4 * Does almost nothing and should be substituted by a real apic driver via
7 * Though in case if apic is disabled (for some reason) we try
8 * to not uglify the caller's code and allow to call (some) apic routines
9 * like self-ipi, etc...
12 #include <linux/threads.h>
13 #include <linux/cpumask.h>
14 #include <linux/module.h>
15 #include <linux/string.h>
16 #include <linux/kernel.h>
17 #include <linux/ctype.h>
18 #include <linux/init.h>
19 #include <linux/errno.h>
20 #include <asm/fixmap.h>
21 #include <asm/mpspec.h>
22 #include <asm/apicdef.h>
24 #include <asm/setup.h>
26 #include <linux/smp.h>
29 #include <linux/interrupt.h>
33 static void noop_init_apic_ldr(void) { }
34 static void noop_send_IPI_mask(const struct cpumask *cpumask, int vector) { }
35 static void noop_send_IPI_mask_allbutself(const struct cpumask *cpumask, int vector) { }
36 static void noop_send_IPI_allbutself(int vector) { }
37 static void noop_send_IPI_all(int vector) { }
38 static void noop_send_IPI_self(int vector) { }
39 static void noop_apic_wait_icr_idle(void) { }
40 static void noop_apic_icr_write(u32 low, u32 id) { }
42 static int noop_wakeup_secondary_cpu(int apicid, unsigned long start_eip)
47 static u32 noop_safe_apic_wait_icr_idle(void)
52 static u64 noop_apic_icr_read(void)
57 static physid_mask_t noop_ioapic_phys_id_map(physid_mask_t phys_map)
62 static int noop_cpu_to_logical_apicid(int cpu)
67 static int noop_phys_pkg_id(int cpuid_apic, int index_msb)
72 static unsigned int noop_get_apic_id(unsigned long x)
77 static int noop_probe(void)
80 * NOOP apic should not ever be
81 * enabled via probe routine
86 static int noop_apic_id_registered(void)
89 * if we would be really "pedantic"
90 * we should pass read_apic_id() here
91 * but since NOOP suppose APIC ID = 0
92 * lets save a few cycles
94 return physid_isset(0, phys_cpu_present_map);
97 static const struct cpumask *noop_target_cpus(void)
100 return cpumask_of(0);
103 static unsigned long noop_check_apicid_used(physid_mask_t bitmap, int apicid)
105 return physid_isset(apicid, bitmap);
108 static unsigned long noop_check_apicid_present(int bit)
110 return physid_isset(bit, phys_cpu_present_map);
113 static void noop_vector_allocation_domain(int cpu, struct cpumask *retmask)
116 pr_warning("APIC: Vector allocated for non-BSP cpu\n");
117 cpumask_clear(retmask);
118 cpumask_set_cpu(cpu, retmask);
121 int noop_apicid_to_node(int logical_apicid)
123 /* we're always on node 0 */
127 static u32 noop_apic_read(u32 reg)
129 WARN_ON_ONCE((cpu_has_apic && !disable_apic));
133 static void noop_apic_write(u32 reg, u32 v)
135 WARN_ON_ONCE((cpu_has_apic || !disable_apic));
138 struct apic apic_noop = {
141 .acpi_madt_oem_check = NULL,
143 .apic_id_registered = noop_apic_id_registered,
145 .irq_delivery_mode = dest_LowestPrio,
146 /* logical delivery broadcast to all CPUs: */
149 .target_cpus = noop_target_cpus,
151 .dest_logical = APIC_DEST_LOGICAL,
152 .check_apicid_used = noop_check_apicid_used,
153 .check_apicid_present = noop_check_apicid_present,
155 .vector_allocation_domain = noop_vector_allocation_domain,
156 .init_apic_ldr = noop_init_apic_ldr,
158 .ioapic_phys_id_map = noop_ioapic_phys_id_map,
159 .setup_apic_routing = NULL,
160 .multi_timer_check = NULL,
161 .apicid_to_node = noop_apicid_to_node,
163 .cpu_to_logical_apicid = noop_cpu_to_logical_apicid,
164 .cpu_present_to_apicid = default_cpu_present_to_apicid,
167 .apicid_to_cpu_present = default_apicid_to_cpu_present,
169 .apicid_to_cpu_present = NULL,
172 .setup_portio_remap = NULL,
173 .check_phys_apicid_present = default_check_phys_apicid_present,
174 .enable_apic_mode = NULL,
176 .phys_pkg_id = noop_phys_pkg_id,
178 .mps_oem_check = NULL,
180 .get_apic_id = noop_get_apic_id,
182 .apic_id_mask = 0x0F << 24,
184 .cpu_mask_to_apicid = default_cpu_mask_to_apicid,
185 .cpu_mask_to_apicid_and = default_cpu_mask_to_apicid_and,
187 .send_IPI_mask = noop_send_IPI_mask,
188 .send_IPI_mask_allbutself = noop_send_IPI_mask_allbutself,
189 .send_IPI_allbutself = noop_send_IPI_allbutself,
190 .send_IPI_all = noop_send_IPI_all,
191 .send_IPI_self = noop_send_IPI_self,
193 .wakeup_secondary_cpu = noop_wakeup_secondary_cpu,
196 .trampoline_phys_low = DEFAULT_TRAMPOLINE_PHYS_LOW,
197 .trampoline_phys_high = DEFAULT_TRAMPOLINE_PHYS_HIGH,
199 .wait_for_init_deassert = NULL,
201 .smp_callin_clear_local_apic = NULL,
202 .inquire_remote_apic = NULL,
204 .read = noop_apic_read,
205 .write = noop_apic_write,
206 .icr_read = noop_apic_icr_read,
207 .icr_write = noop_apic_icr_write,
208 .wait_icr_idle = noop_apic_wait_icr_idle,
209 .safe_wait_icr_idle = noop_safe_apic_wait_icr_idle,