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Linux/arch/x86/kernel/apic/apic_noop.c

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  1 /*
  2  * NOOP APIC driver.
  3  *
  4  * Does almost nothing and should be substituted by a real apic driver via
  5  * probe routine.
  6  *
  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...
 10  */
 11 
 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/errno.h>
 18 #include <asm/fixmap.h>
 19 #include <asm/mpspec.h>
 20 #include <asm/apicdef.h>
 21 #include <asm/apic.h>
 22 #include <asm/setup.h>
 23 
 24 #include <linux/smp.h>
 25 #include <asm/ipi.h>
 26 
 27 #include <linux/interrupt.h>
 28 #include <asm/acpi.h>
 29 #include <asm/e820.h>
 30 
 31 static void noop_init_apic_ldr(void) { }
 32 static void noop_send_IPI(int cpu, int vector) { }
 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) { }
 40 
 41 static int noop_wakeup_secondary_cpu(int apicid, unsigned long start_eip)
 42 {
 43         return -1;
 44 }
 45 
 46 static u32 noop_safe_apic_wait_icr_idle(void)
 47 {
 48         return 0;
 49 }
 50 
 51 static u64 noop_apic_icr_read(void)
 52 {
 53         return 0;
 54 }
 55 
 56 static int noop_phys_pkg_id(int cpuid_apic, int index_msb)
 57 {
 58         return 0;
 59 }
 60 
 61 static unsigned int noop_get_apic_id(unsigned long x)
 62 {
 63         return 0;
 64 }
 65 
 66 static int noop_probe(void)
 67 {
 68         /*
 69          * NOOP apic should not ever be
 70          * enabled via probe routine
 71          */
 72         return 0;
 73 }
 74 
 75 static int noop_apic_id_registered(void)
 76 {
 77         /*
 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
 82          */
 83         return physid_isset(0, phys_cpu_present_map);
 84 }
 85 
 86 static const struct cpumask *noop_target_cpus(void)
 87 {
 88         /* only BSP here */
 89         return cpumask_of(0);
 90 }
 91 
 92 static void noop_vector_allocation_domain(int cpu, struct cpumask *retmask,
 93                                           const struct cpumask *mask)
 94 {
 95         if (cpu != 0)
 96                 pr_warning("APIC: Vector allocated for non-BSP cpu\n");
 97         cpumask_copy(retmask, cpumask_of(cpu));
 98 }
 99 
100 static u32 noop_apic_read(u32 reg)
101 {
102         WARN_ON_ONCE(boot_cpu_has(X86_FEATURE_APIC) && !disable_apic);
103         return 0;
104 }
105 
106 static void noop_apic_write(u32 reg, u32 v)
107 {
108         WARN_ON_ONCE(boot_cpu_has(X86_FEATURE_APIC) && !disable_apic);
109 }
110 
111 struct apic apic_noop = {
112         .name                           = "noop",
113         .probe                          = noop_probe,
114         .acpi_madt_oem_check            = NULL,
115 
116         .apic_id_valid                  = default_apic_id_valid,
117         .apic_id_registered             = noop_apic_id_registered,
118 
119         .irq_delivery_mode              = dest_LowestPrio,
120         /* logical delivery broadcast to all CPUs: */
121         .irq_dest_mode                  = 1,
122 
123         .target_cpus                    = noop_target_cpus,
124         .disable_esr                    = 0,
125         .dest_logical                   = APIC_DEST_LOGICAL,
126         .check_apicid_used              = default_check_apicid_used,
127 
128         .vector_allocation_domain       = noop_vector_allocation_domain,
129         .init_apic_ldr                  = noop_init_apic_ldr,
130 
131         .ioapic_phys_id_map             = default_ioapic_phys_id_map,
132         .setup_apic_routing             = NULL,
133 
134         .cpu_present_to_apicid          = default_cpu_present_to_apicid,
135         .apicid_to_cpu_present          = physid_set_mask_of_physid,
136 
137         .check_phys_apicid_present      = default_check_phys_apicid_present,
138 
139         .phys_pkg_id                    = noop_phys_pkg_id,
140 
141         .get_apic_id                    = noop_get_apic_id,
142         .set_apic_id                    = NULL,
143 
144         .cpu_mask_to_apicid_and         = flat_cpu_mask_to_apicid_and,
145 
146         .send_IPI                       = noop_send_IPI,
147         .send_IPI_mask                  = noop_send_IPI_mask,
148         .send_IPI_mask_allbutself       = noop_send_IPI_mask_allbutself,
149         .send_IPI_allbutself            = noop_send_IPI_allbutself,
150         .send_IPI_all                   = noop_send_IPI_all,
151         .send_IPI_self                  = noop_send_IPI_self,
152 
153         .wakeup_secondary_cpu           = noop_wakeup_secondary_cpu,
154 
155         .inquire_remote_apic            = NULL,
156 
157         .read                           = noop_apic_read,
158         .write                          = noop_apic_write,
159         .eoi_write                      = noop_apic_write,
160         .icr_read                       = noop_apic_icr_read,
161         .icr_write                      = noop_apic_icr_write,
162         .wait_icr_idle                  = noop_apic_wait_icr_idle,
163         .safe_wait_icr_idle             = noop_safe_apic_wait_icr_idle,
164 
165 #ifdef CONFIG_X86_32
166         .x86_32_early_logical_apicid    = noop_x86_32_early_logical_apicid,
167 #endif
168 };
169 

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