1 #ifndef _ASM_X86_IO_APIC_H
2 #define _ASM_X86_IO_APIC_H
4 #include <linux/types.h>
5 #include <asm/mpspec.h>
6 #include <asm/apicdef.h>
7 #include <asm/irq_vectors.h>
10 * Intel IO-APIC support for SMP and UP systems.
12 * Copyright (C) 1997, 1998, 1999, 2000 Ingo Molnar
15 /* I/O Unit Redirection Table */
16 #define IO_APIC_REDIR_VECTOR_MASK 0x000FF
17 #define IO_APIC_REDIR_DEST_LOGICAL 0x00800
18 #define IO_APIC_REDIR_DEST_PHYSICAL 0x00000
19 #define IO_APIC_REDIR_SEND_PENDING (1 << 12)
20 #define IO_APIC_REDIR_REMOTE_IRR (1 << 14)
21 #define IO_APIC_REDIR_LEVEL_TRIGGER (1 << 15)
22 #define IO_APIC_REDIR_MASKED (1 << 16)
25 * The structure of the IO-APIC:
27 union IO_APIC_reg_00 {
30 u32 __reserved_2 : 14,
35 } __attribute__ ((packed)) bits;
38 union IO_APIC_reg_01 {
46 } __attribute__ ((packed)) bits;
49 union IO_APIC_reg_02 {
52 u32 __reserved_2 : 24,
55 } __attribute__ ((packed)) bits;
58 union IO_APIC_reg_03 {
63 } __attribute__ ((packed)) bits;
66 enum ioapic_irq_destination_types {
77 struct IO_APIC_route_entry {
79 delivery_mode : 3, /* 000: FIXED
83 dest_mode : 1, /* 0: physical, 1: logical */
87 trigger : 1, /* 0: edge, 1: level */
88 mask : 1, /* 0: enabled, 1: disabled */
91 __u32 __reserved_3 : 24,
93 } __attribute__ ((packed));
95 struct IR_IO_APIC_route_entry {
107 } __attribute__ ((packed));
109 #ifdef CONFIG_X86_IO_APIC
112 * # of IO-APICs and # of IRQ routing registers
114 extern int nr_ioapics;
115 extern int nr_ioapic_registers[MAX_IO_APICS];
117 #define MP_MAX_IOAPIC_PIN 127
119 /* I/O APIC entries */
120 extern struct mpc_ioapic mp_ioapics[MAX_IO_APICS];
122 /* # of MP IRQ source entries */
123 extern int mp_irq_entries;
125 /* MP IRQ source entries */
126 extern struct mpc_intsrc mp_irqs[MAX_IRQ_SOURCES];
128 /* non-0 if default (table-less) MP configuration */
129 extern int mpc_default_type;
131 /* Older SiS APIC requires we rewrite the index register */
132 extern int sis_apic_bug;
134 /* 1 if "noapic" boot option passed */
135 extern int skip_ioapic_setup;
137 /* 1 if "noapic" boot option passed */
138 extern int noioapicquirk;
140 /* -1 if "noapic" boot option passed */
141 extern int noioapicreroute;
143 /* 1 if the timer IRQ uses the '8259A Virtual Wire' mode */
144 extern int timer_through_8259;
147 * If we use the IO-APIC for IRQ routing, disable automatic
148 * assignment of PCI IRQ's.
150 #define io_apic_assign_pci_irqs \
151 (mp_irq_entries && !skip_ioapic_setup && io_apic_irqs)
154 extern int io_apic_get_unique_id(int ioapic, int apic_id);
155 extern int io_apic_get_version(int ioapic);
156 extern int io_apic_get_redir_entries(int ioapic);
157 extern int io_apic_set_pci_routing(int ioapic, int pin, int irq,
158 int edge_level, int active_high_low);
159 #endif /* CONFIG_ACPI */
161 extern int (*ioapic_renumber_irq)(int ioapic, int irq);
162 extern void ioapic_init_mappings(void);
165 extern struct IO_APIC_route_entry **alloc_ioapic_entries(void);
166 extern void free_ioapic_entries(struct IO_APIC_route_entry **ioapic_entries);
167 extern int save_IO_APIC_setup(struct IO_APIC_route_entry **ioapic_entries);
168 extern void mask_IO_APIC_setup(struct IO_APIC_route_entry **ioapic_entries);
169 extern int restore_IO_APIC_setup(struct IO_APIC_route_entry **ioapic_entries);
170 extern void reinit_intr_remapped_IO_APIC(int intr_remapping,
171 struct IO_APIC_route_entry **ioapic_entries);
174 extern void probe_nr_irqs_gsi(void);
176 extern int setup_ioapic_entry(int apic, int irq,
177 struct IO_APIC_route_entry *entry,
178 unsigned int destination, int trigger,
179 int polarity, int vector, int pin);
180 extern void ioapic_write_entry(int apic, int pin,
181 struct IO_APIC_route_entry e);
182 #else /* !CONFIG_X86_IO_APIC */
183 #define io_apic_assign_pci_irqs 0
184 static const int timer_through_8259 = 0;
185 static inline void ioapic_init_mappings(void) { }
187 static inline void probe_nr_irqs_gsi(void) { }
190 #endif /* _ASM_X86_IO_APIC_H */