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/errno.h>
19 #include <asm/fixmap.h>
20 #include <asm/mpspec.h>
21 #include <asm/apicdef.h>
23 #include <asm/setup.h>
25 #include <linux/smp.h>
28 #include <linux/interrupt.h>
32 static void noop_init_apic_ldr(void) { }
33 static void noop_send_IPI_mask(const struct cpumask *cpumask, int vector) { }
34 static void noop_send_IPI_mask_allbutself(const struct cpumask *cpumask, int vector) { }
35 static void noop_send_IPI_allbutself(int vector) { }
36 static void noop_send_IPI_all(int vector) { }
37 static void noop_send_IPI_self(int vector) { }
38 static void noop_apic_wait_icr_idle(void) { }
39 static void noop_apic_icr_write(u32 low, u32 id) { }
41 static int noop_wakeup_secondary_cpu(int apicid, unsigned long start_eip)
46 static u32 noop_safe_apic_wait_icr_idle(void)
51 static u64 noop_apic_icr_read(void)
56 static int noop_phys_pkg_id(int cpuid_apic, int index_msb)
61 static unsigned int noop_get_apic_id(unsigned long x)
66 static int noop_probe(void)
69 * NOOP apic should not ever be
70 * enabled via probe routine
75 static int noop_apic_id_registered(void)
78 * if we would be really "pedantic"
79 * we should pass read_apic_id() here
80 * but since NOOP suppose APIC ID = 0
81 * lets save a few cycles
83 return physid_isset(0, phys_cpu_present_map);
86 static const struct cpumask *noop_target_cpus(void)
92 static unsigned long noop_check_apicid_used(physid_mask_t *map, int apicid)
94 return physid_isset(apicid, *map);
97 static unsigned long noop_check_apicid_present(int bit)
99 return physid_isset(bit, phys_cpu_present_map);
102 static void noop_vector_allocation_domain(int cpu, struct cpumask *retmask,
103 const struct cpumask *mask)
106 pr_warning("APIC: Vector allocated for non-BSP cpu\n");
107 cpumask_copy(retmask, cpumask_of(cpu));
110 static u32 noop_apic_read(u32 reg)
112 WARN_ON_ONCE((cpu_has_apic && !disable_apic));
116 static void noop_apic_write(u32 reg, u32 v)
118 WARN_ON_ONCE(cpu_has_apic && !disable_apic);
121 struct apic apic_noop = {
124 .acpi_madt_oem_check = NULL,
126 .apic_id_valid = default_apic_id_valid,
127 .apic_id_registered = noop_apic_id_registered,
129 .irq_delivery_mode = dest_LowestPrio,
130 /* logical delivery broadcast to all CPUs: */
133 .target_cpus = noop_target_cpus,
135 .dest_logical = APIC_DEST_LOGICAL,
136 .check_apicid_used = noop_check_apicid_used,
137 .check_apicid_present = noop_check_apicid_present,
139 .vector_allocation_domain = noop_vector_allocation_domain,
140 .init_apic_ldr = noop_init_apic_ldr,
142 .ioapic_phys_id_map = default_ioapic_phys_id_map,
143 .setup_apic_routing = NULL,
144 .multi_timer_check = NULL,
146 .cpu_present_to_apicid = default_cpu_present_to_apicid,
147 .apicid_to_cpu_present = physid_set_mask_of_physid,
149 .setup_portio_remap = NULL,
150 .check_phys_apicid_present = default_check_phys_apicid_present,
151 .enable_apic_mode = NULL,
153 .phys_pkg_id = noop_phys_pkg_id,
155 .mps_oem_check = NULL,
157 .get_apic_id = noop_get_apic_id,
159 .apic_id_mask = 0x0F << 24,
161 .cpu_mask_to_apicid_and = flat_cpu_mask_to_apicid_and,
163 .send_IPI_mask = noop_send_IPI_mask,
164 .send_IPI_mask_allbutself = noop_send_IPI_mask_allbutself,
165 .send_IPI_allbutself = noop_send_IPI_allbutself,
166 .send_IPI_all = noop_send_IPI_all,
167 .send_IPI_self = noop_send_IPI_self,
169 .wakeup_secondary_cpu = noop_wakeup_secondary_cpu,
172 .trampoline_phys_low = DEFAULT_TRAMPOLINE_PHYS_LOW,
173 .trampoline_phys_high = DEFAULT_TRAMPOLINE_PHYS_HIGH,
175 .wait_for_init_deassert = NULL,
177 .smp_callin_clear_local_apic = NULL,
178 .inquire_remote_apic = NULL,
180 .read = noop_apic_read,
181 .write = noop_apic_write,
182 .eoi_write = noop_apic_write,
183 .icr_read = noop_apic_icr_read,
184 .icr_write = noop_apic_icr_write,
185 .wait_icr_idle = noop_apic_wait_icr_idle,
186 .safe_wait_icr_idle = noop_safe_apic_wait_icr_idle,
189 .x86_32_early_logical_apicid = noop_x86_32_early_logical_apicid,