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- /*
- * NOOP APIC driver.
- *
- * Does almost nothing and should be substituted by a real apic driver via
- * probe routine.
- *
- * Though in case if apic is disabled (for some reason) we try
- * to not uglify the caller's code and allow to call (some) apic routines
- * like self-ipi, etc...
- */
- #include <linux/threads.h>
- #include <linux/cpumask.h>
- #include <linux/string.h>
- #include <linux/kernel.h>
- #include <linux/ctype.h>
- #include <linux/errno.h>
- #include <asm/fixmap.h>
- #include <asm/mpspec.h>
- #include <asm/apicdef.h>
- #include <asm/apic.h>
- #include <asm/setup.h>
- #include <linux/smp.h>
- #include <asm/ipi.h>
- #include <linux/interrupt.h>
- #include <asm/acpi.h>
- #include <asm/e820.h>
- static void noop_init_apic_ldr(void) { }
- static void noop_send_IPI(int cpu, int vector) { }
- static void noop_send_IPI_mask(const struct cpumask *cpumask, int vector) { }
- static void noop_send_IPI_mask_allbutself(const struct cpumask *cpumask, int vector) { }
- static void noop_send_IPI_allbutself(int vector) { }
- static void noop_send_IPI_all(int vector) { }
- static void noop_send_IPI_self(int vector) { }
- static void noop_apic_wait_icr_idle(void) { }
- static void noop_apic_icr_write(u32 low, u32 id) { }
- static int noop_wakeup_secondary_cpu(int apicid, unsigned long start_eip)
- {
- return -1;
- }
- static u32 noop_safe_apic_wait_icr_idle(void)
- {
- return 0;
- }
- static u64 noop_apic_icr_read(void)
- {
- return 0;
- }
- static int noop_phys_pkg_id(int cpuid_apic, int index_msb)
- {
- return 0;
- }
- static unsigned int noop_get_apic_id(unsigned long x)
- {
- return 0;
- }
- static int noop_probe(void)
- {
- /*
- * NOOP apic should not ever be
- * enabled via probe routine
- */
- return 0;
- }
- static int noop_apic_id_registered(void)
- {
- /*
- * if we would be really "pedantic"
- * we should pass read_apic_id() here
- * but since NOOP suppose APIC ID = 0
- * lets save a few cycles
- */
- return physid_isset(0, phys_cpu_present_map);
- }
- static const struct cpumask *noop_target_cpus(void)
- {
- /* only BSP here */
- return cpumask_of(0);
- }
- static void noop_vector_allocation_domain(int cpu, struct cpumask *retmask,
- const struct cpumask *mask)
- {
- if (cpu != 0)
- pr_warning("APIC: Vector allocated for non-BSP cpu\n");
- cpumask_copy(retmask, cpumask_of(cpu));
- }
- static u32 noop_apic_read(u32 reg)
- {
- WARN_ON_ONCE(boot_cpu_has(X86_FEATURE_APIC) && !disable_apic);
- return 0;
- }
- static void noop_apic_write(u32 reg, u32 v)
- {
- WARN_ON_ONCE(boot_cpu_has(X86_FEATURE_APIC) && !disable_apic);
- }
- struct apic apic_noop __ro_after_init = {
- .name = "noop",
- .probe = noop_probe,
- .acpi_madt_oem_check = NULL,
- .apic_id_valid = default_apic_id_valid,
- .apic_id_registered = noop_apic_id_registered,
- .irq_delivery_mode = dest_LowestPrio,
- /* logical delivery broadcast to all CPUs: */
- .irq_dest_mode = 1,
- .target_cpus = noop_target_cpus,
- .disable_esr = 0,
- .dest_logical = APIC_DEST_LOGICAL,
- .check_apicid_used = default_check_apicid_used,
- .vector_allocation_domain = noop_vector_allocation_domain,
- .init_apic_ldr = noop_init_apic_ldr,
- .ioapic_phys_id_map = default_ioapic_phys_id_map,
- .setup_apic_routing = NULL,
- .cpu_present_to_apicid = default_cpu_present_to_apicid,
- .apicid_to_cpu_present = physid_set_mask_of_physid,
- .check_phys_apicid_present = default_check_phys_apicid_present,
- .phys_pkg_id = noop_phys_pkg_id,
- .get_apic_id = noop_get_apic_id,
- .set_apic_id = NULL,
- .cpu_mask_to_apicid_and = flat_cpu_mask_to_apicid_and,
- .send_IPI = noop_send_IPI,
- .send_IPI_mask = noop_send_IPI_mask,
- .send_IPI_mask_allbutself = noop_send_IPI_mask_allbutself,
- .send_IPI_allbutself = noop_send_IPI_allbutself,
- .send_IPI_all = noop_send_IPI_all,
- .send_IPI_self = noop_send_IPI_self,
- .wakeup_secondary_cpu = noop_wakeup_secondary_cpu,
- .inquire_remote_apic = NULL,
- .read = noop_apic_read,
- .write = noop_apic_write,
- .eoi_write = noop_apic_write,
- .icr_read = noop_apic_icr_read,
- .icr_write = noop_apic_icr_write,
- .wait_icr_idle = noop_apic_wait_icr_idle,
- .safe_wait_icr_idle = noop_safe_apic_wait_icr_idle,
- #ifdef CONFIG_X86_32
- .x86_32_early_logical_apicid = noop_x86_32_early_logical_apicid,
- #endif
- };
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