[deliverable/linux.git] / include / asm-alpha / hardirq.h

#ifndef _ALPHA_HARDIRQ_H
#define _ALPHA_HARDIRQ_H

#include <linux/config.h>
#include <linux/threads.h>
#include <linux/cache.h>


/* entry.S is sensitive to the offsets of these fields */
typedef struct {
	unsigned long __softirq_pending;
} ____cacheline_aligned irq_cpustat_t;

#include <linux/irq_cpustat.h>	/* Standard mappings for irq_cpustat_t above */

#define HARDIRQ_BITS	12

/*
 * The hardirq mask has to be large enough to have
 * space for potentially nestable IRQ sources in the system
 * to nest on a single CPU. On Alpha, interrupts are masked at the CPU
 * by IPL as well as at the system level. We only have 8 IPLs (UNIX PALcode)
 * so we really only have 8 nestable IRQs, but allow some overhead
 */
#if (1 << HARDIRQ_BITS) < 16
#error HARDIRQ_BITS is too low!
#endif

#endif /* _ALPHA_HARDIRQ_H */
Commit	Line	Data
1da177e4 LT	1	#ifndef _ALPHA_HARDIRQ_H
	2	#define _ALPHA_HARDIRQ_H
	3
	4	#include <linux/config.h>
	5	#include <linux/threads.h>
	6	#include <linux/cache.h>
	7
	8
	9	/* entry.S is sensitive to the offsets of these fields */
	10	typedef struct {
	11	unsigned long __softirq_pending;
	12	} ____cacheline_aligned irq_cpustat_t;
	13
	14	#include <linux/irq_cpustat.h> /* Standard mappings for irq_cpustat_t above */
	15
	16	#define HARDIRQ_BITS 12
	17
	18	/*
	19	* The hardirq mask has to be large enough to have
	20	* space for potentially nestable IRQ sources in the system
	21	* to nest on a single CPU. On Alpha, interrupts are masked at the CPU
	22	* by IPL as well as at the system level. We only have 8 IPLs (UNIX PALcode)
	23	* so we really only have 8 nestable IRQs, but allow some overhead
	24	*/
	25	#if (1 << HARDIRQ_BITS) < 16
	26	#error HARDIRQ_BITS is too low!
	27	#endif
	28
	29	#endif /* _ALPHA_HARDIRQ_H */