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
15 #define IO_APIC_BASE(idx) \
16 ((volatile int *)(__fix_to_virt(FIX_IO_APIC_BASE_0 + idx) \
17 + (mp_ioapics[idx].mpc_apicaddr & ~PAGE_MASK)))
20 * The structure of the IO-APIC:
22 union IO_APIC_reg_00
{
25 u32 __reserved_2
: 14,
30 } __attribute__ ((packed
)) bits
;
33 union IO_APIC_reg_01
{
41 } __attribute__ ((packed
)) bits
;
44 union IO_APIC_reg_02
{
47 u32 __reserved_2
: 24,
50 } __attribute__ ((packed
)) bits
;
53 union IO_APIC_reg_03
{
58 } __attribute__ ((packed
)) bits
;
62 * # of IO-APICs and # of IRQ routing registers
64 extern int nr_ioapics
;
65 extern int nr_ioapic_registers
[MAX_IO_APICS
];
67 enum ioapic_irq_destination_types
{
78 struct IO_APIC_route_entry
{
80 delivery_mode
: 3, /* 000: FIXED
84 dest_mode
: 1, /* 0: physical, 1: logical */
88 trigger
: 1, /* 0: edge, 1: level */
89 mask
: 1, /* 0: enabled, 1: disabled */
92 union { struct { __u32
104 } __attribute__ ((packed
));
107 * MP-BIOS irq configuration table structures:
110 /* I/O APIC entries */
111 extern struct mpc_config_ioapic mp_ioapics
[MAX_IO_APICS
];
113 /* # of MP IRQ source entries */
114 extern int mp_irq_entries
;
116 /* MP IRQ source entries */
117 extern struct mpc_config_intsrc mp_irqs
[MAX_IRQ_SOURCES
];
119 /* non-0 if default (table-less) MP configuration */
120 extern int mpc_default_type
;
122 static inline unsigned int io_apic_read(unsigned int apic
, unsigned int reg
)
124 *IO_APIC_BASE(apic
) = reg
;
125 return *(IO_APIC_BASE(apic
)+4);
128 static inline void io_apic_write(unsigned int apic
, unsigned int reg
, unsigned int value
)
130 *IO_APIC_BASE(apic
) = reg
;
131 *(IO_APIC_BASE(apic
)+4) = value
;
135 * Re-write a value: to be used for read-modify-write
136 * cycles where the read already set up the index register.
138 * Older SiS APIC requires we rewrite the index regiser
140 extern int sis_apic_bug
;
141 static inline void io_apic_modify(unsigned int apic
, unsigned int reg
, unsigned int value
)
144 *IO_APIC_BASE(apic
) = reg
;
145 *(IO_APIC_BASE(apic
)+4) = value
;
148 /* 1 if "noapic" boot option passed */
149 extern int skip_ioapic_setup
;
151 static inline void disable_ioapic_setup(void)
153 skip_ioapic_setup
= 1;
156 static inline int ioapic_setup_disabled(void)
158 return skip_ioapic_setup
;
162 * If we use the IO-APIC for IRQ routing, disable automatic
163 * assignment of PCI IRQ's.
165 #define io_apic_assign_pci_irqs (mp_irq_entries && !skip_ioapic_setup && io_apic_irqs)
168 extern int io_apic_get_unique_id (int ioapic
, int apic_id
);
169 extern int io_apic_get_version (int ioapic
);
170 extern int io_apic_get_redir_entries (int ioapic
);
171 extern int io_apic_set_pci_routing (int ioapic
, int pin
, int irq
, int edge_level
, int active_high_low
);
172 extern int timer_uses_ioapic_pin_0
;
173 #endif /* CONFIG_ACPI */
175 extern int (*ioapic_renumber_irq
)(int ioapic
, int irq
);
177 #else /* !CONFIG_X86_IO_APIC */
178 #define io_apic_assign_pci_irqs 0
179 static inline void disable_ioapic_setup(void) { }