arch/powerpc/include/asm/irq.h

File Facts

System

Linux kernel

Corpus path

arch/powerpc/include/asm/irq.h

Extension

.h

Size

1359 bytes

Lines

64

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.

• CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.
• Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/threads.h
• linux/list.h
• linux/radix-tree.h
• asm/types.h
• linux/atomic.h

Detected Declarations

• struct pt_regs
• function irq_canonicalize

Annotated Snippet

#ifdef __KERNEL__
#ifndef _ASM_POWERPC_IRQ_H
#define _ASM_POWERPC_IRQ_H

/*
 */

#include <linux/threads.h>
#include <linux/list.h>
#include <linux/radix-tree.h>

#include <asm/types.h>
#include <linux/atomic.h>


extern atomic_t ppc_n_lost_interrupts;

/* Total number of virq in the platform */
#define NR_IRQS		CONFIG_NR_IRQS

/* Number of irqs reserved for a legacy isa controller */
#define NR_IRQS_LEGACY		16

extern irq_hw_number_t virq_to_hw(unsigned int virq);

static __inline__ int irq_canonicalize(int irq)
{
	return irq;
}

extern int distribute_irqs;

struct pt_regs;

#ifdef CONFIG_BOOKE
/*
 * Per-cpu stacks for handling critical, debug and machine check
 * level interrupts.
 */
extern void *critirq_ctx[NR_CPUS];
extern void *dbgirq_ctx[NR_CPUS];
extern void *mcheckirq_ctx[NR_CPUS];
#endif

/*
 * Per-cpu stacks for handling hard and soft interrupts.
 */
extern void *hardirq_ctx[NR_CPUS];
extern void *softirq_ctx[NR_CPUS];

void __do_IRQ(struct pt_regs *regs);

int irq_choose_cpu(const struct cpumask *mask);

#if defined(CONFIG_PPC_BOOK3S_64) && defined(CONFIG_NMI_IPI)
extern void arch_trigger_cpumask_backtrace(const cpumask_t *mask,
					   int exclude_cpu);
#define arch_trigger_cpumask_backtrace arch_trigger_cpumask_backtrace
#endif

#endif /* _ASM_IRQ_H */
#endif /* __KERNEL__ */

Annotation

• Immediate include surface: `linux/threads.h`, `linux/list.h`, `linux/radix-tree.h`, `asm/types.h`, `linux/atomic.h`.
• Detected declarations: `struct pt_regs`, `function irq_canonicalize`.
• Atlas domain: Architecture Layer / arch/powerpc.
• Implementation status: source implementation candidate.
• Synchronization appears in or near this file; preserve lock ordering, sleepability, and interrupt-context constraints.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.