The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/i386/include/intr_machdep.h

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    1 /*-
    2  * Copyright (c) 2003 John Baldwin <jhb@FreeBSD.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  * $FreeBSD$
   27  */
   28 
   29 #ifndef __MACHINE_INTR_MACHDEP_H__
   30 #define __MACHINE_INTR_MACHDEP_H__
   31 
   32 #ifdef _KERNEL
   33 
   34 /*
   35  * The maximum number of I/O interrupts we allow.  This number is rather
   36  * arbitrary as it is just the maximum IRQ resource value.  The interrupt
   37  * source for a given IRQ maps that I/O interrupt to device interrupt
   38  * source whether it be a pin on an interrupt controller or an MSI interrupt.
   39  * The 16 ISA IRQs are assigned fixed IDT vectors, but all other device
   40  * interrupts allocate IDT vectors on demand.  Currently we have 191 IDT
   41  * vectors available for device interrupts.  On many systems with I/O APICs,
   42  * a lot of the IRQs are not used, so this number can be much larger than
   43  * 191 and still be safe since only interrupt sources in actual use will
   44  * allocate IDT vectors.
   45  *
   46  * The first 255 IRQs (0 - 254) are reserved for ISA IRQs and PCI intline IRQs.
   47  * IRQ values beyond 256 are used by MSI.  We leave 255 unused to avoid
   48  * confusion since 255 is used in PCI to indicate an invalid IRQ.
   49  */
   50 #define NUM_MSI_INTS    128
   51 #define FIRST_MSI_INT   256
   52 #define NUM_IO_INTS     (FIRST_MSI_INT + NUM_MSI_INTS)
   53 
   54 /*
   55  * Default base address for MSI messages on x86 platforms.
   56  */
   57 #define MSI_INTEL_ADDR_BASE             0xfee00000
   58 
   59 /*
   60  * - 1 ??? dummy counter.
   61  * - 2 counters for each I/O interrupt.
   62  * - 1 counter for each CPU for lapic timer.
   63  * - 7 counters for each CPU for IPI counters for SMP.
   64  */
   65 #ifdef SMP
   66 #define INTRCNT_COUNT   (1 + NUM_IO_INTS * 2 + (1 + 7) * MAXCPU)
   67 #else
   68 #define INTRCNT_COUNT   (1 + NUM_IO_INTS * 2 + 1)
   69 #endif
   70 
   71 #ifndef LOCORE
   72 
   73 typedef void inthand_t(u_int cs, u_int ef, u_int esp, u_int ss);
   74 
   75 #define IDTVEC(name)    __CONCAT(X,name)
   76 
   77 struct intsrc;
   78 
   79 /*
   80  * Methods that a PIC provides to mask/unmask a given interrupt source,
   81  * "turn on" the interrupt on the CPU side by setting up an IDT entry, and
   82  * return the vector associated with this source.
   83  */
   84 struct pic {
   85         void (*pic_enable_source)(struct intsrc *);
   86         void (*pic_disable_source)(struct intsrc *, int);
   87         void (*pic_eoi_source)(struct intsrc *);
   88         void (*pic_enable_intr)(struct intsrc *);
   89         int (*pic_vector)(struct intsrc *);
   90         int (*pic_source_pending)(struct intsrc *);
   91         void (*pic_suspend)(struct pic *);
   92         void (*pic_resume)(struct pic *);
   93         int (*pic_config_intr)(struct intsrc *, enum intr_trigger,
   94             enum intr_polarity);
   95         void (*pic_assign_cpu)(struct intsrc *, u_int apic_id);
   96         STAILQ_ENTRY(pic) pics;
   97 };
   98 
   99 /* Flags for pic_disable_source() */
  100 enum {
  101         PIC_EOI,
  102         PIC_NO_EOI,
  103 };
  104 
  105 /*
  106  * An interrupt source.  The upper-layer code uses the PIC methods to
  107  * control a given source.  The lower-layer PIC drivers can store additional
  108  * private data in a given interrupt source such as an interrupt pin number
  109  * or an I/O APIC pointer.
  110  */
  111 struct intsrc {
  112         struct pic *is_pic;
  113         struct intr_event *is_event;
  114         u_long *is_count;
  115         u_long *is_straycount;
  116         u_int is_index;
  117         u_int is_enabled:1;
  118 };
  119 
  120 struct intrframe;
  121 
  122 extern struct mtx icu_lock;
  123 extern int elcr_found;
  124 
  125 /* XXX: The elcr_* prototypes probably belong somewhere else. */
  126 int     elcr_probe(void);
  127 enum intr_trigger elcr_read_trigger(u_int irq);
  128 void    elcr_resume(void);
  129 void    elcr_write_trigger(u_int irq, enum intr_trigger trigger);
  130 #ifdef SMP
  131 void    intr_add_cpu(u_int apic_id);
  132 #else
  133 #define intr_add_cpu(apic_id)
  134 #endif
  135 int     intr_add_handler(const char *name, int vector, driver_intr_t handler,
  136     void *arg, enum intr_type flags, void **cookiep);
  137 int     intr_config_intr(int vector, enum intr_trigger trig,
  138     enum intr_polarity pol);
  139 void    intr_execute_handlers(struct intsrc *isrc, struct intrframe *iframe);
  140 struct intsrc *intr_lookup_source(int vector);
  141 int     intr_register_pic(struct pic *pic);
  142 int     intr_register_source(struct intsrc *isrc);
  143 int     intr_remove_handler(void *cookie);
  144 void    intr_resume(void);
  145 void    intr_suspend(void);
  146 void    intrcnt_add(const char *name, u_long **countp);
  147 void    nexus_add_irq(u_long irq);
  148 int     msi_alloc(device_t dev, int count, int maxcount, int *irqs);
  149 void    msi_init(void);
  150 int     msi_map(int irq, uint64_t *addr, uint32_t *data);
  151 int     msi_release(int* irqs, int count);
  152 int     msix_alloc(device_t dev, int *irq);
  153 int     msix_release(int irq);
  154 
  155 #endif  /* !LOCORE */
  156 #endif  /* _KERNEL */
  157 #endif  /* !__MACHINE_INTR_MACHDEP_H__ */

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