1 #ifndef __ASM_IO_APIC_H
2 #define __ASM_IO_APIC_H
5 #include <asm/mpspec.h>
8 * Intel IO-APIC support for SMP and UP systems.
10 * Copyright (C) 1997, 1998, 1999, 2000 Ingo Molnar
13 #ifdef CONFIG_X86_IO_APIC
16 * The structure of the IO-APIC:
18 union IO_APIC_reg_00 {
21 u32 __reserved_2 : 14,
26 } __attribute__ ((packed)) bits;
29 union IO_APIC_reg_01 {
37 } __attribute__ ((packed)) bits;
40 union IO_APIC_reg_02 {
43 u32 __reserved_2 : 24,
46 } __attribute__ ((packed)) bits;
49 union IO_APIC_reg_03 {
54 } __attribute__ ((packed)) bits;
58 * # of IO-APICs and # of IRQ routing registers
60 extern int nr_ioapics;
61 extern int nr_ioapic_registers[MAX_IO_APICS];
63 enum ioapic_irq_destination_types {
74 struct IO_APIC_route_entry {
76 delivery_mode : 3, /* 000: FIXED
80 dest_mode : 1, /* 0: physical, 1: logical */
84 trigger : 1, /* 0: edge, 1: level */
85 mask : 1, /* 0: enabled, 1: disabled */
88 union { struct { __u32
100 } __attribute__ ((packed));
103 * MP-BIOS irq configuration table structures:
106 /* I/O APIC entries */
107 extern struct mpc_config_ioapic mp_ioapics[MAX_IO_APICS];
109 /* # of MP IRQ source entries */
110 extern int mp_irq_entries;
112 /* MP IRQ source entries */
113 extern struct mpc_config_intsrc mp_irqs[MAX_IRQ_SOURCES];
115 /* non-0 if default (table-less) MP configuration */
116 extern int mpc_default_type;
118 /* Older SiS APIC requires we rewrite the index register */
119 extern int sis_apic_bug;
121 /* 1 if "noapic" boot option passed */
122 extern int skip_ioapic_setup;
124 static inline void disable_ioapic_setup(void)
126 skip_ioapic_setup = 1;
129 static inline int ioapic_setup_disabled(void)
131 return skip_ioapic_setup;
135 * If we use the IO-APIC for IRQ routing, disable automatic
136 * assignment of PCI IRQ's.
138 #define io_apic_assign_pci_irqs (mp_irq_entries && !skip_ioapic_setup && io_apic_irqs)
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 */
148 extern int (*ioapic_renumber_irq)(int ioapic, int irq);
150 #else /* !CONFIG_X86_IO_APIC */
151 #define io_apic_assign_pci_irqs 0
152 static inline void disable_ioapic_setup(void) { }