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apic_noop.c
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apic_noop.c
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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/module.h> #include <linux/string.h> #include <linux/kernel.h> #include <linux/ctype.h> #include <linux/init.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_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 unsigned long noop_check_apicid_used(physid_mask_t *map, int apicid) { return physid_isset(apicid, *map); } static unsigned long noop_check_apicid_present(int bit) { return physid_isset(bit, phys_cpu_present_map); } static void noop_vector_allocation_domain(int cpu, struct cpumask *retmask) { if (cpu != 0) pr_warning("APIC: Vector allocated for non-BSP cpu\n"); cpumask_clear(retmask); cpumask_set_cpu(cpu, retmask); } static u32 noop_apic_read(u32 reg) { WARN_ON_ONCE((cpu_has_apic && !disable_apic)); return 0; } static void noop_apic_write(u32 reg, u32 v) { WARN_ON_ONCE(cpu_has_apic && !disable_apic); } #ifdef CONFIG_X86_32 static int noop_x86_32_numa_cpu_node(int cpu) { /* we're always on node 0 */ return 0; } #endif struct apic apic_noop = { .name = "noop", .probe = noop_probe, .acpi_madt_oem_check = NULL, .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 = noop_check_apicid_used, .check_apicid_present = noop_check_apicid_present, .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, .multi_timer_check = NULL, .cpu_present_to_apicid = default_cpu_present_to_apicid, .apicid_to_cpu_present = physid_set_mask_of_physid, .setup_portio_remap = NULL, .check_phys_apicid_present = default_check_phys_apicid_present, .enable_apic_mode = NULL, .phys_pkg_id = noop_phys_pkg_id, .mps_oem_check = NULL, .get_apic_id = noop_get_apic_id, .set_apic_id = NULL, .apic_id_mask = 0x0F << 24, .cpu_mask_to_apicid = default_cpu_mask_to_apicid, .cpu_mask_to_apicid_and = default_cpu_mask_to_apicid_and, .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, /* should be safe */ .trampoline_phys_low = DEFAULT_TRAMPOLINE_PHYS_LOW, .trampoline_phys_high = DEFAULT_TRAMPOLINE_PHYS_HIGH, .wait_for_init_deassert = NULL, .smp_callin_clear_local_apic = NULL, .inquire_remote_apic = NULL, .read = noop_apic_read, .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, .x86_32_numa_cpu_node = noop_x86_32_numa_cpu_node, #endif };
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