hw_irq.h

讲述linux的初始化过程

#ifndef _ASM_IA64_HW_IRQ_H
#define _ASM_IA64_HW_IRQ_H

/*
 * Copyright (C) 2000 Hewlett-Packard Co
 * Copyright (C) 2000 David Mosberger-Tang <[e-mail]>
 */

#include <linux/sched.h>
#include <linux/types.h>

#include <asm/machvec.h>
#include <asm/ptrace.h>
#include <asm/smp.h>

/*
 * 0 special
 *
 * 1,3-14 are reserved from firmware
 *
 * 16-255 (vectored external interrupts) are available
 *
 * 15 spurious interrupt (see IVR)
 *
 * 16 lowest priority, 255 highest priority
 *
 * 15 classes of 16 interrupts each.
 */
#define IA64_MIN_VECTORED_IRQ	 16
#define IA64_MAX_VECTORED_IRQ	255

#define IA64_SPURIOUS_INT	0x0f

/*
 * Vectors 0x10-0x1f are used for low priority interrupts, e.g. CMCI.
 */
#define PCE_IRQ			0x1e	/* platform corrected error interrupt vector */
#define CMC_IRQ			0x1f	/* correctable machine-check interrupt vector */
/*
 * Vectors 0x20-0x2f are reserved for legacy ISA IRQs.
 */
#define FIRST_DEVICE_IRQ	0x30
#define LAST_DEVICE_IRQ		0xe7

#define MCA_RENDEZ_IRQ		0xe8	/* MCA rendez interrupt */
#define PERFMON_IRQ		0xee	/* performanc monitor interrupt vector */
#define TIMER_IRQ		0xef	/* use highest-prio group 15 interrupt for timer */
#define	MCA_WAKEUP_IRQ		0xf0	/* MCA wakeup interrupt (must be higher than MCA_RENDEZ_IRQ) */
#define IPI_IRQ			0xfe	/* inter-processor interrupt vector */

/* IA64 inter-cpu interrupt related definitions */

#define IPI_DEFAULT_BASE_ADDR	0xfee00000

/* Delivery modes for inter-cpu interrupts */
enum {
        IA64_IPI_DM_INT =       0x0,    /* pend an external interrupt */
        IA64_IPI_DM_PMI =       0x2,    /* pend a PMI */
        IA64_IPI_DM_NMI =       0x4,    /* pend an NMI (vector 2) */
        IA64_IPI_DM_INIT =      0x5,    /* pend an INIT interrupt */
        IA64_IPI_DM_EXTINT =    0x7,    /* pend an 8259-compatible interrupt. */
};

#define IA64_BUS_ID(cpu)        (cpu >> 8)
#define IA64_LOCAL_ID(cpu)      (cpu & 0xff)

extern __u8 isa_irq_to_vector_map[16];
#define isa_irq_to_vector(x)	isa_irq_to_vector_map[(x)]

extern unsigned long ipi_base_addr;

extern struct hw_interrupt_type irq_type_ia64_sapic;	/* CPU-internal interrupt controller */

extern int ia64_alloc_irq (void);	/* allocate a free irq */
extern void ia64_send_ipi (int cpu, int vector, int delivery_mode, int redirect);

static inline void
hw_resend_irq (struct hw_interrupt_type *h, unsigned int vector)
{
	platform_send_ipi(smp_processor_id(), vector, IA64_IPI_DM_INT, 0);
}

#endif /* _ASM_IA64_HW_IRQ_H */