
119 static unsigned int flat_get_apic_id(unsigned long x)
123 id = (((x)>>24) & 0xFFu);
128 static unsigned long set_apic_id(unsigned int id)
132 x = ((id & 0xFFu)<<24);
136 static unsigned int read_xapic_id(void)
140 id = flat_get_apic_id(apic_read(APIC_ID));
144 static int flat_apic_id_registered(void)
146 return physid_isset(read_xapic_id(), phys_cpu_present_map);
149 static int flat_phys_pkg_id(int initial_apic_id, int index_msb)
151 return initial_apic_id >> index_msb;
154 static int flat_probe(void)
159 static struct apic apic_flat = {
162 .acpi_madt_oem_check = flat_acpi_madt_oem_check,
163 .apic_id_valid = default_apic_id_valid,
164 .apic_id_registered = flat_apic_id_registered,
166 .irq_delivery_mode = dest_LowestPrio,
167 .irq_dest_mode = 1, /* logical */
169 .target_cpus = online_target_cpus,
171 .dest_logical = APIC_DEST_LOGICAL,
172 .check_apicid_used = NULL,
173 .check_apicid_present = NULL,
175 .vector_allocation_domain = flat_vector_allocation_domain,
176 .init_apic_ldr = flat_init_apic_ldr,
178 .ioapic_phys_id_map = NULL,
179 .setup_apic_routing = NULL,
180 .multi_timer_check = NULL,
181 .cpu_present_to_apicid = default_cpu_present_to_apicid,
182 .apicid_to_cpu_present = NULL,
183 .setup_portio_remap = NULL,
184 .check_phys_apicid_present = default_check_phys_apicid_present,
185 .enable_apic_mode = NULL,
186 .phys_pkg_id = flat_phys_pkg_id,
187 .mps_oem_check = NULL,
189 .get_apic_id = flat_get_apic_id,
190 .set_apic_id = set_apic_id,
191 .apic_id_mask = 0xFFu << 24,
193 .cpu_mask_to_apicid_and = flat_cpu_mask_to_apicid_and,
195 .send_IPI_mask = flat_send_IPI_mask,
196 .send_IPI_mask_allbutself = flat_send_IPI_mask_allbutself,
197 .send_IPI_allbutself = flat_send_IPI_allbutself,
198 .send_IPI_all = flat_send_IPI_all,
199 .send_IPI_self = apic_send_IPI_self,
201 .trampoline_phys_low = DEFAULT_TRAMPOLINE_PHYS_LOW,
202 .trampoline_phys_high = DEFAULT_TRAMPOLINE_PHYS_HIGH,
203 .wait_for_init_deassert = NULL,
204 .smp_callin_clear_local_apic = NULL,
205 .inquire_remote_apic = default_inquire_remote_apic,
207 .read = native_apic_mem_read,
208 .write = native_apic_mem_write,
209 .eoi_write = native_apic_mem_write,
210 .icr_read = native_apic_icr_read,
211 .icr_write = native_apic_icr_write,
212 .wait_icr_idle = native_apic_wait_icr_idle,
213 .safe_wait_icr_idle = native_safe_apic_wait_icr_idle,
217 * Physflat mode is used when there are more than 8 CPUs on a system.
218 * We cannot use logical delivery in this case because the mask
219 * overflows, so use physical mode.
221 static int physflat_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
225 * Quirk: some x86_64 machines can only use physical APIC mode
226 * regardless of how many processors are present (x86_64 ES7000
229 if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID &&
230 (acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL)) {
231 printk(KERN_DEBUG "system APIC only can use physical flat");
235 if (!strncmp(oem_id, "IBM", 3) && !strncmp(oem_table_id, "EXA", 3)) {
236 printk(KERN_DEBUG "IBM Summit detected, will use apic physical");
244 static void physflat_send_IPI_mask(const struct cpumask *cpumask, int vector)
246 default_send_IPI_mask_sequence_phys(cpumask, vector);
249 static void physflat_send_IPI_mask_allbutself(const struct cpumask *cpumask,
252 default_send_IPI_mask_allbutself_phys(cpumask, vector);
255 static void physflat_send_IPI_allbutself(int vector)
257 default_send_IPI_mask_allbutself_phys(cpu_online_mask, vector);
260 static void physflat_send_IPI_all(int vector)
262 physflat_send_IPI_mask(cpu_online_mask, vector);
265 static int physflat_probe(void)
267 if (apic == &apic_physflat || num_possible_cpus() > 8)
273 static struct apic apic_physflat = {
275 .name = "physical flat",
276 .probe = physflat_probe,
277 .acpi_madt_oem_check = physflat_acpi_madt_oem_check,
278 .apic_id_valid = default_apic_id_valid,
279 .apic_id_registered = flat_apic_id_registered,
281 .irq_delivery_mode = dest_Fixed,
282 .irq_dest_mode = 0, /* physical */
284 .target_cpus = online_target_cpus,
287 .check_apicid_used = NULL,
288 .check_apicid_present = NULL,
290 .vector_allocation_domain = default_vector_allocation_domain,
291 /* not needed, but shouldn't hurt: */
292 .init_apic_ldr = flat_init_apic_ldr,
294 .ioapic_phys_id_map = NULL,
295 .setup_apic_routing = NULL,
296 .multi_timer_check = NULL,
297 .cpu_present_to_apicid = default_cpu_present_to_apicid,
298 .apicid_to_cpu_present = NULL,
299 .setup_portio_remap = NULL,
300 .check_phys_apicid_present = default_check_phys_apicid_present,
301 .enable_apic_mode = NULL,
302 .phys_pkg_id = flat_phys_pkg_id,
303 .mps_oem_check = NULL,
305 .get_apic_id = flat_get_apic_id,
306 .set_apic_id = set_apic_id,
307 .apic_id_mask = 0xFFu << 24,
309 .cpu_mask_to_apicid_and = default_cpu_mask_to_apicid_and,
311 .send_IPI_mask = physflat_send_IPI_mask,
312 .send_IPI_mask_allbutself = physflat_send_IPI_mask_allbutself,
313 .send_IPI_allbutself = physflat_send_IPI_allbutself,
314 .send_IPI_all = physflat_send_IPI_all,
315 .send_IPI_self = apic_send_IPI_self,
317 .trampoline_phys_low = DEFAULT_TRAMPOLINE_PHYS_LOW,
318 .trampoline_phys_high = DEFAULT_TRAMPOLINE_PHYS_HIGH,
319 .wait_for_init_deassert = NULL,
320 .smp_callin_clear_local_apic = NULL,
321 .inquire_remote_apic = default_inquire_remote_apic,
323 .read = native_apic_mem_read,
324 .write = native_apic_mem_write,
325 .eoi_write = native_apic_mem_write,
326 .icr_read = native_apic_icr_read,
327 .icr_write = native_apic_icr_write,
328 .wait_icr_idle = native_apic_wait_icr_idle,
329 .safe_wait_icr_idle = native_safe_apic_wait_icr_idle,
333 * We need to check for physflat first, so this order is important.
335 apic_drivers(apic_physflat, apic_flat);