1 #ifndef __ASM_IO_APIC_H
2 #define __ASM_IO_APIC_H
4 #include <linux/types.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 */
84 __u32 __reserved_1 : 24,
90 __u32 __reserved_1 : 24,
95 __u32 __reserved_3 : 24,
99 } __attribute__ ((packed));
101 #ifdef CONFIG_X86_IO_APIC
104 * # of IO-APICs and # of IRQ routing registers
106 extern int nr_ioapics;
107 extern int nr_ioapic_registers[MAX_IO_APICS];
110 * MP-BIOS irq configuration table structures:
113 #define MP_MAX_IOAPIC_PIN 127
115 struct mp_ioapic_routing {
119 DECLARE_BITMAP(pin_programmed, MP_MAX_IOAPIC_PIN + 1);
122 /* I/O APIC entries */
123 extern struct mpc_config_ioapic mp_ioapics[MAX_IO_APICS];
125 /* # of MP IRQ source entries */
126 extern int mp_irq_entries;
128 /* MP IRQ source entries */
129 extern struct mpc_config_intsrc mp_irqs[MAX_IRQ_SOURCES];
131 /* non-0 if default (table-less) MP configuration */
132 extern int mpc_default_type;
134 /* Older SiS APIC requires we rewrite the index register */
135 extern int sis_apic_bug;
137 /* 1 if "noapic" boot option passed */
138 extern int skip_ioapic_setup;
140 static inline void disable_ioapic_setup(void)
142 skip_ioapic_setup = 1;
146 * If we use the IO-APIC for IRQ routing, disable automatic
147 * assignment of PCI IRQ's.
149 #define io_apic_assign_pci_irqs \
150 (mp_irq_entries && !skip_ioapic_setup && io_apic_irqs)
153 extern int io_apic_get_unique_id(int ioapic, int apic_id);
154 extern int io_apic_get_version(int ioapic);
155 extern int io_apic_get_redir_entries(int ioapic);
156 extern int io_apic_set_pci_routing(int ioapic, int pin, int irq,
157 int edge_level, int active_high_low);
158 #endif /* CONFIG_ACPI */
160 extern int (*ioapic_renumber_irq)(int ioapic, int irq);
161 extern void ioapic_init_mappings(void);
163 #else /* !CONFIG_X86_IO_APIC */
164 #define io_apic_assign_pci_irqs 0