1 #ifndef __ASM_IO_APIC_H
2 #define __ASM_IO_APIC_H
5 #include <asm/mpspec.h>
6 #include <asm/apicdef.h>
9 * Intel IO-APIC support for SMP and UP systems.
11 * Copyright (C) 1997, 1998, 1999, 2000 Ingo Molnar
14 #define APIC_MISMATCH_DEBUG
17 * The structure of the IO-APIC:
19 union IO_APIC_reg_00
{
22 u32 __reserved_2
: 14,
27 } __attribute__ ((packed
)) bits
;
30 union IO_APIC_reg_01
{
38 } __attribute__ ((packed
)) bits
;
41 union IO_APIC_reg_02
{
44 u32 __reserved_2
: 24,
47 } __attribute__ ((packed
)) bits
;
50 union IO_APIC_reg_03
{
55 } __attribute__ ((packed
)) bits
;
59 * # of IO-APICs and # of IRQ routing registers
61 extern int nr_ioapics
;
62 extern int nr_ioapic_registers
[MAX_IO_APICS
];
64 enum ioapic_irq_destination_types
{
75 struct IO_APIC_route_entry
{
77 delivery_mode
: 3, /* 000: FIXED
81 dest_mode
: 1, /* 0: physical, 1: logical */
85 trigger
: 1, /* 0: edge, 1: level */
86 mask
: 1, /* 0: enabled, 1: disabled */
89 __u32 __reserved_3
: 24,
91 } __attribute__ ((packed
));
94 * MP-BIOS irq configuration table structures:
97 /* I/O APIC entries */
98 extern struct mpc_config_ioapic mp_ioapics
[MAX_IO_APICS
];
100 /* # of MP IRQ source entries */
101 extern int mp_irq_entries
;
103 /* MP IRQ source entries */
104 extern struct mpc_config_intsrc mp_irqs
[MAX_IRQ_SOURCES
];
106 /* non-0 if default (table-less) MP configuration */
107 extern int mpc_default_type
;
109 /* 1 if "noapic" boot option passed */
110 extern int skip_ioapic_setup
;
112 static inline void disable_ioapic_setup(void)
114 skip_ioapic_setup
= 1;
119 * If we use the IO-APIC for IRQ routing, disable automatic
120 * assignment of PCI IRQ's.
122 #define io_apic_assign_pci_irqs (mp_irq_entries && !skip_ioapic_setup && io_apic_irqs)
125 extern int io_apic_get_version (int ioapic
);
126 extern int io_apic_get_redir_entries (int ioapic
);
127 extern int io_apic_set_pci_routing (int ioapic
, int pin
, int irq
, int, int);
130 extern int sis_apic_bug
; /* dummy */
132 void enable_NMI_through_LVT0 (void * dummy
);
134 extern spinlock_t i8259A_lock
;