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
15 * The structure of the IO-APIC:
17 union IO_APIC_reg_00 {
20 u32 __reserved_2 : 14,
25 } __attribute__ ((packed)) bits;
28 union IO_APIC_reg_01 {
36 } __attribute__ ((packed)) bits;
39 union IO_APIC_reg_02 {
42 u32 __reserved_2 : 24,
45 } __attribute__ ((packed)) bits;
48 union IO_APIC_reg_03 {
53 } __attribute__ ((packed)) bits;
56 enum ioapic_irq_destination_types {
67 struct IO_APIC_route_entry {
69 delivery_mode : 3, /* 000: FIXED
73 dest_mode : 1, /* 0: physical, 1: logical */
77 trigger : 1, /* 0: edge, 1: level */
78 mask : 1, /* 0: enabled, 1: disabled */
81 union { struct { __u32
93 } __attribute__ ((packed));
95 #ifdef CONFIG_X86_IO_APIC
98 * # of IO-APICs and # of IRQ routing registers
100 extern int nr_ioapics;
101 extern int nr_ioapic_registers[MAX_IO_APICS];
104 * MP-BIOS irq configuration table structures:
107 /* I/O APIC entries */
108 extern struct mpc_config_ioapic mp_ioapics[MAX_IO_APICS];
110 /* # of MP IRQ source entries */
111 extern int mp_irq_entries;
113 /* MP IRQ source entries */
114 extern struct mpc_config_intsrc mp_irqs[MAX_IRQ_SOURCES];
116 /* non-0 if default (table-less) MP configuration */
117 extern int mpc_default_type;
119 /* Older SiS APIC requires we rewrite the index register */
120 extern int sis_apic_bug;
122 /* 1 if "noapic" boot option passed */
123 extern int skip_ioapic_setup;
125 static inline void disable_ioapic_setup(void)
127 skip_ioapic_setup = 1;
130 static inline int ioapic_setup_disabled(void)
132 return skip_ioapic_setup;
136 * If we use the IO-APIC for IRQ routing, disable automatic
137 * assignment of PCI IRQ's.
139 #define io_apic_assign_pci_irqs (mp_irq_entries && !skip_ioapic_setup && io_apic_irqs)
142 extern int io_apic_get_unique_id (int ioapic, int apic_id);
143 extern int io_apic_get_version (int ioapic);
144 extern int io_apic_get_redir_entries (int ioapic);
145 extern int io_apic_set_pci_routing (int ioapic, int pin, int irq, int edge_level, int active_high_low);
146 extern int timer_uses_ioapic_pin_0;
147 #endif /* CONFIG_ACPI */
149 extern int (*ioapic_renumber_irq)(int ioapic, int irq);
151 #else /* !CONFIG_X86_IO_APIC */
152 #define io_apic_assign_pci_irqs 0