diff options
Diffstat (limited to 'kernel/arch/x86/kernel/apic/apic_noop.c')
-rw-r--r-- | kernel/arch/x86/kernel/apic/apic_noop.c | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/kernel/arch/x86/kernel/apic/apic_noop.c b/kernel/arch/x86/kernel/apic/apic_noop.c new file mode 100644 index 000000000..b205cdbdb --- /dev/null +++ b/kernel/arch/x86/kernel/apic/apic_noop.c @@ -0,0 +1,169 @@ +/* + * 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/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 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((cpu_has_apic && !disable_apic)); + return 0; +} + +static void noop_apic_write(u32 reg, u32 v) +{ + WARN_ON_ONCE(cpu_has_apic && !disable_apic); +} + +struct apic apic_noop = { + .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, + .apic_id_mask = 0x0F << 24, + + .cpu_mask_to_apicid_and = flat_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, + + .wait_for_init_deassert = false, + .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 +}; |