arch/powerpc/sysdev/xics/icp-opal.c

Source file repositories/reference/linux-study-clean/arch/powerpc/sysdev/xics/icp-opal.c

File Facts

System
Linux kernel
Corpus path
arch/powerpc/sysdev/xics/icp-opal.c
Extension
.c
Size
4441 bytes
Lines
203
Domain
Architecture Layer
Bucket
arch/powerpc
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

if (vec == XICS_IPI) {
			/* Clear pending IPI */
			int cpu = smp_processor_id();
			kvmppc_clear_host_ipi(cpu);
			opal_int_set_mfrr(get_hard_smp_processor_id(cpu), 0xff);
		} else {
			pr_err("XICS: hw interrupt 0x%x to offline cpu, "
			       "disabling\n", vec);
			xics_mask_unknown_vec(vec);
		}

		/* EOI the interrupt */
	} while (opal_int_eoi(xirr) > 0);
}

#endif /* CONFIG_SMP */

static const struct icp_ops icp_opal_ops = {
	.get_irq	= icp_opal_get_irq,
	.eoi		= icp_opal_eoi,
	.set_priority	= icp_opal_set_cpu_priority,
	.teardown_cpu	= icp_opal_teardown_cpu,
	.flush_ipi	= icp_opal_flush_ipi,
#ifdef CONFIG_SMP
	.ipi_action	= icp_opal_ipi_action,
	.cause_ipi	= icp_opal_cause_ipi,
#endif
};

int __init icp_opal_init(void)
{
	struct device_node *np;

	np = of_find_compatible_node(NULL, NULL, "ibm,opal-intc");
	if (!np)
		return -ENODEV;

	icp_ops = &icp_opal_ops;

	printk("XICS: Using OPAL ICP fallbacks\n");

	of_node_put(np);
	return 0;
}

Annotation

Implementation Notes