142 lines
3.4 KiB
C
142 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* NOOP APIC driver.
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*
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* Does almost nothing and should be substituted by a real apic driver via
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* probe routine.
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*
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* Though in case if apic is disabled (for some reason) we try
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* to not uglify the caller's code and allow to call (some) apic routines
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* like self-ipi, etc...
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*/
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#include <linux/cpumask.h>
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#include <linux/thread_info.h>
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#include <asm/apic.h>
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static void noop_init_apic_ldr(void) { }
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static void noop_send_IPI(int cpu, int vector) { }
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static void noop_send_IPI_mask(const struct cpumask *cpumask, int vector) { }
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static void noop_send_IPI_mask_allbutself(const struct cpumask *cpumask, int vector) { }
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static void noop_send_IPI_allbutself(int vector) { }
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static void noop_send_IPI_all(int vector) { }
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static void noop_send_IPI_self(int vector) { }
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static void noop_apic_wait_icr_idle(void) { }
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static void noop_apic_icr_write(u32 low, u32 id) { }
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static int noop_wakeup_secondary_cpu(int apicid, unsigned long start_eip)
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{
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return -1;
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}
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static u32 noop_safe_apic_wait_icr_idle(void)
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{
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return 0;
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}
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static u64 noop_apic_icr_read(void)
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{
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return 0;
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}
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static int noop_phys_pkg_id(int cpuid_apic, int index_msb)
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{
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return 0;
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}
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static unsigned int noop_get_apic_id(unsigned long x)
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{
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return 0;
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}
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static int noop_probe(void)
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{
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/*
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* NOOP apic should not ever be
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* enabled via probe routine
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*/
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return 0;
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}
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static int noop_apic_id_registered(void)
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{
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/*
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* if we would be really "pedantic"
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* we should pass read_apic_id() here
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* but since NOOP suppose APIC ID = 0
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* lets save a few cycles
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*/
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return physid_isset(0, phys_cpu_present_map);
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}
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static u32 noop_apic_read(u32 reg)
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{
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WARN_ON_ONCE(boot_cpu_has(X86_FEATURE_APIC) && !disable_apic);
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return 0;
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}
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static void noop_apic_write(u32 reg, u32 v)
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{
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WARN_ON_ONCE(boot_cpu_has(X86_FEATURE_APIC) && !disable_apic);
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}
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#ifdef CONFIG_X86_32
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static int noop_x86_32_early_logical_apicid(int cpu)
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{
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return BAD_APICID;
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}
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#endif
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struct apic apic_noop __ro_after_init = {
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.name = "noop",
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.probe = noop_probe,
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.acpi_madt_oem_check = NULL,
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.apic_id_valid = default_apic_id_valid,
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.apic_id_registered = noop_apic_id_registered,
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.delivery_mode = APIC_DELIVERY_MODE_FIXED,
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.dest_mode_logical = true,
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.disable_esr = 0,
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.check_apicid_used = default_check_apicid_used,
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.init_apic_ldr = noop_init_apic_ldr,
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.ioapic_phys_id_map = default_ioapic_phys_id_map,
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.setup_apic_routing = NULL,
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.cpu_present_to_apicid = default_cpu_present_to_apicid,
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.apicid_to_cpu_present = physid_set_mask_of_physid,
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.check_phys_apicid_present = default_check_phys_apicid_present,
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.phys_pkg_id = noop_phys_pkg_id,
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.get_apic_id = noop_get_apic_id,
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.set_apic_id = NULL,
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.calc_dest_apicid = apic_flat_calc_apicid,
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.send_IPI = noop_send_IPI,
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.send_IPI_mask = noop_send_IPI_mask,
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.send_IPI_mask_allbutself = noop_send_IPI_mask_allbutself,
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.send_IPI_allbutself = noop_send_IPI_allbutself,
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.send_IPI_all = noop_send_IPI_all,
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.send_IPI_self = noop_send_IPI_self,
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.wakeup_secondary_cpu = noop_wakeup_secondary_cpu,
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.inquire_remote_apic = NULL,
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.read = noop_apic_read,
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.write = noop_apic_write,
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.eoi_write = noop_apic_write,
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.icr_read = noop_apic_icr_read,
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.icr_write = noop_apic_icr_write,
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.wait_icr_idle = noop_apic_wait_icr_idle,
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.safe_wait_icr_idle = noop_safe_apic_wait_icr_idle,
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#ifdef CONFIG_X86_32
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.x86_32_early_logical_apicid = noop_x86_32_early_logical_apicid,
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#endif
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};
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