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/config.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/init.h>
21 static cpumask_t flat_target_cpus(void)
23 return cpu_online_map;
27 * Set up the logical destination ID.
29 * Intel recommends to set DFR, LDR and TPR before enabling
30 * an APIC. See e.g. "AP-388 82489DX User's Manual" (Intel
31 * document number 292116). So here it goes...
33 static void flat_init_apic_ldr(void)
36 unsigned long num, id;
38 num = smp_processor_id();
40 x86_cpu_to_log_apicid[num] = id;
41 apic_write(APIC_DFR, APIC_DFR_FLAT);
42 val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
43 val |= SET_APIC_LOGICAL_ID(id);
44 apic_write(APIC_LDR, val);
47 static void flat_send_IPI_mask(cpumask_t cpumask, int vector)
49 unsigned long mask = cpus_addr(cpumask)[0];
53 local_save_flags(flags);
62 * prepare target chip field
64 cfg = __prepare_ICR2(mask);
65 apic_write(APIC_ICR2, cfg);
70 cfg = __prepare_ICR(0, vector, APIC_DEST_LOGICAL);
73 * Send the IPI. The write to APIC_ICR fires this off.
75 apic_write(APIC_ICR, cfg);
76 local_irq_restore(flags);
79 static void flat_send_IPI_allbutself(int vector)
81 #ifndef CONFIG_HOTPLUG_CPU
82 if (((num_online_cpus()) - 1) >= 1)
83 __send_IPI_shortcut(APIC_DEST_ALLBUT, vector,APIC_DEST_LOGICAL);
85 cpumask_t allbutme = cpu_online_map;
86 int me = get_cpu(); /* Ensure we are not preempted when we clear */
87 cpu_clear(me, allbutme);
89 if (!cpus_empty(allbutme))
90 flat_send_IPI_mask(allbutme, vector);
95 static void flat_send_IPI_all(int vector)
97 __send_IPI_shortcut(APIC_DEST_ALLINC, vector, APIC_DEST_LOGICAL);
100 static int flat_apic_id_registered(void)
102 return physid_isset(GET_APIC_ID(apic_read(APIC_ID)), phys_cpu_present_map);
105 static unsigned int flat_cpu_mask_to_apicid(cpumask_t cpumask)
107 return cpus_addr(cpumask)[0] & APIC_ALL_CPUS;
110 static unsigned int phys_pkg_id(int index_msb)
115 return ((ebx >> 24) & 0xFF) >> index_msb;
118 struct genapic apic_flat = {
120 .int_delivery_mode = dest_LowestPrio,
121 .int_dest_mode = (APIC_DEST_LOGICAL != 0),
122 .int_delivery_dest = APIC_DEST_LOGICAL | APIC_DM_LOWEST,
123 .target_cpus = flat_target_cpus,
124 .apic_id_registered = flat_apic_id_registered,
125 .init_apic_ldr = flat_init_apic_ldr,
126 .send_IPI_all = flat_send_IPI_all,
127 .send_IPI_allbutself = flat_send_IPI_allbutself,
128 .send_IPI_mask = flat_send_IPI_mask,
129 .cpu_mask_to_apicid = flat_cpu_mask_to_apicid,
130 .phys_pkg_id = phys_pkg_id,
134 * Physflat mode is used when there are more than 8 CPUs on a AMD system.
135 * We cannot use logical delivery in this case because the mask
136 * overflows, so use physical mode.
139 static cpumask_t physflat_target_cpus(void)
141 return cpumask_of_cpu(0);
144 static void physflat_send_IPI_mask(cpumask_t cpumask, int vector)
146 send_IPI_mask_sequence(cpumask, vector);
149 static void physflat_send_IPI_allbutself(int vector)
151 cpumask_t allbutme = cpu_online_map;
153 cpu_clear(me, allbutme);
154 physflat_send_IPI_mask(allbutme, vector);
158 static void physflat_send_IPI_all(int vector)
160 physflat_send_IPI_mask(cpu_online_map, vector);
163 static unsigned int physflat_cpu_mask_to_apicid(cpumask_t cpumask)
168 * We're using fixed IRQ delivery, can only return one phys APIC ID.
169 * May as well be the first.
171 cpu = first_cpu(cpumask);
172 if ((unsigned)cpu < NR_CPUS)
173 return x86_cpu_to_apicid[cpu];
178 struct genapic apic_physflat = {
179 .name = "physical flat",
180 .int_delivery_mode = dest_LowestPrio,
181 .int_dest_mode = (APIC_DEST_PHYSICAL != 0),
182 .int_delivery_dest = APIC_DEST_PHYSICAL | APIC_DM_LOWEST,
183 .target_cpus = physflat_target_cpus,
184 .apic_id_registered = flat_apic_id_registered,
185 .init_apic_ldr = flat_init_apic_ldr,/*not needed, but shouldn't hurt*/
186 .send_IPI_all = physflat_send_IPI_all,
187 .send_IPI_allbutself = physflat_send_IPI_allbutself,
188 .send_IPI_mask = physflat_send_IPI_mask,
189 .cpu_mask_to_apicid = physflat_cpu_mask_to_apicid,
190 .phys_pkg_id = phys_pkg_id,