arch/alpha/include/asm/irq.h

Source file repositories/reference/linux-study-clean/arch/alpha/include/asm/irq.h

File Facts

System
Linux kernel
Corpus path
arch/alpha/include/asm/irq.h
Extension
.h
Size
2109 bytes
Lines
87
Domain
Architecture Layer
Bucket
arch/alpha
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

#ifndef _ALPHA_IRQ_H
#define _ALPHA_IRQ_H

/*
 *	linux/include/alpha/irq.h
 *
 *	(C) 1994 Linus Torvalds
 */

#include <linux/linkage.h>

#if   defined(CONFIG_ALPHA_GENERIC)

/* Here NR_IRQS is not exact, but rather an upper bound.  This is used
   many places throughout the kernel to size static arrays.  That's ok,
   we'll use alpha_mv.nr_irqs when we want the real thing.  */

/* When LEGACY_START_ADDRESS is selected, we leave out:
     TITAN
     WILDFIRE
     MARVEL

   This helps keep the kernel object size reasonable for the majority
   of machines.
*/

# if defined(CONFIG_ALPHA_LEGACY_START_ADDRESS)
#  define NR_IRQS      (128)           /* max is RAWHIDE/TAKARA */
# else
#  define NR_IRQS      (32768 + 16)    /* marvel - 32 pids */
# endif

#elif defined(CONFIG_ALPHA_PC164)     || \
      defined(CONFIG_ALPHA_LX164)
# define NR_IRQS	35

#elif defined(CONFIG_ALPHA_MIKASA)
# define NR_IRQS	32

#elif defined(CONFIG_ALPHA_ALCOR)     || \
      defined(CONFIG_ALPHA_MIATA)     || \
      defined(CONFIG_ALPHA_RUFFIAN)   || \
      defined(CONFIG_ALPHA_RX164)     || \
      defined(CONFIG_ALPHA_NORITAKE)
# define NR_IRQS	48

#elif defined(CONFIG_ALPHA_SABLE)     || \
      defined(CONFIG_ALPHA_SX164)
# define NR_IRQS	40

#elif defined(CONFIG_ALPHA_DP264) || \
      defined(CONFIG_ALPHA_SHARK)
# define NR_IRQS	64

#elif defined(CONFIG_ALPHA_TITAN)
#define NR_IRQS		80

#elif defined(CONFIG_ALPHA_RAWHIDE) || \
      defined(CONFIG_ALPHA_TAKARA) || \
      defined(CONFIG_ALPHA_EIGER)
# define NR_IRQS	128

#elif defined(CONFIG_ALPHA_WILDFIRE)
# define NR_IRQS	2048 /* enuff for 8 QBBs */

#elif defined(CONFIG_ALPHA_MARVEL)
# define NR_IRQS	(32768 + 16) 	/* marvel - 32 pids*/

#else /* everyone else */
# define NR_IRQS	16
#endif

static __inline__ int irq_canonicalize(int irq)
{
	/*
	 * XXX is this true for all Alpha's?  The old serial driver
	 * did it this way for years without any complaints, so....
	 */
	return ((irq == 2) ? 9 : irq);
}

struct pt_regs;
extern void (*perf_irq)(unsigned long, struct pt_regs *);

#endif /* _ALPHA_IRQ_H */

Annotation

Implementation Notes