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
14 /* I/O Unit Redirection Table */
15 #define IO_APIC_REDIR_VECTOR_MASK 0x000FF
16 #define IO_APIC_REDIR_DEST_LOGICAL 0x00800
17 #define IO_APIC_REDIR_DEST_PHYSICAL 0x00000
18 #define IO_APIC_REDIR_SEND_PENDING (1 << 12)
19 #define IO_APIC_REDIR_REMOTE_IRR (1 << 14)
20 #define IO_APIC_REDIR_LEVEL_TRIGGER (1 << 15)
21 #define IO_APIC_REDIR_MASKED (1 << 16)
24 * The structure of the IO-APIC:
26 union IO_APIC_reg_00 {
29 u32 __reserved_2 : 14,
34 } __attribute__ ((packed)) bits;
37 union IO_APIC_reg_01 {
45 } __attribute__ ((packed)) bits;
48 union IO_APIC_reg_02 {
51 u32 __reserved_2 : 24,
54 } __attribute__ ((packed)) bits;
57 union IO_APIC_reg_03 {
62 } __attribute__ ((packed)) bits;
65 enum ioapic_irq_destination_types {
76 struct IO_APIC_route_entry {
78 delivery_mode : 3, /* 000: FIXED
82 dest_mode : 1, /* 0: physical, 1: logical */
86 trigger : 1, /* 0: edge, 1: level */
87 mask : 1, /* 0: enabled, 1: disabled */
93 __u32 __reserved_1 : 24,
99 __u32 __reserved_1 : 24,
104 __u32 __reserved_3 : 24,
108 } __attribute__ ((packed));
110 #ifdef CONFIG_X86_IO_APIC
113 * # of IO-APICs and # of IRQ routing registers
115 extern int nr_ioapics;
116 extern int nr_ioapic_registers[MAX_IO_APICS];
119 * MP-BIOS irq configuration table structures:
122 #define MP_MAX_IOAPIC_PIN 127
124 struct mp_config_ioapic {
125 unsigned long mp_apicaddr;
126 unsigned int mp_apicid;
127 unsigned char mp_type;
128 unsigned char mp_apicver;
129 unsigned char mp_flags;
132 struct mp_config_intsrc {
133 unsigned int mp_dstapic;
134 unsigned char mp_type;
135 unsigned char mp_irqtype;
136 unsigned short mp_irqflag;
137 unsigned char mp_srcbus;
138 unsigned char mp_srcbusirq;
139 unsigned char mp_dstirq;
142 /* I/O APIC entries */
143 extern struct mp_config_ioapic mp_ioapics[MAX_IO_APICS];
145 /* # of MP IRQ source entries */
146 extern int mp_irq_entries;
148 /* MP IRQ source entries */
149 extern struct mp_config_intsrc mp_irqs[MAX_IRQ_SOURCES];
151 /* non-0 if default (table-less) MP configuration */
152 extern int mpc_default_type;
154 /* Older SiS APIC requires we rewrite the index register */
155 extern int sis_apic_bug;
157 /* 1 if "noapic" boot option passed */
158 extern int skip_ioapic_setup;
160 /* 1 if the timer IRQ uses the '8259A Virtual Wire' mode */
161 extern int timer_through_8259;
163 static inline void disable_ioapic_setup(void)
165 skip_ioapic_setup = 1;
169 * If we use the IO-APIC for IRQ routing, disable automatic
170 * assignment of PCI IRQ's.
172 #define io_apic_assign_pci_irqs \
173 (mp_irq_entries && !skip_ioapic_setup && io_apic_irqs)
176 extern int io_apic_get_unique_id(int ioapic, int apic_id);
177 extern int io_apic_get_version(int ioapic);
178 extern int io_apic_get_redir_entries(int ioapic);
179 extern int io_apic_set_pci_routing(int ioapic, int pin, int irq,
180 int edge_level, int active_high_low);
181 #endif /* CONFIG_ACPI */
183 extern int (*ioapic_renumber_irq)(int ioapic, int irq);
184 extern void ioapic_init_mappings(void);
186 #else /* !CONFIG_X86_IO_APIC */
187 #define io_apic_assign_pci_irqs 0
188 static const int timer_through_8259 = 0;
189 static inline void ioapic_init_mappings(void) { }