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// SPDX-License-Identifier: GPL-2.0
/*
* 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...
*
* FIXME: Remove this gunk. The above argument which was intentionally left
* in place is silly to begin with because none of the callbacks except for
* APIC::read/write() have a WARN_ON_ONCE() in them. Sigh...
*/
#include <linux/cpumask.h>
#include <linux/thread_info.h>
#include <asm/apic.h>
#include "local.h"
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_icr_write(u32 low, u32 id) { }
static int noop_wakeup_secondary_cpu(u32 apicid, unsigned long start_eip) { return -1; }
static u64 noop_apic_icr_read(void) { return 0; }
static u32 noop_get_apic_id(u32 apicid) { return 0; }
static void noop_apic_eoi(void) { }
static u32 noop_apic_read(u32 reg)
{
WARN_ON_ONCE(boot_cpu_has(X86_FEATURE_APIC) && !apic_is_disabled);
return 0;
}
static void noop_apic_write(u32 reg, u32 val)
{
WARN_ON_ONCE(boot_cpu_has(X86_FEATURE_APIC) && !apic_is_disabled);
}
struct apic apic_noop __ro_after_init = {
.name = "noop",
.dest_mode_logical = true,
.disable_esr = 0,
.cpu_present_to_apicid = default_cpu_present_to_apicid,
.max_apic_id = 0xFE,
.get_apic_id = noop_get_apic_id,
.calc_dest_apicid = apic_flat_calc_apicid,
.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,
.read = noop_apic_read,
.write = noop_apic_write,
.eoi = noop_apic_eoi,
.icr_read = noop_apic_icr_read,
.icr_write = noop_apic_icr_write,
};
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