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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2003 John Baldwin <jhb@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#ifndef __MACHINE_INTR_MACHDEP_H__
#define __MACHINE_INTR_MACHDEP_H__
#ifdef _KERNEL
/*
* The maximum number of I/O interrupts we allow. This number is rather
* arbitrary as it is just the maximum IRQ resource value. The interrupt
* source for a given IRQ maps that I/O interrupt to device interrupt
* source whether it be a pin on an interrupt controller or an MSI interrupt.
* The 16 ISA IRQs are assigned fixed IDT vectors, but all other device
* interrupts allocate IDT vectors on demand. Currently we have 191 IDT
* vectors available for device interrupts. On many systems with I/O APICs,
* a lot of the IRQs are not used, so this number can be much larger than
* 191 and still be safe since only interrupt sources in actual use will
* allocate IDT vectors.
*
* The first 255 IRQs (0 - 254) are reserved for ISA IRQs and PCI intline IRQs.
* IRQ values from 256 to 767 are used by MSI. When running under the Xen
* Hypervisor, IRQ values from 768 to 4863 are available for binding to
* event channel events. We leave 255 unused to avoid confusion since 255 is
* used in PCI to indicate an invalid IRQ.
*/
#define NUM_MSI_INTS 512
#define FIRST_MSI_INT 256
#ifdef XENHVM
#include <xen/xen-os.h>
#include <xen/interface/event_channel.h>
#define NUM_EVTCHN_INTS NR_EVENT_CHANNELS
#define FIRST_EVTCHN_INT \
(FIRST_MSI_INT + NUM_MSI_INTS)
#define LAST_EVTCHN_INT \
(FIRST_EVTCHN_INT + NUM_EVTCHN_INTS - 1)
#else /* !XENHVM */
#define NUM_EVTCHN_INTS 0
#endif
#define NUM_IO_INTS (FIRST_MSI_INT + NUM_MSI_INTS + NUM_EVTCHN_INTS)
/*
* Default base address for MSI messages on x86 platforms.
*/
#define MSI_INTEL_ADDR_BASE 0xfee00000
/*
* - 1 ??? dummy counter.
* - 2 counters for each I/O interrupt.
* - 1 counter for each CPU for lapic timer.
* - 9 counters for each CPU for IPI counters for SMP.
*/
#ifdef SMP
#define INTRCNT_COUNT (1 + NUM_IO_INTS * 2 + (1 + 9) * MAXCPU)
#else
#define INTRCNT_COUNT (1 + NUM_IO_INTS * 2 + 1)
#endif
#ifndef LOCORE
typedef void inthand_t(void);
#define IDTVEC(name) __CONCAT(X,name)
struct intsrc;
/*
* Methods that a PIC provides to mask/unmask a given interrupt source,
* "turn on" the interrupt on the CPU side by setting up an IDT entry, and
* return the vector associated with this source.
*/
struct pic {
void (*pic_enable_source)(struct intsrc *);
void (*pic_disable_source)(struct intsrc *, int);
void (*pic_eoi_source)(struct intsrc *);
void (*pic_enable_intr)(struct intsrc *);
void (*pic_disable_intr)(struct intsrc *);
int (*pic_vector)(struct intsrc *);
int (*pic_source_pending)(struct intsrc *);
void (*pic_suspend)(struct pic *);
void (*pic_resume)(struct pic *, bool suspend_cancelled);
int (*pic_config_intr)(struct intsrc *, enum intr_trigger,
enum intr_polarity);
int (*pic_assign_cpu)(struct intsrc *, u_int apic_id);
void (*pic_reprogram_pin)(struct intsrc *);
TAILQ_ENTRY(pic) pics;
};
/* Flags for pic_disable_source() */
enum {
PIC_EOI,
PIC_NO_EOI,
};
/*
* An interrupt source. The upper-layer code uses the PIC methods to
* control a given source. The lower-layer PIC drivers can store additional
* private data in a given interrupt source such as an interrupt pin number
* or an I/O APIC pointer.
*/
struct intsrc {
struct pic *is_pic;
struct intr_event *is_event;
u_long *is_count;
u_long *is_straycount;
u_int is_index;
u_int is_handlers;
u_int is_domain;
u_int is_cpu;
};
struct trapframe;
#ifdef SMP
extern cpuset_t intr_cpus;
#endif
extern struct mtx icu_lock;
extern int elcr_found;
#ifdef SMP
extern int msix_disable_migration;
#endif
#ifndef DEV_ATPIC
void atpic_reset(void);
#endif
/* XXX: The elcr_* prototypes probably belong somewhere else. */
int elcr_probe(void);
enum intr_trigger elcr_read_trigger(u_int irq);
void elcr_resume(void);
void elcr_write_trigger(u_int irq, enum intr_trigger trigger);
#ifdef SMP
void intr_add_cpu(u_int cpu);
#endif
int intr_add_handler(const char *name, int vector, driver_filter_t filter,
driver_intr_t handler, void *arg, enum intr_type flags, void **cookiep,
int domain);
#ifdef SMP
int intr_bind(u_int vector, u_char cpu);
#endif
int intr_config_intr(int vector, enum intr_trigger trig,
enum intr_polarity pol);
int intr_describe(u_int vector, void *ih, const char *descr);
void intr_execute_handlers(struct intsrc *isrc, struct trapframe *frame);
u_int intr_next_cpu(int domain);
struct intsrc *intr_lookup_source(int vector);
int intr_register_pic(struct pic *pic);
int intr_register_source(struct intsrc *isrc);
int intr_remove_handler(void *cookie);
void intr_resume(bool suspend_cancelled);
void intr_suspend(void);
void intr_reprogram(void);
void intrcnt_add(const char *name, u_long **countp);
void nexus_add_irq(u_long irq);
int msi_alloc(device_t dev, int count, int maxcount, int *irqs);
void msi_init(void);
int msi_map(int irq, uint64_t *addr, uint32_t *data);
int msi_release(int* irqs, int count);
int msix_alloc(device_t dev, int *irq);
int msix_release(int irq);
#endif /* !LOCORE */
#endif /* _KERNEL */
#endif /* !__MACHINE_INTR_MACHDEP_H__ */
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