include/asm-i386/io_apic.h

   1 #ifndef __ASM_IO_APIC_H
   2 #define __ASM_IO_APIC_H
   3
   4 #include <asm/types.h>
   5 #include <asm/mpspec.h>
   6
   7 /*
   8  * Intel IO-APIC support for SMP and UP systems.
   9  *
  10  * Copyright (C) 1997, 1998, 1999, 2000 Ingo Molnar
  11  */
  12
  13 #ifdef CONFIG_X86_IO_APIC
  14
  15 /*
  16  * The structure of the IO-APIC:
  17  */
  18 union IO_APIC_reg_00 {
  19         u32     raw;
  20         struct {
  21                 u32     __reserved_2    : 14,
  22                         LTS             :  1,
  23                         delivery_type   :  1,
  24                         __reserved_1    :  8,
  25                         ID              :  8;
  26         } __attribute__ ((packed)) bits;
  27 };
  28
  29 union IO_APIC_reg_01 {
  30         u32     raw;
  31         struct {
  32                 u32     version         :  8,
  33                         __reserved_2    :  7,
  34                         PRQ             :  1,
  35                         entries         :  8,
  36                         __reserved_1    :  8;
  37         } __attribute__ ((packed)) bits;
  38 };
  39
  40 union IO_APIC_reg_02 {
  41         u32     raw;
  42         struct {
  43                 u32     __reserved_2    : 24,
  44                         arbitration     :  4,
  45                         __reserved_1    :  4;
  46         } __attribute__ ((packed)) bits;
  47 };
  48
  49 union IO_APIC_reg_03 {
  50         u32     raw;
  51         struct {
  52                 u32     boot_DT         :  1,
  53                         __reserved_1    : 31;
  54         } __attribute__ ((packed)) bits;
  55 };
  56
  57 /*
  58  * # of IO-APICs and # of IRQ routing registers
  59  */
  60 extern int nr_ioapics;
  61 extern int nr_ioapic_registers[MAX_IO_APICS];
  62
  63 enum ioapic_irq_destination_types {
  64         dest_Fixed = 0,
  65         dest_LowestPrio = 1,
  66         dest_SMI = 2,
  67         dest__reserved_1 = 3,
  68         dest_NMI = 4,
  69         dest_INIT = 5,
  70         dest__reserved_2 = 6,
  71         dest_ExtINT = 7
  72 };
  73
  74 struct IO_APIC_route_entry {
  75         __u32   vector          :  8,
  76                 delivery_mode   :  3,   /* 000: FIXED
  77                                          * 001: lowest prio
  78                                          * 111: ExtINT
  79                                          */
  80                 dest_mode       :  1,   /* 0: physical, 1: logical */
  81                 delivery_status :  1,
  82                 polarity        :  1,
  83                 irr             :  1,
  84                 trigger         :  1,   /* 0: edge, 1: level */
  85                 mask            :  1,   /* 0: enabled, 1: disabled */
  86                 __reserved_2    : 15;
  87
  88         union {         struct { __u32
  89                                         __reserved_1    : 24,
  90                                         physical_dest   :  4,
  91                                         __reserved_2    :  4;
  92                         } physical;
  93
  94                         struct { __u32
  95                                         __reserved_1    : 24,
  96                                         logical_dest    :  8;
  97                         } logical;
  98         } dest;
  99
 100 } __attribute__ ((packed));
 101
 102 /*
 103  * MP-BIOS irq configuration table structures:
 104  */
 105
 106 /* I/O APIC entries */
 107 extern struct mpc_config_ioapic mp_ioapics[MAX_IO_APICS];
 108
 109 /* # of MP IRQ source entries */
 110 extern int mp_irq_entries;
 111
 112 /* MP IRQ source entries */
 113 extern struct mpc_config_intsrc mp_irqs[MAX_IRQ_SOURCES];
 114
 115 /* non-0 if default (table-less) MP configuration */
 116 extern int mpc_default_type;
 117
 118 /* Older SiS APIC requires we rewrite the index register */
 119 extern int sis_apic_bug;
 120
 121 /* 1 if "noapic" boot option passed */
 122 extern int skip_ioapic_setup;
 123
 124 static inline void disable_ioapic_setup(void)
 125 {
 126         skip_ioapic_setup = 1;
 127 }
 128
 129 static inline int ioapic_setup_disabled(void)
 130 {
 131         return skip_ioapic_setup;
 132 }
 133
 134 /*
 135  * If we use the IO-APIC for IRQ routing, disable automatic
 136  * assignment of PCI IRQ's.
 137  */
 138 #define io_apic_assign_pci_irqs (mp_irq_entries && !skip_ioapic_setup && io_apic_irqs)
 139
 140 #ifdef CONFIG_ACPI
 141 extern int io_apic_get_unique_id (int ioapic, int apic_id);
 142 extern int io_apic_get_version (int ioapic);
 143 extern int io_apic_get_redir_entries (int ioapic);
 144 extern int io_apic_set_pci_routing (int ioapic, int pin, int irq, int edge_level, int active_high_low);
 145 extern int timer_uses_ioapic_pin_0;
 146 #endif /* CONFIG_ACPI */
 147
 148 extern int (*ioapic_renumber_irq)(int ioapic, int irq);
 149
 150 #else  /* !CONFIG_X86_IO_APIC */
 151 #define io_apic_assign_pci_irqs 0
 152 static inline void disable_ioapic_setup(void) { }
 153 #endif
 154
 155 #endif