arch/parisc/include/asm/irq.h

File Facts

System

Linux kernel

Corpus path

arch/parisc/include/asm/irq.h

Extension

.h

Size

1171 bytes

Lines

51

Domain

Architecture Layer

Bucket

arch/parisc

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.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/cpumask.h
• asm/types.h

Detected Declarations

• struct irq_chip
• struct irq_data
• function irq_canonicalize

Annotated Snippet

#ifndef _ASM_PARISC_IRQ_H
#define _ASM_PARISC_IRQ_H

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

#define NO_IRQ		(-1)

#ifdef CONFIG_GSC
#define GSC_IRQ_BASE	16
#define GSC_IRQ_MAX	63
#define CPU_IRQ_BASE	64
#else
#define CPU_IRQ_BASE	16
#endif

#define TIMER_IRQ	(CPU_IRQ_BASE + 0)
#define	IPI_IRQ		(CPU_IRQ_BASE + 1)
#define CPU_IRQ_MAX	(CPU_IRQ_BASE + (BITS_PER_LONG - 1))

#define NR_IRQS		(CPU_IRQ_MAX + 1)

static __inline__ int irq_canonicalize(int irq)
{
	return (irq == 2) ? 9 : irq;
}

struct irq_chip;
struct irq_data;

void cpu_ack_irq(struct irq_data *d);
void cpu_eoi_irq(struct irq_data *d);

extern int txn_alloc_irq(unsigned int nbits);
extern int txn_claim_irq(int);
extern unsigned int txn_alloc_data(unsigned int);
extern unsigned long txn_alloc_addr(unsigned int);
extern unsigned long txn_affinity_addr(unsigned int irq, int cpu);

extern int cpu_claim_irq(unsigned int irq, struct irq_chip *, void *);
extern int cpu_check_affinity(struct irq_data *d, const struct cpumask *dest);

#endif	/* _ASM_PARISC_IRQ_H */

Annotation

• Immediate include surface: `linux/cpumask.h`, `asm/types.h`.
• Detected declarations: `struct irq_chip`, `struct irq_data`, `function irq_canonicalize`.
• Atlas domain: Architecture Layer / arch/parisc.
• Implementation status: source implementation candidate.

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.