arch/x86/kernel/apic/apic_noop.c

Source file repositories/reference/linux-study-clean/arch/x86/kernel/apic/apic_noop.c

File Facts

System
Linux kernel
Corpus path
arch/x86/kernel/apic/apic_noop.c
Extension
.c
Size
2304 bytes
Lines
81
Domain
Architecture Layer
Bucket
arch/x86
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

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,
	unsigned int cpu)
{
	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,
};

Annotation

Implementation Notes