1 #ifndef __ASM_IO_APIC_H
2 #define __ASM_IO_APIC_H
4 #include <linux/config.h>
6 #include <asm/mpspec.h>
9 * Intel IO-APIC support for SMP and UP systems.
11 * Copyright (C) 1997, 1998, 1999, 2000 Ingo Molnar
14 #ifdef CONFIG_X86_IO_APIC
17 static inline int use_pci_vector(void) {return 1;}
18 static inline void disable_edge_ioapic_vector(unsigned int vector) { }
19 static inline void mask_and_ack_level_ioapic_vector(unsigned int vector) { }
20 static inline void end_edge_ioapic_vector (unsigned int vector) { }
21 #define startup_level_ioapic startup_level_ioapic_vector
22 #define shutdown_level_ioapic mask_IO_APIC_vector
23 #define enable_level_ioapic unmask_IO_APIC_vector
24 #define disable_level_ioapic mask_IO_APIC_vector
25 #define mask_and_ack_level_ioapic mask_and_ack_level_ioapic_vector
26 #define end_level_ioapic end_level_ioapic_vector
27 #define set_ioapic_affinity set_ioapic_affinity_vector
29 #define startup_edge_ioapic startup_edge_ioapic_vector
30 #define shutdown_edge_ioapic disable_edge_ioapic_vector
31 #define enable_edge_ioapic unmask_IO_APIC_vector
32 #define disable_edge_ioapic disable_edge_ioapic_vector
33 #define ack_edge_ioapic ack_edge_ioapic_vector
34 #define end_edge_ioapic end_edge_ioapic_vector
36 static inline int use_pci_vector(void) {return 0;}
37 static inline void disable_edge_ioapic_irq(unsigned int irq) { }
38 static inline void mask_and_ack_level_ioapic_irq(unsigned int irq) { }
39 static inline void end_edge_ioapic_irq (unsigned int irq) { }
40 #define startup_level_ioapic startup_level_ioapic_irq
41 #define shutdown_level_ioapic mask_IO_APIC_irq
42 #define enable_level_ioapic unmask_IO_APIC_irq
43 #define disable_level_ioapic mask_IO_APIC_irq
44 #define mask_and_ack_level_ioapic mask_and_ack_level_ioapic_irq
45 #define end_level_ioapic end_level_ioapic_irq
46 #define set_ioapic_affinity set_ioapic_affinity_irq
48 #define startup_edge_ioapic startup_edge_ioapic_irq
49 #define shutdown_edge_ioapic disable_edge_ioapic_irq
50 #define enable_edge_ioapic unmask_IO_APIC_irq
51 #define disable_edge_ioapic disable_edge_ioapic_irq
52 #define ack_edge_ioapic ack_edge_ioapic_irq
53 #define end_edge_ioapic end_edge_ioapic_irq
56 #define IO_APIC_BASE(idx) \
57 ((volatile int *)(__fix_to_virt(FIX_IO_APIC_BASE_0 + idx) \
58 + (mp_ioapics[idx].mpc_apicaddr & ~PAGE_MASK)))
61 * The structure of the IO-APIC:
63 union IO_APIC_reg_00 {
66 u32 __reserved_2 : 14,
71 } __attribute__ ((packed)) bits;
74 union IO_APIC_reg_01 {
82 } __attribute__ ((packed)) bits;
85 union IO_APIC_reg_02 {
88 u32 __reserved_2 : 24,
91 } __attribute__ ((packed)) bits;
94 union IO_APIC_reg_03 {
99 } __attribute__ ((packed)) bits;
103 * # of IO-APICs and # of IRQ routing registers
105 extern int nr_ioapics;
106 extern int nr_ioapic_registers[MAX_IO_APICS];
108 enum ioapic_irq_destination_types {
112 dest__reserved_1 = 3,
115 dest__reserved_2 = 6,
119 struct IO_APIC_route_entry {
121 delivery_mode : 3, /* 000: FIXED
125 dest_mode : 1, /* 0: physical, 1: logical */
129 trigger : 1, /* 0: edge, 1: level */
130 mask : 1, /* 0: enabled, 1: disabled */
133 union { struct { __u32
145 } __attribute__ ((packed));
148 * MP-BIOS irq configuration table structures:
151 /* I/O APIC entries */
152 extern struct mpc_config_ioapic mp_ioapics[MAX_IO_APICS];
154 /* # of MP IRQ source entries */
155 extern int mp_irq_entries;
157 /* MP IRQ source entries */
158 extern struct mpc_config_intsrc mp_irqs[MAX_IRQ_SOURCES];
160 /* non-0 if default (table-less) MP configuration */
161 extern int mpc_default_type;
163 static inline unsigned int io_apic_read(unsigned int apic, unsigned int reg)
165 *IO_APIC_BASE(apic) = reg;
166 return *(IO_APIC_BASE(apic)+4);
169 static inline void io_apic_write(unsigned int apic, unsigned int reg, unsigned int value)
171 *IO_APIC_BASE(apic) = reg;
172 *(IO_APIC_BASE(apic)+4) = value;
176 * Re-write a value: to be used for read-modify-write
177 * cycles where the read already set up the index register.
179 * Older SiS APIC requires we rewrite the index regiser
181 extern int sis_apic_bug;
182 static inline void io_apic_modify(unsigned int apic, unsigned int reg, unsigned int value)
185 *IO_APIC_BASE(apic) = reg;
186 *(IO_APIC_BASE(apic)+4) = value;
189 /* 1 if "noapic" boot option passed */
190 extern int skip_ioapic_setup;
193 * If we use the IO-APIC for IRQ routing, disable automatic
194 * assignment of PCI IRQ's.
196 #define io_apic_assign_pci_irqs (mp_irq_entries && !skip_ioapic_setup && io_apic_irqs)
199 extern int io_apic_get_unique_id (int ioapic, int apic_id);
200 extern int io_apic_get_version (int ioapic);
201 extern int io_apic_get_redir_entries (int ioapic);
202 extern int io_apic_set_pci_routing (int ioapic, int pin, int irq, int edge_level, int active_high_low);
203 #endif /* CONFIG_ACPI */
205 extern int (*ioapic_renumber_irq)(int ioapic, int irq);
207 #else /* !CONFIG_X86_IO_APIC */
208 #define io_apic_assign_pci_irqs 0
211 extern int assign_irq_vector(int irq);