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];
118 * MP-BIOS irq configuration table structures:
121 #define MP_MAX_IOAPIC_PIN 127
123 struct mp_config_ioapic {
124 unsigned long mp_apicaddr;
125 unsigned int mp_apicid;
126 unsigned char mp_type;
127 unsigned char mp_apicver;
128 unsigned char mp_flags;
131 struct mp_config_intsrc {
132 unsigned int mp_dstapic;
133 unsigned char mp_type;
134 unsigned char mp_irqtype;
135 unsigned short mp_irqflag;
136 unsigned char mp_srcbus;
137 unsigned char mp_srcbusirq;
138 unsigned char mp_dstirq;
141 /* I/O APIC entries */
142 extern struct mp_config_ioapic mp_ioapics[MAX_IO_APICS];
144 /* # of MP IRQ source entries */
145 extern int mp_irq_entries;
147 /* MP IRQ source entries */
148 extern struct mp_config_intsrc mp_irqs[MAX_IRQ_SOURCES];
150 /* non-0 if default (table-less) MP configuration */
151 extern int mpc_default_type;
153 /* Older SiS APIC requires we rewrite the index register */
154 extern int sis_apic_bug;
156 /* 1 if "noapic" boot option passed */
157 extern int skip_ioapic_setup;
159 /* 1 if the timer IRQ uses the '8259A Virtual Wire' mode */
160 extern int timer_through_8259;
162 static inline void disable_ioapic_setup(void)
164 skip_ioapic_setup = 1;
168 * If we use the IO-APIC for IRQ routing, disable automatic
169 * assignment of PCI IRQ's.
171 #define io_apic_assign_pci_irqs \
172 (mp_irq_entries && !skip_ioapic_setup && io_apic_irqs)
175 extern int io_apic_get_unique_id(int ioapic, int apic_id);
176 extern int io_apic_get_version(int ioapic);
177 extern int io_apic_get_redir_entries(int ioapic);
178 extern int io_apic_set_pci_routing(int ioapic, int pin, int irq,
179 int edge_level, int active_high_low);
180 #endif /* CONFIG_ACPI */
182 extern int (*ioapic_renumber_irq)(int ioapic, int irq);
183 extern void ioapic_init_mappings(void);
186 extern int save_mask_IO_APIC_setup(void);
187 extern void restore_IO_APIC_setup(void);
188 extern void reinit_intr_remapped_IO_APIC(int);
191 extern int probe_nr_irqs(void);
193 #else /* !CONFIG_X86_IO_APIC */
194 #define io_apic_assign_pci_irqs 0
195 static const int timer_through_8259 = 0;
196 static inline void ioapic_init_mappings(void) { }
198 static inline int probe_nr_irqs(void)
204 #endif /* ASM_X86__IO_APIC_H */