arch/x86/entry/entry_fred.c

Source file repositories/reference/linux-study-clean/arch/x86/entry/entry_fred.c

File Facts

System
Linux kernel
Corpus path
arch/x86/entry/entry_fred.c
Extension
.c
Size
8527 bytes
Lines
301
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

likely(regs->fred_ss.vector == FRED_SYSENTER && !regs->fred_ss.l)) {
		regs->orig_ax = regs->ax;
		regs->ax = -ENOSYS;
		do_fast_syscall_32(regs);
		return;
	} else {
		exc_invalid_op(regs);
		return;
	}
}

#define SYSVEC(_vector, _function) [_vector - FIRST_SYSTEM_VECTOR] = fred_sysvec_##_function

static idtentry_t sysvec_table[NR_SYSTEM_VECTORS] __ro_after_init = {
	SYSVEC(ERROR_APIC_VECTOR,		error_interrupt),
	SYSVEC(SPURIOUS_APIC_VECTOR,		spurious_apic_interrupt),
	SYSVEC(LOCAL_TIMER_VECTOR,		apic_timer_interrupt),
	SYSVEC(X86_PLATFORM_IPI_VECTOR,		x86_platform_ipi),

	SYSVEC(RESCHEDULE_VECTOR,		reschedule_ipi),
	SYSVEC(CALL_FUNCTION_SINGLE_VECTOR,	call_function_single),
	SYSVEC(CALL_FUNCTION_VECTOR,		call_function),
	SYSVEC(REBOOT_VECTOR,			reboot),

	SYSVEC(THRESHOLD_APIC_VECTOR,		threshold),
	SYSVEC(DEFERRED_ERROR_VECTOR,		deferred_error),
	SYSVEC(THERMAL_APIC_VECTOR,		thermal),

	SYSVEC(IRQ_WORK_VECTOR,			irq_work),

	SYSVEC(PERF_GUEST_MEDIATED_PMI_VECTOR,	perf_guest_mediated_pmi_handler),
	SYSVEC(POSTED_INTR_VECTOR,		kvm_posted_intr_ipi),
	SYSVEC(POSTED_INTR_WAKEUP_VECTOR,	kvm_posted_intr_wakeup_ipi),
	SYSVEC(POSTED_INTR_NESTED_VECTOR,	kvm_posted_intr_nested_ipi),

	SYSVEC(POSTED_MSI_NOTIFICATION_VECTOR,	posted_msi_notification),
};

static bool fred_setup_done __initdata;

void __init fred_install_sysvec(unsigned int sysvec, idtentry_t handler)
{
	if (WARN_ON_ONCE(sysvec < FIRST_SYSTEM_VECTOR))
		return;

	if (WARN_ON_ONCE(fred_setup_done))
		return;

	if (!WARN_ON_ONCE(sysvec_table[sysvec - FIRST_SYSTEM_VECTOR]))
		 sysvec_table[sysvec - FIRST_SYSTEM_VECTOR] = handler;
}

static noinstr void fred_handle_spurious_interrupt(struct pt_regs *regs)
{
	spurious_interrupt(regs, regs->fred_ss.vector);
}

void __init fred_complete_exception_setup(void)
{
	unsigned int vector;

	for (vector = 0; vector < FIRST_EXTERNAL_VECTOR; vector++)
		set_bit(vector, system_vectors);

	for (vector = 0; vector < NR_SYSTEM_VECTORS; vector++) {
		if (sysvec_table[vector])
			set_bit(vector + FIRST_SYSTEM_VECTOR, system_vectors);
		else
			sysvec_table[vector] = fred_handle_spurious_interrupt;
	}
	fred_setup_done = true;
}

static noinstr void fred_extint(struct pt_regs *regs)
{
	unsigned int vector = regs->fred_ss.vector;

	if (WARN_ON_ONCE(vector < FIRST_EXTERNAL_VECTOR))
		return;

	if (likely(vector >= FIRST_SYSTEM_VECTOR)) {
		irqentry_state_t state = irqentry_enter(regs);

		instrumentation_begin();
		sysvec_table[array_index_nospec(vector - FIRST_SYSTEM_VECTOR,
						NR_SYSTEM_VECTORS)](regs);
		instrumentation_end();
		irqentry_exit(regs, state);
	} else {
		common_interrupt(regs, vector);

Annotation

Implementation Notes